JP2024065445A - Selection method, computer program, and selection device - Google Patents

Abstract

[Problem] To provide a selection method for easily selecting a resonant frequency and a mass of a weight that can increase a generated voltage. [Solution] The selection method includes a first acquisition step (S10) for acquiring a first sensitivity function, a second acquisition step (S20) for acquiring a first mass function, a third acquisition step (S30) for acquiring a first spectrum of a physical quantity related to the displacement of the position of a vibration source device, a second calculation step (S50) for calculating a generated voltage at each of a plurality of first peak frequencies included in the first spectrum, a determination step (S60) for determining a first peak frequency that shows the largest value among the plurality of generated voltages, a third calculation step (S70) for calculating a mass of the first weight corresponding to the determined first peak frequency, and an output step (S80) for outputting the determined first peak frequency and the calculated mass of the first weight. [Selected Figure] FIG.

Description

The present invention relates to a selection method and a selection device.

Technology for converting familiar vibrations into electricity has been actively developed. One such technology is a vibration power generation device that uses a piezoelectric or magnetostrictive element. When using a vibration power generation device, the resonant frequency may be adjusted to increase the power generation efficiency of the device.

For example, Patent Document 1 discloses a vibration power generation device that generates power by the vibration of a plate having a piezoelectric element. This vibration power generation device includes the plate and a weight that is placed on the plate and that is capable of adjusting the resonant frequency of the plate. In this vibration power generation device, the mass of the weight is changed to adjust the resonant frequency of the deflection of the plate in order to increase the power generation efficiency.

JP 2015-204713 A

In recent years, vibration power generation devices have been attached to machinery such as production machines or machine tools together with temperature sensors and used to detect abnormalities in the machinery (e.g., high temperature). In this case, the vibration power generation device generates electricity when vibrated by the machinery, and is used as a power source for the sensors.

Such vibrations from mechanical devices and the like often have multiple frequency components. In such cases, it is difficult to select which of these multiple frequencies is the frequency that can increase the generated voltage of the vibration power generation device (i.e., the resonant frequency). For this reason, there is a demand for a selection method that can easily select the resonant frequency that can increase the generated voltage. Furthermore, as described above, this resonant frequency is adjusted by the mass of the weight. Therefore, there is also a demand for an easy selection of the mass of the weight that will set the resonant frequency of the vibration power generation device to a resonant frequency that can increase the generated voltage.

The present invention aims to solve the above-mentioned problems and to provide a selection method that can easily select a resonant frequency and a mass of a weight that can increase the generated voltage.

In order to achieve the above object, a selection method according to one aspect of the present invention is a selection method by a selection device for a first vibration power generation device having a first weight, the selection method including a first acquisition step of acquiring a first sensitivity function indicating the dependency of a first power generation sensitivity on a resonance frequency obtained by dividing a generated voltage when the first vibration power generation device is vibrated by a physical quantity, a second acquisition step of acquiring a first mass function indicating the dependency of the mass of the first weight on the resonance frequency, a third acquisition step of acquiring a first spectrum of the physical quantity related to the displacement of the position of a vibration source device, and a first spectrum corresponding to each of the multiple first peak frequencies included in the acquired first spectrum and the acquired first sensitivity function. The method includes a first calculation step of calculating the first power generation sensitivity, a second calculation step of calculating a generated voltage at each of the multiple first peak frequencies by multiplying each of the calculated multiple first power generation sensitivities by the physical quantity of the first peak frequency indicating the calculated first power generation sensitivity, a determination step of determining the first peak frequency indicating the largest value of the calculated multiple generated voltages, a third calculation step of calculating the mass of the first weight corresponding to the determined first peak frequency based on the determined first peak frequency and the acquired first mass function, and an output step of outputting the determined first peak frequency and the calculated mass of the first weight.

To achieve the above object, a computer program according to one aspect of the present invention causes a computer to execute the above-described selection method.

In order to achieve the above object, a selection device according to one aspect of the present invention is a selection device for a first vibration power generation device having a first weight, comprising: a first acquisition unit that acquires a first sensitivity function indicating the dependency of a first power generation sensitivity on a resonance frequency, the first sensitivity function being obtained by dividing a generated voltage when the first vibration power generation device is vibrated by a physical quantity; a second acquisition unit that acquires a first mass function indicating the dependency of the mass of the first weight on the resonance frequency; a third acquisition unit that acquires a first spectrum of the physical quantity related to the displacement of a position of a vibration source device; and a selection device that selects a first peak frequency corresponding to each of the multiple first peak frequencies based on each of the multiple first peak frequencies included in the acquired first spectrum and the acquired first sensitivity function. The device includes a first calculation unit that calculates the first power generation sensitivity, a second calculation unit that calculates a generated voltage at each of the multiple first peak frequencies by multiplying each of the calculated multiple first power generation sensitivities by the physical quantity of the first peak frequency that indicates the calculated first power generation sensitivity, a determination unit that determines the first peak frequency that indicates the largest value of the calculated multiple generated voltages, a third calculation unit that calculates the mass of the first weight corresponding to the determined first peak frequency based on the determined first peak frequency and the acquired first mass function, and an output unit that outputs the determined first peak frequency and the calculated mass of the first weight.

The present invention makes it possible to realize a selection method that allows easy selection of a resonant frequency and a mass of a weight that can increase the generated voltage.

FIG. 1 is a plan view of a first vibration power generation device according to an embodiment. FIG. 2 shows an example of a vibration source device according to an embodiment. FIG. 3 is a diagram showing the power generation sensitivity characteristic of the first vibration power generation device. FIG. 4 is a schematic diagram showing a finite element model according to the embodiment. FIG. 5 is a diagram showing a change over time in a physical quantity related to a displacement of the position of the vibration source device according to the embodiment. FIG. 6 shows a diagram in which a Fast Fourier Transform (FFT) analysis is performed on the time changes of the physical quantities shown in FIG. FIG. 7 is a block diagram illustrating a functional configuration of the selection device according to the embodiment. FIG. 8 is a flowchart of a first operation example of the selection device according to the embodiment. FIG. 9 is a diagram showing the change over time of the generated voltage when the mass of the first weight of the first vibration power generation device according to the embodiment is changed. FIG. 10 is a diagram showing a detailed table of the generated voltages shown in FIG. FIG. 11 is a side view of a second vibration power generation device according to a modified example. FIG. 12 is a diagram showing a power generation sensitivity characteristic of the first vibration power generation device and a power generation sensitivity characteristic of the second vibration power generation device. FIG. 13 is a flowchart of an operation example 2 of the selection device according to the modified example.

The following describes the embodiments in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components that are not described in an independent claim are described as optional components.

Note that each figure is a schematic diagram and is not necessarily a precise illustration. In addition, in each figure, the same reference numerals are used for substantially the same configurations, and duplicate explanations may be omitted or simplified.

In addition, in this specification and the drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. In each drawing, the x-axis direction and the y-axis direction are mutually orthogonal, and the z-axis direction is perpendicular to the x-axis and y-axis.

(Embodiment)
[Configuration of vibration power generation device]
The following describes a configuration example of a first vibration power generation device 1 according to the present embodiment. Fig. 1 is a side view of the first vibration power generation device 1 according to the present embodiment.

The first vibration power generation device 1 according to this embodiment is attached to a mechanical device (hereinafter, vibration source device 2) as described in the background art. The first vibration power generation device 1 generates electricity by vibration of the vibration source device 2, and is used as a power source for a temperature sensor, etc.

Figure 2 shows an example of a vibration source device 2 according to this embodiment. As shown in Figure 2, the vibration source device 2 is, for example, a vibrating roller, but is not limited to this. The first vibration power generation device 1 is attached to the vibrating roller and is used to detect abnormalities (e.g., high temperature conditions) of the vibrating roller.

The first vibration power generation device 1 includes a frame 21, a power generation unit 30, a connecting member 22, and a first weight 60. The power generation unit 30 includes a coil 31, a magnetostrictive element 32, and a power generation magnet 33, and is an element that generates electricity through vibration.

The frame 21 has a free end F1 and a fixed end F2. The frame 21 also has a bent portion B. The frame 21 is a member having a U-shape, and more specifically, the frame 21 has a U-shape when viewed from the side.

The frame 21 is formed by bending a single flat plate-shaped member into a U-shape. The thickness d1 of the frame 21 is, for example, 0.5 mm, but is not limited to this. The thickness d1 is approximately uniform throughout the frame 21. The overall length L1 of the frame 21 is, for example, several centimeters to several tens of centimeters, but is not limited to this.

Although not shown, the shape of the frame 21 may be a V-shaped member instead of the U-shaped member described above. In this case, the shape of the frame 21 may be V-shaped in side view. Also, the frame 21 is formed by bending a single flat plate-shaped member so that it has a V-shape.

The frame 21 is fixed and supported in a cantilever state, with one end being the fixed end F2 and the other end being the free end F1 across the bent portion B. In the first vibration power generation device 1, the fixed end F2 of the frame 21 is fixed and installed on the vibration source device 2.

