JP5627544B2 - Excitation device - Google Patents

Description

  The present invention relates to a vibration device that vibrates a specimen placed on a diaphragm.

Conventionally, when a specimen (for example, an automobile or the like) is vibrated and a state change of the specimen is inspected, for example, a hydraulic vibrator is used.
In a hydraulic vibration device, the flow direction of oil flowing between a hydraulic source and a cylinder is controlled by a hydraulic servo valve, and a piston in the cylinder is slid by a pressure difference. Then, the specimen placed on the diaphragm is vibrated by the sliding.

Such a hydraulic exciter can excite the specimen while achieving both high excitation force and high-speed excitation.
However, the hydraulic excitation device adjusts the excitation force by always adjusting the flow rate of the oil supplied at the maximum pressure. For this reason, even when the specimen is vibrated with an excitation force smaller than the maximum excitation force of the hydraulic excitation device, the maximum energy is always consumed.
Therefore, in the case of the hydraulic vibration device, the energy efficiency is deteriorated when the necessary vibration force is small. That is, energy cannot be consumed efficiently according to the excitation force.

In order to solve such a problem, it is conceivable to use an electrodynamic excitation device (vibration generator) as disclosed in Patent Document 1.
The electrodynamic excitation device disclosed in Patent Document 1 excites the outer magnetic pole and the inner magnetic pole to form a magnetic field around the movable coil, and supplies an alternating current to the movable coil disposed in the magnetic field. The movable portion supported by the movable coil is vibrated.
According to this, the excitation force can be adjusted by adjusting the excitation current value and the drive current value. For this reason, energy can be consumed efficiently according to the excitation force.

However, the electrodynamic excitation device as disclosed in Patent Document 1 needs to increase the magnetic flux density (excitation current value) when increasing the excitation force. In this case, the excitation speed decreases.
That is, in the electrodynamic excitation device as disclosed in Patent Document 1, the excitation force and the excitation speed are in a trade-off relationship. For this reason, the specimen cannot be vibrated with both high excitation force and high-speed excitation as in the case of a hydraulic excitation device.

In order to efficiently consume energy according to the excitation force, it is conceivable to use an electric servo motor type excitation device (excitation test device) as disclosed in Patent Document 2.
An electric motor-type vibration device as disclosed in Patent Document 2 converts a rotary motion of an electric servo motor into a linear motion by a rotation conversion unit configured by a ball screw and a ball screw nut screwed to the ball screw. , Vibrate the specimen.
According to this, by adjusting the output of the electric servo motor, energy can be efficiently consumed according to the excitation force.

However, the electric servo motor-type vibration device as disclosed in Patent Document 2 is configured to convert a rotational motion into a linear motion, and therefore has a large equivalent inertia.
Therefore, it is difficult to vibrate at high speed in the electric servo motor type vibration device disclosed in Patent Document 2, unlike the hydraulic vibration device.

  As described above, in the conventional vibration device, the specimen can be vibrated with both high vibration force and high-speed vibration as in the case of the hydraulic vibration device. A vibration device that can consume energy according to a vibration force, such as a vibration device, could not be configured.

JP 2005-148006 A JP 2009-122040 A

  The present invention has been made in view of the above situation, and can vibrate a specimen while achieving both high excitation force and high-speed excitation, and can efficiently consume energy according to the excitation force. A vibration device is provided.

  The vibration device for vibrating a specimen placed on the diaphragm is supported by sliding a piston disposed in the cylinder sleeve with a fluid pressure. A drive coil connected to the diaphragm while being arranged in the magnetic field by forming a magnetic field by an excitation coil and a fluid pressure type excitation unit that reciprocates the excitation shaft to be excited to excite the specimen. An electrodynamic excitation unit that reciprocates the drive coil by supplying an alternating current to the sample to vibrate the specimen, and the fluid pressure excitation unit and the electrodynamic excitation The maximum excitation force of the portion is determined by a predetermined ratio with respect to the maximum excitation force of the excitation device, and the excitation device vibrates the specimen when the fluid pressure type excitation unit alone is vibrated. Depending on the energy efficiency of the fluid pressure excitation unit, the fluid pressure excitation And at least one of the electrodynamic exciters, the excitation force when the sample is vibrated is greater than the maximum excitation force of the fluid pressure exciter Is larger, the vibrating operation of the fluid pressure excitation unit and the electrodynamic excitation unit are synchronized, and the fluid pressure excitation unit vibrates the specimen with a maximum excitation force, and The remaining excitation force is supplemented by an electric excitation unit.

