WO2016076157A1

WO2016076157A1 - Test piece attachment apparatus for vibration testing apparatus

Info

Publication number: WO2016076157A1
Application number: PCT/JP2015/080944
Authority: WO
Inventors: 秀修青木; 中村　勝彦; 一志中西
Original assignee: Imv株式会社
Priority date: 2014-11-10
Filing date: 2015-11-02
Publication date: 2016-05-19
Also published as: JP2016090512A; JP5923156B2

Abstract

The present invention obtains a test piece attachment apparatus for a vibration testing apparatus that reduces the cross-talk acceleration generated in the vibration testing apparatus during vibration testing and enhances the accuracy of vibration testing along only the Z axis compared to the prior art. A vibration testing apparatus 200 has a vibration generator 11 for generating vibration, a vibration table 12 that can be vibrated, a weight 13 and L-shaped vibration tool 14 that are a test piece, and a test piece attachment apparatus 15. The test piece attachment apparatus 15 has an upper plate 16, a lower plate 17, an elastic member 18, a connecting rod 19, and bearings 20. The elastic member 18 applies elastic force between the upper plate 16 and lower plate 17 in a direction that causes the upper plate 16 and lower plate 17 to separate. One end of the connecting rod 19 is connected to the lower side of the upper plate 16 via a bearing 20 so as to be capable of vibrating and the other end is connected to the upper side of the lower plate 17 via a bearing 20 so as to be capable of vibrating.

Description

Specimen mounting device for vibration test equipment

The present invention relates to a specimen mounting apparatus for a vibration test apparatus.

Conventionally, a vibration test apparatus that vibrates a specimen such as an industrial product is known (for example, see Patent Document 1). Here, FIG. 1A shows a general configuration of a conventional vibration test apparatus. A conventional vibration test apparatus 100 in FIG. 1A includes a vibration generator 1 that generates vibration, a vibration table 2 that can vibrate, a weight 3 and an L-shaped vibration jig 4 that are examples of a specimen, have. Although not shown, the vibration generator 1 is an electrodynamic vibration generator including, for example, an excitation coil, a drive coil, a vibration transmission shaft, and an excitation power source. The vibration transmission shaft of the vibration generator 1 is connected to the lower surface of the vibration table 2 so that the vibration table 2 can vibrate in the Z-axis direction. An L-shaped vibration jig 4 to which a weight 3 can be attached is fixed on the vibration table 2.

In such a vibration test apparatus 100, a magnetic field is generated by passing an exciting current through an exciting coil using an exciting power source. When a driving current is passed through a driving coil existing in the magnetic field, an exciting force is generated. When the excitation force acts on the vibration table 2, the vibration table 2 vibrates in the vertical direction, and the specimen (the weight 3 and the L-shaped vibration jig 4) fixed on the vibration table 2 moves in the Z-axis direction. It comes to vibrate.

JP 2003-149077 A

However, in the conventional vibration test apparatus 100, the crosstalk acceleration in the horizontal direction is likely to occur in the weight 3 and the L-shaped vibration jig 4 during the vibration test, and this is caused by the unintended horizontal crosstalk acceleration. The accuracy of the vibration test for only the Z-axis direction of the vibration test apparatus 100 may be reduced.

Accordingly, the present invention is a vibration test that can be installed in a vibration test apparatus to reduce crosstalk acceleration that occurs during the vibration test in the vibration test apparatus, and to have better excitation accuracy than before. It aims at providing the specimen mounting apparatus of an apparatus.

(1) The present invention is a specimen mounting device for a vibration testing apparatus that includes a vibration generator and a vibration table that can vibrate and transmit vibration from the vibration generator, and vibrates the specimen. The first member that can fix the specimen to the upper side, the second member that can connect the vibration table to the lower side, and the first member can rotate with respect to the second member. And a turning mechanism configured as described above.

