JP2013245995A - Excitation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excitation device capable of applying vibrations approximate to actual operation from an upper side to an object to be tested.SOLUTION: An excitation device 1 comprises a fixed part 15 to place an object TP to be tested thereon, a movable part 20 which holds the object TP to be tested between the fixed part 15 and the movable part and is provided so as to freely change the position and attitude thereof with respect to the fixed part 15, and an excitation unit 30 which applies vibrations to the movable part 20 in six axial directions. The movable part 20 can be vibrated in the six axial directions while holding the object TP to be tested between the fixed part 15 and the movable part 20 which is disposed at an upper side of the fixed part 15, such that vibrations approximate to actual operation can be applied from the upper side to the object TP to be tested.

Description

  The present invention relates to a vibration exciter that is used, for example, in a vibration test of a device under test such as an engine mount rubber provided in an automobile.

  The automobile engine is mounted on the chassis via a mount rubber. Conventionally, in a vibration test for confirming the durability of such a mount rubber, an excitation device that applies vibrations in the three axial directions of the X axis, the Y axis, and the Z axis has been used.

  However, in actual driving of an automobile, vibrations in the direction of rotation about each axis in addition to the above three axis directions, that is, vibrations in six axis directions are generated. Then, it was not possible to carry out a test in a state close to such actual behavior. Patent Document 1 discloses a technique capable of applying such a load in the six-axis direction.

  As shown in FIG. 7, the six-axis load device disclosed in Patent Document 1 includes a fixed plate 803, a movable plate 802 disposed above the fixed plate 803 with a space therebetween, and spherical bearings 804 at both ends. These spherical bearings 804 have six actuator units 801 attached to a fixed plate 803 and a movable plate 802, respectively. This 6-axis load device was able to apply a load in the 6-axis direction to the DUT by placing the DUT on the upper surface of the movable plate 802 and driving the six actuator units to extend and contract.

  Then, as a mount rubber vibration device using such a six-axis load device, a load cell capable of measuring a load is disposed downward above the movable plate 802, and a test object placed on the movable plate 802 is used. A configuration may be considered in which the movable plate 802 is vibrated in six axial directions with the mounting rubber pressed against the load cell.

JP-A-9-105706

  However, in the automobile, the engine weight is lighter than the chassis weight, and the engine itself vibrates due to the operation. Therefore, the chassis under the mount rubber is in a stationary state (including a state close to the stationary state), and the engine above the mount rubber. In the vibration device using the above-described 6-axis load device, the structure (load cell) above the mount rubber is fixed and becomes stationary, and the structure is below the mount rubber. Since the object (movable plate) is in a vibration state, the state of the structure sandwiching the mount rubber up and down (stationary or vibration) is opposite to that of an actual automobile, and the state close to the actual operation is reproduced. There was room for further improvement.

  Therefore, an object of the present invention is to provide a vibration device that can apply vibrations close to actual operation from above to a device under test.

  In order to achieve the above-mentioned object, the invention described in claim 1 sandwiches the device under test between the fixing unit on which the device under test is placed and the fixing unit. A vibration device comprising: a movable portion provided so that its position and orientation can be freely changed; and a vibration unit that applies vibrations in six axial directions to the movable portion.

  According to a second aspect of the present invention, in the first aspect of the present invention, the fixed portion includes a base provided on an upper surface, and a frame provided upright on the upper surface of the base. The vibration unit has six actuator units, and each of these actuator units includes a linear actuator part provided around the fixed part and on or near the upper surface of the base, and the movable part in the frame. A crank arm portion swingably provided in a seesaw shape at a high place, a connecting rod portion connecting the linear motion actuator portion and one end of the crank arm portion, the other end of the crank arm portion and the movable portion And a connecting arm part that connects the position and orientation other than the distance so as to be freely changeable. It is an.

  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the fixing portion is constituted by a load cell capable of measuring a load.

  The invention described in claim 4 is the invention described in any one of claims 1 to 3, further comprising a thermostatic chamber that accommodates at least a portion of the fixing portion where the device under test is placed. It is characterized by that.