  According to a second aspect of the present invention, the vibration exciter includes a bearing that supports a lateral load and a moment applied to the vibration shaft when the specimen is vibrated by a fluid pressure vibration unit. When the specimen is vibrated at the portion, the lateral load and moment applied to the vibration shaft are also supported.

  According to a third aspect of the present invention, the fluid pressure type excitation unit includes a first supply path for supplying the fluid to one side in the excitation direction across the piston of the cylinder sleeve, and the piston of the cylinder sleeve. A second supply path that supplies the fluid, and a bypass path that connects the first supply path and the second supply path to each other are formed on the other side of the excitation direction that is sandwiched. It is closed when the specimen is vibrated by the fluid pressure type vibration part, and is opened when the specimen is vibrated by the electrodynamic vibration part alone.

  The present invention sets the maximum excitation force of the electrodynamic excitation unit to be smaller than the maximum excitation force of the excitation device by synchronizing the operations of the hydraulic excitation unit and the electrodynamic excitation unit. Therefore, the specimen can be vibrated while achieving both high excitation force and high-speed excitation. In addition, since the excitation operation of the electrodynamic excitation unit is controlled according to the energy efficiency of the hydraulic excitation unit with respect to the excitation force when the specimen is vibrated, the energy is efficiently absorbed according to the excitation force. The effect that it can be consumed.

Sectional drawing which shows the whole structure of a vibration apparatus. Sectional drawing of the hydraulic excitation part which shows the state which moves a diaphragm downward. Sectional drawing of the hydraulic excitation part which shows the state which moves a diaphragm upwards. Sectional drawing of the hydraulic excitation part which shows the state which open | released the bypass path | route. Sectional drawing which shows the state which vibrates a test body in a hydraulic excitation part and an electrodynamic excitation part.

  Below, the vibration apparatus 10 of this embodiment is demonstrated.

  In the following, for convenience of explanation, the “up and down direction of the vibration exciter 10” is defined based on the up and down direction of the paper surface in FIG.

  As shown in FIG. 1, the vibration device 10 is used for a vibration test or the like of the specimen W and is for exciting the specimen W. The vibration device 10 includes a diaphragm 20, a hydraulic vibration unit 30, an electrodynamic vibration unit 50, and the like.

  The vibration device 10 of the present embodiment vibrates the specimen W in the vertical direction, but is not limited to this, and for example, the specimen W in the horizontal direction (left and right direction in FIG. 1). May be configured to vibrate.

  The upper part of the diaphragm 20 is formed in a substantially disc shape. The lower part of the diaphragm 20 extends downward from the upper part of the diaphragm 20 while reducing the diameter toward the center of the diaphragm 20. The lower end portion of the diaphragm 20 is connected to the upper end portion of the excitation shaft 33. A specimen W is placed on the upper surface of the diaphragm 20.

The specimen W of this embodiment is assumed to be an automobile having a different weight (for example, a small car or a large car), but is not limited to this.
When the specimen W is an automobile as in the present embodiment, each wheel of the automobile is placed on the diaphragm 20 of the plurality of vibration devices 10.

  The hydraulic excitation unit 30 is for exciting the specimen W with hydraulic pressure. The hydraulic vibration unit 30 is located inside the electrodynamic vibration unit 50. The hydraulic excitation unit 30 includes a cylinder sleeve 31, a piston 32, an excitation shaft 33, two bearings 34 and 34, a tandem mechanism 35, two hydraulic servo valves 38 and 38, and two bypass valves 40 and 40. .

  As shown in FIG. 2, the cylinder sleeve 31 is a hollow substantially cylindrical member and is located below the diaphragm 20. The cylinder sleeve 31 accommodates the piston 32 inside thereof. The upper and lower outer peripheral surfaces of the cylinder sleeve 31 are opened to the outside in two places, and the respective opening portions and the hollow portions communicate with each other.

The piston 32 has a shape that can slide in the cylinder sleeve 31 in the vertical direction. A lower end portion of the excitation shaft 33 is connected to the upper side of the piston 32. A connecting shaft 36 of the tandem mechanism 35 is connected to the lower side of the piston 32.
The piston 32, the excitation shaft 33, and the connection shaft 36 may have a structure that is integrally formed.

  The excitation shaft 33 is arranged such that its axial direction is parallel to the vertical direction. The upper end of the excitation shaft 33 is connected to the diaphragm 20 and supports the diaphragm 20 (see FIG. 1). The outer diameter of the excitation shaft 33 is smaller than the inner diameter of the cylinder sleeve 31. That is, a predetermined gap is formed between the outer peripheral surface of the excitation shaft 33 and the inner peripheral surface of the cylinder sleeve 31.

