JP3152411B2 - Multi-degree-of-freedom vibration testing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-degree-of-freedom vibration tester which can be used for vibration tests of various structures.

[0002]

2. Description of the Related Art Recently, vibration experiments have become very important for the evaluation of earthquake resistance and safety of large structures such as nuclear power generation facilities and the like. There is a demand for a multi-degree-of-freedom vibration tester capable of applying a degree of freedom.

[0003] On the other hand, since these specimens are large,
In many cases, a scale model is used for testing, and when a seismic test is performed using a scale model, vibration must be applied at a frequency higher than the actual vibration frequency of the earthquake in proportion to the scale ratio. For example, the upper limit frequency of an earthquake is about 10 Hz, but if the scale is 1/10, it is necessary to apply vibration up to 100 Hz. Testing machines are needed.

Conventionally, there are various types of multi-degree-of-freedom vibration testing machines. For example, although not shown as a vibrating means, an electric vibration generator is used to influence the vibration in one direction to the vibration in the other direction. There has been an invention described in Japanese Patent Publication No. Sho 49-7171 (hereinafter referred to as a first conventional example) having a guide frame and a guide frame guide means so as not to provide the guide frame.

As another example, there is the invention of Japanese Patent Publication No. 54-44461 (hereinafter referred to as a second conventional example) shown in FIGS. 7 and 8, in which a vibration table 501 is replaced with a vibration table using a hydrostatic bearing. In order to support the device so that it can vibrate only in one plane by the guide device 502 and to vibrate in various directions with multiple degrees of freedom,
In the X direction, a plurality of synchronously connected hydraulic cylinders for excitation 503 are allowed to move in a direction perpendicular to the excitation direction of the hydraulic cylinders for excitation, and Couplings 506, 5 with hydrostatic bearings for transmitting vibration
According to 06, vibration can be obtained by connecting to the corresponding portion of the vibration table 501. The same applies to the Y direction, but details are omitted.

Further, as another example, as shown in FIGS.
Japanese Patent Publication No. 3-81093, filed by the present applicant
9 and 10).
Is a multi-degree-of-freedom vibration testing machine in the X and Y directions, wherein a horizontally-formed rectangular parallelepiped vibration table 1 and, for example, a vibration testing machine in the X direction, the X direction of the vibration table 1 The first vibration shaft 2 that slidably vibrates only in the X direction on one side wall surface 1-1
-1 and another side wall surface 1-11 of the shaking table in the X direction.
A first hydraulic guide device 14-1 is provided on the vibration table, and the Y direction is also configured in the same manner. As shown in FIG. 11, in the Z direction, a third vibration is applied to the lower center of the vibrating table in the Z direction. It is provided with a swing shaft 2-3.

[0007]

In the first conventional example, since the guide frame and the guide frame guide means are required, there is a drawback that the entire configuration of the multi-degree-of-freedom vibration testing machine is complicated and large.

In the second prior art example, since the structure of the coupler is a U-shaped fork bracket, one more vibration system is added due to the coupler, so that not only the frequency characteristic drops in a high frequency range but also the axial direction. Since the guide is also used as a vibration cylinder, there are drawbacks in that the dimensions and the like can be restricted and the structure is not very robust.

The third conventional example is optimal for a large-sized test object, but has a drawback that the whole structure is complicated and large for a small-sized test object.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the conventional drawbacks and to propose a multi-degree-of-freedom vibration testing machine which has a simplified overall structure and is optimal for vibration testing of various test objects.

[0011]

In order to solve the above-mentioned problems, the present invention is characterized in that, in claim 1, "a rectangular parallelepiped-shaped vibrating table provided horizontally and two sets of X-direction modules provided on one side wall of the vibrating table are provided. Vibrating means, two sets of Y-direction vibrating means provided on the side wall adjacent to the one side, and four sets of Z-direction vibrating means and supporting means provided at the lower part of the vibrating table, wherein the X and The Y-direction vibrating means has a connecting portion having a hydrostatic bearing connected to the side wall of the shaking table at one end, a hydraulic guide having a hydrostatic bearing in the middle, and an electrodynamic vibration generator at the other end. And formed
The direction in which the axes of the two sets of parallel vibration means in the X and Y directions are at right angles to the respective side walls, and at right angles to the side walls, are the straight lines formed by crossing the center of gravity of the vibrating table (referred to as gravity lines). And the axes of the two sets of parallel vibrating means sandwich the center-of-gravity line, and have the same distance from the center-of-gravity line, and the Z-direction vibrating means is A connecting portion having a hydrostatic bearing connected at a predetermined portion on the lower surface of the shaking table, a hydraulic guide having a hydrostatic bearing in the middle, and an electrodynamic vibration generator having an air spring mechanism in a lower portion, , the axis of the four pairs of Z-direction actuating mechanism is, each said parallel to the vertical line crosses the shaking table of the center of gravity, and, a vertical line and makes <br/> spacing is provided at a predetermined interval of the same size And supporting means for supporting the vibration table and the Z-direction vibrating means. Multi-degree of freedom vibration testing machine. "
Was configured.