  The invention described in claim 5 is the invention described in claim 4, wherein the movable portion is provided in a movable portion main body and a lower portion of the movable portion main body and is brought into contact with the device under test. A lid portion provided so as to hermetically cover and cover the upper end of the peripheral wall portion and the peripheral wall portion surrounding at least a portion of the fixed portion on which the DUT is placed. And at least a part of the lid portion is formed of a flexible sheet member, and the contact portion is disposed so as to penetrate the sheet member.

  The invention described in claim 6 is characterized in that, in the invention described in claim 5, the sheet member is formed by stacking a plurality of single-layer sheets.

  The invention described in claim 7 is characterized in that, in the invention described in claim 5 or 6, the sheet member is composed mainly of silicone rubber.

  According to the first aspect of the present invention, the device under test is sandwiched between the fixed portion on which the device under test is placed and the fixed portion, and the position and orientation can be freely changed with respect to the fixed portion. And a vibration unit that applies vibrations in six axial directions to the movable part. Therefore, the movable part is disposed between the fixed part and the movable part disposed above the fixed part. In this state, the movable part can be vibrated in the 6-axis direction by sandwiching the test body, so that vibration closer to the actual operation can be applied to the test body from above. Thereby, it is possible to reproduce a state close to the actual operation in the vibration test of the device under test.

  According to the invention described in claim 2, the vibration exciter includes the base having the fixing portion provided on the upper surface and the frame standing on the upper surface of the base. The vibration unit has six actuator units. Each of these actuator units includes a linear motion actuator portion provided around the fixed portion and on or near the upper surface of the base, and a crank arm portion swingably provided in a seesaw shape at a position higher than the movable portion of the frame. And a connecting rod portion that connects the linear actuator and one end of the crank arm portion, and the other end of the crank arm portion and the movable portion are constant in distance from each other and the position and orientation other than the distance can be freely changed. And a connecting arm portion to be connected. Thereby, the movable part is suspended and supported by the parallel link constituted by the connecting arm part of each actuator unit. In each actuator unit, when the linear actuator part is driven and one end of the crank arm part is moved upward via the connecting rod part, the other end of the crank arm part is moved downward, and the connecting arm part is a connecting part in the movable part. When one end of the crank arm portion is moved downward, the other end of the crank arm portion moves upward, and the connecting arm portion pulls up the connecting portion of the movable portion. In other words, the crank arm portion can convert the force pushed up from the upper surface of the base downward into a force pushing down the movable portion, and the force lowered toward the upper surface of the base can be converted into force pulling up the movable portion upward. In addition, it is possible to lower the center of gravity of the vibration exciter by placing a heavy structure such as a linear actuator on the upper surface of the base or in the vicinity thereof. The frame can be made small, and the vibration device can be miniaturized. Thus, by reducing the size of the vibration device, the resonance frequency of the vibration device can be increased.

  According to the invention described in claim 3, since the fixed portion is constituted by a load cell capable of measuring a load, the vibration applied to the DUT based on the load measured using the fixed portion. The state can be grasped, and therefore, the vibration applied to the device under test can be accurately controlled by feedback controlling the vibration of the movable part using the load.

  According to the invention described in claim 4, since it further includes a thermostatic chamber that accommodates at least the place where the test object is placed in the fixed portion, for example, depending on the surrounding environmental conditions (temperature, humidity, etc.) It is possible to apply vibrations under various environmental conditions for materials whose properties change. Thereby, a state closer to the actual operation in the vibration test of the device under test can be reproduced.

  According to the invention described in claim 5, the movable part has a movable part main body, and a contact part that is provided at a lower part of the movable part main body and is brought into contact with the device under test. Has a peripheral wall portion surrounding at least a place where the test object is placed in the fixed portion, and a lid portion provided so as to seal and cover the upper end of the peripheral wall portion, and at least a part of the lid portion However, it is composed of a flexible sheet member, and the contact part is disposed through the sheet member, so that the vibration of the movable part can be transmitted into the thermostat while the thermostat is sealed. In addition, it is possible to suppress the influence from the outside in the thermostatic bath, and to suppress the dew condensation in the thermostatic bath and the fluctuation of the environmental conditions.