According to the specimen mounting device of the vibration test apparatus of (1) above, it is possible to quickly and accurately cancel the moment generated in the horizontal direction at a position higher than the specimen mounting apparatus in the vibration testing apparatus. Therefore, when used in the vibration test apparatus, the specimen that can reduce the crosstalk acceleration that occurs during the vibration test and is superior in the accuracy of the vibration test only in the Z-axis direction as compared with the prior art. An attachment device can be provided. In addition, by using the specimen mounting device of the vibration test apparatus of (1) above, it is possible to apply a relatively small load to the vibration test apparatus during the vibration test, so that the vibration test apparatus is not damaged. Can be.

(2) In the specimen mounting device of (1) above, the rotation mechanism is provided between the first member and the second member so that the first member and the second member are separated from each other. An elastic member that biases an elastic force in any direction, and one end of the elastic member inside the elastic member is swingably connected to the lower side of the first member via a bearing portion of a spherical bearing structure, and the other end Has a plurality of rod-like members that are swingably connected to the upper side of the second member via a bearing portion of a spherical bearing structure, and the plurality of adjacent rod-like members are on the same circle. Are preferably arranged at equal intervals.

(3) As another aspect, in the specimen mounting device of (1) above, the rotation mechanism is provided between the first member and the second member, and the first member and the second member are provided. An elastic member that urges an elastic force in a direction away from the member, and a plurality of substantially spherical bearings provided in contact with the first member and the second member inside the elastic member; It may have.

According to the specimen mounting device of the vibration test apparatus of (1) above, since the first member can swing with good balance during operation, the horizontal direction generated at a position higher than the specimen mounting apparatus in the vibration testing apparatus. Can be canceled more quickly and accurately. Therefore, it is possible to provide a specimen mounting device that can be excellent in the accuracy of the vibration test only in the Z-axis direction by being attached to the vibration test device.

(4) In the specimen mounting device of (2) or (3) above, it is preferable that the elastic member is a hollow ring-shaped portion.

According to the specimen mounting device of the vibration test device of (4) above, since the elastic member is lightweight, a moment is hardly generated. Therefore, it is possible to provide a specimen mounting device that can be more excellent in test accuracy than the specimen mounting device according to (2) or (3) by being attached to the vibration testing device.

(5) As another aspect, in the specimen mounting device according to (1), the rotation mechanism includes a bearing mechanism constituted by the first member and the second member, and the bearing mechanism However, it may be a fluid bearing mechanism that allows the first member to rotate with respect to the second member via a fluid. In the specimen mounting device of (5) above, a gap serving as a play portion in the horizontal direction may be provided between the first member and the second member.

According to the specimen mounting device of the vibration test apparatus of (5) or (6) above, the first member can be smoothly rotated with respect to the second member, and therefore, a moment is hardly generated.

(A) is a schematic block diagram of the conventional vibration test apparatus, (b) is a schematic block diagram of the vibration test apparatus which concerns on embodiment of this invention. It is sectional drawing of the specimen attachment apparatus of the vibration test apparatus of FIG.1 (b). It is a disassembled perspective view of the specimen attachment apparatus of the vibration test apparatus of FIG.1 (b). It is a figure which shows the member around a connecting rod in the test body attachment apparatus of the vibration test apparatus of FIG.1 (b), Comprising: (a) is a perspective view, (b) is a disassembled perspective view. It is a model figure for demonstrating the principle of the specimen mounting apparatus of the vibration test apparatus in embodiment of this invention. (A) is a graph which shows the result in a comparative example, (b) is a graph which shows the result in the Example of this invention. It is a schematic block diagram of the vibration test apparatus which concerns on the modification of this invention. It is a schematic block diagram of the vibration test apparatus which concerns on another modification of this invention, Comprising: One part is shown with sectional drawing.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1B is a schematic configuration diagram of a vibration test apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the specimen mounting device, FIG. 3 is an exploded perspective view of the specimen mounting apparatus, and FIG. ) Is a perspective view of the connecting rod, and FIG. 4B is an exploded perspective view of the connecting rod. In the following description, the horizontal direction is the X-axis and Y-axis directions, and the vertical direction is the Z-axis direction.

