JP3290783B2 - 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 vibration tester for applying vibration in three-dimensional or two-dimensional directions.

[0002]

2. Description of the Related Art As a conventional vibration testing machine, there is a two-dimensional vibration testing machine as shown in FIG.
No. 7). To explain the outline of the structure of this testing machine, a starting material 2 is provided on the upper surface of a base 1 and a starting material 2 is provided.
Brackets 3 are provided at four places on the right side of the bracket 3, the first vibrator 4 is fixed inside the bracket 3, and the link joint 6 is fixed to the rod 5 of the first vibrator 4.

[0003] A shaft 8 provided at one end of the first link 7 is inserted into the bracket 3, and an upright portion 9 is provided at the other end of the first link 7 to protrude upward. The shaft 10 provided in the link joint 6 is inserted into the hole provided in the. A bracket 12 is provided on a lower surface of a table 11 disposed above the base 1, and a shaft 14 provided at an upper end of a second link 13 is inserted into the bracket 12, and a bracket 14 is provided at a lower end of the second link 13. The provided shaft 15 is
The first link 7 is inserted into a hole provided at the center of the first link 7.

[0004] A second vibrator 16 is fixed to the starting material 2,
A shaft 19 provided at one end of the joint 18 is inserted into a hole provided at the tip of the rod 17 of the second vibrator 16, and a shaft 20 provided at the other end of the joint 18 is connected to the lower surface of the table 11. Is inserted into the bracket 21 provided in the bracket. And
When the first exciter 4 is operated and the rod 5 vibrates, the first link 7 swings via the upright portion 9 connected to the shaft 10 of the link joint 6, and the second link 13 having the shaft 15 is moved. The table 11 vibrates up and down, and the table 11 vibrates up and down via the shaft 14 of the second link 13.

When the rod 19 vibrates by operating the second vibrator 16, the joint 18 having the shaft 19 vibrates in the horizontal direction, and the table 11 vibrates in the same direction via the shaft 20 of the joint 18. The second link 13 swings about the shaft 15. Assuming that the vibration direction of the second vibrator 16 is the X direction and the vibration direction of the first vibrator 4 is the Z direction, the vibration tester vibrates in the X direction and the Z direction.

In order to vibrate three-dimensionally, a test machine as shown in FIG. 8 is required. This vibration tester is based on the base 22
Three spherical bearings 2 on the upper surface of the
4 (FIG. 8 shows the spherical bearing 2 on the base 22).
(Only 4 is shown.) The spherical portions provided at both ends of the three first vibrators 25 are respectively supported by the spherical bearings 24 and constitute a Z-direction vibrating portion.

A bearing 27 is fixed to the upper surface of an X-direction support base 26 attached to the upper surface of the base 22, and a shaft extending through the lower end of an X-direction bell crank 28 formed in a triangular box shape is used as the bearing 27. Insert A spherical bearing 29 is provided on the X-direction bell crank 28 and the vibrating table 23, and spherical portions formed at both ends of the vibrating rod 30 parallel to the arrow X are supported by the spherical bearing 29. Bearings 31 are provided at an intermediate portion of the X-direction bell crank 28 and the base 22, and shafts provided at both ends of the X-direction vibrator 32 are inserted into the bearings 31 to form an X-direction vibrating portion.

A bearing 34 is fixed to the upper surface of two Y-direction support bases 33 attached to the upper surface of the base 22, and a shaft extending through the lower end of the Y-direction bell crank 35 is inserted into the bearing 34. Spherical portions formed at both ends of a vibrating rod 37 parallel to the arrow Y are supported by a directional bell crank 35 and a spherical bearing 36 provided on the vibration table 23. Y-direction bell crank 3
Both ends of the Y-direction vibrator 38 are pivotally mounted on bearings provided on the intermediate portion 5 and the base 22.