  According to the invention described in claim 6, since the sheet member is formed by stacking a plurality of single-layer sheets, the influence from the outside in the thermostatic bath is further suppressed, and the dew condensation and the environment in the thermostatic bath are suppressed. Variations in conditions can be further suppressed.

  According to the invention described in claim 7, since the sheet member is composed of silicone rubber as a main material, it is possible to suppress a change in material due to the influence of temperature change or vibration of the movable part, and durability. Can be improved.

It is a perspective view which shows the vibration apparatus of one Embodiment of this invention. It is a perspective view which shows the state which saw through the flame | frame in the vibration apparatus of FIG. It is a top view of the movable part with which the vibration apparatus of FIG. 1 is provided. FIG. 2 is a side view (including a partial cross-sectional view) for explaining a configuration of an actuator unit (a state where a piston is in a neutral position) included in the vibration device of FIG. 1. FIG. 2 is a side view (including a partial cross-sectional view) for explaining the configuration of an actuator unit (a state in which a piston protrudes from a neutral position) included in the vibration device of FIG. 1. It is an expanded sectional view explaining the structure of the sheet | seat member provided in the thermostat with which the vibration apparatus of FIG. 1 is provided. It is a perspective view of the conventional 6-axis load apparatus.

  Next, a vibration apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  In the vibration device described below, for example, a test object such as an engine mount rubber is placed on a fixed part composed of a load cell capable of measuring a load, and the test object is placed between the fixed part and the movable part. It is an apparatus that applies vibrations of a device under test by holding and moving a movable part in six axis directions including the X axis, Y axis, Z axis, and rotation directions of the respective axes. This vibration device is used for evaluation of characteristics such as durability in a test object.

  As shown in FIGS. 1 and 2, the vibration device (indicated by reference numeral 1 in each figure) includes a base 11, a frame 14, a fixed portion 15, a movable portion 20, a vibration unit 30, and a thermostatic chamber. 70.

  FIG. 1 is a perspective view showing a vibration exciter according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the frame is seen through in the vibration device of FIG. 1. In FIG. 2, the thermostat is omitted for convenience of explanation.

  The base 11 is a pedestal formed in a substantially hexagonal plate shape in plan view, and is installed on a floor of a building such as a factory via a plurality of air springs 12 provided for posture control and vibration absorption. Has been. In addition, a height-variable lifting table 13 is fixedly attached to the center portion of the base upper surface 11a.

  The frame 14 is a support column erected upward on the base upper surface 11a. In the present embodiment, the frame 14 includes three column portions 14a that are arranged at equal intervals from each other, and three beam portions 14b that fix and connect the upper ends of the column portions 14a adjacent to each other. Yes.

  The fixed portion 15 is composed of a cylindrical weight detector (load cell) that detects a load applied to the fixed portion upper surface 15 a, and is fixedly mounted on the lifting table 13. That is, the fixing portion 15 is provided on the base upper surface 11 a via the lifting table 13. A device under test TP is placed on the fixed portion upper surface 15a. The fixing portion 15 is arranged so that the fixing portion upper surface 15a is parallel to the base upper surface 11a.

  The movable portion 20 is disposed above the central portion of the base upper surface 11a. As shown in FIG. 3, the movable portion 20 includes a movable portion main body 21, a contact portion 22, and three connecting portions 23. FIG. 3 is a top view of a movable part provided in the vibration device in FIG. 1.

  The movable part main body 21 is formed in a substantially regular hexagonal column shape. The contact portion 22 is formed in a circular column shape whose cross-sectional shape is within the hexagonal cross-sectional shape of the movable portion main body 21, and is formed on the movable portion main body lower surface 21 a so as to be coaxial with the movable portion main body 21. It is attached. The contact portion 22 has a contact surface 22a, which is the lower surface thereof, in contact with the device under test TP. Each of the connecting portions 23 is formed in a triangular prism shape whose cross section is an isosceles triangle, and the apex angle of the cross section faces the movable portion main body upper surface 21b side, and among the six side surfaces 21c of the movable portion main body 21 It is fixedly attached to the three side surfaces 21c arranged every other. A connecting arm portion 50 to be described later is attached to the two side surfaces 23 a that form the apex angle in the connecting portion 23. The movable portion 20 is configured so that the contact surface 22a, the movable portion main body lower surface 21a, and the movable portion main body upper surface 21a are parallel to the fixed portion upper surface 15a when pistons 42 included in six actuator units 31 described later are in the neutral position. Is arranged.