(Configuration of vibration test apparatus 200)

1B, a vibration test apparatus 200 according to the embodiment of the present invention includes a vibration generator 11 that generates vibration, a vibration table 12 that can vibrate, a weight 13 that is a specimen, and an L-shaped vibration jig 14. And a specimen mounting device 15. These will be specifically described below.

Although not shown, the vibration generator 11 includes, for example, an excitation coil, a drive coil, a vibration transmission shaft, and an excitation power source. Further, the vibration transmission shaft of the vibration generator 11 is connected to the lower surface portion of the vibration table 12 so that the vibration table 12 can vibrate in the Z-axis direction. Further, as shown in FIG. 1B, a specimen mounting device 15 is provided on the vibration table 12, and an L-shaped additive capable of attaching a weight 13 is provided on the specimen mounting device 15. A vibration jig 14 is fixed.

As shown in FIGS. 2 and 3, the specimen mounting device 15 includes an upper plate (first member) 16, a lower plate (second member) 17, an elastic member 18, a connecting rod (rod-shaped member) 19, and a bearing portion. 20.

The upper surface of the upper plate 16 is a mounting surface for the specimen. A vibration table 12 is connected to the lower surface of the lower plate 17 so that vibration generated by the vibration generator 11 is transmitted via the vibration table 12.

The elastic member 18 is made of rubber or a spring and urges an elastic force between the upper plate 16 and the lower plate 17 in such a direction that the upper plate 16 and the lower plate 17 are separated from each other. Thereby, in the initial state before the vibration test, the connecting rod 19 is substantially upright. In addition, in the elastic member 18 of this embodiment, although the hollow ring-shaped part made from rubber | gum is used, you may use a coil spring.

The connecting rod 19 and the bearing portion 20 constitute a swing mechanism that allows the upper plate 16 to swing relative to the lower plate 17. Specifically, in an initial state (a state in which the connecting rod 19 is upright in a substantially vertical direction), three locations are arranged at 120 ° intervals in the circumferential direction on the same circle centering on the central axis of the upper plate 16 and the lower plate 17. Are equally spaced. One end of the connecting rod 19 is swingably connected to the lower side of the upper plate 16 via the bearing portion 20, and the other end is swingable to the upper side of the lower plate 17 via the bearing portion 20. It is connected to the.

As shown in FIGS. 2, 4 (a), and 4 (b), the bearing portion 20 includes a rod end bearing 21, a hinge pin 22, a bracket 23, and a fastener 24. The rod end bearing 21 can be fitted to a hole 19a provided at one end and the other end of the connecting rod 19 so as to be rotatable about an axis. The rod end bearing 21 has a ring-shaped portion 21a and a sliding member 21b fitted to the inner peripheral portion of the ring-shaped portion 21a. In the sliding member 21b, a portion of the outer peripheral surface that can contact the inner peripheral portion of the ring-shaped portion 21a has a spherical shape that is substantially the same as the shape of the inner peripheral portion of the ring-shaped portion 21a. A spherical bearing structure is formed together with the inner peripheral portion. The sliding member 21b has a hole 21b ₁ into which a hinge pin 22 that is a rod-like member can be inserted so as to be rotatable around an axis. The bracket 23 is fixed on the lower side of the upper plate 16 and the lower one is fixed on the upper side of the lower plate 17. Fastener 24, as shown in FIGS. 2 and 4 (a), after inserting the hinge pin 22 in the hole 21b _1, a member to fasten the hinge pin 22 so as not to displaced in the insertion direction from the predetermined position.