Inside the cylinder sleeve 31, a gap between the cylinder sleeve 31 and the excitation shaft 33 is divided in the vertical direction by the piston 32, and each divided gap is formed as an oil chamber.
In this embodiment, the oil chamber on the upper side (one side in the excitation direction) across the piston 32 of the cylinder sleeve 31 is the first oil chamber 31a, and the oil chamber on the lower side (the other side in the excitation direction) is the second oil chamber 31b. Formed as.

  The bearings 34 and 34 are respectively arranged on the upper side and the lower side of the cylinder sleeve 31 and support lateral loads and moments applied to the vibration shaft 33 and the connecting shaft 36 when the specimen W is vibrated. Each bearing 34 and 34 of this embodiment is comprised by the existing hydraulic-type hydrostatic bearing, respectively.

The tandem mechanism 35 holds the diaphragm 20 and the excitation shaft 33 so that the diaphragm 20 does not move downward due to the weight of the specimen W when the specimen W is placed on the diaphragm 20. is there. The tandem mechanism 35 holds the diaphragm 20 by connecting a connecting shaft 36 having an open bottom surface and an accumulator through a pipe 37 and supplying fluid (for example, oil) from the accumulator.
The outer diameter of the connecting shaft 36 is set to be approximately the same as the outer diameter of the excitation shaft 33.

  Note that the tandem mechanism 35 is not necessarily provided in the hydraulic vibration exciter 30.

  The hydraulic servo valves 38 and 38 are for supplying fluid to the oil chambers 31a and 31b, respectively.

In addition, although the fluid supplied to each oil chamber 31a * 31b shall be oil in this embodiment, it is not limited to this, For example, water etc. may be sufficient.
The hydraulic vibration unit 30 may be configured to include only one hydraulic servo valve 38.

Each of the hydraulic servo valves 38 and 38 is attached to the outer peripheral surface of the cylinder sleeve 31 and communicates with a hydraulic pressure source via a hose and piping.
Each hydraulic servo valve 38, 38 has an internal passage communicating with each oil chamber 31a, 31b inside thereof. Also, a first supply port 38a, a second supply port 38b, and a return port 38c are formed at the end of the internal passage on the hydraulic power source side (side away from the oil chambers 31a and 31b).

The first supply port 38a is formed above the return port 38c and is a port for supplying a high-pressure fluid from the hydraulic source to the first oil chamber 31a.
The second supply port 38b is formed below the return port 38c, and is a port for supplying high-pressure fluid from the hydraulic pressure source to the second oil chamber 31b.
The return port 38c is a port for returning fluid from the oil chambers 31a and 31b to the hydraulic pressure source.

The hydraulic servo valves 38 and 38 open and close the ports 38a to 38c by moving the spool 39 in the vertical direction.
The spool 39 is provided inside the hydraulic servo valves 38 and 38 so as to be slidable in the vertical direction, is disposed in the vicinity of the ports 38a to 38c, and has a shape capable of simultaneously closing the ports 38a to 38c.

  The hydraulic servo valves 38 and 38 move the spool 39 upward to open the first supply port 38a and supply high-pressure fluid to the first oil chamber 31a (first supply port in FIG. 2). (See arrow shown at 38a). At this time, the second supply port 38b is closed, and the return port 38c and the second oil chamber 31b are communicated.

In this case, the pressure in the first oil chamber 31a becomes larger than the pressure in the second oil chamber 31b, and the fluid in the second oil chamber 31b is returned to the hydraulic pressure source through the return port 38c (return port in FIG. 2). (See arrow shown at 38c). Accordingly, the piston 32 moves downward.
Along with this, the excitation shaft 33 and the diaphragm 20 move downward (see the arrow shown in the excitation shaft 33 in FIG. 2).

  As shown in FIG. 3, each of the hydraulic servo valves 38 and 38 moves the spool 39 downward to open the second supply port 38b and supply a high-pressure fluid to the second oil chamber 31b (see FIG. 3). (See the arrow shown in the second supply port 38b in FIG. 3). At this time, the first supply port 38a is closed, and the return port 38c and the first oil chamber 31a are communicated.

In this case, the pressure in the second oil chamber 31b becomes larger than the pressure in the first oil chamber 31a, and the fluid in the first oil chamber 31a is returned to the hydraulic pressure source through the return port 38c (return port in FIG. 3). (See arrow shown at 38c). Accordingly, the piston 32 moves upward.
Along with this, the excitation shaft 33 and the diaphragm 20 move upward (see the arrow shown in the excitation shaft 33 in FIG. 3).