The vibrating table 23 of this vibration tester is held horizontally by three first vibrators 25, and when the rods of the three first vibrators 25 vibrate at the same frequency and the same amplitude,
The vibrating table 23 vibrates in the Z direction (vertical direction) while maintaining the horizontal position.
, And the vibrating rod 37 swings about the spherical bearing 36.

When the rod of the X-direction vibrator 32 vibrates,
The vibrating table 23 vibrates in the X direction, and accordingly, the vibrating rod 37 swings about the spherical bearing 36, and the first vibrator 25 swings about the spherical bearing 24. Since the three first vibrators 25 have the same distance between the spherical portions at both ends, the vibrating table 23 vibrates in the X direction while being held horizontally. Similarly, when the rod of the Y-direction vibrator 38 vibrates, the vibrating table 23 vibrates in the Y direction while being held in a horizontal state, and the first vibrator 25 and the vibrating rod 30 swing.

[0011]

The vibration tester shown in FIGS. 7 and 8 has the following disadvantages. (1) The vibration tester shown in FIG. 7 can perform a two-dimensional vibration test, but cannot perform a three-dimensional vibration test even if a third vibrator is added. (2) The vibration tester shown in FIG.
Since the structure is transmitted to the table 11 via the first link 7 and the second link 13, the amplitude is reduced by the clearance between the hole of each link and the shaft, and the waveform of the vibration is distorted. There are drawbacks in which experiments cannot be performed, and drawbacks in which high-frequency vibration cannot be performed. This clearance is increased by wear of the holes and shafts of each link, and the performance of the vibration tester deteriorates over time.

(3) The vibration tester shown in FIG. 7 has a disadvantage that the cost of the vibration tester is high due to its complicated structure. Further, if the rigidity is increased in order to prevent the lateral vibration of each link, In addition, the inertial mass of the entire device increases, which is a factor that cannot be applied to high-frequency vibration. (4) The vibration tester shown in FIG. 8 uses at least three first vibrators 25 to hold the vibration table 23 horizontally.
Since point support is required, three expensive first shakers 25 must be installed.

(5) Also, as shown in FIG. 9, the position of the center of gravity G of the specimen 39 placed on the vibration table 23 is eccentric from the center of the support point of the first vibrator 25. In addition, the excessive weight is applied to the first vibrator 25 on the eccentric side, and the vibration table 23
May tilt, causing pitching (or rolling) motion. The present invention aims to solve such problems,
A single vibrator is used to apply vertical vibration. The vibrating table is held horizontally even if an eccentric load is applied to the vibrating table. In addition, the vibration waveform and amplitude are highly accurate, and the durability is inexpensive. It provides a simple vibration testing machine.

[0014]

In order to achieve the above object, a three-dimensional vibration tester according to the present invention has two pairs of bearings fixed to the upper surface of a horizontally installed base, and one pair of the above bearings is provided. Both ends of the large-diameter hollow shaft are supported on the bearing, and horizontal bell cranks are provided near both ends of the large-diameter hollow shaft so as to protrude substantially horizontally. A substantially central portion of the lower surface of the vibration table having a horizontal mounting surface is provided. And on the upper surface of the base opposed to the central portion, a spherical bearing for supporting spherical portions formed at both ends of the vertical shaker is provided, and at the four corners of the lower surface of the shaking table and each of the horizontal bell cranks, Spherical bearings for supporting spherical portions formed at both ends of a support rod parallel to the vertical exciter are provided to constitute a Z-direction (vertical direction) vibrating portion. One end of the X-direction bell crank is pivotally connected to the other end of the X-direction bell crank. The vibrating table is provided with spherical bearings for pivotally connecting spherical parts provided at both ends of a vibrating rod extending in the X direction (one direction in a horizontal plane), and an X part is provided on an intermediate part of the X-direction bell crank and the base. An X-direction oscillating portion is formed by pivotally connecting both ends of the directional shaker, one end of a Y-direction bell crank is pivotally mounted on the Y-direction support base provided on the base, and the other end of the Y-direction bell crank is The vibrating table is provided with a spherical bearing that pivotally connects spherical portions provided at both ends of a vibrating rod extending in the Y direction (a direction perpendicular to the X direction in a horizontal plane). Both ends of the Y-direction vibrator are pivotally connected to the base to form a Y-direction vibrating part, and vertical bell cranks are provided near both ends of the two large-diameter hollow shafts. Attach both ends of the connecting rod to the vertical bell crank to provide It is characterized in that the form.