(Operation of vibration test apparatus 200)
Next, the operation of the vibration test apparatus 200 will be described. When the vibration generator 11 is operated after the L-shaped vibration jig 14 to which the weight 13 is attached is installed on the upper plate 16, the lower plate 17 is vibrated in the Z-axis direction, and the lower plate 17, the bearing portion 20, The connecting rod 19, the elastic member 18, the upper plate 16, the weight 13 as the specimen, and the L-shaped vibration jig 14 vibrate in the Z-axis direction. At this time, moments may be generated in the X and Y plane directions in the weight 13, the L-shaped vibration jig 14, and the upper plate 16, but according to the vibration test apparatus 200, the generated X and Y planes are generated. The moment in the direction can be canceled quickly and accurately.

Here, the principle of the moment canceling operation in the vibration test apparatus 200 will be described with reference to the model diagram of FIG. The part 16 ′ is a part viewed from the upper plate 16, the part 17 ′ is a part viewed from the lower plate 17, the part 19 ′ is a part viewed from the connecting rod 19, and the part 20 ′ is a part viewed from the bearing portion 20. As shown in FIG. 5, the region 16 ′, 17 ′ is elastically biased by the elastic member 18 (not shown in FIG. 5) (Z-axis high rigidity) is urged in the direction of the arrow. 'Is swingable with respect to the region 17' (translational motion and rotational motion are possible in the X and Y planes). In such a configuration, when an excitation force (see FIG. 5) from the vibration generator 11 (not shown in FIG. 5) is transmitted to the part 17 ′, a part (main part) of the part 16 ′ or more depends on the excitation force. In the embodiment, moments may be generated in the X and Y plane directions in the weight 13, the L-shaped vibration jig 14, and the upper plate 16). At this time, as shown in FIG. 5, the part 16 ′ swings in the X and Y planes (translational movement and rotational movement in the X and Y planes), and this moment can be canceled by this movement.

According to the specimen mounting device 15 having the above-described configuration, the moment generated in the X and Y plane directions can be canceled for the weight 13, the L-shaped vibrating jig 14, and the upper plate 16. Therefore, by installing in the vibration test apparatus 200, the crosstalk acceleration generated during the vibration test in the vibration test apparatus 200 is reduced, and the vibration test accuracy only in the Z-axis direction is superior to the conventional one. It is possible to provide a specimen mounting device 15 that can be used. In addition, by using the specimen mounting device 15, it is possible to apply a relatively small load to the vibration test device 200 during the vibration test, so that the vibration test device 200 can be prevented from being damaged.

Further, since the elastic member 18 in the specimen mounting device 15 is light, a moment is hardly generated in the X and Y plane directions. Therefore, the vibration test apparatus 200 having excellent vibration test accuracy only in the Z-axis direction can be obtained.

As an example, an experiment for confirming the effect was performed in the vibration test apparatus 200 in the above embodiment. Specifically, it is as follows. As the L-shaped vibrating jig 14 (with the weight 13 attached), the “total mass of 173 kg, the center of gravity offset amount 65.7 mm” and the specimen mounting device 15 of “total mass 35 kg” were used. In addition, a sweep test (excitation in the vertical Z-axis direction (velocity: 1.0 m / s, acceleration: 100 m / s ² )) with an excitation condition of 5 Hz to 200 Hz was performed. FIG. 6A shows a graph (comparative example) showing the experimental results of the vibration test apparatus 100 having the configuration of FIG. 1A to which the specimen mounting device 15 is not attached, and shows the experimental results of the examples according to the present invention. Is shown in FIG.

From the results of the comparative example of FIG. 6 (a), the in vibration test apparatus 100, in case of vibration at 100 m / s ^2, crosstalk acceleration 100 m / s ² is generated at a frequency of less than 100 Hz. Specifically, the crosstalk resonance frequency was 40 Hz, and the amount of crosstalk with respect to the main axis at this time (evaluated by acceleration at the center of the weight 3) was 100%.