When the free end F1 vibrates freely, the free end F1 moves in a direction away from the fixed end F2 or in a direction toward the fixed end F2, and the frame 21 itself also vibrates (deforms). At this time, a state in which the free end F1 moves away from the fixed end F2 (open state) and a state in which the free end F1 moves toward the fixed end F2 (closed state) are repeated. In other words, a state in which the gap between the free end F1 and the fixed end F2 becomes larger (open state) and a state in which the gap becomes smaller (closed state) are repeated.

The magnetostrictive element 32 and power generation magnet 33 of the power generation unit 30 are provided on the frame 21, and the frame 21 is a member that supports these components. The material that constitutes the frame 21 is not particularly limited, but may be, for example, an elastic material. The material that constitutes the frame 21 may be, for example, a material that contains iron. The frame 21 may be, for example, spring steel (bainite steel), cold-rolled steel strip (SPCC: Steel Plate Cold Commercial), etc.

As shown in FIG. 1, the U-shaped frame 21 has a first inner surface 211 and a second inner surface 212 facing each other, and a first outer surface 213 and a second outer surface 214.

Next, the power generating unit 30 will be described. The magnetostrictive element 32 of the power generating unit 30 is a member that is joined to the frame 21. Here, the magnetostrictive element 32 is joined to the first outer surface 213 between the bent portion B and the free end F1.

The shape of the magnetostrictive element 32 is a flat plate, but is not limited to this, and the size of the magnetostrictive element 32 is, for example, about 4 mm × 0.5 mm × 16 mm, but is not limited to this. In this embodiment, the plane of the magnetostrictive element 32 joined to the frame 21, and the plane parallel to this plane when the first vibration power generation device 1 is not vibrating, is the xy plane.

The magnetostrictive element 32 is made of a magnetostrictive material. One example of the magnetostrictive material is an iron-gallium alloy, but the magnetostrictive material is not limited to this and may be, for example, an iron-aluminum alloy or other materials.

The magnetostrictive element 32 is an element that deforms when subjected to vibration. In this embodiment, the magnetostrictive element 32 is joined to the frame 21, so when the frame 21 vibrates, the magnetostrictive element 32 deforms.

The coil 31 is wound around the first inner surface 211 and the first outer surface 213 of the frame 21 and the magnetostrictive element 32. The coil 31 generates a voltage proportional to the change over time of the magnetic flux passing through the magnetostrictive element 32 according to the law of electromagnetic induction.

The material of the coil 31 is, for example, copper, but is not particularly limited to this. In addition, the magnitude of the voltage can be adjusted by changing the number of turns of the coil 31.

The power generating magnet 33 is provided on the second inner surface 212 of the frame 21. The power generating magnet 33 is, for example, a permanent magnet, but is not limited to this and may be an electromagnet. The magnetic flux from the power generating magnet 33 passes through the magnetostrictive element 32.

Although not shown, the first vibration power generation device 1 may include a magnet base, and the magnet base and the power generation magnet 33 may be stacked in order on the second inner surface 212. By providing the magnet base, the power generation magnet 33 can be brought closer to the magnetostrictive element 32.

For example, when the vibration source device 2 vibrates, the frame 21 vibrates. At this time, when the frame 21 vibrates by repeatedly switching between the open and closed states, tensile stress and compressive stress are generated alternately in the magnetostrictive element 32 joined to the frame 21, and the magnetostrictive element 32 expands or contracts, causing deformation.

In this way, when the frame 21 vibrates, the magnetic flux of the magnetostrictive element 32 increases or decreases due to the inverse magnetostrictive effect, and the magnetic flux density penetrating the coil 31 also increases or decreases. This change in magnetic flux density over time generates an induced voltage (or induced current) in the coil 31. In this way, the power generation unit 30 can generate electricity by the vibration of the frame 21.

In addition, when the frame 21 vibrates, the greater the distortion of the magnetostrictive element 32, that is, the greater the amount of deformation of the magnetostrictive element 32, the greater the degree of increase or decrease in the magnetic flux of the magnetostrictive element 32. In other words, the greater the distortion of the magnetostrictive element 32, the greater the generated voltage of the power generation unit 30.

The connecting member 22 is a member that connects the frame 21 and the first weight 60. The connecting member 22 is a member that is attached to the free end F1 of the frame 21. The connecting member 22 is also a member that is attached to the first outer surface 213. The connecting member 22 is, for example, an L1 bracket, but is not limited to this, and may be any member that can fix the positional relationship between the first weight 60 and the frame 21.

The first weight 60 is a weight attached to the connecting member 22. The first weight 60 is attached to the free end F1 of the frame 21 via the connecting member 22. By changing the mass of the first weight 60, the resonant frequency of the first vibration power generation device 1 changes. In addition, the mass and size of the first weight 60 are made changeable.

In this embodiment, the first weight 60 is attached to a surface extending in the direction of the fixed end F2 of the connecting member 22, which is an L1 bracket (i.e., the negative direction of the z-axis), but this is not limited to this. The first weight 60 may be attached to the free end F1 side of the frame 21 without the connecting member 22.

In this embodiment, the connecting member 22 and the frame 21 are fastened together with a screw and a nut. Similarly, the connecting member 22 and the first weight 60 are fastened together with a screw and a nut.

Here, the relationship between the mass of the first weight 60 and the resonant frequency of the first vibration power generation device 1 will be explained using FIG. 3.

Figure 3 is a diagram showing the power generation sensitivity characteristics of the first vibration power generation device 1. Figure 3 shows the power generation sensitivity characteristics of the first vibration power generation device 1 under multiple conditions in which the mass of the first weight 60 is 0.64 g, 1.05 g, 1.40 g, 2.16 g, 2.85 g, 3.76 g, and 5.07 g.

Here, under each of a number of conditions in which the mass is changed, the first vibration power generation device 1 is vibrated by applying white noise generated by a function generator. More specifically, the first vibration device 1 is placed on a vibration base, and the vibration base is vibrated by applying white noise to the vibration base, and the vibration of the vibration base also causes the first vibration power generation device 1 to vibrate.

This vibration causes the first vibration power generation device 1 to generate power. The vertical axis of FIG. 3 shows the value obtained by dividing the generated voltage (V) when the first vibration power generation device 1 is vibrated by a predetermined physical quantity. The peak value of this generated voltage divided by the predetermined physical quantity is the power generation sensitivity, and the power generation sensitivity of the first vibration power generation device 1 is the first power generation sensitivity. In other words, the first power generation sensitivity is an example of the value obtained by dividing the generated voltage by the predetermined physical quantity in the first vibration power generation device 1.

The predetermined physical quantity is a physical quantity related to the displacement of the position of the vibration source device 2. Here, since the first vibration power generation device 1 vibrates due to the vibration of the vibration base, the vibration base can be considered to be the vibration source device 2. Therefore, the predetermined physical quantity is the acceleration (m/ ^s2 ) of the vibration base (vibration source device 2) when the vibration base (vibration source device 2) vibrates. In other words, the predetermined physical quantity is the acceleration applied to the first vibration power generation device 1 due to the vibration of the vibration base (vibration source device 2).

3, the vertical axis indicates a value obtained by dividing the generated voltage (V) when the first vibration power generation device 1 is vibrated by the acceleration (m/ ^s2 ) of the vibration base (vibration source device 2). In this embodiment, the first power generation sensitivity is an example (peak value) of the value obtained by dividing the generated voltage by the acceleration in the first vibration power generation device 1.

The predetermined physical quantity is not limited to the above acceleration obtained by second-order differentiation of the positional displacement, so long as it is a physical quantity related to the positional displacement of the vibration source device 2. The predetermined physical quantity may be the positional displacement of the vibration source device 2, or may be the velocity obtained by differentiation of the positional displacement of the vibration source device 2.

As shown in FIG. 3, the resonant frequency is changed by changing the mass of the first weight 60. In other words, the resonant frequency can be adjusted by the mass of the first weight 60, and there is a one-to-one relationship between the resonant frequency and the mass of the first weight 60. Furthermore, the mass of the first weight 60 depends on the resonant frequency. The resonant frequency is the frequency at which the generated voltage divided by the acceleration reaches a peak value, and corresponds to the first power generation sensitivity. Furthermore, the first power generation sensitivity is changed by changing the resonant frequency. In other words, the first power generation sensitivity can be adjusted by the resonant frequency, and the first power generation sensitivity depends on the resonant frequency.

For example, when the mass of the first weight 60 is 0.64 g, the resonant frequency is 190 Hz and the first power generation sensitivity is 4.2 V/m/ ^s2 . Also, when the mass of the first weight 60 is 2.85 g, the resonant frequency is 98 Hz and the first power generation sensitivity is 6.5 V/m/ ^s2 .

Furthermore, the region where the frequency of the vibration applied to the first vibration power generation device 1 is 98 Hz or more and 200 Hz or less is defined as region A1, and the region where the frequency is 50 Hz or more and less than 98 Hz is defined as region A2. In each of regions A1 and A2, the heavier the mass of the first weight 60, the higher the first power generation sensitivity becomes. This can be explained by the following formulas 1 and 2.

E = (α/c) x F = (α/c) x m x a (Equation 1)

When Equation 1 is further transformed, it becomes Equation 2.

