JP2004093366A - Multiple-axle vibration testing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the reliability, durability, and degree of design freedom of a machine by heightening the upper limit of excitation frequencies and increasing allowable moment. <P>SOLUTION: This multiple-axis vibration testing machine is provided with both a plurality of vibrating devices for linearly vibrating a vibrating table 3 in different directions and a frame body 2 for supporting the vibrating table 3 via a plurality of bearing parts 5. Each bearing pat 5 supports the vibrating table 3 while restricting the movements of the vibrating table 3 in a vibrating direction by one vibrating device 4 and allows the movements of the vibrating table 3 in vibrating directions by the other vibrating devices 4. At least one of the bearing parts 5 is provided with both a biasing means for biasing a support part of each bering part 5 toward the vibrating table 3 and a biasing force adjusting means for adjusting the biasing force of the biasing means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multi-axis vibration testing machine for placing a sample on a shaking table and vibrating the shaking table to perform a vibration test on the sample.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this kind of multi-axis vibration tester, a multi-axis vibration test machine in which a vibration table on which a sample body is mounted is vibrated in a plurality of directions by a plurality of vibration devices is known.
[0003]
The multi-axis vibration tester includes a plurality of frames that support the vibrating table via bearings. Each frame is arranged outside each side surface and lower surface except for the upper surface of the vibration table on which the sample body is placed. Each bearing section has a hydrostatic bearing that supports the vibration table by hydraulic pressure, and the static pressure bearing of each bearing section is connected to an oil communication pipe arranged outside the vibration table and through which oil flows inside. As a result, the hydraulic pressure of each hydrostatic bearing becomes substantially the same, and the vibration table is automatically aligned.
[0004]
Further, each hydrostatic bearing supports the shaking table by restricting the movement of the shaking table in the normal direction, and allows the movement of the shaking table in other directions. Thus, the input from one vibration device is transmitted to the vibration table irrespective of the input from another vibration device.
[0005]
By the way, the bearings arranged outside the opposing side surfaces of the shaking table are connected by preload bolts. By rotating the preload bolt, the distance between the connected frames changes, and the oil film thickness of the hydrostatic bearing sandwiched between the frames and the vibration table changes. That is, before the vibration test is performed, the initial supporting force of each bearing portion can be adjusted by the preload bolt, and deformation of the device due to thermal expansion is allowed.
[0006]
[Problems to be solved by the invention]
However, in the multi-axis vibration testing machine, during the vibration test, the preload bolt, which is a long member, easily resonates, and when the vibration frequency is increased, the influence of the resonance of the preload bolt on the vibrating table increases, and an effective test is performed. There was a possibility that the result could not be obtained.
If the pitch between the bearings is increased to increase the allowable moment of the device, the preload bolt becomes longer, which also limits the upper limit of the vibration frequency. That is, there is a problem that the degree of freedom in designing the device cannot be improved.
[0007]
The present invention has been made in view of the above circumstances, and an object thereof is to increase the upper limit of the excitation frequency and increase the allowable moment to improve the reliability durability and the degree of design freedom of the device. It is to provide a multi-axis vibration testing machine that can perform the test.
[0008]
[Means for Solving the Problems]
To achieve the above object, for example, as shown in FIGS. 1 to 3,
In the invention according to claim 1,
A vibration table (3) on which the sample body is placed;
A plurality of vibrating means (for example, a vibrating device 4) for linearly vibrating the vibrating table in directions different from each other;
A frame (2) for supporting the shaking table via a plurality of bearings (5);
Each of the bearings is installed in correspondence with each of the vibrating means, regulates movement of the vibrating table in the vibrating direction by one vibrating means, supports the vibrating table, and supports the other vibrating table. In a multiaxial vibration tester (1) configured to allow movement of the shaking table in a vibration direction by a vibration means,
At least one of the bearing units includes an urging unit that urges a supporting portion of each bearing unit toward the vibration table, and an urging force adjusting unit that adjusts an urging force of the urging unit. Features [0009]
According to the first aspect of the present invention, the supporting portion of each bearing portion is configured to be urged to the vibration table by the urging means, and the urging force is adjusted by the urging force adjusting means. It is possible to adjust the initial supporting force of the part. That is, unlike the related art, there is no need to provide a preload bolt that inserts the shaking table to connect the opposing bearings and tightens the bearings to provide an initial support force.
