JP7077262B2 - Rotating shaft twist amount measuring device and twist amount measuring method - Google Patents

Description

The present disclosure relates to a method for measuring the amount of twist generated in a rotating shaft during rotation.

Conventionally, various methods and devices for measuring rotation angle fluctuations (hereinafter referred to as torsional vibrations) have been proposed as torsional vibration meters for rotating shafts (for example, Patent Documents 1 and 2). In Patent Document 1, a striped reflective tape at regular intervals is attached to a rotating body, and a striped pulse signal during rotation is detected by a sensor. When torsional vibration occurs in the rotating body, the detection time interval of the fringe pulse signal, which is originally detected at a uniform time interval (= angular interval), fluctuates. This fluctuation is converted into a rotation angle fluctuation by using a rotation signal obtained from a sensor that detects a target of one pulse in one rotation.

Japanese Unexamined Patent Publication No. 6-307922 Japanese Unexamined Patent Publication No. 3-78642

However, the method described in Patent Document 1 is intended to measure torsional vibration, and although torsional vibration can be measured, the rotating shaft is in a twisted state while maintaining a constant angle due to rotational torque. The twist angle (hereinafter referred to as the average twist angle) cannot be measured. Further, when it is desired to measure the average torsion angle and the torsional vibration amount at the same time, a method of measuring both with a simple configuration is desired.

In view of the above circumstances, at least one embodiment of the present invention aims to provide a rotation shaft torsion amount measuring device capable of measuring an average torsion angle generated in a rotation shaft during rotation.

(1) The rotating shaft torsion amount measuring device according to at least one embodiment of the present invention is
A rotary shaft torsion amount measuring device for calculating an average torsion angle generated during rotation of a rotary shaft connecting a drive source and a driven body driven by the drive source.
First data configured to acquire first time-series data, which is output data of the first sensor that detects the first target portion provided on the outer peripheral surface of the rotating shaft once for each rotation of the rotating shaft. Acquisition department and
With the first time-series data of the second sensor that detects the second target portion provided on the driven body side of the first target portion on the outer peripheral surface of the rotation shaft once for each rotation. A second data acquisition unit configured to acquire second time series data including output data at the same time, and
A unit including an average helix angle calculation unit configured to calculate the average helix angle generated on the rotation axis during rotation based on the acquired first time-series data and the second time-series data.
The average helix angle calculation unit is
The reference time-series data including the first time-series data and the second time-series data when the rotation axis is rotated at the first speed at which the average twist does not occur on the rotation axis, and the average twist on the rotation axis. The average twist angle is calculated based on the first time-series data and the target time-series data including the second time-series data when the rotation axis is rotated at the second speed at which the above occurs.

According to the configuration of (1) above, the first target is on the side relatively close to the drive source side of the rotating shaft that transmits the power of the drive source (for example, an engine) to the driven body (for example, a generator). A second target portion is provided on the side relatively close to the driven body. Further, each of the first sensor and the second sensor is fixed so as not to rotate with the rotation axis while facing the rotation axis at the axial position on the rotation axis provided with the first target portion and the second target portion, respectively. It is possible to acquire the first time-series data and the second time-series data through sensing at the same time when the rotating shaft is rotated.

Then, in such a measurement system, the above-mentioned first time-series data and second time-series data are in a state where the average twist does not occur in the rotation axis (reference time-series data), and the average twist occurs in the rotation axis. The average twist angle is calculated based on the reference time-series data and the target time-series data acquired by sensing each of the existing states (target time-series data).

Here, since the first target portion and the second target portion are partially provided at different axial positions on the rotation axis, each of the above time-series data includes once for each rotation. The detection timing of each detected target portion is intermittently shown on the time axis. Therefore, for example, if we look at where the detection timing of the second target portion included in the second time-series data is located between the detection timings of the two adjacent first target portions included in the first time-series data. Since one rotation is 360 degrees, a relative positional relationship in the circumferential direction of the rotation axis of the second target portion with respect to the first target portion can be obtained. That is, by obtaining the timing at which the second target portion is detected during one rotation of the first target portion, it is relative in the circumferential direction of the second target portion when the first target portion is used as a reference. The position (angle) can be obtained.

Therefore, for example, the relative position of the second target part with respect to the first target part when there is no average twist on the rotation axis from the reference time series data, and the first when the average twist occurs on the rotation axis from the target time series data. The average twist angle generated when the rotation axis rotates can be easily calculated based on the reference time series data and the target time series data, such as by comparing with the relative position of the second target portion with respect to the target portion.

(2) In some embodiments, in the configuration of (1) above,
The average helix angle calculation unit is
The same time axis of the detection position of the second target portion in the second time series data between the detection positions of the two first target portions adjacent to each other on the time axis in the first time series data. It has an angular position calculation unit that calculates the angular position of the second target unit with respect to the first target unit in the circumferential direction of the rotation axis based on the relative position on the top.
The average helix angle is calculated based on the difference between the angle position calculated based on the reference time series data and the angle position calculated based on the target time series data.

According to the configuration of (2) above, where is the detection timing of the second target portion included in the second time series data between the detection timings of the two adjacent first target portions included in the first time series data? The angle position indicating whether to do is calculated for each of the reference time series data and the target time series data. Thereby, for example, the average helix angle can be calculated by subtracting the angle position calculated based on the reference time series data from the angle position calculated based on the target time series data.