E/a = (α/c) x m (Equation 2)

Note that E is the generated voltage, α is the force coefficient, c is the damping coefficient, F is the force applied to the first vibration power generation device 1, m is the mass of the first weight 60, and a is the acceleration of the vibration base (vibration source device 2). Note that the force coefficient α is a value specific to the first vibration power generation device 1.

The left side of Equation 2 corresponds to the first power generation sensitivity because the generated voltage is divided by the acceleration. In other words, Equations 1 and 2 show that the first power generation sensitivity increases as the mass of the first weight 60 increases, i.e., as it becomes heavier.

It can also be said that in each of the regions A1 and A2, the smaller the resonant frequency of the first vibration power generation device 1, the higher the first power generation sensitivity. However, FIG. 3 shows that when the resonant frequency becomes 80 Hz or lower, the first power generation sensitivity drops sharply.

In FIG. 3, the generated voltage of the first vibration power generation device 1 shown in FIG. 1 is obtained by experimentally measuring the voltage using a voltage measuring device or the like. Furthermore, the acceleration of the vibration source device 2 is obtained by experimentally measuring the acceleration with an acceleration measuring device or the like attached to the vibration base, but is not limited to this.

In other words, the power generation sensitivity characteristic shown in FIG. 3 can be obtained by experimentally measuring the generated voltage and acceleration in the first vibration power generation device 1 in this manner, but is not limited to this. Below, we will explain how to obtain the power generation sensitivity characteristic shown in FIG. 3 by calculation using the finite element method.

Figure 4 is a schematic diagram showing a finite element model according to this embodiment. In this finite element model, the first vibration power generation device 1, frame 21, power generation unit 30, coil 31, magnetostrictive element 32, first weight 60, and fixed end F2 are shown as first vibration power generation device 1a, frame 21a, power generation unit 30a, coil 31a, magnetostrictive element 32a, first weight 60a, and fixed end F2a, respectively.

In addition, in the finite element model, the first vibration power generation device 1a is represented by a number of nodes and a number of bars. In FIG. 4, the nodes are represented by open circles and the bars by lines. Each of the multiple nodes and multiple bars is assigned characteristics such as stiffness, mass, and damping coefficient.

By using this type of finite element method calculation, it is possible to obtain the power generation sensitivity characteristics shown in Figure 3.

This calculation calculates the strain deformation speed of the magnetostrictive element 32a for each frequency of vibration applied to the first vibration power generation device 1a under each of a plurality of conditions with the mass of the first weight 60a as a parameter. The higher the strain deformation speed of the magnetostrictive element 32a, the higher the generated voltage of the power generation unit 30a. The value obtained by dividing the strain deformation speed of the magnetostrictive element 32a by the acceleration calculated by the finite element method corresponds to the value obtained by dividing the generated voltage (V) when the first vibration power generation device 1 in FIG. 3 is vibrated by the acceleration (m/ ^s2 ) of the vibration base (vibration source device 2).

In this way, the power generation sensitivity characteristics shown in Figure 3 can be obtained by calculations using the finite element method described above.

Here, we further explain the vibration that the vibration source device 2 imparts to the first vibration power generation device 1.

Figure 5 is a diagram showing the change over time in a physical quantity related to the displacement of the position of the vibration source device 2 according to this embodiment. As described above, this physical quantity according to this embodiment is the acceleration of the vibration source device 2 when it vibrates. In other words, this physical quantity is the acceleration applied to the first vibration power generation device 1 by the vibration of the vibration source device 2.

The acceleration shown in Figure 5 was obtained by actual measurement through experiments with an acceleration measuring device etc. attached to the vibration source device 2.

Figure 6 shows a diagram in which FFT (Fast Fourier Transform) analysis is performed on the time change of the physical quantity shown in Figure 5. Figure 6 shows a power spectrum indicating a physical quantity (here, acceleration) related to the displacement of the position of the vibration source device 2, and this power spectrum is referred to as the first spectrum.

As shown in FIG. 6, the vibration of the vibration source device 2 has multiple frequency components. Furthermore, this first spectrum includes multiple first peak frequencies. The multiple first peak frequencies are 54 Hz, 107 Hz, and 160 Hz, respectively. Note that the frequency at which the acceleration exceeds a predetermined threshold value may be set as the first peak frequency. Note that peaks corresponding to noise may be removed by averaging processing or the like.

In this embodiment, as shown in FIG. 5, the acceleration is measured from 0 seconds to 8 seconds. The first spectrum shown in FIG. 6 is obtained by performing FFT analysis on the acceleration from 0 seconds to 8 seconds shown in FIG. 5, that is, by performing FFT analysis on the acceleration over several seconds.

Figure 5 is also a graph that includes the acceleration from 0 seconds to 4 seconds and the acceleration from 4 seconds to 8 seconds. Therefore, the first spectrum is also the sum of the spectrum obtained by performing FFT analysis on the acceleration from 0 seconds to 4 seconds and the spectrum obtained by performing FFT analysis on the acceleration from 4 seconds to 8 seconds.

In this embodiment, the first spectrum is also the sum of multiple spectra (here, two spectra) based on physical quantities from a first time (e.g., 0 seconds) to a second time (e.g., 8 seconds) that is later than the first time.

As shown in FIG. 6, the vibration of the vibration source device 2 has multiple frequency components, and more specifically, multiple first peak frequencies. In this case, if an appropriate frequency can be selected from the multiple first peak frequencies as the resonant frequency of the first vibration power generation device 1, the generated voltage of the first vibration power generation device 1 can be increased. Furthermore, as described above, the resonant frequency is adjusted by the mass of the first weight 60. Therefore, if the mass of the first weight 60 can be selected such that the resonant frequency of the first vibration power generation device 1 is the appropriate frequency, the generated voltage of the first vibration power generation device 1 can be increased.

The following describes a selection device 100 for selecting a resonant frequency and a mass of the first weight 60 that can increase the generated voltage of the first vibration power generation device 1.

[Configuration of the selection device]
7 is a block diagram showing a functional configuration of a selection device 100 according to the present embodiment. The selection device 100 according to the present embodiment is a device for selecting a resonant frequency and a mass of the first weight 60 that can increase the generated voltage of the first vibration power generation device 1, and is a selection device for selecting the first vibration power generation device 1.

For example, the selection device 100 is a mobile terminal such as a smartphone or a tablet terminal. The selection device 100 may also be a dedicated device for selecting a resonant frequency and a mass of the first weight 60 that can increase the generated voltage of the first vibration power generation device 1.

As shown in FIG. 7, the selection device 100 includes an information processing unit 110, a communication unit 120, a sensor unit 130, a memory unit 140, and a display device 150.

First, the information processing unit 110 will be briefly described, but a more detailed description will be given in the [Operation Example] below. In addition, the information processing unit 110 is realized, for example, by a microcomputer, but may also be realized by a processor.

The information processing unit 110 is a processing unit that selects a resonant frequency and a mass of the first weight 60 that can increase the generated voltage of the first vibration power generation device 1. The information processing unit 110 has an acquisition unit 111, a calculation unit 112, a determination unit 113, and an output unit 114.

The acquisition unit 111 includes a first acquisition unit 1111, a second acquisition unit 1112, and a third acquisition unit 1113.

The acquisition unit 111 is a processing unit that acquires a first sensitivity function, a first mass function, and a first spectrum. As an example, the acquisition unit 111 acquires the first sensitivity function, the first mass function, and the first spectrum stored in the storage unit 140. Furthermore, the first acquisition unit 1111 acquires the first sensitivity function, the second acquisition unit 1112 acquires the first mass function, and the third acquisition unit 1113 acquires the first spectrum.

The first sensitivity function is a function that indicates the dependency of the first power generation sensitivity on the resonant frequency. As shown in FIG. 3, in each of the regions A1 and A2, the smaller the resonant frequency of the first vibration power generation device 1, the higher the first power generation sensitivity. In other words, the first power generation sensitivity depends on the resonant frequency, and the first sensitivity function is a function that indicates this dependency.

The first mass function is a function that indicates the dependence of the mass of the first weight 60 on the resonant frequency. As shown in FIG. 3, in each of the regions A1 and A2, there is a one-to-one relationship between the resonant frequency and the mass of the first weight 60. The mass of the first weight 60 depends on the resonant frequency, and the first mass function is a function that indicates this dependence.

The first spectrum is a spectrum that indicates a physical quantity (here, acceleration) related to the displacement of the position of the vibration source device 2, and is the spectrum shown in Figure 6.

The calculation unit 112 includes a first calculation unit 1121, a second calculation unit 1122, and a third calculation unit 1123.

The first calculation unit 1121 calculates a first power generation sensitivity corresponding to each of the multiple first peak frequencies based on each of the multiple first peak frequencies included in the first spectrum acquired by the acquisition unit 111 and the acquired first sensitivity function.

Furthermore, the second calculation unit 1122 multiplies each of the multiple first power generation sensitivities calculated by the first calculation unit 1121 by the physical quantity (here, acceleration) of the first peak frequency indicating the calculated first power generation sensitivity. In this way, the second calculation unit 1122 calculates the generated voltage at each of the multiple first peak frequencies.