Further, in the two-dimensional vibration testing machine of the present invention, two pairs of bearings are fixed to the upper surface of a horizontally installed base, and both ends of a large-diameter hollow shaft are supported by one pair of the bearings. A horizontal bell crank that protrudes substantially horizontally near both ends of the two large-diameter hollow shafts is provided on a substantially central portion of a lower surface of a vibration table having a horizontal mounting surface and an upper surface of the base opposed to the central portion. A spherical bearing for supporting a spherical portion formed at both ends of the vertical exciter, and at both corners of the lower surface of the shaking table and each of the horizontal bell cranks, both ends of a support rod parallel to the vertical exciter. A spherical bearing for supporting a spherical portion formed on the portion is provided to constitute a Z-direction (vertical direction) vibrating portion. One end of an X-direction bell crank is pivotally mounted on the X-direction support base provided on the base, X direction (one direction in the horizontal plane) on the other end of the directional bell crank and the shaking table Spherical bearings are provided to pivotally connect the spherical parts provided at both ends of the vibrating rod extending in the X direction, and both ends of the X direction vibrator are pivotally connected to the middle part of the X direction bell crank and the base in the X direction. A vibrating part is formed, and a vertical bell crank is provided near both ends of the large-diameter hollow shafts, and the opposite ends of the connecting rod are pivotally attached to the vertical bell cranks opposed to each other in the large-diameter hollow shafts, thereby causing an uneven load. An adjustment unit is configured. In any of the three-dimensional and two-dimensional vibration testing machines, the connecting rod is parallel to the vibration table.

[0016]

The operation of the two-dimensional vibration tester is the same as the operation of the three-dimensional vibration tester except for the Y-direction vibrating part, and the operation of the three-dimensional vibration tester will be described. When the specimen is placed on the shaking table of the three-dimensional vibration testing machine configured as described above, and the vertical shaker is operated, the shaking table becomes Z
The large-diameter hollow shaft reciprocates with the horizontal bell crank connected to the support rod. With the Z-direction vibration of the shaking table, the X-direction vibration rod and the Y-direction vibration rod swing around the spherical bearings of the X-direction bell crank and the Y-direction bell crank, respectively.

When the X-direction vibrator is operated, the vibrating table vibrates in the X-direction together with the X-direction vibrating rod, the vertical vibrator and the support rod swing about the lower end, and the Y-direction vibrator is vibrated. The swing rod swings about the spherical bearing of the Y-direction bell crank. When the Y-direction vibrator is operated, the vibrating table vibrates in the Y-direction together with the Y-direction vibrating rod, the vertical vibrator and the support rod swing about the lower end, and the X-directional vibrating rod is moved. It swings around the spherical bearing of the X-direction bell crank. When the upper and lower exciters, the X-direction exciter, and the Y-direction exciter are operated at the same time, the combined vibrations are generated.

When the center of gravity of the specimen on the shaking table is displaced in one of the X directions, an extra load is transmitted to the horizontal bell clamp via the support rod, and together with the horizontal bell clamp, a large diameter is applied. A pivoting torque is generated in the hollow shaft, and the vertical bell clamp of the large-diameter hollow shaft pulls the connecting rod.
On the other hand, the load on the support rod on the opposite side is reduced by the above-mentioned extra load and the connecting rod is similarly pulled, so that the rotation of the horizontal bell clamp receiving the extra load is prevented, and Will be retained.