  In this way, the hydraulic excitation unit 30 slides the piston 32 in the vertical direction by the pressure difference between the oil chambers 31a and 31b by reciprocating the spool 39 in the vertical direction, thereby generating the excitation shaft 33. Is reciprocated in the vertical direction to function as a fluid pressure excitation unit for exciting the specimen W.

  In the present embodiment, a path for supplying a fluid to the first oil chamber 31a is referred to as “first supply path C1”. Further, the path for supplying the fluid to the second oil chamber 31b is referred to as “second supply path C2”.

  The bypass valves 40 and 40 are for communicating the supply paths C1 and C2, respectively, or for releasing the communication state of the supply paths C1 and C2. The bypass valves 40 and 40 are located between the hydraulic servo valves 38 and 38 and the cylinder sleeve 31 in the supply paths C1 and C2, respectively.

  The supply paths C1 and C2 branch toward the bypass valves 40 and 40, respectively, in the middle of the flow direction. The branching end communicates with each bypass valve 40.

A lock block 41 is disposed inside each bypass valve 40.
The lock block 41 is configured to be urged upward by a spring and movable upward, and to be moved downward by supplying a high-pressure fluid (for example, oil) to the upper side thereof. Composed.

In the present embodiment, a path from a portion where each of the supply paths C1 and C2 branches to the bypass valve 40 is denoted as “bypass path C3”.
That is, the bypass paths C3 and C3 are paths that communicate the supply paths C1 and C2, respectively.

Each bypass valve 40, 40 supplies a high-pressure fluid to the upper side of the lock block 41, thereby moving the lock block 41 downward against the biasing force of the spring (each bypass valve 40 in FIG. 3). (See arrow shown at 40).
Thereby, the communication state of each supply path C1 * C2 is cancelled | released. That is, the bypass paths C3 and C3 are closed.

As shown in FIG. 4, each bypass valve 40, 40 releases the fluid supply to the upper side of the lock block 41, so that the urging force of the spring acts on the lock block 41, and the lock block 41 is moved upward. Move to.
Thereby, each bypass valve 40 * 40 connects each supply path | route C1 * C2. That is, the bypass paths C3 and C3 are opened.

  As shown in FIGS. 2 and 3, the bypass valves 40 and 40 close the bypass paths C <b> 3 and C <b> 3 when the diaphragm 20 is vibrated by the hydraulic vibration unit 30.

  As shown in FIG. 1, the electrodynamic exciter 50 excites the specimen W by the action of the magnetic field 50 a and the drive coil 53. The electrodynamic exciter 50 is connected to the upper side of the hydraulic exciter 30 via an attachment member. The electrodynamic excitation unit 50 includes a main body 51, two excitation coils 52 and 52, and a drive coil 53.

  The main body 51 is a substantially cylindrical member that can accommodate the hydraulic excitation unit 30 therein. The upper side of the main body 51 is formed as an accommodating portion 51 a that protrudes toward the inner side in the radial direction of the main body 51.

The accommodating portion 51a is formed with a hollow portion that is formed substantially continuously in an annular shape along the shape of the accommodating portion 51a while the cross-sectional shape along the cylinder axis direction of the main body 51 is substantially rectangular. A gap 51b is formed on the upper side of the housing 51a.
The gap 51b is an opening of the main body 51 that is formed in a substantially annular shape when the main body 51 is viewed from above, and communicates with the hollow portion of the housing portion 51a.
The accommodating part 51a is comprised with a magnetic body (for example, iron etc.).

The exciting coil 52 is annularly arranged in the accommodating portion 51a along the vertical direction, and an exciting current (DC current) is supplied from a predetermined power source. A gap in which the drive coil 53 can move up and down is formed inside the annular portion of the accommodating portion 51a.
The electrodynamic excitation unit 50 excites the accommodating portion 51 a by supplying an excitation current to the excitation coil 52, and forms a magnetic field 50 a orthogonal to the gap portion 51 b by the excitation coil 52.

The upper end of the drive coil 53 is coupled to the outer end of the diaphragm 20 via a coil holder 53a. The lower end portion of the drive coil 53 is disposed in a gap formed between the accommodating portion 51a and the excitation coil 52 through the gap portion 51b.
That is, the drive coil 53 is disposed in the magnetic field 50a orthogonal to the gap 51b. The driving coil 53 is supplied with a driving current (alternating current) from a predetermined power amplifier.