  The vibration unit 30 has six actuator units 31. The six actuator units 31 are arranged in groups of two on the three column portions 14a of the frame 14, respectively.

  As shown in FIGS. 4 and 5, each actuator unit 31 includes a linear actuator part 40, a crank arm part 43, a connecting rod part 44, and a connecting arm part 50.

  FIG. 4 is a side view (including a partial cross-sectional view) for explaining the configuration of the actuator unit (the piston is in the neutral position) provided in the vibration device of FIG. FIG. 5 is a side view (including a partial cross-sectional view) for explaining the configuration of the actuator unit (a state where the piston protrudes from the neutral position) included in the vibration device of FIG.

  The linear motion actuator unit 40 includes a hydraulic actuator having a cylinder 41 and a piston 42 accommodated in the cylinder 41. The linear actuator 40 moves the piston 42 linearly with respect to the cylinder 41 using hydraulic pressure, causes the piston 42 to protrude from the cylinder 41, and causes the piston 42 to enter the cylinder 41. The cylinder 41 is fixedly attached to the lower end portion of the frame 14. That is, the linear motion actuator part 40 is disposed around the fixed part 15 and in the vicinity of the base upper surface 11 a by being attached to the lower end part of the frame 14. The six linear motion actuators 40 are arranged so as to surround the lifting table 13 (that is, the fixed portion 15). The piston 42 is moved (that is, protruded / immersed) by the cylinder 41 in the normal direction of the base upper surface 11a. In general, in a hydraulic actuator, a cylinder and a piston can rotate with respect to each other about their axes. However, in this embodiment, a hydraulic actuator that suppresses these rotations and other types of actuators can also be used. is there.

  The crank arm portion 43 has a shaft portion 43 c provided near the center at the upper end portion of the frame 14 such that one end 43 a faces the outer side of the base 11 and the other end 43 b faces the center direction of the base 11. It is attached. Thus, the crank arm portion 43 is attached to the frame 14 so as to be swingable like a seesaw.

  The connecting rod portion 44 is provided with a first connecting portion 45 and a second connecting portion 46 each having a uniaxial joint mechanism at both ends thereof. The first connecting portion 45 and the second connecting portion 46 are swingably connected to one end 43a of the crank arm portion 43 and the piston tip 42a, respectively. The shaft portion 45 a of the first connecting portion 45 and the shaft portion 46 a of the second connecting portion 46 are both arranged in parallel with the shaft portion 43 c of the crank arm portion 43. The connecting rod portion 44 transmits the movement of the piston 42 to one end 43a of the crank arm portion 43, whereby the one end 43a of the crank arm portion 43 is moved (oscillated) in the vertical direction. The connecting rod portion 44 is configured to absorb the displacement in the horizontal direction of the first connecting portion 45 due to the swing of the crank arm portion 43 by the second connecting portion 46 (that is, in the form of a link rod).

  The connecting arm portion 50 includes an upper arm portion 51, a forearm portion 52 that is disposed coaxially with the upper arm portion 51 and has an upper arm portion one end 51a inserted therein, and an upper arm portion one end 51a in the forearm portion 52 around its axis. And a rotary connecting portion 53 having a plurality of bearings that are rotatably held, a first universal connecting portion 54, and a second universal connecting portion 55.

  The first universal connecting portion 54 has a universal joint mechanism (biaxial joint mechanism), and can swing the other end 43b of the crank arm portion 43 and the other end 51b of the upper arm portion substantially in all hemisphere directions. It is connected.