On the other hand, from the result of FIG. 6B, in the vibration test apparatus 200, the crosstalk resonance frequency is 18 Hz, and the crosstalk amount (evaluated by the acceleration at the center of the weight 13) at this time is 35. %It can be seen that it is. However, in this test, since the acceleration area is constant at 100 m / s ^{2 at} 30 Hz or higher, the crosstalk acceleration is suppressed to about 10 m / s ² or lower. Therefore, from this example, the moment generated in the X and Y plane directions of the L-shaped vibration jig 14 and the specimen mounting apparatus 15 with the weights 13 attached to the specimen mounting apparatus 15 of the vibration testing apparatus 200 is canceled. I understood that I was able to. That is, it can be seen that the vibration test apparatus 200 in which the specimen mounting device 15 is installed can reduce the crosstalk acceleration generated during the vibration test in the vibration test apparatus 200 and can have higher test accuracy than before. It was.

The embodiment of the present invention has been described above, but only specific examples are illustrated, and the present invention is not particularly limited, and the specific configuration and the like can be appropriately changed in design. Further, the actions and effects described in the embodiments of the invention only list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what was done.

For example, as shown in the vibration test apparatus 300 of FIG. 7, instead of the connecting rod 19 and the bearing portion 20 of the above embodiment, an upper plate and a lower plate similar to the upper plate 16 and the lower plate 17 of the above embodiment. A specimen mounting device 35 having a rocking mechanism using a substantially spherical bearing 35a that is in contact with both the upper plate and the lower plate. Here, reference numeral 31 is a vibration generator, reference numeral 32 is a vibration table, reference numeral 34 is an L-shaped vibration jig, and the other components are the same as those in the above embodiment, and thus description thereof is omitted. When the upper plate is vibrated in the Z-axis direction, the upper plate displaced in the horizontal direction due to the occurrence of the crosstalk acceleration is caused to move to the bearing by the elastic force of the elastic member similar to the elastic member 18 of the above embodiment. While sliding on 35a, it is possible to return to the position before the vibration test (initial state). By such a specimen mounting device 35, the upper plate can swing with respect to the lower plate as in FIG. 5 shown in the above embodiment (translational movement and rotational movement are possible in the X and Y planes). Therefore, the same effect as the above embodiment can be obtained.

Further, for example, as shown in the vibration test apparatus 400 of FIG. 8, instead of the upper plate 16, the lower plate 17, the elastic member 18, the connecting rod 19, and the bearing portion 20 of the above embodiment, the upper plate 46 and the lower plate 47. It is good also as the specimen attachment apparatus 45 using this. Here, the upper plate 46 includes a cylindrical shaft portion 46a coaxial with the central axis of the lower plate 47 fixed on the vibration table 42, a disc-shaped portion 46b supported by the shaft portion 46a, and a circular shape. A first ring-shaped portion 46c provided at the lower portion of the plate-shaped portion 46b, a second ring-shaped portion 46d provided at the lower portion of the first ring-shaped portion 46c, and

pipes

46e, 46f, 46g, 46h, 46i, 46j. The second ring-shaped portion 46d has an inner diameter smaller than the inner diameter of the first ring-shaped portion 46c, and the outer diameter is the same as the outer diameter of the first ring-shaped portion 46c. Further, the pipe 46e is branched into a T-shaped tube 46e ₁ formed inside at a part of the first ring-shaped portion 46c, a part of which communicates with the outside, and a T-shaped tube 46e ₁ at one end. A tube 46e ₂ formed inside the disc-shaped portion 46b so as to be connected to one end of the portion, and a second ring so that one end is connected to the other end of the branched portion of the T-shaped tube 46e ₁ A tube 46e ₃ formed in the inner portion 46d. Piping 46f, in the interior of the disc-shaped portion 46b is formed along a substantially horizontal direction, one end of which is connected to the other end of the tube 46e _2, the other end is connected to one end of the pipe 46 g. The pipe 46g is formed along the substantially vertical direction inside the disk-like part 46b, one end is connected to the other end of the pipe 46f, and the other end is on the upper surface of a flange part 47b ₁ of the lower plate 47 described later. Open toward. Pipe 46h is formed along the circumferential direction inside the second ring-shaped portion 46d, one end connected to the other end of the tube 46e _3, the other end is connected to one end of the pipe 46i. Pipe 46i is formed along a substantially vertical direction inside the second ring-shaped portion 46d, one end connected to the other end of the pipe 46h, the other end of the flange portion 47b ₁ of the lower plate 47 described later Open to the bottom. The pipe 46j is formed so as to communicate the inner diameter side and the outer diameter side of the first ring-shaped part 46c in a part of the first ring-shaped part 46c opposite to the pipe 46e.