When the center of gravity of the specimen on the shaking table is displaced in one of the Y directions, an extra load is transmitted to the horizontal bell crank at one end of the large-diameter hollow shaft via the support rod. The load on the support rod on the opposite side is reduced by the above-mentioned extra load, transmitted to the horizontal bell crank on the other end of the large-diameter hollow shaft via the support rod, and the torsional force is applied to the large-diameter hollow shaft. In addition, the large-diameter hollow shaft has a large section modulus and hardly twists. Therefore, the shaking table is held horizontally.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a three-dimensional vibration tester, FIG. 2 is a plan view of FIG. 1, and FIG. FIG. 4 is a perspective view of a three-dimensional vibration testing machine, and FIG. 4 is a perspective view of a large-diameter hollow shaft.
In the three-dimensional vibration testing machine, a rectangular base 40 and a short base 41 (see FIG. 2) which are used as they are in the two-dimensional vibration testing machine are installed on the floor of the pit P (see FIG. 2). 3)

The bases 40, 41 are installed horizontally, and a pair of bearings 42 arranged in a direction perpendicular to the paper surface of FIG. 1 are arranged at two places on the upper surface of the base 40, and are fixed by bolts or the like (FIG. 1). Shows only the front bearing 42 of the pair of bearings). Both ends of a large-diameter hollow shaft 43 are rotatably supported by the pair of bearings 42, and a horizontal bell crank 44 protruding in a substantially horizontal direction near both ends of the large-diameter hollow shaft 43.
Then, a vertical bell crank 45 projecting upward is provided (see FIG. 4).

A horizontal mounting surface 46a is provided above the base 40.
Is provided, a spherical bearing 47 is provided at the center of the lower surface of the vibration table 46, and the upper surface of the base 40 is
A spherical bearing 48 is provided at a position facing the spherical bearing 47. The vertical exciter 49 is a hydraulic cylinder, and a servo valve 50 for supplying and discharging pressure oil is provided on the outer surface.
9 and the end of the rod 49a.
7, 48 are provided with spherical surfaces which are supported (see FIG. 1).

Spherical bearings 51 are provided at four corners on the lower surface of the shaking table 46, and a spherical bearing 52 is provided on the horizontal bell crank 44 at a position facing the spherical bearing 51. At both ends of the support rod 53, spherical portions supported by the spherical bearings 51 and 52 are provided. The spacing between the two spherical portions of each support rod 53 is equal, the distance from the center of rotation of the horizontal bell crank 44 to the spherical bearing 52 is equal, and the support rods 53 are always kept parallel to each other.

With the above configuration, the vertical exciter 49
When the operation is performed, a Z-direction vibrating portion in which the vibration table 46 vibrates up and down is configured. A vertically long connecting rod 5 is attached to a vertical bell crank 45 facing each other in the two large-diameter hollow shafts 43.
4 are pivotally connected at both ends. The distance from the center of rotation to the vertical bell crank 45 to the pivot of the connecting rod 54 is equal, and the connecting rod 54 is always kept horizontal. The large-diameter hollow shaft 43, the vertical bell crank 45, and the connecting rod 5 described above.
Numeral 4 constitutes an unbalanced load adjusting unit for adjusting the unbalanced load of the specimen placed on the vibration table 46, as described later.

As shown in FIG. 1, an X-direction support table 55 is fixedly provided at the right end of the upper surface of the base 40.
A shaft 58 provided at the lower end of the X-direction bell crank 57 is rotatably inserted into a bearing 56 provided at the upper end of the X-axis bell crank 57. The X-direction bell crank 57 is formed in a triangular box shape, a spherical bearing 59 is provided at the upper end, and a spherical bearing 60 facing the spherical bearing 59 is provided at the right end of the vibrating table 46. The spherical portions provided at both ends of the vibrating rod 61 are inserted into 60. When the vibration table 46 does not vibrate in the Z direction, the vibration rod 61 is held in a horizontal state.

