JPH0217313Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a vibration testing device.

As a conventional vibration test apparatus, there is one as shown in FIG.
is about to be installed.

By the way, some vibration tests require applying vertical and horizontal excitation forces to the test object c without changing the posture of the test object c.

However, in the conventional vibration testing apparatus shown in Fig. 1, although the vertical excitation force can be applied in the state shown in Fig. 1, the excitation force in the horizontal direction is generated, as shown in Fig. 2. Even if the vibrator a is rotated 90 degrees with respect to the base d as shown in
The direction of the excitation force on the test object c cannot be changed because it rotates 90 degrees at the same time.

Therefore, in such a case, in Figure 2,
The test object c is removed from the vibration table b, and then reattached to the vibration table b so that the test object c maintains its original position (the longitudinal direction of the test object c is in the vertical direction). However, with these conventional methods, testing is time-consuming, and depending on the shape of the test object, the mounting means may differ depending on the shape of the test object, depending on the shape of the test object. There is also the problem that it is necessary to use a special jig, which increases extra weight and limits the range of use.

Therefore, if the test object is heavy, a dedicated horizontal shaking table is required.

This invention aims to solve these problems, and is a vibration testing device that has a simple configuration and can apply excitation force from a desired direction without changing the posture of the test object. The purpose is to provide

For this reason, the vibration test device of the present invention includes a frame-shaped vibration table on which a test object can be mounted on an outer wall, and an excitation force on which an excitation force can be transmitted to the vibration table through an operating end that can come into contact with the inner wall of the vibration table. In order to apply an excitation force in a desired direction to the test object without changing the mounting position of the test object, the operating end of the vibration exciter is removably connected to the vibration table. The vibration exciter is characterized in that its posture can be relatively adjusted inside the vibration table.

Hereinafter, a vibration testing device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 3 is a cross-sectional view showing its overall configuration, and FIGS. 4 and 5 are both schematic diagrams for explaining its operation. .

As shown in FIG. 3, a hydraulic vibrator A is rotatably supported on a support portion 2 on a fixed base 1 via a shaft 3 integral with a cylinder C thereof.

The vibration exciter A includes a cylinder C and a piston 4 fitted within the cylinder C, and two chambers 5 and 6 are formed within the cylinder C by the piston 4.

Furthermore, two oil passages 7 and 8 are formed in the shaft 3, and one end of each oil passage 7 and 8 is connected to an electric/hydraulic type via a hydraulic slip ring (not shown). It is connected to the servo valve 9. and,
The other end of the oil passage 7 is connected to the chamber 5, and the other end of the oil passage 8 is connected to the chamber 6.

Note that the servo valve 9 is connected to a pump via a hose 10 and to a reservoir via a hose 11.

Therefore, by operating the servo valve 9, the oil passages 7 and 8 can be alternately communicated with the pump side or the reservoir side.

Further, a piston rod 12 is connected to the piston 4, and the piston rod 12 liquid-tightly penetrates both end surfaces of the cylinder C. At both ends of the piston rod 12, there are pads 13 having an arc-shaped outer circumferential wall and serving as the actuating end of the exciter.
are installed respectively.

Note that the distances from the piston 4 to each pad 13 are set equal, and each pad 13 is arranged point-symmetrically with respect to the piston 4 in the neutral position.

By the way, the annular vibration table 14 is provided so that its inner circumferential wall is brought into contact with the outer circumferential wall of each pad 13.

Further, this vibration table 14 and each pad 13 are provided in a detachable manner. That is, when the bolt 15 is tightened, the vibration table 14 and the pad 13 can be engaged with each other, and when the bolt 15 is removed, the vibration table 14 can be engaged with the pad 13.
The engagement between the pad 13 and the pad 13 can be released.

Therefore, when the vibration table 14 and the pad 13 are coupled, the excitation force of the vibrator A can be transmitted to the vibration table 14 via the pad 13, and the vibration table 14
When the pad 13 is disengaged, the vibration exciter A is relatively rotated around the shaft 3 inside the vibration table 14 while the vibration table 14 is held in a predetermined position. A's posture can be adjusted.