[0010]
According to the second aspect of the present invention, in the multi-axis vibration testing machine according to the first aspect,
Each of the bearing units has a hydrostatic bearing (8) for supporting the vibration table by hydraulic pressure,
The frame is disposed facing the outside of at least one vibration direction in the vibration table,
A connecting member (2a) for connecting the frame bodies arranged opposite to each other;
An oil communication pipe (6), which is arranged in the connecting member and connected to the hydrostatic bearings of the bearing portions of the frame body opposed to each other, and through which oil flows, is provided. I do.
[0011]
According to the second aspect of the invention, in addition to the operation of the first aspect, when the vibrating table is vibrated by each of the vibrating means, the oil of the hydrostatic bearing of each bearing portion is communicated by the oil communication pipe. Therefore, the hydraulic pressure, oil film, and the like of the hydrostatic bearing of each bearing portion are substantially equal. As a result, the vibration table is automatically aligned with respect to each frame. That is, for example, the hydraulic pressure in each bearing section becomes uneven, and the posture of the shaking table does not tilt with respect to the excitation axis, and the rigidity of each bearing section does not become unbalanced. It can vibrate stably.
In addition, since the oil communication pipes of the bearings are arranged inside the connecting member, the bearings are linearly communicated with each other by the oil communication pipes.
[0012]
According to a third aspect of the present invention, in the multi-axis vibration testing machine according to the second aspect,
The biasing unit may include a spring member that expands and contracts in a vibration direction of the corresponding vibration unit with the bearing unit provided with the biasing unit, and biases the hydrostatic bearing toward the vibration table. Features.
[0013]
According to the third aspect of the present invention, in addition to the function of the second aspect, a spring member that expands and contracts in the vibration direction is disposed on the bearing portion, and the hydrostatic bearing is urged toward the shaking table to thereby provide the hydrostatic bearing. , And as a result, an initial supporting force is applied to the bearing portion.
[0014]
According to the fourth aspect of the present invention, in the multi-axis vibration testing machine according to the third aspect,
The urging force adjusting means includes a bolt (13) which is screwed with the frame body and adjusts the amount of extension of the spring member according to a tightening amount.
[0015]
According to the fourth aspect of the invention, in addition to the operation of the third aspect, the amount of expansion of the spring member is adjusted by adjusting the tightening amount of the bolt, and the biasing force applied to the hydrostatic bearing from the spring member is adjusted. can do. Thereby, an operator or the like can adjust the initial supporting force.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 show an embodiment of the present invention. FIG. 1 is an external perspective view of a multi-axis vibration tester, FIG. 2 is an external perspective view of a vibration table and a frame body, and FIG. 3 is a vibration table and a frame. It is a partial side sectional view of a body.
[0017]
As shown in FIG. 1, the multi-axis vibration tester 1 includes a plurality of frames 2, a vibrating table 3 arranged inside each of the frames 2 and on which a sample body is placed, and a vibration table 3. And a plurality of vibrating devices 4 that vibrate. The vibration table 3 is supported by the frame 2 via a plurality of bearings 5. In the present embodiment, as shown in FIG. 1, two vibrating devices 4 are provided, one vibrating device 4 vibrates the vibrating table 3 in the X direction (front-back direction), and the other vibrating device 4 Vibrates the vibrating table 3 in the Z direction (vertical direction). That is, each of the vibration devices 4 vibrates the vibration table 3 linearly in different directions. As each of the vibration devices 4, for example, an electrodynamic vibration generator that includes an exciting coil, a movable coil, and the like, and vibrates the vibration table 3 by passing a current through the movable coil is known. Each of the vibrating devices 4 is the same as a conventionally known one, and thus will not be described in detail here.