Furthermore, the third calculation unit 1123 calculates the mass of the first weight 60 corresponding to the determined first peak frequency based on the first peak frequency determined by the determination unit 113 described below and the acquired first mass function.

The determination unit 113 determines a first peak frequency that indicates the largest value (largest generated voltage) among the multiple generated voltages calculated by the calculation unit 112.

The output unit 114 outputs the first peak frequency determined by the determination unit 113 and the mass of the first weight 60 calculated by the calculation unit 112.

The communication unit 120 is a communication module (communication circuit) that allows the selection device 100 to communicate with devices other than the selection device 100. For example, the communication unit 120 communicates with the voltage measuring device and acceleration measuring device described above. The communication unit 120 acquires the first sensitivity function from the voltage measuring device or the acceleration measuring device. The communication performed by the communication unit 120 is, for example, wireless communication, but may also be wired communication. There is also no particular limitation on the communication standard used for the communication.

The sensor unit 130 has an acceleration sensor 131 that measures acceleration, and a sensor control unit 132. For example, the acceleration sensor 131 measures the acceleration of the vibration source device 2 shown in FIG. 5. Furthermore, the sensor control unit 132 performs FFT (Fast Fourier Transform) analysis to obtain the first spectrum shown in FIG. 6. The obtained first spectrum is stored in the memory unit 140.

As described above, since the sensor unit 130 has the acceleration sensor 131, the selection device 100, which is a smartphone, can also be said to be an acceleration measurement device for measuring acceleration. The sensor control unit 132 is realized, for example, by a microcomputer, but may also be realized by a processor.

As described above, the selection device 100 (acceleration measurement device) is attached to the vibration source device 2 to measure acceleration. The sensor control unit 132 of the sensor unit 130 performs FFT analysis based on this acceleration, thereby obtaining the first spectrum shown in Figure 6.

The storage unit 140 is a storage device in which the first sensitivity function, the first mass function, and the first spectrum acquired by the acquisition unit 111 are stored. The storage unit 140 also stores programs executed by the calculation unit 112 and the determination unit 113, and various information used to perform information processing. Furthermore, the storage unit 140 also stores images to be displayed on the display device 150.

The storage unit 140 is realized by a storage device such as a semiconductor memory such as a ROM (Read Only Memory), a RAM (Random Access Memory), or a flash memory, or a solid state drive (SSD).

The display device 150 is a device that displays information indicating the first peak frequency determined by the information processing unit 110 and the calculated mass of the first weight 60. The display device 150 includes a display such as a liquid crystal panel or an organic EL1 (Electro Luminescence) panel.

The display device 150 has a display unit 151 and a reception unit 152.

The display unit 151 is a display that displays the display screen.

The reception unit 152 is a user interface such as a keyboard or a mouse that receives instructions (operations) from a user. For example, the display unit 151 and the reception unit 152 may be integrally formed by a touch panel display or the like. In the following, the display device 150 will be described as including a touch panel display in which the display unit 151 and the reception unit 152 are integrally formed.

[Operation example 1]
Hereinafter, a first operational example of the selection device 100 will be described with reference to FIG.

Figure 8 is a flowchart of operation example 1 of the selection device 100 according to this embodiment. Operation example 1 shown in Figure 8 is an operation example performed, for example, when the first vibration power generation device 1 is attached to the vibration source device 2. At this time, the user of the selection device 100 needs to attach a first weight 60 of an appropriate mass to the connecting member 22 so as to increase the generated voltage of the attached first vibration power generation device 1. By performing the following operation example 1, the generated voltage of the first vibration power generation device 1 can be increased. For example, the following operation example 1 is started when the reception unit 152 of the selection device 100 receives an operation for starting operation example 1 from the user.

First, the acquisition unit 111 (more specifically, the first acquisition unit 1111) acquires a first sensitivity function indicating the dependency of the first power generation sensitivity on the resonant frequency, the first sensitivity function being calculated by dividing the generated voltage when the first vibration power generation device 1 is vibrated by a physical quantity (here, acceleration) (S10). For example, the acquisition unit 111 acquires the first sensitivity function stored in the storage unit 140. Note that this step S10 corresponds to the first acquisition step.

As described above, the first power generation sensitivity is the peak value of the generated voltage (V) when the first vibration power generation device 1 is vibrated divided by the acceleration (m/ ^s2 ) of the vibration base (vibration source device 2). In the example shown in Fig. 3, when the resonant frequency is 190 Hz, the first power generation sensitivity is 4.2 V/m/ ^s2 , and when the resonant frequency is 98 Hz, the first power generation sensitivity is 6.5 V/m/ ^s2 .

In the example shown in FIG. 3, in each of the regions A1 and A2, the smaller the resonant frequency of the first vibration power generation device 1, the higher the first power generation sensitivity. However, when the resonant frequency becomes 80 Hz or less, the first power generation sensitivity drops sharply. For this reason, in this embodiment, the acquisition unit 111 acquires the first sensitivity function of the region A1 and the first sensitivity function of the region A2 from the storage unit 140.

The first sensitivity function for area A1 is shown in Equation 3.

_S1 (f _tip )=-0.023f _tip +8.713 (Equation 3)

It should be noted that _S1 is the first power generation sensitivity in the region A1.

The first sensitivity function for area A2 is shown in Equation 4.

_S2 (f _tip )=-0.044f _tip +8.628 (Equation 4)

In addition, _S2 is the first power generation sensitivity in the region A2. FIG. 3 shows _S1 and _S2 , which are the first power generation sensitivities. In addition, in formulas 3 and 4, the resonant frequency is expressed as f _tip . That is, when the resonant frequency is 98 Hz or more and 200 Hz or less (i.e., in the range of region A1), when a numerical value is substituted for the resonant frequency f _tip in formula 3, which is the first sensitivity function, _S1, which is the first power generation sensitivity at that resonant frequency, is calculated. Similarly, when the resonant frequency is 50 Hz or more and less than 98 Hz (i.e., in the range of region A2), when a numerical value is substituted for the resonant frequency f _tip in formula 4, which is the first sensitivity function _{, S2} , which is the first power generation sensitivity at that resonant frequency, is calculated.

Note that, although the first sensitivity function is a linear function here, this is not limited to this. For example, the first sensitivity function may be an nth-order function (n is a natural number equal to or greater than 2) or an exponential function.

Next, the acquisition unit 111 (more specifically, the second acquisition unit 1112) acquires a first mass function that indicates the dependency of the mass of the first weight 60 on the resonant frequency (S20). For example, the acquisition unit 111 acquires the first mass function stored in the storage unit 140. Note that this step S20 corresponds to a second acquisition step.

As described above, the mass of the first weight 60 depends on the resonant frequency. The first mass function is a function that indicates this dependency. The relationship between the mass of the first weight 60 and the resonant frequency is expressed by Equation 5.

Furthermore, when equation 5 is transformed, equation 6 is obtained, which shows the first mass function.

In Equation 5 and Equation 6, the mass of the first weight 60 is m, the spring constant of the first vibration power generation device 1 is K, and the equivalent mass of the first vibration power generation device 1 (mass without the first weight 60) is M.

In this embodiment, the first mass function, Equation 6, is obtained based on the theoretical equation, Equation 5, but is not limited to this.

For example, the first mass function may be derived by calculation using the finite element method. Also, for example, the first mass function may be derived by performing an experiment and measuring it.

Then, the acquisition unit 111 (more specifically, the third acquisition unit 1113) acquires a first spectrum of a physical quantity (here, acceleration) related to the displacement of the position of the vibration source device 2 (S30). For example, the acquisition unit 111 acquires the first spectrum stored in the storage unit 140. Note that this step S30 corresponds to a third acquisition step.

The first spectrum in this embodiment is the power spectrum shown in FIG. 6.

In this manner, in steps S10 to S30, the acquisition unit 111 acquires the first sensitivity function, the first mass function, and the first spectrum from the storage unit 140. In other words, the first sensitivity function, the first mass function, and the first spectrum may be stored in the storage unit 140 before steps S10 to S30 are performed, and for this reason, as an example, the following processing may be performed before the processing of steps S10 to S30 is performed.

In this embodiment, in the power generation sensitivity characteristic shown in FIG. 3, the generated voltage is measured by a voltage measuring device, and the acceleration is measured by an acceleration measuring device. For example, the voltage measuring device or the acceleration measuring device calculates a first sensitivity function based on the measured power generation sensitivity characteristic, and outputs the calculated first sensitivity function to the communication unit 120 possessed by the selection device. As a result, the communication unit 120 acquires the first sensitivity function, and the acquired first sensitivity function is preferably stored in the memory unit 140.

The reception unit 152 of the selection device 100 may receive an operation from a user of the selection device 100 for storing information indicating the first mass function in the storage unit 140. The first mass function may be stored in the storage unit 140 based on this operation.

In addition, in this embodiment, the sensor unit 130 measures the acceleration of the vibration source device 2 shown in FIG. 5, and performs FFT analysis to obtain the first spectrum shown in FIG. 6. The obtained first spectrum may be stored in the storage unit 140.