In addition, a total of four flat parts 18 for mounting the test object are formed at 90° intervals on the outer peripheral wall of the vibration table 14, and the test object 16 is mounted on one of the flat parts 18.
It is designed to be installed on 8.

Note that the reference numeral 17 in FIG. 3 indicates a non-contact type displacement detector that detects the relative displacement between the cylinder C and the pad 13, and this displacement detector 17 includes:
For example, a differential transformer is used.

With the above-described configuration, when performing a vibration test by applying vertical and horizontal excitation forces to the test object 16 without changing its mounting orientation, the following steps are performed.

First, the test object 16 is mounted on the flat part 18 of the outer circumferential wall of the vibration table 14, and the vibration exciter A is placed in an upright position as shown in FIG. Fix it with. If necessary, a dummy (not shown) having the same weight as the test object 16 is attached to the flat part 18 spaced 180 degrees from the mounting part of the test object 16.

After that, it is only necessary to fix the shaft 3 to the support part 2 with a stopper (not shown) and operate the servo valve 9. As a result, the vibration exciter A generates an excitation force in the vertical up and down direction. The force is transmitted to the test object 16 via the pad 13 and the vibration table 14.
In this manner, a vibration test can be performed by first applying a vertical excitation force to the test object 16.

After performing the vibration test in which the excitation force is applied in the vertical direction, the bolts 15 are removed and the vibration exciter A is rotated 90 degrees around the axis 3 with the vibration table 14 fixed. Then, place it in a horizontal position as shown in Figure 5. After the posture of the vibration exciter A has been relatively adjusted inside the vibration table 14 in this way, the bolts 15 are tightened again, and the vibration table 14 and the pad 13 are retightened.
and fix it. At this time, even if the vibration exciter A rotates relatively, the vibration table 14 does not rotate, so the posture of the test object 16 does not change.

After that, as in the case described above, it is sufficient to fix the shaft 3 to the support part 2 with a stopper (not shown) and operate the servo valve 9, thereby causing the vibration exciter A to apply horizontal excitation force. This excitation force is transmitted to the test object 1 via the pad 13 and the vibration table 14.
6.

As a result, without changing the posture of the test object 16,
Applying a horizontal excitation force to this test object 16,
Vibration tests can be performed.

The relative displacement between the cylinder C and the pad 13 at this time is detected by a displacement detector 17, and this detection signal is used as a feedback signal for the servo valve 9, etc.

Incidentally, when the test is carried out by attaching the dummy to the vibration table 14, the test can be carried out in a well-balanced state.

Alternatively, the excitation force may be applied first in the horizontal direction and then in the vertical direction.

As the vibration table 14, in addition to a ring-shaped one, a frame-shaped one of an appropriate shape can also be used.

As detailed above, the vibration test device of the present invention has a simple configuration and can apply an excitation force in a desired direction to the test object without changing the mounting position of the test object. This has the advantage that the required operations are simplified and vibration tests can be carried out efficiently.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams for explaining the operation of a conventional vibration test device, and FIGS. 3 to 5 show a vibration test device as an embodiment of the present invention. is a cross-sectional view showing the overall configuration, and both FIGS. 4 and 5 are schematic diagrams for explaining the operation. 1... Fixed base, 2... Support part, 3... Shaft, 4...
... Piston, 5, 6 ... Chamber, 7, 8 ... Oil passage, 9 ... Servo valve, 10, 11 ... Hose, 12 ... Piston rod, 13 ... Pad as the operating end of the exciter, 14 ... ...Vibration table, 15...
Bolt, 16... Test object, 17... Displacement detector, 18... Flat part for mounting the test object, A... Vibrator, C... Cylinder.

Claims (1)

[Scope of utility model registration request] A frame-shaped vibration table capable of mounting a test object on an outer wall, and a vibrating machine capable of transmitting an excitation force to the vibration table through an operating end that can come into contact with the inner wall of the vibration table, and mounting the test object. In order to apply an excitation force in a desired direction to the test object without changing its position, the operating end of the vibrator is removably connected to the vibration table, and the vibrator changes its position to the vibration table. A vibration testing device characterized by being relatively adjustable within a stand.