[0018]
As shown in FIG. 2, the vibration table 3 is formed in a substantially rectangular parallelepiped shape, and each surface of the vibration table 3 is supported by each bearing unit 5 except for the upper surface on which the sample is placed. In the present embodiment, the frame 2 is disposed outside each surface except for the upper surface of the vibration table 3, and the vicinity of four corners of each surface except for the upper surface of the vibration table 3 is supported by each bearing portion 5. Is done. Each bearing 5 supports the vibration table 3 by hydraulic pressure, and the bearings 5 are connected to each other by an oil communication pipe 6 through which oil flows. Each bearing part 5 is arranged between each frame 2 and the vibration table 3, and is fixed to each frame 2 by bolts or the like.
[0019]
As shown in FIG. 3, each of the frames 2 arranged opposite to the vibrating direction of one of the vibrating devices 4 in the vibrating table 3, that is, two frames corresponding to the front and rear surfaces of the vibrating table 3. Numeral 2 is connected by a front-rear connection member 2a that extends through the insertion groove 3a formed in the vibration table 3 and extends in the left-right direction (Y-axis direction). Further, the two frame bodies 2 corresponding to the left and right surfaces of the shaking table 3 are also connected by a front and rear connecting member 2a that extends through the insertion groove formed in the shaking table 3 and extends in the front and rear direction (X-axis direction). The frame 2 corresponding to the lower surface of the vibrating table 3 and the upper surface of the vibrating table 3 are connected by an upper / lower connecting member that extends through the insertion groove formed in the vibrating table 3 and extends in the vertical direction (Z-axis direction).
[0020]
Here, the two frames 2 connected by the front-rear connection member 2a vibrate integrally with the vibration table 3 when the vibration table 3 vibrates in the front-rear direction. When the shaking table 3 vibrates in the left-right direction or the up-down direction, the bearings 5 provided on the frame 2 and the shaking table 3 slip, and the frame 2 does not vibrate. ing. That is, each bearing portion 5 of each frame 2 connected by the front-rear connection member 2a supports the vibration table 3 by restricting the movement of the vibration table 3 in one of the vibration devices 4 in the vibration direction (front-back direction). In addition, the vibration table 3 is configured to be allowed to move in the vibration direction (front-back direction) by the other vibration apparatus. The insertion groove 3a is formed so that the front and rear connecting member 2a and the vibration table 3 do not interfere with each other when the vibration table 3 vibrates in the vertical and horizontal directions.
[0021]
Similarly, when each of the frames 2 connected by the left and right connecting members and each of the frames 2 connected by the upper and lower connecting members vibrate in the horizontal direction or the vertical direction, the vibration table 3 When the vibrating table 3 vibrates in the other direction, the bearings 5 and the vibrating table 3 slide. That is, when the frame body 2 is vibrated in a direction normal to the corresponding surface of the shaking table 3, the frame bodies 2 vibrate integrally with the shaking table 3, and are in a horizontal direction with respect to the corresponding surface of the shaking table 3. During the vibration, the movement of the vibration table 3 is allowed.
[0022]
Here, the configuration of each bearing unit 5 that supports the vibration table 3 in the direction normal to the support surface and allows movement in a direction parallel to the support surface will be described.
[0023]
Each bearing portion 5 has a hydrostatic bearing 8 that comes into contact with the support surface of the shaking table 3 and into which oil flows, and a connecting pipe 9 that supplies oil into the hydrostatic bearing 8 and extends toward the frame 2. ing. The hydrostatic bearing 8 pressurizes the oil pressurized inside, and supports the vibration table 3 with an oil film.