  The second universal connecting portion 55 has a universal joint mechanism, and is provided on the movable portion 20 and the forearm portion other end 52b opposite to the forearm portion one end 52a into which the upper arm portion 51 is inserted. The side surface 23a of the connecting portion 23 is connected so as to be swingable in almost all directions of the hemisphere.

  Thereby, the connection arm part 50 has connected the other end 43b of the crank arm part 43, and the movable part 20 so that mutual distance is constant and position and attitude other than the said distance can change freely.

  The thermostat 70 has a substantially hexagonal cylindrical peripheral wall portion 71 fixedly mounted on the lifting table 13 and a lid portion 72 provided so as to cover and cover the peripheral wall upper end 71a. .

  The peripheral wall portion 71 is made of a highly heat-insulating wall material and is disposed so as to surround the fixed portion 15. A part of the peripheral wall portion 71 is provided so as to be openable and closable so that the device under test TP can be taken in and out of the thermostatic chamber 70.

  The lid portion 72 is provided so as to hermetically close and close the frame portion 73 provided with a circular opening 73a on the inner side thereof and having a circular opening 73a that is substantially the same in shape as the plan view of the peripheral wall upper end 71a. And a flexible sheet member 74.

  As shown in FIG. 6, the sheet member 74 is configured by stacking a plurality (two in this embodiment) of thin sheet-like single layer sheets 75 made of a material such as silicone rubber, for example. FIG. 6 is an enlarged cross-sectional view illustrating a configuration of a sheet member provided in a constant temperature bath provided in the vibration device of FIG. A space is provided between the plurality of single-layer sheets 75, whereby the sheet member 74 is configured to make it difficult for heat to pass therethrough.

  The sheet member 74 has an outer shape that is substantially the same as the opening 73 a of the frame portion 73, and a through hole 74 a that is substantially the same as the cross-sectional shape of the contact portion 22 of the movable portion 20 is provided in the center portion. The contact portion 22 is inserted into the through-hole 74a, and the peripheral surface 22b of the contact portion 22 and the peripheral edge of the through-hole 74a are closely adhered to each other by, for example, an adhesive. ing.

  Next, the operation of the vibration exciter 1 described above will be described with reference to FIGS.

  The movable portion 20 is attached in a suspended state to the distal end (specifically, the forearm portion other end 52b) of the connecting arm portion 50 of each of the six actuator units 31 provided in the vibration unit 30. ing. The connecting arm portion 50 is configured such that the forearm portion 52 is rotatable in the axial direction with respect to the upper arm portion 51, and a first universal connecting portion that is a connecting portion between the connecting arm portion 50 and the crank arm portion 43. 54, and the second universal connecting portion 55, which is a connecting portion between the connecting arm portion 50 and the movable portion 20, is constituted by a universal joint mechanism that can swing in almost all directions of the hemisphere. Further, when the piston 42 is moved, the crank arm portion 43 is swung through the connecting rod portion 44, and the movable portion 20 is swung through the connecting arm portion 50 due to this swinging.

  That is, since the movable part 20 is suspended and supported by the parallel link constituted by the connecting arm part 50 of each actuator unit 31, the movable part 20 is located between the fixed part 15 disposed below the movable part 20. Thus, the position and orientation of the device under test TP can be freely changed with respect to the fixed portion 15. Further, the movement of the piston 42 of the linear motion actuator unit 40 included in each actuator unit 31 swings the six coupling points with the coupling arm unit 50 in the movable unit 20, so that the movement of the piston 42 is appropriately controlled. Thus, the movable part 20 can be vibrated by moving in the six-axis direction.

  For example, as shown in FIG. 4, in all the linear actuator parts 40 (only a part is shown in FIG. 4), the movable part 20 is tested when the piston 42 is in the neutral position (neutral position). The contact surface 22a that contacts the upper portion of the body TP is positioned parallel to the base upper surface 11a.

  Then, from this state, as shown in FIG. 5, when the piston 42 is moved upward in the drawing from the neutral position and protrudes from the cylinder 41 in some of the linear actuator portions 40, The portion of the movable portion 20 to which the connecting arm portion 50 is connected is pushed down by the previously connected connecting arm portion 50, whereby the abutment surface 22a of the movable portion 20 is against the base upper surface 11a. Tilted (ie, posture changed).