(3) In some embodiments, in the configurations (1) to (2) above,
A third time series in which a plurality of third target portions provided on the outer peripheral surface of the rotating shaft at intervals along the circumferential direction of the rotating shaft are intermittently and sequentially detected according to the rotation of the rotating shaft. A third data acquisition unit configured to acquire data,
Further, a torsional vibration amount calculation unit for calculating a torsional vibration amount based on the third time series data is provided.

According to the configuration of (3) above, the twist is based on the third time series data including the detection signals of a plurality of third targets provided at intervals along the circumferential direction on the outer peripheral surface of the rotating shaft. Calculate the amount of vibration. As a result, the average helix angle and the torsional vibration amount can be measured at the same time.

(4) In some embodiments, in the configuration of (3) above,
The plurality of third target portions are provided adjacent to the second target portion in the circumferential direction at the axial position of the rotation axis where the second target portion is provided.
The second time-series data is obtained by intermittently and sequentially detecting the second target unit and the plurality of third target units by the second sensor for each rotation of the rotation axis. Contains series data,
The torsional vibration amount calculation unit calculates the torsional vibration amount based on the third time-series data included in the second time-series data.

According to the configuration of (4) above, the plurality of third target portions and the second target portions are provided side by side along the circumferential direction of the rotation axis at the same axial position on the rotation axis, and are provided by the second sensor. The obtained second time-series data includes intermittent detection signals of each of the plurality of third target portions and the second target portion. As a result, the torsional vibration amount can be measured by a simple configuration using one sensor without separately providing a sensor for obtaining the third time series data.

(5) In some embodiments, in the configuration of (4) above,
The plurality of third target portions have lengths in the circumferential direction that are the same as each other, and are arranged so as to be equidistant from each other along the circumferential direction.
The circumferential length of each of the plurality of third target portions is different from the circumferential length of the second target portion.

According to the configuration of (5) above, the detection signals of the second target portion provided along the circumferential direction at the same axial position on the rotation axis and each third target portion are in the respective circumferential directions. By making the lengths different, the shape of the detection signal in the second time-series data is changed, so that the discrimination can be made. Thereby, in the second time series data, the detection signal of the second target portion and the detection signal of the plurality of third target portions can be easily distinguished.

(6) In some embodiments, in the configurations (3) to (5) above,
The torsional vibration amount calculation unit includes the third time-series data when the rotation shaft is rotated at the first speed and the third time-series data when the rotation shaft is rotated at the second speed. The torsional vibration amount is calculated based on the comparison of.

According to the configuration of (6) above, even if there is a tolerance in the shape of the third target portion, the third time series measured in the case where the rotation axis is twisted and the case where the twist is not generated, respectively. Based on the data, the torsional vibration amount can be measured accurately.

(7) In some embodiments, in the configurations (1) to (6) above,
The rotating shaft includes an output shaft of the driving source, an input shaft for inputting rotation of the output shaft to the driven body, and a joint for connecting the output shaft and the input shaft. Ori,
The first target unit is provided on the output shaft and is provided on the output shaft.
The second target portion is provided on the input shaft.

According to the configuration of (7) above, the rotating shaft includes an output shaft of a drive source such as an engine output shaft (crank shaft) and an input shaft of a driven body including a joint such as an elastic body joint. Will be done. When there is a joint, unlike the case where the rotating shaft is a rigid body, the average twist is more likely to occur, and the average twist in such a case can be measured.

(8) In some embodiments, in the configurations (1) to (7) above,
The drive source is an engine.
The driven body is a generator.
According to the configuration of (8) above, the average torsion angle and the torsional vibration amount in the rotating shaft connecting the engine and the generator can be measured.

(9) The method for measuring the amount of twist of the rotating shaft according to at least one embodiment of the present invention is
A rotary shaft torsion amount measuring device for calculating an average torsion angle generated during rotation of a rotary shaft connecting a drive source and a driven body driven by the drive source.
The first data acquisition step of acquiring the first time-series data which is the output data of the first sensor that detects the first target portion provided on the outer peripheral surface of the rotating shaft once for each rotation of the rotating shaft.
With the first time-series data of the second sensor that detects the second target portion provided on the driven body side of the first target portion on the outer peripheral surface of the rotation shaft once for each rotation. The second data acquisition step to acquire the second time series data including the output data at the same time, and
Based on the acquired first time-series data and the second time-series data, the average twist angle calculation step for calculating the average twist angle generated on the rotation axis during the rotation is provided.
The average helix angle calculation step is
The reference time-series data including the first time-series data and the second time-series data when the rotation axis is rotated at the first speed at which the average twist does not occur on the rotation axis, and the average twist on the rotation axis. The average twist angle is calculated based on the first time-series data and the target time-series data including the second time-series data when the rotation axis is rotated at the second speed at which the above occurs.
According to the configuration of the above (9), the same effect as the above (1) is obtained.

According to at least one embodiment of the present invention, there is provided a rotary shaft torsion amount measuring device capable of measuring an average torsion angle generated in a rotary shaft during rotation.

It is a figure which shows schematically the measurement system which includes the twist amount measuring apparatus of the rotating shaft which concerns on one Embodiment of this invention. It is a figure which shows the striped reflective tape which includes the 2nd target part which concerns on one Embodiment of this invention. It is a figure which shows the functional block of the twist amount measuring apparatus of the rotating shaft which concerns on one Embodiment of this invention. The first time-series data and the second time-series data obtained by (a) sensing the rotation axis of the first speed and (b) sensing the rotation axis of the second speed according to one embodiment of the invention. It is a figure which shows the 1st time series data and the 2nd time series data. It is a figure which shows the angular position of the 2nd target part with respect to the 1st target part corresponding to FIG. It is a figure which shows the twist amount measuring method which concerns on one Embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. do not have.
For example, expressions that represent relative or absolute arrangements such as "in one direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a tolerance or a state of relative displacement at an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, an expression representing a shape such as a square shape or a cylindrical shape not only represents a shape such as a square shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfering within a range where the same effect can be obtained. It shall also represent the shape including the part and the like.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions excluding the existence of other components.