[0024]
In the present embodiment, each of the bearings 5 provided on one of the frame bodies 2 facing each other has a spring 10 through which the connecting pipe 9 is inserted. The spring 10 expands and contracts in the vibration direction (front-rear direction) of the one vibration means 4, and the hydrostatic bearing 8 contacts the seat 11 and the frame 2 contacts the piston 12. Further, the sitting part 11 is fixed to the hydrostatic bearing 8. That is, in the present embodiment, the urging means has a spring 10, which urges the hydrostatic bearing 8, which is a support portion of the bearing 5, to the vibration table 3 via the seat 11. I do. Further, the piston portion 12 is configured to be movable in the longitudinal direction of the connecting pipe 9 in the frame 2. In the present embodiment, each of the bearings 5 provided on the other frame 2 is not provided with the spring 10, the seat 11, the piston 12, and the like.
[0025]
Further, as shown in FIG. 3, the piston portion 12 comes into contact with the tip of a bolt 13 screwed with the frame 2. That is, when the bolt 13 is tightened in a direction approaching the shaking table 3, the piston 12 moves in the direction of the shaking table 3, and the spring 10 is pressed by the piston 12 in the direction of the shaking table 3. That is, the spring 10 is elastically deformed to be compressed, and the biasing force applied to the hydrostatic bearing 8 is increased by the contraction of the spring 10. Conversely, when the bolt 13 is loosened in a direction away from the vibration table 3, the spring 10 expands, and the urging force applied to the hydrostatic bearing 8 decreases. Thereby, adjustment of the hydraulic pressure, oil film, etc. of the hydrostatic bearing 8 can be performed. That is, in the present embodiment, the urging force adjusting means has the bolt 13, and the amount of extension of the spring 10 is adjusted by the amount of tightening of the bolt 13. In the present embodiment, the bolts 13 are also provided on one of the frames 2 and are not provided on the other frame 2.
[0026]
The aforementioned oil communication pipe 6 is connected to the connection pipe 9 of each bearing portion 5. In the present embodiment, the oil communication pipes 6 are arranged in each frame 2 and each connecting member, and are configured so that the hydraulic pressure in each hydrostatic bearing 8 becomes substantially equal.
[0027]
In the multi-axis vibration testing machine 1 configured as described above, when each of the vibrating devices 4 is operated, the vibrating table 3 is vibrated in two axial directions of the front-rear direction and the vertical direction. At this time, each bearing part 5 regulates the movement of the installed frame body 2 in the normal direction, and allows the movement in the other two directions. As a result, the vibrating table 3 vibrates in the front-rear direction (X direction) substantially parallel to the input of one vibrating device 4 and substantially vertically (Z direction) to the input of the other vibrating device 4. Direction). That is, the shaking table 3 is not restrained in the input direction of each of the vibrating devices 4, and no large couple (moment) is generated in each part of the shaking table 3.
[0028]
Here, when the vibrating table 3 is vibrated by each of the vibrating devices 4, the oil of the hydrostatic bearings 8 of each of the bearings 5 is in communication with the oil communication pipe 6. Etc. become substantially equal. Thereby, the vibration table 3 is automatically aligned with respect to each frame 2. That is, for example, the hydraulic pressure in each bearing unit 5 becomes uneven, and the posture of the shaking table 3 does not tilt with respect to the excitation axis, and the rigidity of each bearing unit 5 does not become unbalanced. The vibration table 3 can be vibrated stably. The hydraulic pressure, oil film, and the like applied to these bearing portions 5 are adjusted by the degree of tightening of the bolts 13.
[0029]
As described above, according to the multiaxial vibration testing machine 1 of the present embodiment, the supporting force is applied to the vibrating table 3 by the spring 10, and the urging force of the spring 10 is adjusted by the tightening amount of the bolt 13. Therefore, it is possible to adjust the initial support force and the like of each bearing portion 5. That is, unlike the related art, there is no need to provide a preload bolt for inserting the vibrating table to connect the opposing frame members and tightening the frame members to provide the initial support force.