  The electrodynamic exciter 50 configured in this way supplies a driving current (alternating current) to the driving coil 53 in a state in which the magnetic field 50a is formed, thereby causing the driving coil 53 to reciprocate, thereby providing a specimen. Shake W.

  At this time, since the drive coil 53 is connected to the diaphragm 20 via the coil holder 53a, the drive coil 53 is guided by the bearings 34 and 34 via the excitation shaft 33 and the coupling shaft 36, and moves in the vertical direction. That is, the electrodynamic exciter 50 shares a guide with the hydraulic exciter 30.

  In other words, the vibration device 10 is a combination of a hydraulic vibration device and an electrodynamic vibration device, and each vibration unit 30, 50 vibrates one diaphragm 20. This is a hybrid-type vibration device configured as follows.

The maximum excitation force of each of the excitation units 30 and 50 is determined by a predetermined ratio with respect to the maximum excitation force of the excitation device 10.
That is, each of the vibration units 30 and 50 has a fixed ratio (for example, 50% of each other, the hydraulic vibration unit 30 is 60% and the electrodynamic type with the maximum vibration force of the vibration device 10 being 100%. The vibration unit 50 can vibrate up to 40%.

  That is, the maximum excitation force of each of the excitation units 30 and 50 is smaller than the maximum excitation force of the excitation device 10. Accordingly, the shape of each of the vibration units 30 and 50 is the shape of a hydraulic vibration device and an electrodynamic vibration device that can output the same maximum vibration force as the maximum vibration force of the vibration device 10. Smaller than.

The hydraulic excitation unit 30 is located inside the main body 51 of the electrodynamic excitation unit 50. That is, the vibration device 10 has a shape in which the hydraulic vibration unit 30 is embedded inside the electrodynamic vibration unit 50.
That is, the vibration exciter 10 has a configuration in which the hydraulic vibration exciter 30 and the electrodynamic exciter 50 are arranged in parallel by using the common bearings 34 and 34.

  Therefore, the shape of the vibration device 10 can be made more compact than the hydraulic vibration device and the electrodynamic vibration device having the same maximum vibration force.

  Next, the characteristics of the respective excitation units 30 and 50 relating to the energy consumption when adjusting the excitation force will be described.

As shown in FIGS. 2 and 3, the hydraulic exciter 30 is always supplied with a high-pressure fluid from the hydraulic source to the oil chambers 31 a and 31 b at the maximum pressure.
Therefore, the hydraulic vibration exciter 30 supplies the oil chambers 31a and 31b by adjusting the amount of movement of the spool 39 of each hydraulic servo valve 38 and 38 (that is, how the ports 38a to 38c are opened). The flow rate of the fluid to be adjusted is adjusted, and the excitation force is adjusted.

In such a configuration, even when the excitation force is adjusted, the pressure of the hydraulic pressure source does not change, so the energy consumed when the specimen W is vibrated does not decrease.
That is, the hydraulic exciter 30 has a characteristic that the energy consumption does not vary regardless of the magnitude of the exciting force. That is, as the amount of adjustment of the excitation force (the amount of decrease with respect to the maximum excitation force of the hydraulic excitation unit 30) is larger, the energy efficiency of the hydraulic excitation unit 30 becomes worse.

The excitation force of the electrodynamic excitation unit 50 is determined by the product of the magnetic flux density of the gap 51b, the length of the drive coil 53, and the drive current value. The magnetic flux density changes according to the exciting current value supplied to the exciting coil 52.
That is, the electrodynamic excitation unit 50 adjusts the excitation force by adjusting the excitation current value and the drive current value.

  That is, the electrodynamic excitation unit 50 has a characteristic that the amount of energy consumption decreases according to the adjustment amount of the excitation force (the reduction range of the excitation force).

  The excitation device 10 of the present embodiment switches the excitation current value stepwise according to the excitation force when the specimen W is vibrated by the electrodynamic excitation unit 50. Then, a drive current corresponding to the drive current value set based on the switched excitation current value and the excitation force when the specimen W is excited by the electrodynamic excitation unit 50 is supplied.

That is, the electrodynamic excitation unit 50 does not maintain a state where the excitation current value is constant and can always exhibit the maximum excitation force, but can exhibit an optimum excitation force with respect to the necessary excitation force. It is the structure switched to a state.
As a result, the energy that is always consumed and the energy required for cooling the coils 52 and 53 can be reduced, and the energy efficiency can be further improved.

  Here, the maximum excitation speed of each of the excitation units 30 and 50 is the same as the maximum excitation speed of the excitation device 10.