FIG. 1 is a diagram schematically showing a measurement system including a torsion amount measuring device 1 according to an embodiment of the present invention. Further, FIG. 2 is a diagram showing a striped reflective tape T including a second target portion 92 according to an embodiment of the present invention.

The torsion amount measuring device 1 (hereinafter, simply, the twist amount measuring device 1) is a rotating shaft 8 connecting a drive source 71 and a driven body 72 driven by the drive source 71, as shown in FIG. It is a device for measuring a torsion amount (twist angle) which is an average torsion angle generated at the time of rotation by a rotation torque of a drive source 71 or a torsion vibration amount. On the outer peripheral surface of the rotating shaft 8 to be measured, a plurality of (plural types) target portions (91 to 93) sensed by sensors (S1 to S2) when the rotating shaft 8 is rotated are provided. Further, a plurality of sensors S for sensing the rotating shaft 8 are installed at positions in the axial direction (hereinafter referred to as axial positions) of the rotating shaft 8 where each target portion is located. Then, the twist amount measuring device 1 measures the twist amount generated in the rotary shaft 8 based on the time series data D (time transition data) output from each sensor that executes sensing when the rotary shaft 8 rotates. do.

Specifically, as shown in FIG. 1, the first target portion 91 is provided on the relative drive source 71 side of the rotating shaft 8, and the second target portion 92 is relatively on the driven body 72 side. It will be provided. Each of these target portions is partially provided along the circumferential direction of the outer peripheral surface of the rotating shaft 8. Further, the first sensor S1 for detecting the first target unit 91 and the second sensor S2 for detecting the second target unit 92 are the outer periphery of the rotating shaft 8 at the axial position where each target unit 9 is located. It is fixedly installed by a jig (not shown) that does not rotate together with the rotating shaft 8 so as to face the surface. That is, each sensor (S1 to S2) is set so that the first target unit 91 and the second target unit 92, which rotate together with the rotation shaft 8, are detected once for each rotation of the rotation shaft 8. To. Then, the signal values of the detection signals (pulse signals) obtained by executing the sensing by each of these sensors are sequentially recorded together with the detection time of the detected values according to the passage of time, so that the above time series data (D1 to D2) are recorded. (See FIG. 4 described later) is obtained.

The embodiment shown in FIG. 1 will be described. The drive source 71 is an engine, and the driven body 72 is a generator. Further, the rotary shaft 8 includes an output shaft 81 (crank shaft) of the engine, an input shaft 82 that rotates together with the output shaft 81 and inputs the rotation (rotary power) of the output shaft 81 to the generator, and the above output shaft. It is composed of a joint 83 that connects the 81 and the input shaft 82. The joint 83 is an elastic joint for dampening the vibration of the engine transmitted to the generator via the rotary shaft 8, and the output shaft 81 and the input shaft 82 are joints containing an elastic body such as rubber or a spring. It is connected via 83. The first target unit 91 is provided on the output shaft 81 of the engine (drive source 71), and the second target unit 92 is provided on the input shaft 82 of the generator (driven body 72).

Further, the first target portion 91 is formed by a protrusion portion protruding from the outer surface of the rotating shaft 8. The first sensor S1 for detecting the first target unit 91 is an eddy current displacement sensor, and by measuring the change in the distance (gap) between the metal surface and the sensor, the first target unit 91 Is detected. Therefore, if the time-series data obtained from the first sensor S1 is called the first time-series data D1, the first target unit 91 is detected once for each rotation of the rotation axis 8, so that the first time-series When the data D1 is represented in a graph, as shown in FIGS. 4A and 4B described later, the detection signal Sa of the first target unit 91 appears intermittently with the passage of time. Therefore, the timing of each rotation of the first target unit 91 that rotates together with the rotation shaft 8 can be grasped from the appearance timing of the detection signal Sa.

On the other hand, the second target portion 92 is formed of a part of a striped reflective tape (hereinafter, striped reflective tape T) attached along the circumferential direction on the outer peripheral surface of the rotating shaft 8. In the present embodiment, the striped reflective tape T is attached to the flange 82f for connecting the input shaft 82 of the driven body 72 and the joint 83, but other parts of the rotating shaft 8 may be used. As shown in FIG. 2, on the surface of the striped reflective tape T, a reflective portion Tw (white portion) and a non-reflective portion Tb (black portion) whose reflectance is much lower than that of the reflective portion Tw are formed. It is provided alternately. In other words, the striped reflective tape T has an arbitrary plurality of reflective portions Tw and an arbitrary plurality of non-reflective portions Tb. Then, one of the plurality of non-reflective portions Tb has a longer length (circumferential direction length) along the circumferential direction of the rotation axis 8 than the other non-reflective portion Tb (third target portion 93 described later). Has been done. Assuming that the circumferential length of the non-reflective portion Tb forming the second target portion 92 is L2 and the circumferential length of the other non-reflective portion Tb is L3, L2> L3. The second target portion 92 is formed by the non-reflective portion Tb having the longest circumferential length.