A bearing 62 provided in the middle of the X-direction bell crank 57 and a bearing 6 provided on the upper surface of the base 40
3, both ends of the X-direction vibrator 64 are pivotally connected. The X-direction vibrator 64 is a hydraulic cylinder, and a servo valve 65 for supplying and discharging pressure oil is provided on the outer surface (see FIG. 1). When the X-direction vibrator 64 is operated, the X-direction bell crank 57 swings around the shaft 58 as a fulcrum, and the X-direction vibrating portion is configured so that the vibration rod 61 vibrates in the X direction via the vibration table 46. You.

A two-dimensional vibration tester is constituted by the Z-direction vibrating section, X-direction vibrating section, and offset load adjusting section.
In a three-dimensional vibration tester, a Y-direction vibration part is further added. In the Y-direction vibrating section, a vibrating section having the same structure as the X-direction vibrating section is provided on the base 41. The reason why two sets of Y-direction vibrating parts are provided in FIG. 2 is to prevent the vibrating table 46 from rotating in a horizontal plane, and even if one set of Y-direction vibrating parts and one set of X-direction vibrating parts are provided. Good.

The Y-direction vibrating portion includes a Y-direction support 66 fixed on the upper surface of the base 41, a bearing 67 provided at the upper end of the Y-direction support 66, and a common shaft 68 penetrating the two bearings 67. A Y-direction bell crank 69 having a lower end pivotally connected to the common shaft 68, a spherical bearing 70 provided at an upper end of the Y-direction bell crank 69, and a spherical bearing 71 provided at an end of the shaking table 46; A vibrating rod 72 in which the spherical portions at both ends are inserted into the spherical bearings 70 and 71, and a Y-direction vibrator in which both ends are pivotally attached to the intermediate portion of the Y-direction bell crank 69 and the bearing provided on the upper surface of the base 41. It is constituted by a shaker 73 (see FIGS. 2 and 3).

Next, the operation of the three-dimensional vibration tester of the present invention will be described. (The operation of the two-dimensional vibration tester is the same as that of the vibration tester except for the Y-direction vibrating part. ,
Description is omitted). The specimen 39 is placed on the placement surface 46a of the vibration table 46, and the vibration table 46 vibrates in the X, Y, and Z directions.

Explaining the vibration in the Z direction, the operation of the vertical exciter 49 causes the four supporting rods 53 parallel to the vertical exciter 49 to vibrate in the Z direction together with the vibration table 46.
The horizontal bell crank 44 and the large-diameter hollow shaft 43 connected to the support rod 53 reciprocate. Since the vertical bell cranks 45 of the two large-diameter hollow shafts 43 are connected by the connecting rod 54, the reciprocating rotation amounts of the two large-diameter hollow shafts 43 are equal,
The mounting surface 46a of the vibration table 46 is held horizontally.

Since the end of the rod 49A of the vertical exciter 49 is directly connected to the lower surface of the vibration table 46, the vibration table 4
6 vibrates with an accurate vibration waveform and amplitude. Z of shaking table 46
With the directional vibration, the vibration rod 61 in the X direction swings around the spherical bearing 59, and the vibration rod 72 in the Y direction swings around the spherical bearing 70.

Explaining the vibration in the X direction, the operation of the X direction vibrator 64 causes the X direction bell crank 57 to swing about the shaft 58 as a fulcrum. Vibrates. At this time, the vertical exciter 49 and the four support rods 53 swing about the lower end, and the Y-direction exciting rod 72 swings about the spherical bearing 70 (see FIG. 5).

Explaining the vibration in the Y direction, the operation of the Y direction vibrator 73 causes the Y direction bell crank 69 to swing about the common shaft 68 as a fulcrum, and the Y direction vibration rod 72.
At the same time, the vibration table 46 vibrates in the Y direction. At this time, the vertical exciter 49 and the support rod 53 swing about the lower end, and the X-direction exciting rod 61 swings about the spherical bearing 59 of the X-direction bell crank 57. When the upper and lower exciters 49, the X-direction exciters 64, and the Y-direction exciters 73 are simultaneously operated, the vibrating table 46 performs a vibration obtained by combining the respective vibrations.