  When the excitation current value of the electrodynamic excitation unit 50 is increased in order to increase the excitation force, the excitation speed decreases. That is, when the electrodynamic excitation unit 50 vibrates the specimen W with the maximum excitation force, the excitation speed is the lowest.

  The electrodynamic excitation unit 50 suppresses the amount of decrease in the maximum excitation speed by making the maximum excitation force smaller than the maximum excitation force of the excitation device 10, and the maximum of the hydraulic excitation unit 30. The maximum excitation speed that is the same as the excitation speed is secured.

  Next, a specific operation of the vibration device 10 will be described.

Hereinafter, it is assumed that each of the vibration units 30 and 50 can vibrate up to 50% of the maximum vibration force of the vibration device 10. That is, the maximum excitation force of each excitation part 30 * 50 is mutually the same magnitude | size.
In addition, the vibration force when vibrating the specimen W is referred to as “necessary vibration force”.

  When the specimen W is vibrated with the hydraulic exciter 30 alone and the energy efficiency of the hydraulic exciter 30 deteriorates, the vibration exciter 10 is provided with the electrokinetic exciter 50 alone. Vibrates.

  As such a case, for example, when the required excitation force is significantly lower than the maximum excitation force of the hydraulic excitation unit 30 (for example, about 20% of the maximum excitation force of the hydraulic excitation unit 30). And so on).

When the specimen W is vibrated by the electrodynamic vibration unit 50 alone, as shown in FIG. 4, the vibration device 10 releases the fluid supply to the lock block 41 of each bypass valve 40/40. The bypass paths C3 and C3 are opened.
Further, the ports 38a to 38c of the hydraulic servo valves 38 and 38 are closed, and the supply of fluid to the oil chambers 31a and 31b is stopped.

  As a result, there is no pressure difference between the oil chambers 31a and 31b, and the piston 32 is in a free state (a state in which resistance due to the differential pressure does not act on the vibration operation of the electrodynamic vibration unit 50). The electrodynamic excitation unit 50 vibrates the specimen W in this state.

As described above, in the vibration exciter 10, when the energy efficiency is deteriorated by adjusting the excitation force of the hydraulic excitation unit 30, the electrodynamic excitation unit 50 takes charge of the excitation operation of the specimen W.
According to this, it is possible to make use of the characteristics of the electrodynamic excitation unit 50 in which the energy consumption is reduced according to the adjustment amount of the excitation force, and the necessary excitation force is greater than the maximum excitation force of the hydraulic excitation unit 30. Even when the vibration force is small, energy can be consumed efficiently.

In this embodiment, since the maximum excitation force of each excitation part 30 * 50 is the same magnitude | size, when exciting the test body W with the electrodynamic excitation part 50 single-piece | unit, required excitation force is electrodynamic. In some cases, the maximum excitation force of the expression excitation unit 50 may be significantly lower.
In this case, the excitation device 10 switches the excitation current value to a predetermined stage corresponding to the necessary excitation force (lower than the excitation current value when exciting with the maximum excitation force) and the switched excitation. A drive current value is set based on the current value and the necessary excitation force.

  According to this, when the vibrating device 10 vibrates the specimen W with the electrodynamic vibration unit 50 alone (that is, the necessary vibration force is larger than the maximum vibration force of the hydraulic vibration unit 30). When small, it can consume energy more efficiently.

  If the energy efficiency of the hydraulic exciter 30 does not deteriorate when the specimen W is vibrated with the hydraulic exciter 30 alone, the vibration exciter 10 alone or each of the exciters is provided. The specimen W is vibrated at both the parts 30 and 50.

  In such a case, for example, the required excitation force is the same as the maximum excitation force of the hydraulic excitation unit 30 (in this embodiment, 50% of the maximum excitation force of the excitation device 10). In some cases, the required vibration force is slightly smaller (or slightly larger) than the maximum vibration force of the hydraulic vibration unit 30.

When the necessary excitation force is equal to or less than the maximum excitation force of the hydraulic vibration unit 30, the vibration device 10 vibrates the specimen W with the hydraulic vibration unit 30 alone.
At this time, as shown in FIG. 2 and FIG. 3, the vibration exciter 10 supplies fluid to the lock block 41 of the bypass valves 40 and 40 and closes the bypass paths C3 and C3.
As a result, the vibration exciter 10 is in a state in which a pressure difference can be generated in each of the oil chambers 31a and 31b, and the specimen W is vibrated by the hydraulic exciter 30 alone.

If the required excitation force is slightly lower than the maximum excitation force of the hydraulic excitation unit 30, the hydraulic excitation unit 30 slightly adjusts the excitation force according to the required excitation force.
That is, the hydraulic excitation unit 30 adjusts the excitation force by slightly reducing the flow rate of the fluid by the spool 39.