The second sensor S2 for detecting the second target unit 92 is composed of a photoelectric sensor, a laser sensor, or the like, and changes in the amount of reflected light of the irradiated light (visible light, infrared rays, laser). The second target unit 92 is detected. Therefore, if the time-series data D obtained from the second sensor S2 is referred to as the second time-series data D2, as shown in FIGS. 4A and 4B described later, the second time-series data The graph of D2 includes a detection signal (pulse signal) in which a plurality of reflection portions Tw are sequentially detected along a time axis. The detection signals Sc of each of the plurality of reflection portions Tw are arranged at equal intervals except for the second target portion 92, but at the reflection portions Tw on both sides of the second target portion 92, the intervals are different from the other intervals. Since (unequal intervals), the second target unit 92 is detected by the unequal intervals. Further, when focusing only on the detection signal Sb of the second target unit 92 in the second time series data D2, the second target unit 92 is detected once for each rotation of the rotation shaft 8, so that the detection signal Sb is It will appear intermittently over time. Therefore, the timing of each rotation of the second target portion 92 that rotates together with the rotation shaft 8 can be grasped by the appearance timing of the unequal intervals.

However, the present invention is not limited to the embodiments shown in FIGS. 1 and 2. In the above-described embodiment, the second target portion 92 is formed of one of the non-reflective portions Tb in the striped reflective tape T, but the circumferential length of one of the reflective portions Tw is made longer than the other. It may be formed by the above. In this case, since the shape (waveform) of the detection signal is different between the second target unit 92 and the other reflection unit Tw, the detection signal Sb of the second target unit 92 is distinguished from the detection signals of the other reflection unit Tw. It is possible. Alternatively, in some other embodiments, a reflective tape in which only the second target portion 92 is formed may be used instead of the striped reflective tape T. That is, at the axial position of the rotating shaft 8 provided with the second target portion 92, the reflectance of other outer peripheral surfaces along the circumferential direction of the rotating shaft 8 may be the same. Further, it is not necessary to use a reflective tape, and the reflectance of a part of the surface along the circumferential direction at the axial position is made different from the reflectance of the other part by another method, so that the second target A part 92 may be provided.

Further, regarding the above-mentioned first sensor S1, the first sensor S1 may be a photoelectric sensor, a laser sensor, or the like. In this case, the reflectance of the outer peripheral surface of the first target portion 91 facing the first sensor S1 is changed from that of the other portion including the outer peripheral surface along the circumferential direction at the axial position thereof. The first target unit 91 is detected. At this time, the first target portion 91 does not have to be a protruding portion, and may be a reflective tape capable of having a reflectance different from that of other portions. Since the eddy current displacement sensor is not affected by dirt and the like, it is robust in terms of environmental resistance, but on the other hand, the detection part needs to be mainly made of metal, and the object to which the detection object is attached is a rotating body, and the attachment freedom is not high. On the other hand, photoelectric sensors, etc. have a high degree of freedom in mounting because the detected object can be attached by attaching reflective tape, etc., and while it is easy to construct a measurement system, they are vulnerable to dirt, etc., so they can be used in a clean environment. Maintenance etc. is required.

Further, the second target portion 92 may be, for example, a protrusion similar to that described above. Alternatively, the second target portion 92 is a detection object installed at regular intervals on the outer periphery of the rotating shaft 8, such as a plurality of bolts 82b provided at equal intervals with each other for fixing the flange 82f to the joint 83. It may be formed by removing one of them. Thereby, as in FIG. 4 described later, it is possible to form a portion where the detection signals of the bolts 82b are unequally spaced. Further, by changing the shape of one of the plurality of detected objects installed on the outer circumference of the rotating shaft 8 at regular intervals from the other, the shape of the detection signal by the second sensor S2 can be changed from the other. May be. The second sensor S2 may also be any of a photoelectric sensor, a laser sensor, an eddy current displacement sensor, and the like that can detect the second target unit 92, depending on the form of the second target unit 92.

Then, the twist amount measuring device 1 is obtained by performing sensing by the first sensor S1 and the second sensor S2 in a state where the rotating shaft 8 is rotated by the drive source 71 in the measurement system as described above. Based on the time series data D1 and the second time series data D2, the average twist angle is measured as follows.

Hereinafter, the twist amount measuring device 1 will be described with reference to FIGS. 3 to 6. FIG. 3 is a diagram showing a functional block of a torsion amount measuring device for a rotating shaft according to an embodiment of the present invention. FIG. 4 shows the first time-series data D1a and the second time-series data D2a obtained by sensing the rotation axis 8 of the first speed according to the embodiment of the present invention, and (b) the second speed. It is a figure which shows the 1st time series data D1b and the 2nd time series data D2b obtained by sensing with respect to the rotation axis 8. FIG. 5 is a diagram showing the angular position of the second target portion 92 with respect to the first target portion 91 corresponding to FIG.

As shown in FIG. 3, the twist amount measuring device 1 includes a first data acquisition unit 21, a second data acquisition unit 22, and an average helix angle calculation unit 3. Each of these functional portions will be described by taking the case where the second target portion 92 is provided by a part of the above-mentioned striped reflective tape T (see FIG. 2) as an example.

In each graph of FIG. 4, each target portion is detected at the time position where the signal level is rising, but the signal level at that time is the portion on the outer peripheral surface of the rotating shaft 8 where the target portion does not exist. It is described based on the signal level. Further, in FIG. 4, for the sake of simplification, a wavy (rectangular) pulse signal is shown linearly.