  Alternatively, although not shown, in some of the linear actuator units 40, the piston 42 is moved upward from the neutral position in the drawing to protrude from the cylinder 41, and at the same time, in the other linear actuator units 40, 42 is moved downward in the figure from the neutral position and is properly immersed in the cylinder 41, so that the abutment surface 22a of the movable portion 20 is moved while maintaining the level with respect to the base upper surface 11a (that is, the position is changed). ) Or tilted more than FIG.

  In this way, by repeating the tilting and moving of the movable portion 20, it is possible to apply vibrations in the six axial directions to the device under test TP from above.

  As described above, the vibration exciter 1 of the present embodiment sandwiches the device under test TP between the fixing unit 15 and the fixing unit 15 on which the device under test TP is placed and The movable part 20 is provided so that the position and orientation can be freely changed, and the vibration unit 30 applies vibrations in six axial directions to the movable part 20.

  The vibration device 1 includes a base 11 having a fixing portion 15 provided on a base upper surface 11a, and a frame 14 erected on the base upper surface 11a. The vibration unit 30 includes six actuator units 31. In addition, each of these actuator units 31 is provided so as to be swingable like a seesaw at a position higher than the movable portion 20 in the frame 14 and the linear motion actuator portion 40 provided around the fixed portion 15 and in the vicinity of the base upper surface 11a. The distance between the crank arm portion 43, the connecting rod portion 44 that connects the linear motion actuator portion 40 and one end 43a of the crank arm portion 43, and the other end 43b of the crank arm portion 43 and the movable portion 20 is constant. And a connecting arm portion 50 that connects the position and orientation other than the distance so as to be freely changeable.

  In the vibration device 1, the fixed portion 15 is configured by a load cell capable of measuring a load.

  The vibration device 1 further includes a thermostatic chamber 70 that houses the fixed portion 15.

  The vibration device 1 includes a movable portion 20 having a movable portion main body 21 and a contact portion 22 that is provided at a lower portion of the movable portion main body 21 and comes into contact with the device under test TP. A peripheral wall portion 71 that surrounds the fixing portion 15 and a lid portion 72 that is provided so as to cover and cover the upper end 71a of the peripheral wall portion, and a part of the lid portion 72 is configured by a flexible sheet member 74. The contact portion 22 is disposed through the sheet member 74.

  In the vibration exciter 1, the sheet member 74 is configured by stacking a plurality of single-layer sheets on each other.

  In the vibration exciter 1, the sheet member 74 is composed of silicone rubber as a main material.

  As described above, according to the present embodiment, the device under test TP is sandwiched between the fixing unit 15 on which the device under test TP is placed and the fixing unit 15, and the position and orientation of the device under test TP can be freely set. The movable portion 20 is provided so as to be changeable, and the vibration unit 30 that applies vibrations in six axial directions to the movable portion 20 is provided. Therefore, the fixed portion 15 is disposed above the fixed portion 15. In this state, the movable part 20 can be vibrated in the 6-axis direction, so that vibration close to the actual operation is applied to the specimen TP from above. be able to. Thereby, it is possible to reproduce a state close to the actual operation in the vibration test of the device under test TP.