Furthermore, operation example 1 will be explained using Figure 8.

The calculation unit 112 (more specifically, the first calculation unit 1121) calculates a first power generation sensitivity corresponding to each of the multiple first peak frequencies based on each of the multiple first peak frequencies included in the acquired first spectrum and the acquired first sensitivity function (here, the first sensitivity function of area A1 and the first sensitivity function of area A2) (S40). Note that this step S40 corresponds to the first calculation step.

Step S40 is explained in detail below.

The multiple first peak frequencies included in the first spectrum are 54 Hz, 107 Hz, and 160 Hz. The three first peak frequencies are substituted as f _tip of the first sensitivity function shown in Equation 3 and Equation 4, thereby calculating the first power generation sensitivity corresponding to the three first peak frequencies. Note that in this embodiment, since the first sensitivity function of region A1 and the first sensitivity function of region A2 are acquired, of the three first peak frequencies, 107 Hz and 160 Hz are substituted as f _tip of the first sensitivity function of region A1, and 54 Hz is substituted as f _tip of the first sensitivity function of region A2.

In step S40, the first power generation sensitivity is calculated for each of the multiple first peak frequencies in the first vibration power generation device 1. In other words, the first power generation sensitivity is calculated for the cases where the resonant frequency is 54 Hz, the resonant frequency is 107 Hz, and the resonant frequency is 160 Hz.

In this way, in step S40, multiple first power generation sensitivities are calculated.

Then, the calculation unit 112 (more specifically, the second calculation unit 1122) calculates the generated voltage at each of the multiple first peak frequencies by multiplying each of the multiple calculated first power generation sensitivities by the physical quantity (here, acceleration) of the first peak frequency that indicates the calculated first power generation sensitivity (S50). Note that this step S50 corresponds to the second calculation step.

As an example, the generated voltage for the first power generation sensitivity when the resonant frequency is 160 Hz will be described. In step S30, the first power generation sensitivity when the resonant frequency is 160 Hz (an example of the first peak frequency) is calculated. The first peak frequency indicating the first power generation sensitivity is 160 Hz, and the physical quantity (acceleration) of this first peak frequency is 3.4 m/s ² as shown in FIG. 6. As described above, the first power generation sensitivity is a value obtained by dividing the generated voltage (V) by the acceleration (m/s ² ). Therefore, the calculation unit 112 multiplies the first power generation sensitivity (V/m/s ² ) when the resonant frequency is 160 Hz (an example of the first peak frequency) by the acceleration (m/s ² ) of the first peak frequency indicating the first power generation sensitivity, thereby calculating the generated voltage (V). This generated voltage (V) means the generated voltage when the resonant frequency is 160 Hz (an example of the first peak frequency).

In step S50, the same process is performed even when the resonant frequency is a plurality of other first peak frequencies different from 160 Hz. In other words, the calculation unit 112 calculates the generated voltage when the resonant frequency is 54 Hz (an example of a first peak frequency) and the generated voltage when the resonant frequency is 107 Hz (an example of a first peak frequency) in addition to the generated voltage when the resonant frequency is 160 Hz.

More specifically, the generated voltages when the resonant frequencies were 54 Hz, 107 Hz, and 160 Hz were 11.0 V, 12.6 V, and 17.2 V, respectively. In other words, it is expected that the generated voltage increases in the order of the resonant frequencies from 54 Hz to 107 Hz to 160 Hz.

In this way, in step S50, the calculation unit 112 calculates multiple (three) generated voltages for the first vibration power generation device 1.

Then, the determination unit 113 determines the first peak frequency that indicates the largest value among the multiple generated voltages calculated by the calculation unit 112 (S60). This step S60 corresponds to the determination step.

The largest value (generated voltage) among the multiple generated voltages calculated is 17.2 V. The first peak frequency indicating this value is 160 Hz. In other words, the determination unit 113 determines that the first peak frequency indicating the largest value among the multiple generated voltages calculated by the calculation unit 112 is 160 Hz.

Furthermore, the calculation unit 112 (more specifically, the third calculation unit 1123) calculates the mass of the first weight 60 corresponding to the determined first peak frequency based on the first peak frequency determined by the determination unit 113 and the first mass function acquired by the acquisition unit 111 (S70). This step S70 corresponds to a third calculation step.

The calculation unit 112 calculates the mass of the first weight 60 corresponding to the determined first peak frequency based on the determined first peak frequency (160 Hz) and the first mass function shown in Equation 6. Here, the determined first peak frequency is substituted as f _tip of the first mass function shown in Equation 6, thereby calculating the mass of the first weight 60 corresponding to the determined first peak frequency. Note that the mass of the first weight 60 corresponding to the determined first peak frequency is the mass of the first weight 60 for the resonant frequency to be the determined first peak frequency (160 Hz). In other words, when the first vibration power generation device 1 includes the first weight 60 having this mass, the resonant frequency of the first vibration power generation device 1 becomes the determined first peak frequency (160 Hz).

In this embodiment, the calculated mass of the first weight 60 was 0.94 g.

Then, the output unit 114 outputs the first peak frequency (160 Hz) determined by the determination unit 113 and the mass (0.94 g) of the first weight 60 calculated by the calculation unit 112 (S80). This step S80 corresponds to an output step.

When the output unit 114 outputs the first peak frequency and the mass of the first weight 60, an image indicating that the first peak frequency is 160 Hz and that the mass of the first weight 60 is 0.94 g is displayed on the display unit 151. For example, such an image may be stored in the memory unit 140.

In this way, an image is displayed indicating that the first peak frequency is 160 Hz and that the mass of the first weight 60 is 0.94 g, allowing the user to attach the first weight 60, which has a mass of 0.94 g, to the frame 21 so that the first peak frequency is 160 Hz.

As described above, if the mass of the first weight 60 is 0.94 g, the resonant frequency can be set to 160 Hz, and the generated voltage in this case can be set to the largest value (generated voltage) among the multiple generated voltages. In other words, the generated voltage of the first vibration power generation device 1 can be increased.

Furthermore, the inventors conducted the following demonstration experiment to verify whether the generated voltage of the first vibration power generation device 1 can be maximized when the first peak frequency is 160 Hz and the mass of the first weight 60 is 0.94 g.

[Demonstration experiment]
Here, the mass of the first weight 60 was changed so that the resonant frequency became each of the multiple first peak frequencies (54 Hz, 107 Hz, and 160 Hz), and the generated voltage of the first vibration power generation device 1 was measured.

In other words, here, a first weight 60 with a mass that results in a resonant frequency of 54 Hz, a first weight 60 with a mass that results in a resonant frequency of 107 Hz, and a first weight 60 with a mass that results in a resonant frequency of 160 Hz were attached in that order to the same first vibration power generation device 1, and the generated voltage was measured.

Regardless of which first weight 60 was attached, the first vibration power generation device 1 was subjected to the vibration (acceleration) shown in FIG. 5 and the generated voltage was measured. Here, the first vibration power generation device 1 was attached to the vibration source device 2 and vibrated. The generated voltage in each case was measured.

Figure 9 shows the change over time in the generated voltage when the mass of the first weight 60 of the first vibration power generation device 1 according to this embodiment is changed. Figure 9 shows that the generated voltage increases in the order of the resonant frequency from 54 Hz to 107 Hz and 160 Hz.

Figure 10 is a detailed table of the multiple generated voltages shown in Figure 9. Vp-p indicates the difference between the minimum and maximum generated voltages, and Vrms indicates the average generated voltage. Both Vp-p and Vrms increase in the order of the resonant frequencies, which are 54 Hz, 107 Hz, and 160 Hz.

In operational example 1, it was predicted that the generated voltage would increase as the resonant frequencies increased from 54 Hz to 107 Hz and then to 160 Hz, and the experimental results demonstrated this prediction, proving the prediction to be correct.

In this way, it was demonstrated that the generated voltage of the first vibration power generation device 1 can be maximized when the first peak frequency is 160 Hz and the mass of the first weight 60 is 0.94 g.

After the first weight 60 with the mass output in step S80 is attached, the following process may be performed to finely adjust the resonant frequency.

A tin plate made of tin is attached to the first weight 60, and the tin plate is then bent as necessary. The resonant frequency of the first vibration power generation device 1 can be further adjusted by both attaching the tin plate and bending the tin plate. This further adjusts the resonant frequency, thereby further increasing the generated voltage of the first vibration power generation device 1.