Further, the twist amount measuring device 1 may be configured by, for example, a computer. The computer includes a CPU (processor) (not shown) and memories such as ROM and RAM. Further, an external storage device may be provided. Then, the CPU operates (data calculation, etc.) according to the instruction of the program (twist amount measurement program) loaded in the main storage device, and operates.

The first data acquisition unit 21 is a functional unit configured to acquire the above-mentioned first time-series data D1 which is the output data of the above-mentioned first sensor S1. As described above, the first sensor S1 is a sensor installed so as to detect the first target portion 91 partially provided on the outer peripheral surface of the rotating shaft 8 once for each rotation of the rotating shaft 8. .. Since the first target unit 91 is detected once for each rotation of the rotation shaft 8 by the first sensor S1, the first target unit 91 is once (360 degrees) from the first time series data D1. The timing can be grasped.

The second data acquisition unit 22 is a functional unit configured to acquire the above-mentioned second time-series data D2, which is the output data of the above-mentioned second sensor S2. As described above, the second sensor S2 visits the second target portion 92 partially provided on the driven body 72 side of the first target portion 91 on the outer peripheral surface of the rotation shaft 8 once per rotation. It is a sensor installed to detect. Further, the second time-series data D2 acquired by the second data acquisition unit 22 is obtained by, for example, simultaneously performing sensing with the first sensor S1 and the second sensor S2, and is obtained with the first time-series data D1. Includes output data at the same time. In the present embodiment, the second target portion 92 corresponds to the case where the second target portion 92 is formed of one non-reflective portion Tb having the longest circumferential length L in the striped reflective tape T, so that the second target portion 92 is used. , Detected between the reflective portions Tw on both sides of the second target portion 92. Specifically, the second target portion 92 is detected depending on where the distance between the two adjacent reflection portions Tw is the longest.

The average twist angle calculation unit 3 is a rotation axis during rotation based on the first time series data D1 and the second time series data D2 acquired by the first data acquisition unit 21 and the second data acquisition unit 22 described above, respectively. It is a functional unit configured to calculate the average twist angle generated in 8. Specifically, the average twist angle calculation unit 3 outputs the first hour output from each sensor when the rotary shaft 8 is rotated at a speed at which the average twist does not occur in the rotary shaft 8 (hereinafter referred to as the first speed Va). It was output from each sensor when the rotation axis was rotated at the reference time-series data Gr including the series data D1a and the second time-series data D2a and the speed at which the average twist occurs in the rotation axis 8 (hereinafter referred to as the second speed Vb). The average twist angle is calculated based on the target time-series data Gt including the first time-series data D1b and the second time-series data D2b. For example, the first speed Va (rotational speed) is the speed at the time of extremely low rotation, and the second speed Vb is the speed at the time of high speed rotation (Va <Vb). Then, the calculated average helix angle is output to the display 12.

In the embodiment shown in FIG. 3, the average twist angle calculation unit 3 is the second time-series data between the detection positions of the two first target units 91 adjacent to each other on the time axis in the first time-series data D1. An angular position for calculating the angular position of the second target unit 92 with respect to the first target unit 91 in the circumferential direction of the rotation axis 8 based on the relative position of the detection position of the second target unit 92 in D2 on the same time axis. It has a calculation unit 32. Then, the average helix angle is calculated based on the difference between the angle position (θr) calculated based on the above-mentioned reference time-series data Gr and the angle position (θt) calculated based on the target time-series data Gt. do.

That is, as shown in FIG. 4, the angle position calculation unit 32 detects the detection position of the second target unit 92 when the first time-series data D1 and the second time-series data D2 are overlapped with each other on the time axis. However, the position relative to the detection positions of the two first target units 91 located so as to sandwich this position is calculated. That is, assuming that the detection cycle of the first target unit 91 is Tp and the elapsed time from the detection signal Sa of the first target unit 91 to the detection signal Sb of the second target unit 92 is Te, the angular position is as shown in FIG. Is Te ÷ Tp × 360 (degrees). The angle position calculated in this way corresponds to the angle in the circumferential direction of the second target portion 92 with respect to one rotation (360 degrees) of the first target portion 91.

Then, if the calculation of this angle position is calculated for the reference time-series data Gr and the target time-series data Gt, respectively, the average twist of the second target unit 92 with respect to the rotation axis 8 with respect to the first target unit 91 is obtained. Both the angular position (θr. See FIG. 5A) and the angular position (θt. See FIG. 5B) when the rotation axis 8 is twisted are obtained. That is, it means that the angle position has changed from θr to θt due to the occurrence of the average twist on the rotating shaft 8, so that the average twist angle calculation unit 3 calculates the average twist angle by θr−θt. In this way, the average helix angle is calculated. In FIG. 5, θr + θ2 = 360 degrees and θt + θ2 ′ = 360 degrees.

According to the above configuration, the rotating shaft 8 that transmits the power of the drive source 71 (for example, an engine or the like) to the driven body 72 (for example, a generator or the like) has a first position relatively close to the drive source 71 side. The target portion 91 is provided, and the second target portion 92 is provided on the side relatively close to the driven body 72. Further, each of the first sensor and the second sensor rotates together with the rotating shaft 8 while facing the rotating shaft 8 at an axial position on the rotating shaft 8 provided with the first target portion 91 and the second target portion 92, respectively. The first time-series data D1 and the second time-series data D2 can be acquired through sensing at the same time when the rotation shaft 8 is rotated by being fixedly installed so as not to be installed.