Specimen 39 on mounting surface 46a of shaking table 46
When the center of gravity G is substantially at the center of the vibration table 46 as shown in FIG. 5, a substantially uniform load is applied to the four support rods 53, and the mounting surface 46a is held horizontally. When the center of gravity G of the specimen 39 is displaced in the X direction, for example, FIG.
As shown in (2), when it is deviated to the left, an extra load is applied to the left support rod 53, and a load corresponding to the extra load is reduced to the right support rod 53.

The extra load of the left support rod 53 is transmitted to the left horizontal bell crank 44, and a counterclockwise torque is applied to the vertical bell crank 45 together with the left large-diameter hollow shaft 43 so that the connecting rod 54 is moved to the left. Tension. On the other hand, since the load corresponding to the extra load is reduced on the right support rod 53, the reduced load is applied to the connecting rod 54 via the right horizontal bell crank 44, the large-diameter hollow shaft 43, and the vertical bell crank 45. The right-handed pulling force is equal to the right-handed pulling force. Accordingly, the left support rod 53 is prevented from lowering, and the right support rod 53 is prevented from rising.
6a is held horizontally.

When the center of gravity G of the specimen 39 on the vibrating table 46 is displaced in one of the Y directions, an extra load is applied via the support rod 53 to the horizontal end of one end of the large-diameter hollow shaft 43. It is transmitted to the bell crank 44 and the support rod 5 on the opposite side
In 3, the excess load is reduced. Accordingly, a torsional force is applied to the large-diameter hollow shaft 43, but since the large-diameter hollow shaft 43 has a large sectional modulus, there is almost no twisting, and the vibration table 46 is held horizontally.

[0037]

Since the present invention is configured as described above, it has the following effects. (1) The two-dimensional vibration tester and the three-dimensional vibration tester of the present invention have the same structure with respect to the Z-direction vibration part and the X-direction vibration part, and a Y-direction vibration part is added to the two-dimensional vibration tester. Thus, a three-dimensional vibration tester can be obtained. (2) Both the two-dimensional vibration tester and the three-dimensional vibration tester are equipped with a vertical shaker directly on the shaking table.
There is an advantage that the vibration waveform and amplitude of the upper and lower shakers are accurately transmitted to the shaking table, thereby enabling an accurate vibration test and an advantage of enabling high-frequency vibration.

(3) The X direction vibrator is an X direction bell crank,
The vibration transmission mechanism is connected to the vibrating table via the vibrating rod, and the Y-direction vibrator is connected to the vibrating table via the Y-direction bell crank and the vibrating rod. Since the inertial mass can be reduced by configuring, it can be used for high frequency vibration. Also, since the number of shafts inserted into the holes is small, there is no problem that the performance of the vibration tester deteriorates with time. (4) Even when the center of gravity of the specimen on the shaking table is eccentric, the connecting rod or large-diameter hollow shaft offsets the imbalance of the load, so that there is an advantage that the leveling of the shaking table is maintained. Vibration such as pitching (or rolling) other than the vibration direction is not applied to the specimen.

[Brief description of the drawings]

FIG. 1 is a front view of a three-dimensional vibration testing machine.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a perspective view of a three-dimensional vibration test machine installed in a pit.

FIG. 4 is a perspective view of a large-diameter hollow shaft.

FIG. 5 is a schematic diagram illustrating the operation of each component part due to X-direction vibration.

FIG. 6 is a schematic diagram illustrating cancellation of a load imbalance caused by eccentricity of a specimen.

FIG. 7 is a front view showing a conventional example of a two-dimensional vibration tester.

FIG. 8 is a perspective view showing a conventional example of a three-dimensional vibration testing machine.

FIG. 9 is a schematic diagram illustrating an imbalance of a load caused by the eccentricity of a specimen.