[Effects, etc.]
The selection method according to the present embodiment is a selection method by the selection device 100 of the first vibration power generation device 1 including the first weight 60, and includes a first acquisition step, a second acquisition step, a third acquisition step, a first and second calculation step, a determination step, a third calculation step, and an output step. In the first acquisition step (step S10), a first sensitivity function is acquired that indicates the dependency of the first power generation sensitivity on the resonance frequency, the first sensitivity function being obtained by dividing the generated voltage when the first vibration power generation device 1 is vibrated by the physical quantity. In the second acquisition step (step S20), a first mass function is acquired that indicates the dependency of the mass of the first weight 60 on the resonance frequency. In the third acquisition step (step S30), a first spectrum of the physical quantity related to the displacement of the position of the vibration source device 2 is acquired. In the first calculation step (step S40), a first power generation sensitivity corresponding to each of the multiple first peak frequencies is calculated based on each of the multiple first peak frequencies included in the acquired first spectrum and the acquired first sensitivity function. In a second calculation step (step S50), a generated voltage at each of a plurality of first peak frequencies is calculated by multiplying each of the calculated plurality of first power generation sensitivities by a physical quantity of the first peak frequency indicating the calculated first power generation sensitivity. In a determination step (step S60), a first peak frequency indicating the largest value of the calculated plurality of generated voltages is determined. In a third calculation step (step S70), a mass of the first weight 60 corresponding to the determined first peak frequency is calculated based on the determined first peak frequency and the acquired first mass function. In an output step (step S80), the determined first peak frequency and the calculated mass of the first weight 60 are output.

In this way, in the selection method according to the present embodiment, the determined first peak frequency and the calculated mass of the first weight 60 are output. For example, in the operation example 1, the display unit 151 displays an image indicating that the first peak frequency is 160 Hz and that the mass of the first weight 60 is 0.94 g. The determined first peak frequency is a frequency that indicates the largest value (largest generated voltage) among the generated voltages at each of the multiple first peak frequencies included in the first spectrum. The generated voltage of the first vibration power generation device 1 can be increased by setting the resonant frequency of the first vibration power generation device 1 to the determined first peak frequency. Furthermore, the calculated mass of the first weight 60 is a mass that corresponds to the determined first peak frequency and is a mass for setting the resonant frequency to the determined first peak frequency (160 Hz).

Therefore, the selection method according to this embodiment includes the above configuration, and the determined first peak frequency and the calculated mass of the first weight 60 are output, allowing the user to attach the first weight 60 to the frame 21 with a mass such that the resonant frequency is the first peak frequency. As a result, the generated voltage of the first vibration power generation device 1 can be increased. In other words, a selection method is realized that can easily select a resonant frequency and a mass of the first weight 60 that can increase the generated voltage.

In this embodiment, the physical quantity is acceleration.

This makes it easy to acquire the first spectrum in the third acquisition step.

In this embodiment, the acquired first sensitivity function may be a function calculated by the finite element method.

As described above, the power generation sensitivity characteristic shown in FIG. 3 may be obtained by calculation using the finite element method. In this case, the first sensitivity characteristic may be obtained based on the power generation sensitivity characteristic obtained by the calculation. In other words, since the power generation sensitivity characteristic can be obtained even if the generated voltage of the first vibration power generation device 1 is not actually measured by an experiment because a voltage measuring device is used, the first sensitivity characteristic can be obtained more easily.

In this embodiment, the first spectrum of the physical quantity is the sum of multiple spectra based on the physical quantity from a first time to a second time that is later than the first time.

This allows the first spectrum to more accurately represent the physical quantity related to the displacement of the position of the vibration source device 2.

The computer program according to this embodiment is a computer program for causing a computer to execute the selection method described above.

This realizes a selection method that can easily select a resonant frequency and the mass of the first weight 60 that can increase the generated voltage.

The selection device 100 according to this embodiment is a selection device 100 for a first vibration power generation device 1 having a first weight 60. The selection device 100 includes a first acquisition unit 1111, a second acquisition unit 1112, a third acquisition unit 1113, a first calculation unit 1121, a second calculation unit 1122, a determination unit 113, a third calculation unit 1123, and an output unit 114. The first acquisition unit 1111 acquires a first sensitivity function indicating the dependency of a first power generation sensitivity on a resonance frequency obtained by dividing a generated voltage when the first vibration power generation device 1 is vibrated by a physical quantity. The second acquisition unit 1112 acquires a first mass function indicating the dependency of the mass of the first weight 60 on the resonance frequency. The third acquisition unit 1113 acquires a first spectrum of a physical quantity related to the displacement of the position of the vibration source device 2. The first calculation unit 1121 calculates a first power generation sensitivity corresponding to each of the first peak frequencies based on each of the first peak frequencies included in the acquired first spectrum and the acquired first sensitivity function. The second calculation unit 1122 calculates a generated voltage at each of the first peak frequencies by multiplying each of the calculated first power generation sensitivity by a physical quantity of the first peak frequency indicating the calculated first power generation sensitivity. The determination unit 113 determines a first peak frequency indicating the largest value among the calculated generated voltages. The third calculation unit 1123 calculates a mass of the first weight 60 corresponding to the determined first peak frequency based on the determined first peak frequency and the acquired first mass function. The output unit 114 outputs the determined first peak frequency and the calculated mass of the first weight 60.

In this way, the selection device 100 according to the present embodiment outputs the determined first peak frequency and the calculated mass of the first weight 60. For example, in the operation example 1, the display unit 151 displays an image indicating that the first peak frequency is 160 Hz and that the mass of the first weight 60 is 0.94 g. The determined first peak frequency is a frequency that indicates the largest value (largest generated voltage) among the generated voltages at each of the multiple first peak frequencies included in the first spectrum. The generated voltage of the first vibration power generation device 1 can be increased by making the resonant frequency of the first vibration power generation device 1 the determined first peak frequency. Furthermore, the calculated mass of the first weight 60 is a mass that corresponds to the determined first peak frequency and is a mass for making the resonant frequency the determined first peak frequency (160 Hz).

Therefore, the selection device 100 according to this embodiment includes the above configuration, and outputs the determined first peak frequency and the calculated mass of the first weight 60, allowing the user to attach the first weight 60 to the frame 21 with a mass such that the resonant frequency is the first peak frequency. As a result, the generated voltage of the first vibration power generation device 1 can be increased. In other words, a selection device 100 is realized that can easily select a resonant frequency and a mass of the first weight 60 that can increase the generated voltage.

(Modification)
Modifications of the embodiment will be described below, focusing on the differences from the embodiment, and explanations of commonalities will be omitted or simplified.

[composition]
In the embodiment, the device targeted by the selection device 100 is only the first vibration power generation device 1, but this is not limited to the modified example. In this modified example, the selection device 100 selects one of the first vibration power generation device 1 and a second vibration power generation device 1b different from the first vibration power generation device 1, which has a higher generated voltage.

First, we will explain the second vibration power generation device 1b in this modified example.

Figure 11 is a side view of the second vibration power generation device 1b according to this modified example. The second vibration power generation device 1b has the same configuration as the first vibration power generation device 1, except that it has a frame 21b instead of the frame 21, and a second weight 60b instead of the first weight 60.

Frame 21b has the same configuration as frame 21, except that thickness d2 is thicker than thickness d1 and total length L2 is longer than total length L1. For example, thickness d2 is twice as thick as thickness d1, and total length L2 is twice as long as total length L1. In addition, the magnetostrictive element 32 provided in the second vibration power generation device 1b may be larger than the magnetostrictive element 32 provided in the first vibration power generation device 1.

In other words, the second vibration power generation device 1b is a larger device than the first vibration power generation device 1.

The second weight 60b is a weight that is attached to the connecting member 22, just like the first weight 60. Changing the mass of the second weight 60b changes the resonant frequency of the second vibration power generation device 1b. In addition, the mass and size of the second weight 60b are made changeable.

In this modified example, for ease of identification, the weight provided in the second vibration power generation device 1b is described as the second weight 60b, and the weight provided in the first vibration power generation device 1 is described as the first weight 60.

As described above, the first vibration power generation device 1 and the second vibration power generation device 1b are different in size. Therefore, the power generation sensitivity characteristics of the first vibration power generation device 1 and the second vibration power generation device 1b are different. The power generation sensitivity characteristics of the first vibration power generation device 1 are as shown in FIG. 3. Here, the power generation sensitivity characteristics of the first vibration power generation device 1 and the second vibration power generation device 1b are compared.

Figure 12 is a diagram that shows the power generation sensitivity characteristics of the first vibration power generation device 1 and the second vibration power generation device 1b. Here, (a) of Figure 12 is a diagram that shows the power generation sensitivity characteristics of the first vibration power generation device 1, and (b) of Figure 12 is a diagram that shows the power generation sensitivity characteristics of the second vibration power generation device 1b.

Here, the second power generation sensitivity of the second vibration power generation device 1b is a value equivalent to the first power generation sensitivity of the first vibration power generation device 1, and is an example of a value (peak value) obtained by dividing the generated voltage by the acceleration in the second vibration power generation device 1b.

As shown in FIG. 12(b), the resonant frequency of the second vibration power generation device 1b is changed by changing the mass of the second weight 60b. In other words, the resonant frequency can be adjusted by the mass of the second weight 60b, and there is a one-to-one relationship between the resonant frequency and the mass of the second weight 60b. Furthermore, the mass of the second weight 60b depends on the resonant frequency. The resonant frequency is the frequency at which the generated voltage divided by the acceleration reaches a peak value, and corresponds to the second power generation sensitivity. Furthermore, the second power generation sensitivity is changed by changing the resonant frequency. In other words, the second power generation sensitivity can be adjusted by the resonant frequency, and the second power generation sensitivity depends on the resonant frequency.