  The vibration device 1 includes a base 11 having a fixing portion 15 provided on the base upper surface 11a, and a frame 14 provided upright on the base upper surface 11a. The vibration unit 30 has six actuator units 31. Each of these actuator units 31 swings in a seesaw shape at a position higher than the movable portion (ie, the upper end portion) of the linear motion actuator portion 40 provided around the fixed portion 15 and in the vicinity of the base upper surface 11a and the movable portion of the frame 14. The crank arm portion 43 that is provided, the connecting rod portion 44 that connects the linear motion actuator portion 40 and one end 43a of the crank arm portion 43, the other end 43b of the crank arm portion 43, and the movable portion 20 are connected to each other. And a connecting arm portion 50 that connects the position and orientation other than the distance so as to be freely changeable. Thereby, the movable part 20 is suspended and supported by the parallel link constituted by the connecting arm part 50 of each actuator unit 31. When each actuator unit 31 drives the linear actuator 40 and moves one end 43a of the crank arm 43 upward via the connecting rod 44, the other end 43b of the crank arm 43 moves downward to connect the connecting arm. When the portion 50 pushes down the connecting portion of the movable portion 20 and moves the one end 43a of the crank arm portion 43 downward, the other end 43b of the crank arm portion 43 moves upward and the connecting arm portion 50 becomes the connecting portion of the movable portion 20. Pull up. That is, the crank arm 43 converts the force pushed up from the base upper surface 11a downward into a force pushing down the movable portion 20, and converts the force pulled down into the base upper surface 11a into a force pulling up the movable portion 20 upward. Therefore, it is possible to lower the center of gravity of the vibration device 1 by placing a heavy structure such as the linear motion actuator unit 40 in the vicinity of the base upper surface 11a, so that the center of gravity of the vibration device 1 is high. Compared to a certain case, the frame 14 and the like can be made smaller, and the vibration exciter 1 can be downsized.

  In addition, since the fixed portion 15 is composed of a load cell capable of measuring a load, the state of vibration applied to the device under test TP can be grasped based on the load measured using the fixed portion 15. For this reason, the vibration applied to the device under test TP can be accurately controlled by feedback-controlling the vibration of the movable portion 20 using the load.

  Moreover, since the thermostat 70 which accommodates the fixing | fixed part 15 is further provided, a vibration etc. can be added on various environmental conditions about the material etc. whose characteristic changes with ambient environmental conditions (temperature, humidity, etc.), for example. . Thereby, a state closer to the actual operation in the vibration test of the device under test TP can be reproduced.

  Further, the movable part 20 has a movable part main body 21 and an abutting part that is provided in the lower part of the movable part main body 21 and comes into contact with the device under test TP. A peripheral wall portion 71 surrounding the peripheral wall portion 71, and a lid portion 72 provided so as to cover and cover the peripheral wall portion upper end 71a, and a part of the lid portion 72 is constituted by a flexible sheet member 74. Since the contact portion 22 is disposed through the sheet member 74, the vibration of the movable portion 20 can be transmitted into the thermostatic chamber 70 in a state where the thermostatic chamber 70 is sealed. It is possible to suppress dew condensation in the thermostat 70 and fluctuations in environmental conditions.

  In addition, since the sheet member 74 is formed by stacking a plurality of single-layer sheets 75, the influence from the outside in the thermostat 70 is further suppressed, and the dew condensation in the thermostat 70 and the fluctuation of environmental conditions are further suppressed. can do.

  Further, since the sheet member 74 is composed of silicone rubber as a main material, changes in material due to temperature changes and the influence of vibration of the movable part 20 can be suppressed, and durability can be improved.

  In the above-described embodiment, the first universal connection portion 54 and the second universal connection portion 55 included in the connection arm portion 50 are configured by the universal joint mechanism, but are not limited thereto. . For example, a ball joint mechanism or the like may be used as the first universal connection portion 54 and the second universal connection portion 55, and the connection arm portion 50 has a distance between the other end of the crank arm portion and the movable portion. As long as the position and orientation other than the distance are fixed and can be freely changed, the configuration is arbitrary as long as the object of the present invention is not violated.

  Further, in the present embodiment, the direct acting actuator unit 40 is configured by a hydraulic actuator. However, the present invention is not limited to this. For example, an actuator other than hydraulic such as an electric actuator is used. It may be comprised.

  In the present embodiment, the linear actuator 40 is provided at the lower end of the frame 14 (that is, in the vicinity of the base upper surface 11a). However, the present invention is not limited to this. It may be provided directly on the upper surface 11a.