The lower plate 47 includes a base 47a, a substantially cylindrical portion 47b provided on the top of the base 47a, and a recess 47c formed inside the substantially cylindrical portion 47b. The upper portion of the substantially cylindrical portion 47b has an inverted L-shaped cross section, and a flange portion 47b ₁ is formed. The flange portion 47b ₁ is located in a space surrounded by the disk-shaped portion 46b, the first ring-shaped portion 46c, and the second ring-shaped portion 46d.

The upper plate 46 is configured to be rotatable with respect to the lower plate 47 in a state where the shaft portion 46 a is inserted into a recess 47 c provided at the center of the lower plate 47. Further, the gap 61 between the _first ring-shaped portion 46c and the flange portion 47b1, the gap 62 between the second ring-shaped portion 46d and the substantially cylindrical portion 47b, and between the shaft portion 46a and the recessed portion 47c. The gap 63 allows the upper plate 46 to move about 6 mm in the horizontal direction with respect to the lower plate 47. Furthermore, a wide space 60 is provided inside the gap 61. Further, inside the flange portion 47 b ₁ , one end is connected to the space 60, the other end is connected to the gap 63, and a communication pipe 64 that connects the space 60 and the gap 63 is formed. Further, inside the substantially cylindrical portion 47b, one end is connected to the gap 62, the other end is connected to the gap 63, and a communication pipe 65 that communicates the

gaps

62 and 63 is formed. The upper plate 46 and the lower plate 47 are mainly composed of a disk-shaped portion 46b, a first ring-shaped portion 46c, a second ring-shaped portion 46d, and a substantially cylindrical portion 47b. A mechanism (rotating mechanism) can be configured. Hereinafter, the fluid dynamic bearing mechanism will be specifically described.

The fluid sent from the reservoir 51 to the pipe 46e of the upper plate 46 by the pump 50 flows into the

pipes

46f and 46h of the upper plate 46, and then flows into 46g and 46i, respectively. Subsequently, fluid is piping 46 g, from 46i, (not shown) small gap between the disk-like portion 46b and the flange portion 47b _1, between the second ring-shaped portion 46d and the flange portion 47b ₁ After being pushed out from the minute gaps (not shown), they flow into the

respective gaps

61, 62, 63. At this time, a minute gap (not shown) between the disc-like part 46b and the flange part 47b ₁ and a minute gap (not shown) between the second ring-like part 46d and the flange part 47b ₁ are respectively shown. always because fluid pressure is applied there to, in a disk-like portion 46b and the flange portion 47b _1, a state of not directly contact the second ring-shaped portion 46d and the respective vertical to the flange portion 47b ₁ Yes. Next, the fluid in the gap 61 flows directly into the space 60, the fluid in the gap 62 flows into the gap 63 through the communication pipe 65, and the fluid in the gap 63 flows into the space 60 through the communication pipe 64. The fluid in the space 60 flows out through the piping 46j of the first ring-shaped portion 46c. Then, the fluid is returned to the storage unit 51 via the pipe 53. The fluid bearing mechanism is made to function by constantly repeating this series of fluid flow steps, and the upper plate 46 can be smoothly rotated with respect to the lower plate 47. Reference numeral 41 denotes a vibration generator, reference numeral 42 denotes a vibration table, and reference numeral 44 denotes an L-shaped vibration jig. Reference numeral 48 denotes a buffer member such as rubber. In addition, since

gaps

61, 62, 63 serving as play portions are provided between the upper plate 46 and the lower plate 47, the upper plate 46 and the lower plate 47 are difficult to directly contact in the horizontal direction. It has become. Reference numeral 49 denotes a sealing member made of polytetrafluoroethylene or the like. According to such a specimen mounting device 45, the upper plate 46 can be smoothly rotated with respect to the lower plate 47 by the fluid dynamic bearing mechanism, and the horizontal plate is provided between the upper plate 46 and the lower plate 47. Since the

gaps

61, 62, and 63 serving as play portions in the direction are provided, it is possible to move in the horizontal direction, so that the same effect as the effect of canceling the moment by the oscillating motion among the effects of the above embodiment can be obtained. be able to.