For example, even if the mass of the first weight 60 and the mass of the second weight 60b are used so that the resonant frequency of the first vibration power generation device 1 and the resonant frequency of the second vibration power generation device 1b are the same (e.g., frequency f1), the value of the first power generation sensitivity and the value of the second power generation sensitivity are different.

For this reason, when there is a first vibration power generation device 1 and a second vibration power generation device 1b that are different in size, as in this modified example, it is necessary to determine which device should be attached to the vibration source device 2 to obtain a higher generated voltage. Below, we will explain operation example 2, in which the selection device 100 is used to select a device with a higher generated voltage.

[Operation example 2]
Hereinafter, the second operation example of the selection device 100 will be described with reference to Fig. 13. Note that the description of points common to the first operation example will be omitted or simplified.

Figure 13 is a flowchart of operation example 2 of the selection device 100 according to this modified example. Operation example 2 shown in Figure 13 is an operation example performed, for example, when the first vibration power generation device 1 or the second vibration power generation device 1b is attached to the vibration source device 2.

First, in the first acquisition step, the acquisition unit 111 acquires the first sensitivity function as in step S10, and also acquires the second sensitivity function here (S11). Note that the second sensitivity function of the second vibration power generation device 1b is a function equivalent to the first sensitivity function of the first vibration power generation device 1. In other words, the second sensitivity function is a function that indicates the dependency of the second power generation sensitivity, which is obtained by dividing the generated voltage when the second vibration power generation device 1b is vibrated by a physical quantity (here, acceleration), on the resonant frequency (more specifically, the resonant frequency of the second vibration power generation device 1b).

Next, in the second acquisition step, the acquisition unit 111 acquires the first mass function as in step S20, and also acquires the second mass function here (S21). Note that the second mass function of the second vibration power generation device 1b is a function equivalent to the first mass function of the first vibration power generation device 1. In other words, the second mass function is a function that indicates the dependency of the mass of the second weight 60b on the resonant frequency (more specifically, the resonant frequency of the second vibration power generation device 1b).

Next, in the third acquisition step, the acquisition unit 111 acquires the first spectrum as in step S30, and here also acquires the second spectrum (S31). Note that the second spectrum of the second vibration power generation device 1b is a spectrum equivalent to the first spectrum of the first vibration power generation device 1. In other words, the second spectrum is a spectrum of a physical quantity (here, acceleration) related to the displacement of the position of the vibration source device 2.

Now, the second spectrum will be explained. The selection device 100 (acceleration measuring device) is attached to the vibration source device 2, thereby measuring the acceleration of the vibration source device 2. The sensor control unit 132 of the sensor unit 130 performs FFT analysis based on this acceleration, thereby obtaining the second spectrum.

Note that both the first spectrum and the second spectrum are obtained by measuring the acceleration of the vibration source device 2. Therefore, in this modified example, the first spectrum and the second spectrum are the same spectrum.

In steps S11 to S31, the acquisition unit 111 acquires the first sensitivity function, the first mass function, the first spectrum, the second sensitivity function, the second mass function, and the second spectrum from the storage unit 140. In other words, it is preferable that the first sensitivity function, the first mass function, the first spectrum, the second sensitivity function, the second mass function, and the second spectrum are stored in the storage unit 140 before steps S11 to S31 are performed.

Furthermore, in the first calculation step, the calculation unit 112 calculates the first power generation sensitivity as in step S40, and also calculates the second power generation sensitivity here (S41). The calculation unit 112 calculates the second power generation sensitivity corresponding to each of the multiple second peak frequencies based on each of the multiple second peak frequencies included in the acquired second spectrum and the acquired second sensitivity function.

In this modified example, the first spectrum and the second spectrum are the same spectrum. Therefore, each of the multiple second peak frequencies included in the second spectrum is the same as each of the multiple first peak frequencies included in the first spectrum, and is 54 Hz, 107 Hz, and 160 Hz. Based on each of the three second peak frequencies and the second sensitivity function, the second power generation sensitivity corresponding to the three second peak frequencies is calculated.

In step S41, the first power generation sensitivity is calculated for the first vibration power generation device 1 when the resonant frequency is one of the multiple first peak frequencies. That is, here, the first power generation sensitivity is calculated for the cases where the resonant frequency is 54 Hz, where the resonant frequency is 107 Hz, and where the resonant frequency is 160 Hz. Similarly, the second power generation sensitivity is calculated for the second vibration power generation device 1b when the resonant frequency is one of the multiple second peak frequencies. That is, here, the second power generation sensitivity is calculated for the cases where the resonant frequency is 54 Hz, where the resonant frequency is 107 Hz, and where the resonant frequency is 160 Hz.

In this way, in step S41, three first power generation sensitivities and three second power generation sensitivities are calculated.

Next, in the second calculation step, the calculation unit 112 calculates multiple (three) generated voltages for the first vibration power generation device 1, as in step S50, and here also calculates multiple (three) generated voltages for the second vibration power generation device 1b (S51).

The calculation unit 112 calculates the generated voltage at each of the multiple second peak frequencies by multiplying each of the multiple calculated second power generation sensitivities by the physical quantity (here, acceleration) of the second peak frequency indicating the calculated second power generation sensitivity. More specifically, the generated voltage of the second vibration power generation device 1b is calculated when the resonant frequency of the second vibration power generation device 1b is 54 Hz, 107 Hz, and 160 Hz.

In this way, in step S51, the calculation unit 112 calculates multiple (three) generated voltages for the first vibration power generation device 1 and multiple (three) generated voltages for the second vibration power generation device 1b. In other words, the calculation unit 112 calculates six generated voltages.

Next, in the determination step, the determination unit 113 determines a maximum peak frequency, which is the first peak frequency or the second peak frequency that indicates the largest value among the multiple generated voltages calculated for the first vibration power generation device 1 and the multiple generated voltages calculated for the second vibration power generation device 1b (S61).

For example, when the resonant frequency of the first vibration power generation device 1 is 160 Hz and the generated voltage of the first vibration power generation device 1 is the largest value among the six generated voltages, the determination unit 113 determines the first peak frequency, 160 Hz, as the maximum peak frequency. Hereinafter, the condition under which the first peak frequency, 160 Hz, is determined as the maximum peak frequency is referred to as condition 1.

Similarly, for example, when the resonant frequency of the second vibration power generation device 1b is 54 Hz and the generated voltage of the second vibration power generation device 1b is the largest value among the six generated voltages, the determination unit 113 determines the second peak frequency, 54 Hz, as the maximum peak frequency. Hereinafter, the condition under which the second peak frequency, 54 Hz, is determined as the maximum peak frequency is referred to as condition 2.

Furthermore, in the third calculation step, the calculation unit 112 calculates the mass of the first weight 60 or the mass of the second weight 60b corresponding to the determined maximum peak frequency based on the determined maximum peak frequency and the acquired first mass function or second mass function (S71).

The above condition 1 also applies when the generated voltage of the first vibration power generation device 1 is the largest of the six generated voltages. In this case, the mass of the first weight 60 corresponding to the maximum peak frequency is calculated based on the first peak frequency (160 Hz), which is the maximum peak frequency, and the first mass function related to the first vibration power generation device 1. Note that the same process is performed when another first peak frequency is determined as the maximum peak frequency.

The above condition 2 also applies when the generated voltage of the second vibration power generation device 1b is the largest of the six generated voltages. In this case, the mass of the second weight 60b corresponding to the maximum peak frequency is calculated based on the second peak frequency (54 Hz), which is the maximum peak frequency, and the second mass function related to the second vibration power generation device 1b. Note that the same process is performed when another second peak frequency is determined as the maximum peak frequency.

Next, in the output step, the output unit 114 outputs information indicating the determined maximum peak frequency, the calculated mass of the first weight 60 or the mass of the second weight 60b, and which of the first vibration power generation device 1 and the second vibration power generation device 1b exhibits the determined maximum peak frequency (S81). Note that the calculated mass of the first weight 60 or the mass of the second weight 60b is the mass of the first weight 60 or the mass of the second weight 60b that corresponds to the maximum peak frequency determined by the determination unit 113.

For example, when the above condition 1 is met, the output is the first peak frequency (160 Hz), which is the maximum peak frequency, the mass of the first weight 60 corresponding to the maximum peak frequency, and information indicating that the vibration power generation device exhibiting the maximum peak frequency is the first vibration power generation device 1.

For example, when the above condition 2 is met, the output includes the second peak frequency (54 Hz), which is the maximum peak frequency, the mass of the second weight 60b corresponding to the maximum peak frequency, and information indicating that the vibration power generation device exhibiting the maximum peak frequency is the second vibration power generation device 1b.

By performing the processing of step S81, an image showing the determined maximum peak frequency, the mass of the first weight 60 or the mass of the second weight 60b, and the vibration power generation device with the higher generated voltage is displayed on the display unit 151.

This allows the user to select a vibration power generation device that generates a higher voltage and use the first weight 60 or the second weight 60b with a mass that results in the maximum peak frequency of the vibration power generation device.