  In the present embodiment, the connecting rod portion 44 is provided with a first connecting portion 45 and a second connecting portion 46 each having a uniaxial joint mechanism at both ends thereof, and the second connecting portion 46 causes the crank arm portion 43 to be provided. Although it has been configured to absorb the displacement in the horizontal direction of the first connecting portion 45 due to the swinging of the first connecting portion 45, it is not limited to this. For example, the first connecting portion 45 is a single-shaft joint mechanism, and a long hole bearing is provided at one end 43a of the crank arm portion 43 so that the shaft portion 45a of the first connecting portion 45 is movable, and the second connecting portion. A configuration in which 46 is fixed to the piston tip 42a and attached may be used. That is, as long as the connecting rod portion 44 is configured to absorb the displacement caused by the swing of the crank arm portion 43, the configuration thereof is arbitrary as long as it does not contradict the purpose of the present invention.

  In the present embodiment, the fixed portion 15 is configured by a load cell capable of measuring a load. However, the present invention is not limited to this, and a simple trapezoidal structure having no load measuring function is used. It may be a configuration provided, or may be a configuration in which the central portion of the base upper surface 11a is a fixed portion 15.

  In the present embodiment, the thermostat 70 is provided. However, the present invention is not limited to this. For example, when the material is not easily affected by the environmental conditions of the device under test TP. Further, a configuration in which the constant temperature bath 70 is not provided may be employed. Moreover, in this embodiment, the thermostat 70 accommodates the whole fixing | fixed part 15, However, It is not limited to this, At least the location which mounts the to-be-tested object TP in the fixing | fixed part 15 is accommodated. What is necessary is just to be comprised so that it may do.

  In the present embodiment, the lid portion 72 of the thermostatic chamber 70 is configured by the frame portion 73 and the sheet member 74, but the entire lid portion 72 may be configured by the sheet member 74, for example. Further, the sheet member 74 is also configured by stacking a plurality of single-layer sheets 75, but may be configured by a single single-layer sheet.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Excitation apparatus 11 Base 11a Base upper surface 14 Frame 15 Fixed part 20 Movable part 21 Movable part main body 22 Contact part 23 Connection part 30 Excitation unit 31 Actuator unit 40 Direct acting actuator part 41 Cylinder 42 Piston 43 Crank arm part 44 Connection Rod part 50 Connection arm part 51 Upper arm part 52 Forearm part 53 Rotation connection part 54 First universal connection part 55 Second universal connection part 70 Constant temperature bath 71 Peripheral wall part 72 Lid part 73 Frame part 74 Sheet member 75 Single layer sheet TP Tested body

Claims (7)

A fixing part on which the device under test is placed;
A movable part that sandwiches the device under test with the fixed part and is provided so that its position and orientation can be freely changed with respect to the fixed part;
And a vibration unit that applies vibrations in six axial directions to the movable portion. A base provided on the upper surface with the fixing portion;
A frame erected on the upper surface of the base,
The vibration unit has six actuator units, and each of the actuator units includes a linear actuator part provided around the fixed part and on the upper surface of the base or in the vicinity thereof, and the movable part in the frame. A crank arm portion swingably provided in a seesaw shape at a position higher than the portion, a connecting rod portion connecting the linear motion actuator portion and one end of the crank arm portion, the other end of the crank arm portion, and the 2. The vibration device according to claim 1, further comprising: a connecting arm portion that connects the movable portion to each other so that a distance from each other is constant and a position and orientation other than the distance can be freely changed.   The vibration device according to claim 1, wherein the fixed portion is configured by a load cell capable of measuring a load.   The vibration apparatus according to any one of claims 1 to 3, further comprising a thermostatic chamber that accommodates at least a portion of the fixing portion where the object to be tested is placed. The movable part has a movable part main body, and a contact part that is provided at a lower part of the movable part main body and comes into contact with the device under test.
The thermostat has a peripheral wall portion that at least surrounds the place where the test object is placed in the fixed portion, and a lid portion that is provided so as to cover and cover the upper end of the peripheral wall portion,
At least a part of the lid is made of a flexible sheet member,
The vibration device according to claim 4, wherein the contact portion is disposed through the sheet member.   The vibration device according to claim 5, wherein the sheet member is configured by stacking a plurality of single-layer sheets on each other.   The vibration device according to claim 5 or 6, wherein the sheet member is made of silicone rubber as a main material.

Images