  Further, when the necessary vibration force is larger than the maximum vibration force of the hydraulic vibration unit 30 (for example, the necessary vibration force is 120% of the maximum vibration force of the hydraulic vibration unit 30). 5), the specimen W is vibrated by both the vibrating portions 30 and 50 as shown in FIG.

  At this time, the vibration exciter 10 supplies fluid to the lock block 41 of the bypass valves 40 and 40, and closes the bypass paths C3 and C3 (see FIG. 3).

  As described above, each bypass path C3 and C3 is closed when the specimen W is vibrated by the hydraulic vibrator 30, and the specimen W is vibrated by the electrodynamic vibrator 50 alone. Sometimes open.

According to this, according to the vibration state of the vibration device 10 (when each vibration unit 30/50 alone or each vibration unit 30/50 is vibrated), the communication states of the supply paths C1 and C2 Can be switched.
That is, the specimen W can be vibrated by the electrodynamic exciter 50 without the pressure difference between the oil chambers 31 a and 31 b interfering with the exciter operation of the electrodynamic exciter 50.

When the specimen W is vibrated by both the vibration units 30 and 50, the vibration device 10 vibrates the specimen W in synchronization with the vibration operation of the vibration parts 30 and 50. That is, the specimen W is vibrated in accordance with the excitation direction of each of the excitation units 30 and 50 and the switching timing of the excitation direction.
Thereby, the vibration apparatus 10 can vibrate the specimen W with a vibration force obtained by adding the vibration force of the hydraulic vibration unit 30 and the vibration force of the electrodynamic vibration unit 50.

When the specimen W is vibrated by both the vibrators 30 and 50, the hydraulic vibrator 30 vibrates the specimen W with the maximum vibration force.
That is, when the necessary vibration force is larger than the maximum vibration force of the hydraulic vibration unit 30, the vibration device 10 applies the specimen W without adjusting the vibration force of the hydraulic vibration unit 30. Shake.

Specifically, when the required excitation force is 120% of the excitation force of the hydraulic excitation unit 30, the hydraulic excitation unit 30 provides 100% excitation force and electrodynamic excitation. The specimen W is vibrated with the remaining 20% of the exciting force at the portion 50 (see arrows F1 and F2 shown in FIG. 5).
At this time, the excitation device 10 switches the excitation current value to the excitation current value corresponding to the remaining 20%, and sets the excitation current value based on the switched excitation current value and the excitation force corresponding to the remaining 20% excitation force. A drive current corresponding to the drive current value is supplied, and the specimen W is vibrated by the electrodynamic vibrator 50.

According to this, the vibration exciter 10 compensates for the excitation force that the hydraulic excitation unit 30 alone is not sufficient with the electrodynamic excitation unit 50, so that it exceeds the maximum excitation force of the hydraulic excitation unit 30. Even when the required excitation force is large, energy can be consumed efficiently.
That is, since the vibration device 10 controls the vibration operation of the electrodynamic vibration unit 50 according to the energy efficiency of the hydraulic vibration unit 30 with respect to the necessary vibration force, the vibration device 10 can efficiently operate according to the vibration force. Energy can be consumed.

Thus, according to the energy efficiency of the hydraulic exciter 30 when the specimen W is vibrated with the hydraulic exciter 30 alone, At least one of the specimens W is vibrated.
Further, when the vibration force when vibrating the specimen W is larger than the maximum vibration force of the hydraulic vibration unit 30, the vibration device 10 and the hydraulic vibration unit 30 and the electrodynamic vibration are used. The excitation operation of the unit 50 is synchronized.
The vibration device 10 vibrates the specimen W with the maximum vibration force by the hydraulic vibration unit 30 and supplements the remaining vibration force by the electrodynamic vibration unit 50 (see FIG. 5). (See arrow F shown).

  By synchronizing the operations of the vibration units 30 and 50, the maximum vibration force of the electrodynamic vibration unit 50 can be set smaller than the maximum vibration force of the vibration device 10. Thus, the electrodynamic excitation unit 50 ensures the same excitation speed as the maximum excitation speed of the hydraulic excitation part 30.

For this reason, even when the electrodynamic excitation unit 50 is set to the maximum excitation force, that is, when the specimen W is vibrated with the maximum excitation force of the vibration apparatus 10, high-speed excitation is possible.
Therefore, the vibration device 10 can vibrate the specimen W while achieving both high vibration force and high-speed vibration.