Then, in such a measurement system, the above-mentioned first time-series data D1 and second time-series data D2 are transferred to a state in which no average twist occurs in the rotation axis 8 (reference time-series data Gr) and to the rotation axis 8. The average twist angle is easily calculated based on the reference time-series data Gr and the target time-series data Gt acquired by sensing each of the states in which the average twist occurs (target time-series data Gt). be able to.

Next, an embodiment in which the above-mentioned average helix angle and the torsional vibration amount are measured at the same time will be described.
As described above, in the embodiment shown in FIG. 1, in the rotary shaft 8, the joint 83 is installed between the output shaft 81 of the drive source 71 and the driven body 72. These rotate as a rotating body as a unit, but the rotating shaft 8 always rotates while twisting due to the torque during rotation. When the joint 83 is a rigid body, the twist is minute, but when it is a laminated rubber or thin plate such as an elastic joint and the output shaft 81 and the input shaft 82 are connected, the twist of the joint 83 is twisted. The output shaft 81 and the input shaft 82 always rotate in a twisted state with a relative angle difference which is an average twist angle, starting from the joint 83. On the other hand, in a drive source 71 such as an engine, the force for rotating the rotating shaft 8 is given by the explosion of each cylinder, so strictly speaking, the rotational load on the rotating shaft 8 is intermittent. Therefore, the rotating shaft 8 undergoes a slight change in torsion (torsional vibration) during constant rotation. In this embodiment, the average helix angle and the torsional vibration amount are measured at the same time.

In some embodiments, as shown in FIG. 3, the twist amount measuring device 1 is provided with a plurality of third target portions provided on the outer peripheral surface of the rotating shaft 8 at intervals along the circumferential direction. A third data acquisition unit 23 configured to acquire the third time-series data D3 intermittently detected by 93 according to the rotation of the rotation axis 8, and a third time acquired by the third data acquisition unit 23. A torsional vibration amount calculation unit 4 for calculating the torsional vibration amount based on the series data D3 may be further provided.

In the present embodiment, the third target portion 93 is formed by a plurality of reflective portions Tw included in the striped reflective tape T. In other words, the plurality of third target portions 93 are provided adjacent to the second target portion 92 in the circumferential direction at the axial position of the rotation shaft 8 in which the second target portion 92 is provided. Therefore, in the present embodiment, in the second time-series data D2, the second target unit 92 and the plurality of third target units 93 are intermittently and sequentially detected for each rotation of the rotation shaft 8 by the second sensor. Therefore, the third time-series data D3 including the same number of detection signals Sc as the number of the third target units 93 is included in each rotation. Therefore, the third data acquisition unit 23 deletes the detection signal Sb of the second target unit 92 from the input second time series data D2, thereby deleting the detection signal Sb from the second time series data D2 to the third time series. By extracting the data D3, the third time series data D3 is acquired.

Further, in the present embodiment, the torsional vibration amount calculation unit 4 has the same circumferential length of each of the plurality of third target units 93 arranged at equal intervals such as the reflective unit Tw of the striped reflective tape T. On the premise of the above, the torsional vibration amount is calculated based on the third time series data D3. In other words, it is premised that the plurality of third target portions 93 have the same circumferential length and are arranged at equal intervals along the circumferential direction of the rotation axis 8. .. Therefore, in the storage device of the twist amount measuring device 1, the time interval (pulse pitch interval) or the angle interval of the detection signal Sc of the third target unit 93 adjacent to each other in the third time series data D3 is used as a reference interval. It is remembered. For example, the interval (length) of each third target portion 93 when the rotation shaft 8 is not twisted is stored, and the third time-series data D3 acquired from the rotation speed (rotation speed) or the like is stored. 3 The pulse pitch interval and the angle interval of the target unit 93 may be calculated.

Then, the torsional vibration amount calculation unit 4 mutually regarding the detection signal Sc (pulse signal) of each third target unit 93 included in the third time series data D3b obtained when the rotation shaft 8 is twisted. The torsional vibration amount may be calculated by calculating the difference between the pulse pitch interval or the angular interval of the detection signal Sc adjacent to the above and the above reference interval and storing the difference together with the time of each detection signal Sc. This makes it possible to measure the torsional vibration amount with a simple configuration using one sensor without separately providing a sensor for obtaining the third time series data D3b.

In some other embodiments, as shown in FIG. 3, the torsional vibration amount calculation unit 4 has a third time series when the rotation shaft 8 is rotated at the above-mentioned first speed Va (at the time of extremely low speed rotation). The torsional vibration amount may be calculated based on the comparison between the data D3a and the third time-series data D3b when the rotation shaft 8 is rotated at the above-mentioned second speed Vb (during high-speed rotation). That is, as described above, it is possible to measure the torsional vibration amount by knowing the position of the third target unit 93 in the third time series data D3, but each of the plurality of third target units 93 is evenly spaced. Even if it is placed in, an error in processing or mounting (pulse pitch error) may actually occur. Therefore, such an error can be canceled by using the third time series data D3a when the rotating shaft 8 is not twisted, and the measurement accuracy can be improved.

Specifically, the intervals between the detection signals Sc of the plurality of third target units 93 are stored based on the third time-series data D3a when the rotation shaft 8 is not twisted. At this time, for example, by simultaneously performing the sensing by the first sensor S1 of the first target unit 91 and the sensing by the second sensor S2 of the third target unit 93, the first time series data D1a and the third at the same time are performed. The time-series data D3a may be acquired and the reference interval between the detection signals Sc of the plurality of third target units 93 may be stored with reference to the position of the detection signal Sa of the first target unit 91. In this way, the reference pitch table Pb, which is the data in which the intervals between the detection signals Sc are stored, is created. By referring to the reference pitch table Pb, for example, it is possible to obtain the value of the above interval at the xth position (x is an integer of 2 or more) counting from the reference.