According to a second aspect of the present invention, "a horizontally-formed rectangular parallelepiped vibration table having a side of 25 to 100 cm and a predetermined portion of one side wall surface in the X and Y directions of the vibration table are connected. A set of X and Y vibrating means having an electro-dynamic vibration generator, and an electro-dynamic vibration generator provided with an air spring mechanism formed on the floor surface connected to a predetermined portion of the lower portion of the shaking table A coupling unit having a pair of Z-direction vibrating means having a machine, wherein each of the X and Y-direction vibrating means has a hydrostatic bearing connected to a side wall of the vibrating table at one end; A hydraulic guide having a hydrostatic bearing in the middle and an electrodynamic vibration generator at the other end are formed, and the axes of the vibration means in the X and Y directions are perpendicular to the respective side walls, and , The axis of the Z-direction vibrating means is located on a straight line formed by crossing the center of gravity of the shaking table. Multi-degree-of-freedom vibration test machine, characterized in that it is configured to be on the vertical line crosses. "Configured to.

[0013]

As described above, according to the first aspect of the present invention, the vibration table having a rectangular parallelepiped shape provided horizontally and the side wall on one side of the vibration table are provided.
Two sets of X-direction vibrating means, two provided on the side wall adjacent to the one side
Sets of Y-direction vibrating means, and four sets of
Since it is constituted by the Z-direction vibrating means and the supporting means for supporting the gravity of the vibrating table, a multi-degree-of-freedom vibration testing machine whose overall configuration is simplified and which is easy to handle can be obtained. A rectangular parallelepiped vibration table having one side length of 25 to 100 cm, and vibration means provided on the axis of the center of gravity of the side walls in the X and Y directions of the vibration table, and on the lower surface of the vibration table Since the Z-direction vibration means and air spring mechanism are provided together, a simplified multi-DOF vibration tester that is easy to handle and convenient can be obtained, and a multi-DOF vibration test machine suitable for small-sized test objects can be obtained. It is done.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention and a reference example will be described with reference to the drawings. FIG. 1 is a plan view of a reference example, and FIG. 2 is a side view of the reference example. 1 is a rectangular parallelepiped shaking table, 1-1 is the X direction of the shaking table
The side wall surface, 1-2 is the one side wall surface of the shaking table in the Y direction, and 1-5 is the lower surface of the shaking table. 2 is a vibration means (the symbol is omitted in the figure) , 2-1 is X
Direction excitation axis, 2-2 is Y direction excitation axis, 2-3 is Z direction excitation axis,
3-1 is an electrodynamic vibration generator in the X direction, 3-2 is an electrodynamic vibration generator in the Y direction, 3-3 is an electrodynamic vibration generator in the Z direction, 4-1 is X
4-2, bearing connection in Y direction, 4-2
3 is the bearing connection in the Z direction, 6-1 is the hydraulic guide in the X direction, 6
−2 is a hydraulic guide in the Y direction, 6−3 is a hydraulic guide in the Z direction, 7
-1 is a vibration table in the X direction, 7-2 is a vibration table in the Y direction, 7-3 is a vibration table in the Z direction, and 12 is a hydrostatic bearing.