Further, the connecting rod 19 and the bearing portion 20 of the above embodiment are on the same circle around the central axes of the upper plate 16 and the lower plate 17 in the initial state (the state in which the connecting rod 19 stands up in a substantially vertical direction). Although it arrange | positions equally at three places at intervals of 120 degree | times in the circumferential direction, it is not restricted to this, The connecting rod 19 and the bearing part 20 should just be plural. However, when a plurality of connecting rods 19 and bearing portions 20 are provided, the same circle centering on the central axes of the upper plate 16 and the lower plate 17 in the initial state (the state in which the connecting rod 19 is upright in a substantially vertical direction). It is preferable to arrange them at equal intervals on the top.

1, 11, 31, 41

Vibration generators

2, 12, 32, 42 Shaking table 3, 13

Weights

4, 14, 34, 44 L-shaped

vibration jigs

5, 15, 35, 45

Specimen mounting devices

16, 46 Upper plate 17, 47 Lower plate 18 Elastic member 19 Connecting rod 19a Hole 20 Bearing portion 21 Rod end bearing 21a Ring-shaped portion 21b Sliding member 21b ₁ hole 22 Hinge pin 23 Bracket 24 Fastener 35a Bearing 46a Shaft portion 46b Disc-shaped portion 46c One ring-shaped portion 46d Second ring-shaped portions 46e to 46j, 52, 53 Piping 47a Base 47b Cylindrical portion 48 Buffer member 49 Seal member 50 Pump 51 Storage portion 60

Space

61, 62, 63

Clearance

64, 65

Communication pipe

100, 200, 300, 400 Vibration test equipment

Claims

A test specimen mounting device for a vibration test apparatus comprising a vibration generator and a vibration table that transmits vibration from the vibration generator and can vibrate.
A first member capable of fixing the specimen to the upper side;
A second member connectable to the lower side of the shaking table;
A rotation mechanism configured such that the first member is rotatable with respect to the second member;
A specimen mounting device for a vibration test apparatus, characterized by comprising:
The turning mechanism is
An elastic member that is provided between the first member and the second member and urges an elastic force in such a direction that the first member and the second member are separated from each other;
Inside the elastic member, one end is swingably connected to the lower side of the first member via a bearing portion of the spherical bearing structure, and the other end is connected to the upper side of the second member. A plurality of rod-like members that are swingably connected via a bearing portion;
With
The test piece mounting apparatus for a vibration test apparatus according to claim 1, wherein the plurality of adjacent bar-shaped members are arranged side by side at equal intervals on the same circle.
The turning mechanism is
An elastic member that is provided between the first member and the second member and urges an elastic force in such a direction that the first member and the second member are separated from each other;
Inside the elastic member, a plurality of substantially spherical bearings provided to contact the first member and the second member;
The specimen mounting device for a vibration test apparatus according to claim 1, wherein
The specimen mounting device for a vibration test apparatus according to claim 2 or 3, wherein the elastic member is a hollow ring-shaped portion.
The rotation mechanism has a bearing mechanism constituted by the first member and the second member;
2. The specimen mounting device for a vibration test apparatus according to claim 1, wherein the bearing mechanism is a fluid bearing mechanism that allows the first member to rotate with respect to the second member via a fluid. .
6. The specimen mounting device for a vibration test apparatus according to claim 5, wherein a gap serving as a play portion is provided in a horizontal direction between the first member and the second member.