Then, the first time-series data D1b and the third time-series data D3b obtained by simultaneously sensing when the rotation shaft 8 is twisted are obtained, and based on the third time-series data D3b, the first time-series data D1b and the third time-series data D3b are obtained. The intervals between the detection signals Sc of the plurality of third target units 93 are calculated, and the error of the reference pitch table Pb (pulse pitch table) to be compared with each of these calculated intervals is transmitted to the first time series data D1b. Select each based on, and correct each calculated interval. As a result, even if there is a tolerance in the shape of the third target portion 93, it is based on the third time series data D3 measured in the case where the rotating shaft 8 is twisted and in the case where the rotating shaft 8 is not twisted. , It becomes possible to measure the torsional vibration amount with high accuracy.

However, the present invention is not limited to this embodiment. In some other embodiments, the plurality of third target portions 93 may be provided along the circumferential direction of the rotation shaft 8 at different axial positions from the second target portion 92. In this case, a third sensor different from the second sensor S2 is fixedly installed in the same manner as the second sensor S2, and sensing is performed when the rotation shaft 8 rotates to acquire the third time series data D3. You may.

According to the above configuration, based on the third time series data D3 including the detection signal Sc of the plurality of third target units 93 provided at intervals along the circumferential direction on the outer peripheral surface of the rotating shaft 8. , Calculate the torsional vibration amount. As a result, the average helix angle and the torsional vibration amount can be measured at the same time.

Hereinafter, a twist amount measuring method corresponding to the process executed by the twist amount measuring device 1 described above will be described with reference to FIG. FIG. 6 is a diagram showing a twist amount measuring method according to an embodiment of the present invention. The method for measuring the amount of twist is a device for measuring the amount of twist of the rotating shaft for calculating the average twist angle generated during rotation of the rotating shaft 8 connecting the drive source 71 and the driven body 72 driven by the drive source 71. be.

Then, as shown in FIG. 6, the twist amount measuring method includes a first data acquisition step and a second data acquisition step for acquiring the above-mentioned first time-series data D1 which is the output data of the above-mentioned first sensor S1. Run. The second data acquisition step (S2) includes a second data acquisition step for acquiring the above-mentioned second time-series data D2 which is the output data of the above-mentioned second sensor S2, and the above-mentioned first data acquisition step and second data. Based on the first time-series data D1 and the second time-series data D2 acquired by the acquisition step, the average twist angle calculation step for calculating the average twist angle generated on the rotation axis 8 during rotation is provided. These first data acquisition step, second data acquisition step, and average twist angle calculation step are executed by the first data acquisition unit 21, the second data acquisition unit 22, and the average twist angle calculation unit 3, respectively, which have already been described. Since it is the same as the processing content to be performed, the details are omitted.

In the embodiment shown in FIG. 6, in step S1, while the rotation shaft 8 is being rotated at the above-mentioned first speed Va (at the time of extremely low speed rotation), sensing by the first sensor S1 and the second sensor S2 is simultaneously executed. At the same time, by executing the above-mentioned first data acquisition step and second data acquisition step, the reference time-series data Gr including the above-mentioned first time-series data D1a and second time-series data D2a is acquired. In the subsequent step S2, while rotating the rotation shaft 8 at the second speed Vb (during high-speed rotation), the first sensor S1 and the second sensor S2 simultaneously execute sensing and acquire the first data. By executing the step and the second data acquisition step, the target time-series data Gt including the first time-series data D1b and the second time-series data D2b described above is acquired. Then, in step S3, the average helix angle is calculated by executing the above-mentioned average helix angle calculation step. The order of steps S1 and S2 may be reversed.

Further, in some embodiments, in the embodiment shown in FIG. 6, the twist amount measuring method is acquired by the third data acquisition step for acquiring the third time series data D3 described above and the third data acquisition step. Further, a torsional vibration amount calculation step for calculating the torsional vibration amount based on the third time series data D3 may be further provided. Since the third data acquisition step and the torsional vibration amount calculation step are the same as the processing contents executed by the third data acquisition unit 23 and the torsional vibration amount calculation step described above, details thereof will be omitted.

In the embodiment shown in FIG. 6, in the above step S1, the above-mentioned first time series data D1a, the second time series data D2a, and the third time series are further executed together with the above third data acquisition step. The reference time series data Gr including the data D3a is acquired. Further, in the above step S2, by further executing the above-mentioned third data acquisition step together, the target time including the above-mentioned first time-series data D1b, second time-series data D2b, and third time-series data D3b. Acquire series data Gt. Then, in step S4 following the above step S3, the torsional vibration amount is calculated by executing the above-mentioned torsional vibration amount calculation step. The order of steps S3 and S4 may be reversed.

The present invention is not limited to the above-described embodiment, and includes a modification of the above-mentioned embodiment and a combination of these embodiments as appropriate.