As shown in FIGS. 1 and 2, a reference example is an electrodynamic type vibrating table 1 which is connected to a horizontally shaped rectangular parallelepiped vibrating table 1 and one side wall surface 1-1 of the vibrating table 1 in the X direction. A plurality of sets of vibration means 2 having a vibration generator 3-1;
-2, a plurality of sets of vibrating means 2 having an electro-kinetic vibration generator 3-2 connected to the vibrating table 1 and supporting means for supporting the gravity of the vibrating table 1, wherein the vibrating means 2 is, for example, In the X direction, a vibration shaft 2-
1 is connected to a bearing connecting portion 4-1 provided with a hydrostatic bearing at one end, and has a hydraulic guide 6-1 composed of a hydrostatic bearing around an intermediate portion of the vibrating shaft 2-1. The vibration table 7-1 of the electrodynamic vibration generator 3-1 is fixed to the other end of the shaft to constitute a plurality of sets of vibration means 2 formed on the floor surface 9-1. The vibrating means 2 has the same configuration, and only the reference numeral is attached, and the description is omitted. Note that the predetermined connection portion with the vibration table 1 is such that a plurality of sets of vibration means are arranged in parallel with each other, and at the same interval as a straight line in the vibration direction crossing the center of gravity of the vibration table 1. Such a connection site. The supporting means for supporting the gravity of the shaking table 1 is provided with a static pressure between the lower surface 1-5 of the shaking table 1 and the floor surface 9-1 so as to vibrate independently in the X and Y directions in a horizontal plane. The multi-degree-of-freedom vibration tester according to the reference example is configured by providing bearings. Is activated to perform a test.

[0016] Figure 3 is a plan view of the first embodiment, FIG. 4 is a side view of the first embodiment. In the figure, 1-5 is the lower surface of the shaking table 1, 2-3 is the vibration axis in the Z direction, 3 is the electrodynamic vibration generator in the Z direction, 4 is the vibration means in the Z direction, 4-3. Is a bearing connecting portion in the Z direction, 6-3 is a hydraulic guide in the Z direction, 7-3
Is a vibration table in the Z direction, 9-3 is a base, 18 is an air pump mechanism, and the other symbols are the same as those described above, and the description is omitted.

In the first embodiment, the vibration table 1 in the X and Y directions is provided on the vibration table 1 having a rectangular parallelepiped shape formed horizontally as in the reference example, and the vibration means 4 in the Z direction is provided. X,
This constitutes a multi-degree-of-freedom vibration testing machine in the Y and Z directions. Therefore, the description of the vibration means in the X and Y directions of the first embodiment is omitted, and the vibration means 4 in the Z direction will be described.
The vibrating means 4 is provided with a predetermined number of plural sets at predetermined positions on the lower surface 1-5 of the vibration table 1. The shaking table 1
The predetermined portion of the lower surface 1-5 is a portion which is symmetrical in the direction perpendicular to the straight line passing through the center of gravity of the vibration table 1 in the vibration direction in the Z direction and has the same interval. FIG. 3 shows four sets of the shaking table 1 by dotted lines, but the present invention is not limited thereto.
Since a plurality of sets of the vibrating means 4 are similarly configured, only one set of the vibrating means 4 will be described. The vibrating means 4 is connected to a predetermined portion of the lower surface 1-5 of the vibrating table 1 and a bearing connecting portion 4 provided with a hydrostatic bearing at one end of the vibrating shaft 2-3 at the connecting portion.
And a hydraulic guide # 6-3 comprising a hydrostatic bearing is provided around an intermediate portion of the vibrating shaft 2-3, and an electrodynamic vibration generator 3 is provided at the other end of the vibrating shaft 2-3. The excitation table 7-3 is fixed, and an air pan mechanism 18 is provided below the excitation table 7-3.
Is provided. The multi-degree-of-freedom vibration tester having the above-described configuration can execute the vibration test by activating the vibration means in each direction.

[0018] Figure 5 is a plan view of a second embodiment, FIG. 6 is a side view of a second embodiment. The second embodiment is a multi-degree-of-freedom vibration testing machine in which the size of the shaking table 1 is 25 cm to 100 cm on one side, and the vibration means in the X, Y and Z directions is configured as one set. The configuration is obvious from the description of the reference example and the first embodiment, and the description is omitted. The multi-degree-of-freedom vibration testing machine of the second embodiment is particularly suitable for testing small-sized test objects.

[0019]

As described in detail above, the invention of claim 1 is characterized in that a horizontally shaped rectangular parallelepiped vibration table and a predetermined X- and Y-direction of one side wall surface of one side of the vibration table are provided. Two sets of vibrating means each having an electro-dynamic vibration generator are connected to the part, and the vibrating table vibrates independently in each direction between the lower surface of the vibrating table and the floor surface. Since the vibration tester is provided with a set of vibration means, the overall configuration is simplified and a multi-degree-of-freedom vibration tester which is convenient for handling is obtained.The installation area of the vibration tester can be reduced and the cost can be reduced. It has the effect of being peeled off. In addition, the invention of claim 2 has a side of 25 to 100 cm.
And a set of vibrating means provided at a predetermined position in the Z direction as in the X and Y directions, so that the overall structure is simplified and the X, Y and Z directions are compact and easy to handle. There is an effect that a vibration tester with a degree of freedom can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a reference example of the present invention.