[0030]
Accordingly, since there is no long member such as the preload bolt in the shaking table 3, resonance of the long member does not occur, and the upper limit of the vibration frequency of the shaking table 3 can be increased.
[0031]
In addition, since there is no long member, the reliability and durability of the device can be improved.
[0032]
Further, the bearings 5 provided on the same frame 2 can be provided separately, so that the allowable moment can be increased. In other words, it is possible to reduce the size of the shaking table 3 while securing the allowable moment of the apparatus, or to increase the allowable moment with the shaking table 3 of the same size as the conventional one, thereby dramatically increasing the degree of freedom in designing the apparatus. Can be improved.
[0033]
Further, according to the multiaxial vibration testing machine 1 of the present embodiment, since the front and rear connecting members 2a of the vibration table 3 are provided integrally with the frame 2, relatively high rigidity is given to each of the opposed frames 2. In addition, the vibration of the vibration device 4 can be accurately transmitted to the vibration table 3. That is, for example, the rigidity is improved as compared with the case where the frames are connected to each other by the above-described preload bolts, and the preload bolts are not damaged by excessive stress or the like acting on the preload bolts. .
[0034]
In addition, according to the multiaxial vibration tester 1 of the present embodiment, since the oil communication pipe 6 is disposed inside the front and rear connection member 2a, it is possible to linearly communicate between the bearing portions 5 and to perform oil communication. The path of the tube 6 can be shortened, and the manufacturing cost can be reduced. Further, the oil communication pipe 6 can be properly protected by each frame 2 and the front and rear connection member 2a. Furthermore, since the oil communication pipe 6 is formed in a straight line, reliability and durability are remarkably improved as compared with a pipe having a curved section.
[0035]
Further, according to the multiaxial vibration tester 1 of the present embodiment, the spring 5 that expands and contracts in the vibration direction is disposed on the bearing portion 5, and the hydrostatic bearing 8 is urged toward the vibrating table 3 to thereby increase the hydrostatic bearing. Since the initial support force is applied to the bearing portion 5 by increasing the hydraulic pressure of 8, the initial support force can be applied to the bearing portion 5 with a simple configuration, which is advantageous in terms of manufacturing costs and the like.
[0036]
Further, according to the multiaxial vibration testing machine 1 of the present embodiment, by adjusting the tightening amount of the bolt 13, the extension amount of the spring 10 is adjusted, and the biasing force applied to the hydrostatic bearing 8 from the spring 10 is adjusted. As a result, the initial support force can be adjusted with a simple configuration, which is advantageous in terms of manufacturing cost and the like.
[0037]
In the above-described embodiment, the multi-axis vibration tester 1 that vibrates in the front-rear direction and the up-down direction has been described. The good thing is, of course.
[0038]
In the above-described embodiment, the static pressure bearing 8 is urged by the spring 10, but it may be urged by an elastic body such as rubber.
[0039]
Further, in the above-described embodiment, the one in which the urging force of the spring 10 is directly adjusted by the bolt 13 has been described. However, the one in which the urging force is adjusted by the operation of another mechanical element may be used, or the magnetic force or the like may be used. May be used to adjust the urging force indirectly, and it goes without saying that specific detailed structures and the like can be appropriately changed.
[0040]
【The invention's effect】
As described in detail above, according to the first aspect of the invention, it is possible to adjust the initial supporting force of each bearing portion. It is not necessary to provide a preload bolt for connecting the frames and tightening the frames to provide an initial supporting force.
Therefore, since there is no long member such as the preload bolt on the shaking table, resonance due to the long member does not occur, and the upper limit of the vibration frequency of the shaking table 3 can be increased. Further, the bearing portions provided on the same frame can be provided separately, and the allowable moment can be increased. In other words, it is possible to reduce the size of the shaking table while maintaining the allowable moment of the device, or to increase the allowable moment with a shaking table of the same size as before, dramatically improving the degree of freedom in device design. can do.