In this modified example, the devices targeted by the selection device 100 are only the first vibration power generation device 1 and the second vibration power generation device 1b, but this is not limited to this. The selection device 100 may target three or more vibration power generation devices of different sizes. The selection device 100 can select the device with the higher generated voltage from the three or more vibration power generation devices by performing the same process as in the above operation example 2.

[Effects, etc.]
The selection method according to this modification is a selection method by the selection device 100 of the first vibration power generation device 1 and the second vibration power generation device 1b that includes the second weight 60b and is different from the first vibration power generation device 1. In the first acquisition step, a second sensitivity function is acquired that indicates the dependency of the second power generation sensitivity, which is obtained by dividing the generated voltage when the second vibration power generation device 1b is vibrated by the physical amount, on the resonance frequency of the second vibration power generation device 1b. In the second acquisition step, a second mass function is acquired that indicates the dependency of the mass of the second weight 60b on the resonance frequency of the second vibration power generation device 1b. In the third acquisition step, a second spectrum of the physical amount related to the displacement of the position of the vibration source device 2 is acquired. In the first calculation step, a second power generation sensitivity corresponding to each of the multiple second peak frequencies is calculated based on each of the multiple second peak frequencies included in the acquired second spectrum and the acquired second sensitivity function. In the second calculation step, a generated voltage at each of the multiple second peak frequencies is calculated by multiplying each of the calculated multiple second power generation sensitivities by the physical amount of the second peak frequency indicating the calculated second power generation sensitivity. In the determination step, a maximum peak frequency is determined as the first peak frequency or the second peak frequency that indicates the largest value among the multiple generated voltages calculated for the first vibration power generation device 1 and the multiple generated voltages calculated for the second vibration power generation device 1b. In the third calculation step, the mass of the first weight 60 or the mass of the second weight 60b that corresponds to the determined maximum peak frequency is calculated based on the determined maximum peak frequency and the acquired first mass function or the second mass function. In the output step, information indicating the determined maximum peak frequency, the calculated mass of the first weight 60 or the mass of the second weight 60b that corresponds to the determined maximum peak frequency, and which of the first vibration power generation device 1 and the second vibration power generation device 1b indicates the determined maximum peak frequency is output.

This allows the user to select a vibration power generation device that generates a higher voltage and use the first weight 60 or the second weight 60b with a mass that will give the vibration power generation device a maximum peak frequency. In other words, a selection method is realized that allows the user to easily select a resonance frequency that can increase the generated voltage, the mass of the first weight 60 or the second weight 60b, and a vibration power generation device.

(Other embodiments)
Although the vibration power generation device according to the present invention has been described above based on the embodiment and the modified examples, the present invention is not limited to these embodiment and modified examples. As long as it does not deviate from the gist of the present invention, various modifications conceivable by a person skilled in the art to the embodiment and other forms constructed by combining some of the components in the embodiment and modified examples are also included in the scope of the present invention.

The selection device 100 may be a server device such as a cloud server. In this case, the selection device 100 does not need to include the sensor unit 130, and the sensor unit 130 may be separate from the selection device 100. In this case, the first spectrum shown in FIG. 6 obtained by the sensor unit 130 may be output to the selection device 100. This allows the selection device 100 to obtain the first spectrum shown in FIG. 6.

The resonant frequency described in the embodiment and the modified example is the primary resonant frequency, but is not limited to this. A secondary resonant frequency may be used instead of the primary resonant frequency, or a higher-order resonant frequency may be used.

Furthermore, the above embodiment may be modified, substituted, added, omitted, etc. in various ways within the scope of the claims or their equivalents.

The present invention can be used as a method for selecting a vibration power generation device that can increase the generated voltage.

1, 1a First vibration power generation device 1b Second vibration power generation device 2 Vibration source device 21, 21a, 21b Frame 22 Connecting member 30, 30a Power generation unit 31, 31a Coil 32, 32a Magnetostrictor 33 Power generation magnet 60, 60a First weight 60b Second weight 100 Selection device 110 Information processing unit 111 Acquisition unit 112 Calculation unit 113 Determination unit 114 Output unit 120 Communication unit 130 Sensor unit 131 Acceleration sensor 132 Sensor control unit 140 Memory unit 150 Display device 151 Display unit 152 Reception unit 211 First inner surface 212 Second inner surface 213 First outer surface 214 Second outer surface 1111 First acquisition unit 1112 Second acquisition unit 1113 Third acquisition unit 1121 First calculation unit 1122 Second calculation unit 1123 Third calculation section A1, A2 Area B Bend section d1, d2 Thickness F1 Free end F2, F2a Fixed end L1, L2 Total length

Claims (7)

A selection method for a first vibration power generation device including a first weight, the selection method comprising:
a first acquisition step of acquiring a first sensitivity function indicating a dependency of a first power generation sensitivity on a resonance frequency, the first sensitivity function being obtained by dividing a generated voltage by a physical quantity when the first vibration power generation device is vibrated;
a second obtaining step of obtaining a first mass function indicating a dependency of a mass of the first weight on the resonant frequency;
a third acquisition step of acquiring a first spectrum of the physical quantity related to a displacement of a position of the vibration source device;
a first calculation step of calculating the first power generation sensitivity corresponding to each of a plurality of first peak frequencies based on each of a plurality of first peak frequencies included in the acquired first spectrum and the acquired first sensitivity function;
a second calculation step of multiplying each of the calculated first power generation sensitivities by the physical quantity of the first peak frequency indicating the calculated first power generation sensitivities, to calculate a generated voltage at each of the multiple first peak frequencies;
a determination step of determining the first peak frequency that has the largest value among the calculated multiple generated voltages;
a third calculation step of calculating a mass of the first weight corresponding to the determined first peak frequency based on the determined first peak frequency and the acquired first mass function;
an output step of outputting the determined first peak frequency and the calculated mass of the first weight;
Includes selection methodology. The selection method according to claim 1 , wherein the physical quantity is acceleration. The selection method according to claim 1 , wherein the acquired first sensitivity function is a function calculated by a finite element method. The selection method according to claim 1 , wherein the first spectrum of the physical quantity is a sum of a plurality of spectra based on the physical quantity from a first time to a second time that is later than the first time. The selection method is a method for selecting, by the selection device, the first vibration power generation device and a second vibration power generation device that includes a second weight and is different from the first vibration power generation device,
In the first acquisition step, a second sensitivity function is acquired that indicates a dependency of a second power generation sensitivity, which is obtained by dividing a generated voltage when the second vibration power generation device is vibrated by the physical quantity, on a resonance frequency of the second vibration power generation device;
In the second obtaining step, a second mass function is obtained that indicates a dependency of a mass of the second weight on the resonant frequency of the second vibration power generation device;
In the third acquisition step, a second spectrum of the physical quantity related to a displacement of a position of the vibration source device is acquired,
In the first calculation step, the second power generation sensitivity corresponding to each of the plurality of second peak frequencies is calculated based on each of the plurality of second peak frequencies included in the acquired second spectrum and the acquired second sensitivity function,
In the second calculation step, a generated voltage at each of the plurality of second peak frequencies is calculated by multiplying each of the calculated plurality of second power generation sensitivities by the physical quantity of the second peak frequency indicating the calculated second power generation sensitivities,
In the determination step, a maximum peak frequency is determined, which is the first peak frequency or the second peak frequency that indicates a largest value among the plurality of generated voltages calculated for the first vibration power generation device and the plurality of generated voltages calculated for the second vibration power generation device,
In the third calculation step, a mass of the first weight or a mass of the second weight corresponding to the determined maximum peak frequency is calculated based on the determined maximum peak frequency and the acquired first mass function or the acquired second mass function;
2. The selection method according to claim 1, wherein the output step outputs information indicating the determined maximum peak frequency, the calculated mass of the first weight or the mass of the second weight corresponding to the determined maximum peak frequency, and which of the first vibration power generation device and the second vibration power generation device exhibits the determined maximum peak frequency. A computer program for causing a computer to execute the selection method according to any one of claims 1 to 5. A selection device for a first vibration power generation device including a first weight,
a first acquisition unit that acquires a first sensitivity function that indicates a dependency of a first power generation sensitivity on a resonance frequency, the first sensitivity function being obtained by dividing a generated voltage by a physical quantity when the first vibration power generation device is vibrated;
a second acquisition unit that acquires a first mass function indicating a dependency of a mass of the first weight on the resonant frequency;
A third acquisition unit that acquires a first spectrum of the physical quantity related to a displacement of a position of the vibration source device;
a first calculation unit that calculates the first power generation sensitivity corresponding to each of a plurality of first peak frequencies based on each of a plurality of first peak frequencies included in the acquired first spectrum and the acquired first sensitivity function;
a second calculation unit that calculates a generated voltage at each of the plurality of first peak frequencies by multiplying each of the calculated plurality of first power generation sensitivities by the physical quantity of the first peak frequency indicating the calculated first power generation sensitivities;
a determination unit that determines the first peak frequency that indicates the largest value among the calculated plurality of generated voltages;
a third calculation unit that calculates a mass of the first weight corresponding to the determined first peak frequency based on the determined first peak frequency and the acquired first mass function;
an output unit that outputs the determined first peak frequency and the calculated mass of the first weight;
A selection device.

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