FIG. 2 is a side view of a reference example of the present invention.

FIG. 3 is a plan view of the first embodiment of the present invention.

FIG. 4 is a side view of the first embodiment of the present invention.

FIG. 5 is a plan view of a second embodiment of the present invention.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a plan view of a second conventional example (X and Y directions).

FIG. 8 is a side view of the second conventional example.

FIG. 9 is a side view of a third conventional example (X and Y directions).

FIG. 10 is a side view of a third conventional example (X and Y directions).

FIG. 11 is a side view of a third conventional example (X and Z directions).

[Explanation of symbols]

 1 Shaking table 1-1 X direction 1 side wall surface 1-2 Y direction 1 side wall surface 1-5 Lower surface 2 Exciting means 2-1 X direction excitation shaft 2-2 Y direction excitation shaft 2-3 Z direction excitation Shaft 3-1 X direction electrodynamic vibration generator 3-2 Y direction electrodynamic vibration generator 3-3 Z direction electrodynamic vibration generator 4-1 X direction bearing connection 4-2 Y direction bearing Connection part 4-3 Z direction bearing part connection part 6-1 X direction hydraulic guide 6-2 Y direction hydraulic guide 6-3 Z direction hydraulic guide 7-1 X direction vibration table 7-2 Y direction vibration table 7- 3 Z-direction excitation table 9-1 Floor surface 9-3 Base 12 Static shaft pressure receiver 18 Air spring mechanism 501 Shaking table 502 Shaking table guide device 503 Exciting hydraulic cylinder 505 Exciting hydraulic cylinder 506 Coupler 507 Coupler

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-98328 (JP, A) JP-A-54-104866 (JP, A) JP-A-60-173047 (JP, U) 81093 (JP, B2) JP-B 54-44461 (JP, B2)

Claims (2)

(57) [Claims] 1. A vibrating table having a rectangular parallelepiped shape provided horizontally, two sets of X-direction vibrating means provided on one side wall of the vibrating table, and two sets of Y means provided on a side wall adjacent to the one side. Direction vibrating means, four sets of Z-direction vibrating means and support means provided at the lower part of the vibrating table, and the X and Y-directional vibrating means are provided at one end on a side wall of the vibrating table. A coupling portion having a static pressure extractor to be coupled, a hydraulic guide having a static pressure bearing in the middle, and an electrokinetic vibration generator at the other end are formed, and two sets of the X and Y directions are arranged in parallel. The axis of the vibrating means is perpendicular to the respective side walls, and is an axis parallel to the direction formed by a straight line (referred to as the center of gravity line) formed at right angles to the side walls and crossing the center of gravity of the vibrating table. The two sets of parallel vibration means are configured so that the axes thereof have the same dimension with respect to the center of gravity line with respect to the center line, and The means is formed of a connecting portion having a hydrostatic bearing connected at a predetermined portion on the lower surface of the shaking table, a hydraulic guide having a hydrostatic bearing in the middle, and an electrodynamic vibration generator having an air spring mechanism in a lower portion. And said 4
The axis of the set of Z-direction vibration means, in parallel to the vertical line that crosses respectively the vibration table of the center of gravity, and, together with the spacing formed by the vertical line is provided at a predetermined interval in the same size, and the vibration table
A multi-degree-of-freedom vibration testing machine, comprising: a bearing means for supporting a Z-direction vibrating means. 2. A vibrating table having a rectangular parallelepiped shape having one side of 25 to 100 cm formed horizontally, and an electrodynamic vibration generating isolator connected to a predetermined portion of one side wall surface in the X and Y directions of the vibrating table. A set of X with
And a Y-direction vibrating means, and a set of Z-directional vibrating means having an electrodynamic vibration generator provided with an air spring mechanism formed on the floor surface connected to a predetermined portion below the vibrating table. Each of the vibrating means in the X and Y directions includes a connecting portion having a hydrostatic bearing connected to a side wall of the shaking table at one end, a hydraulic guide having a hydrostatic bearing in the middle, It is formed with an electro-kinetic vibration generating rocker at the end, and the axis of the vibration means in the X and Y directions is formed at right angles to the respective side walls and across the center of gravity of the vibration table. A multi-degree-of-freedom vibration testing machine characterized in that it is configured to be on a straight line , and that the axis of the Z-direction vibrating means is on a vertical line passing through the center of gravity of the shaking table.