  When the specimen W is vibrated by each of the vibration units 30 and 50 alone or both of the vibration units 30 and 50, the bearings 34 and 34 respectively receive the lateral load and moment applied to the vibration shaft 33 and the connecting shaft 36, respectively. To support.

  In other words, the vibration exciter 10 shares the bearings 34 and 34 with the vibration units 30 and 50. Therefore, it is not necessary to separately provide a bearing that supports the vibration shaft 33 when the hydraulic vibration portion 30 is vibrated and a bearing that supports the vibration shaft 33 when the electrodynamic vibration portion 50 is vibrated.

  In this way, when the vibration exciter 10 vibrates the specimen W with the hydraulic exciter 30, each of the bearings 34 and 34 that supports the load applied to the vibration shaft 33 is used for electrodynamic excitation. When the specimen W is vibrated by the unit 50, the load applied to the vibration shaft 33 is also supported.

  According to this, since the number of parts of the vibration device 10 can be reduced, the shape of the vibration device 10 can be made compact and the vibration device 10 can be reduced in weight.

  In the present embodiment, the maximum excitation force of each of the excitation units 30 and 50 is 50% of the maximum excitation force of the excitation device 10, but is not limited thereto.

  The vibration device 10 may switch the vibration state by the vibration units 30 and 50 according to vibration conditions other than the vibration force (for example, vibration speed and displacement). In this case, in consideration of the vibration performance of each of the vibration units 30 and 50, it is determined which vibration unit 30 and 50 to perform vibration.

Specifically, the hydraulic exciter 30 can vibrate the specimen W with a larger displacement than the electrodynamic exciter 50. For this reason, when the specimen W is vibrated with a large amount of displacement, the hydraulic exciter 30 is vibrated alone.
In addition, the electrodynamic vibration unit 50 can vibrate the specimen W at a higher frequency than the hydraulic vibration unit 30. For this reason, when vibrating the test body W at a high frequency, it vibrates with the electrodynamic vibration part 50 single-piece | unit.
According to this, the vibration apparatus 10 can vibrate the specimen W under the vibration conditions utilizing the vibration performance of each of the vibration units 30 and 50. That is, the specimen W can be vibrated under wider vibration conditions.

DESCRIPTION OF SYMBOLS 10 Excitation apparatus 20 Diaphragm 30 Hydraulic type vibration part (fluid pressure type vibration part)
31 Cylinder sleeve 32 Piston 33 Excitation shaft 50 Electrodynamic excitation unit 50a Magnetic field 52 Excitation coil 53 Drive coil W Specimen

Claims (3)

A vibration device that vibrates a specimen placed on a diaphragm,
A fluid pressure exciter that vibrates the specimen by reciprocating the excitation shaft that supports the diaphragm by sliding a piston disposed in the cylinder sleeve with fluid pressure;
A magnetic field is formed by an excitation coil, and the test specimen is vibrated by reciprocating the drive coil by supplying an alternating current to the drive coil connected to the diaphragm while being arranged in the magnetic field. An electrodynamic excitation unit,
Comprising
The maximum excitation force of the fluid pressure excitation unit and the electrodynamic excitation unit is
Determined by a predetermined ratio to the maximum excitation force of the excitation device,
The vibration exciter is
According to the energy efficiency of the fluid pressure type vibration part when the fluid pressure type vibration part alone is vibrated, at least one of the fluid pressure type vibration part and the electrodynamic vibration part On the other hand, the specimen is vibrated,
When the excitation force when exciting the specimen is larger than the maximum excitation force of the fluid pressure excitation unit, the excitation operations of the fluid pressure excitation unit and the electrodynamic excitation unit are synchronized. Let
Exciting the specimen with the maximum excitation force in the fluid pressure excitation unit, and supplement the remaining excitation force in the electrodynamic excitation unit,
Excitation device. The vibration exciter is
When the specimen is vibrated by the hydrodynamic exciter, when the specimen is vibrated by the electrodynamic exciter by the bearing that supports the lateral load and moment applied to the excitation shaft, Supports lateral load and moment applied to the excitation shaft,
The vibration device according to claim 1. The fluid pressure excitation unit includes:
A first supply path for supplying the fluid to one side of the excitation direction across the piston of the cylinder sleeve;
A second supply path for supplying the fluid to the other side of the excitation direction across the piston of the cylinder sleeve;
A bypass path communicating the first supply path and the second supply path with each other;
Formed,
The bypass path is
It is closed when the specimen is vibrated with the fluid pressure type vibrator, and is opened when the specimen is vibrated with the electrodynamic vibrator alone.
The vibration device according to claim 1 or 2.

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