[0041]
According to the second aspect of the present invention, in addition to the effect of the first aspect, the vibrating table is automatically aligned with respect to each frame body. As a result, the shaking table can be vibrated stably without the posture of the shaking table being inclined with respect to the vibration axis or the rigidity of each bearing part being unbalanced.
In addition, the oil communication pipe of each bearing is arranged inside the connecting member, so that the oil communication pipe is connected linearly between the bearings, shortening the path of the oil communication pipe and reducing the manufacturing cost. can do. Further, the oil communication pipe can be properly protected by each frame and the connecting member. Furthermore, since the oil communication pipe is formed in a straight line, reliability and durability are remarkably improved as compared with a pipe having a curved section.
Furthermore, since the connecting member of the shaking table is provided integrally with the frame body, relatively high rigidity is given to each of the opposing frame bodies, and the vibration of the vibrating device can be accurately transmitted to the shaking table. That is, for example, the rigidity is improved as compared with the case where the frames are connected to each other by the above-described preload bolts, and the preload bolts are not damaged by excessive stress or the like acting on the preload bolts. .
[0042]
According to the third aspect of the present invention, in addition to the effect of the second aspect, a spring member that expands and contracts in the vibration direction is arranged in the bearing portion, and the hydrostatic bearing is urged to the vibrating table, so that the hydrostatic bearing is improved. Since the initial support force is applied to the bearing portion by increasing the hydraulic pressure, the initial support force can be applied to the bearing portion with a simple configuration, which is advantageous in terms of manufacturing cost and the like.
[0043]
According to the fourth aspect of the present invention, in addition to the effect of the third aspect, by adjusting the bolt tightening amount, the amount of extension of the spring material is adjusted, and the biasing force applied to the hydrostatic bearing from the spring material is adjusted. As a result, the initial support force can be adjusted with a simple configuration, which is further advantageous in terms of manufacturing cost and the like.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the appearance of a multi-axis vibration testing machine according to an embodiment of the present invention.
FIG. 2 is an external perspective view of a vibration table and a frame.
FIG. 3 is a partial side sectional view of a vibration table and a frame.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multi-axis vibration test machine 2 Frame 2a Front-back connection member 3 Vibration table 4 Vibration device 5 Bearing part 6 Oil communication pipe 8 Static pressure bearing 10 Spring 13 Bolt

Claims (4)

A shaking table on which the sample body is placed;
A plurality of vibration means for linearly vibrating the vibration table in different directions,
A frame supporting the vibration table via a plurality of bearings,
Each of the bearings is installed in correspondence with each of the vibrating means, regulates movement of the vibrating table in the vibrating direction by one vibrating means, supports the vibrating table, and supports the other vibrating table. In a multi-axis vibration testing machine configured to allow the shaking table to move in the vibration direction by the vibration means,
At least one of the bearing units includes an urging unit that urges a supporting portion of each bearing unit toward the vibration table, and an urging force adjusting unit that adjusts an urging force of the urging unit. Characteristic multi-axis vibration testing machine. Each of the bearing units has a hydrostatic bearing that supports the vibration table by hydraulic pressure,
The frame is disposed facing the outside of at least one vibration direction in the vibration table,
A connecting member for connecting the frame bodies arranged to face each other,
An oil communication pipe arranged in the connecting member and connected to the hydrostatic bearings of each of the bearing portions of the frame body opposed to each other, and through which oil flows. 2. The multiaxial vibration tester according to 1. The biasing unit may include a spring member that expands and contracts in a vibration direction of the corresponding vibration unit with the bearing unit provided with the biasing unit, and biases the hydrostatic bearing toward the vibration table. The multi-axis vibration testing machine according to claim 2, wherein: The multi-axial vibration testing machine according to claim 3, wherein the urging force adjusting means includes a bolt that is screwed with the frame body and adjusts the amount of extension of the spring member by a tightening amount.

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