[Explanation of symbols]

 39 Specimen 40, 41 Base 42 Bearing 43 Large-diameter hollow shaft 44 Horizontal bell crank 45 Vertical bell crank 46 Shaking table 47, 48 Spherical bearing 49 Vertical shaker 51, 52 Spherical bearing 53 Support rod 54 Connecting rod 55 X direction support Table 57 X-direction bell crank 59, 60 Spherical bearing 61 Exciting rod 64 X-direction exciter 66 Y-direction support base 69 Y-direction bell crank 70, 71 Spherical bearing 72 Exciting rod 73 Y-direction exciter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 7/02 B06B 1/00

Claims (3)

(57) [Claims] 1. A pair of bearings are fixed to the upper surface of a horizontally installed base, and both ends of a large-diameter hollow shaft are respectively supported by one pair of the bearings. A horizontal bell crank projecting substantially horizontally is provided at a substantially central portion of a lower surface of a shaking table having a horizontal mounting surface and an upper surface of the base opposed to the central portion, and formed at both ends of a vertical shaker. A spherical bearing for supporting spherical portions formed at both ends of a support rod parallel to the vertical shaker at the four corners of the lower surface of the shaking table and the horizontal bell cranks. A bearing is provided to constitute a Z-direction (vertical direction) vibrating portion. One end of an X-direction bell crank is pivotally mounted on the X-direction support base provided on the base, and the other end of the X-direction bell crank and the vibrating table are mounted on the X-direction bell crank. , Provided at both ends of a vibrating rod extending in the X direction (one direction in the horizontal plane) The spherical portion is provided spherical bearing for pivotally, X in the intermediate portion and the base of said X-direction bellcrank
An X-direction oscillating portion is formed by pivotally connecting both ends of the directional vibrator. One end of a Y-direction bell crank is pivotally mounted on the Y-direction support base provided on the base, and the other end of the Y-direction bell crank is connected to the other end. The vibrating table is provided with a spherical bearing that pivotally connects spherical portions provided at both ends of a vibrating rod extending in the Y direction (a direction perpendicular to the X direction in a horizontal plane). Both ends of the Y-direction vibrator are pivotally connected to the base to form a Y-direction vibrator, and a vertical bell crank is provided near both ends of the two large-diameter hollow shafts. A three-dimensional vibration test machine characterized in that both ends of a connecting rod are pivotally connected to a vertical bell crank to constitute an eccentric load adjusting unit. 2. A pair of bearings are fixed to the upper surface of a horizontally installed base, and both ends of the large-diameter hollow shaft are supported by the pair of bearings, respectively, and near both ends of the large-diameter hollow shaft. A horizontal bell crank projecting substantially horizontally is provided at a substantially central portion of a lower surface of a vibrating table having a horizontal mounting surface and an upper surface of the base opposed to the central portion, and formed at both ends of a vertical shaker. A spherical bearing for supporting spherical portions formed at both ends of a support rod parallel to the vertical shaker at the four corners of the lower surface of the shaking table and the horizontal bell cranks. A bearing is provided to constitute a Z-direction (vertical direction) vibrating portion. One end of an X-direction bell crank is pivotally mounted on the X-direction support base provided on the base, and the other end of the X-direction bell crank and the vibrating table are mounted on the X-direction bell crank. , Provided at both ends of a vibrating rod extending in the X direction (one direction in the horizontal plane) The spherical portion is provided spherical bearing for pivotally, X in the intermediate portion and the base of said X-direction bellcrank
An X-direction oscillating portion is formed by pivotally connecting both ends of a directional shaker, and a vertical bell crank is provided near both ends of the large-diameter hollow shafts, and the vertical bell cranks are opposed to each other in the large-diameter hollow shafts A two-dimensional vibration test machine, wherein both ends of a connecting rod are pivotally connected to constitute an eccentric load adjusting unit. 3. The vibration tester according to claim 1, wherein the connecting rod is parallel to the vibration table.