1 Twist amount measuring device 12 Display 21 1st data acquisition unit 22 2nd data acquisition unit 23 3rd data acquisition unit 3 Average twist angle calculation unit 32 Angle position calculation unit 4 Twist vibration amount calculation unit 71 Drive source 72 Driven body 8 Rotating shaft 81 Output shaft 82 Input shaft 82b Bolt 82f Flange 83 Joint 9 Target part 91 First target part 92 Second target part 93 Third target part

S1 1st sensor S2 2nd sensor D1 1st time series data D1a 1st time series data (when rotating at the 1st speed)
D1b 1st time series data (when rotating at 2nd speed)
D2 2nd time series data D2a 2nd time series data (when rotating at the 1st speed)
D2b 2nd time series data (when rotating at 2nd speed)
D3 3rd time series data D3a 3rd time series data (when rotating at the 1st speed)
D3b 3rd time series data (when rotating at 2nd speed)
Gr reference time series data Gt target time series data θr angle position (reference time series data)
θt angular position (target time series data)
T Striped reflective tape Tb Non-reflective part Tw Reflective part L Circumferential length (reflective part, non-reflective part)
Sa detection signal (first target part)
Sb detection signal (second target part)
Sc detection signal (third target part)
Va 1st speed Vb 2nd speed Pb Reference pitch table

Claims (9)

A rotary shaft torsion amount measuring device for calculating an average torsion angle generated during rotation of a rotary shaft connecting a drive source and a driven body driven by the drive source.
First data configured to acquire first time-series data, which is output data of the first sensor that detects the first target portion provided on the outer peripheral surface of the rotating shaft once for each rotation of the rotating shaft. Acquisition department and
With the first time-series data of the second sensor that detects the second target portion provided on the driven body side of the first target portion on the outer peripheral surface of the rotation shaft once for each rotation. A second data acquisition unit configured to acquire second time series data including output data at the same time, and
A unit including an average helix angle calculation unit configured to calculate the average helix angle generated on the rotation axis during rotation based on the acquired first time-series data and the second time-series data.
The average helix angle calculation unit is
The reference time-series data including the first time-series data and the second time-series data when the rotation axis is rotated at the first speed at which the average twist does not occur on the rotation axis, and the average twist on the rotation axis. The average twist angle is calculated based on the first time-series data and the target time-series data including the second time-series data when the rotation axis is rotated at the second speed at which the above occurs. A device for measuring the amount of twist of the rotating shaft. The average helix angle calculation unit is
The same time axis of the detection position of the second target portion in the second time series data between the detection positions of the two first target portions adjacent to each other on the time axis in the first time series data. It has an angular position calculation unit that calculates the angular position of the second target unit with respect to the first target unit in the circumferential direction of the rotation axis based on the relative position on the top.
A claim characterized in that the average twist angle is calculated based on the difference between the angle position calculated based on the reference time series data and the angle position calculated based on the target time series data. Item 1. The twist amount measuring device for the rotating shaft according to Item 1. A third time series in which a plurality of third target portions provided on the outer peripheral surface of the rotating shaft at intervals along the circumferential direction of the rotating shaft are intermittently and sequentially detected according to the rotation of the rotating shaft. A third data acquisition unit configured to acquire data,
The torsion amount measuring device for a rotating shaft according to claim 1 or 2, further comprising a torsional vibration amount calculating unit for calculating a torsional vibration amount based on the third time series data. The plurality of third target portions are provided adjacent to the second target portion in the circumferential direction at the axial position of the rotation axis where the second target portion is provided.
The second time-series data is obtained by intermittently and sequentially detecting the second target unit and the plurality of third target units by the second sensor for each rotation of the rotation axis. Contains series data,
The torsional amount of the rotating shaft according to claim 3, wherein the torsional vibration amount calculation unit calculates the torsional vibration amount based on the third time-series data included in the second time-series data. measuring device. The plurality of third target portions have lengths in the circumferential direction that are the same as each other, and are arranged so as to be equidistant from each other along the circumferential direction.
The twist amount measuring device for a rotating shaft according to claim 4, wherein the length of each of the plurality of third target portions in the circumferential direction is different from the length of the second target portion in the circumferential direction. .. The torsional vibration amount calculation unit includes the third time-series data when the rotation shaft is rotated at the first speed and the third time-series data when the rotation shaft is rotated at the second speed. The twisting amount measuring device for a rotating shaft according to any one of claims 3 to 5, wherein the torsional vibration amount is calculated based on the comparison of the above. The rotating shaft includes an output shaft of the driving source, an input shaft for inputting rotation of the output shaft to the driven body, and a joint for connecting the output shaft and the input shaft. Ori,
The first target unit is provided on the output shaft and is provided on the output shaft.
The twist amount measuring device for a rotating shaft according to any one of claims 1 to 6, wherein the second target unit is provided on the input shaft. The drive source is an engine.
The twist amount measuring device for a rotating shaft according to any one of claims 1 to 7, wherein the driven body is a generator. A rotary shaft torsion amount measuring device for calculating an average torsion angle generated during rotation of a rotary shaft connecting a drive source and a driven body driven by the drive source.
The first data acquisition step of acquiring the first time-series data which is the output data of the first sensor that detects the first target portion provided on the outer peripheral surface of the rotating shaft once for each rotation of the rotating shaft.
With the first time-series data of the second sensor that detects the second target portion provided on the driven body side of the first target portion on the outer peripheral surface of the rotation shaft once for each rotation. The second data acquisition step to acquire the second time series data including the output data at the same time, and
Based on the acquired first time-series data and the second time-series data, the average twist angle calculation step for calculating the average twist angle generated on the rotation axis during the rotation is provided.
The average helix angle calculation step is
The reference time-series data including the first time-series data and the second time-series data when the rotation axis is rotated at the first speed at which the average twist does not occur on the rotation axis, and the average twist on the rotation axis. The average twist angle is calculated based on the first time-series data and the target time-series data including the second time-series data when the rotation axis is rotated at the second speed at which the above occurs. How to measure the amount of twist of the rotating shaft.

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