JP2000329659A - Linear motor type centrifugal force load apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a linear motor type centrifugal force load apparatus having a large radius of gyration which is moved in a tube by a linear motor to apply a larger centrifugal force to a test body. SOLUTION: In a centrifugal force load apparatus of a type running in a tube, a vibration test device 4 and a test body 5 set to a capsule-shaped container 3 are mounted to a linear motor type test body container truck 2 which runs inside a tube runway 1 of a large traveling radius, thereby letting the device and the test body run. A larger centrifugal force can be applied to the test body than in a conventional centrifugal load apparatus having a rotary arm, thus enabling deep subterranean experiments.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal force loading device which is suitable for testing a ground or other reduced model.

[0002]

2. Description of the Related Art When conducting a reproduction test of a ground or the like at the time of an earthquake, a test is performed using a reduced scale model of the ground. At this time, in a normal gravitational field, it is difficult to reproduce the behavior of a deep ground where a large stress is applied. The centrifugal force loading device suspends a sample container containing a scale model test object such as the ground at the tip of the rotating arm, and applies centrifugal acceleration to the test object by rotating the rotating arm at a high speed, thereby reducing the scale to 1 / N. N times gravitational acceleration can be given to the model. Japanese Utility Model Laid-Open Publication No. 61-46439 discloses an example of a centrifugal force loading device.

FIG. 2 shows a conventional centrifugal force loading device, in which the power of an electric motor 21 is transmitted to a rotating shaft 23 via a speed reducer 22.
The rotary arm 25 that rotates in the horizontal plane of the cylindrical pit 24 is driven. A swing gantry 26 is pin-connected to the tip of the rotary arm 25, and the swing gantry 26 is swung up with the rotation of the rotary arm 25. A sample container 27 containing a 1 / N scale model test object such as a structure or ground is placed on the swinging base 26.
The centrifugal force N times the gravitational acceleration is applied to the sample container 27 by the rotation of the rotary arm 25.

On the other hand, Japanese Patent Application Laid-Open No. Hei 9-77257 discloses an embodiment of a transfer device using a linear motor, and shows a capsule transfer device that travels in a guide tube.

[0005]

In recent years, the size of a test specimen has been increased even in a test using a centrifugal force loading device.
Due to the demand for deep-depth experiments, a centrifugal force loading device that is larger than before has been required. Therefore, in order to realize a large loading weight and a high rotation speed, it is necessary to increase the size of the rotating arm of the centrifugal force loading device. However, a problem such as bending of the rotating arm occurs due to an increase in the weight of the rotating arm, and the existing rotating diameter is about 7 m.
Seems to be near the limit.

Accordingly, an object of the present invention is to provide a linear motor-type centrifugal force loading device having a large turning radius, which runs in a tube by a linear motor in order to apply a larger centrifugal force to a test object.

[0007]

According to the present invention, a tube type traveling path and a linear motor type test object container truck are provided in place of the rotary arm of the conventional centrifugal force loading device to generate a large centrifugal force. Made it possible.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the centrifugal force loading device of the present invention in which a linear motor type test object container truck travels in a tube type traveling path will be described below.

FIG. 1 is a diagram of a tube traveling type centrifugal force loading device.

First, a traveling path is a tube-type traveling path 1 in which a linear motor type test container carrier 2 is run. It is assumed that the above-mentioned linear motor type test container trolley 2 is provided with a capsule-shaped container 3 into which arbitrary equipment can be placed. A vibration test device 4 is provided inside the capsule-shaped container 3 described above. A test body 5 having an arbitrary shape can be placed on the vibration test apparatus 4 described above.

The above-described linear motor type test container carrier 2
Can travel in the above-described tube-type travel path 1 in any direction and speed.

When the above-described linear motor type test container trolley 2 travels in the above-described tube type travel path 1, the above-mentioned linear motor type test container trolley 2 and the above-mentioned capsule-shaped Centrifugal force acts on the container 3, the vibration test device 4 and the test body 5.

The above-described linear motor type test container trolley 2 is provided with a capsule rotating device 6 for rotating the above-mentioned capsule-shaped container 3 in the circumferential direction of the cross section of the tube-shaped traveling path. By the capsule rotating device 6, the vibration test device 4 loaded with the above-described capsule-shaped container 3 and the test body 5 is rotated. By the capsule rotating device 6, the vibration test device 4 loaded with the above-described capsule-shaped container 3 and the test body 5 is moved to 9
If the specimen 5 is rotated by 0 degrees, the centrifugal acceleration generated in the specimen 5 is apparently equivalent to the gravitational acceleration of the specimen 5.

The above-mentioned linear motor type test container carrier 2
The drive signal is received by the drive signal receiving device 7 from the drive operation device 10 by radio waves or the like, and is driven by the linear motor.

The vibration test data and the like are recorded by the measuring device 11. A sensor 12 such as an accelerometer is attached to the test body 5 and the test body 5 is vibrated by the vibration test device 4. The data detected by the sensor 12 is collected by the measurement data oscillating device 8 via the cable 13. The measurement device 11 receives data transmitted by radio waves or the like by the measurement data oscillating device 8.

The mounting of the test piece 5 on the vibration test apparatus 4 is performed in front of the test piece storage 9.

If the traveling radius of the tube-shaped traveling path 1 is increased and the traveling speed of the linear motor type specimen container truck 2 is increased, the centrifugal acceleration acting on the specimen 5 is increased. It is possible to realize a large-scale centrifugal loading test device that can perform a large-depth experiment, which was not possible with a conventional centrifugal loading device having a rotating arm.

FIG. 3 shows a tube-shaped circular traveling path in which the traveling path of the tube-shaped traveling path 1 is circular. Here, the tube-shaped traveling path 1 may have an arbitrary shape such as an oval or an ellipse. The cross-sectional shape of the tube running path 1 is also an arbitrary shape including a circular shape. Further, the inside of the tube running path 1 may be filled with an arbitrary gas at first, or may be set to a vacuum or low pressure in order to reduce the running resistance of the linear motor type test object container truck 2. In addition, an arbitrary lubricant may be supplied into the tube running path 1.

The linear motor type test container trolley 2 has an arbitrary running means. For example, it may be provided with wheels and run on the tube running path 1. Or,
The vehicle may travel while levitating in the tube travel path 1 by electromagnetic force or other means. Further, the above-described linear motor type test container trolley 2 has an effective stopping means and can decelerate and stop without difficulty.

In FIG. 1, the vibration test apparatus 4 may be any of a hydraulic type, an electrodynamic type, a mechanical type or a combination thereof. Further, the vibration test apparatus 4 has a single-axis vibration with one degree of freedom, but may have a multi-axis multi-degree of freedom with a plurality of vibrators.

In FIG. 1, the test object 5 may be a real model, such as a scale model of a structure. Alternatively, not only a solid test body but also a soil model for performing a liquefaction test or any other liquid test body may be used.

In FIG. 1, the tube-shaped traveling path 1 may be a solar cell. In addition, the tube type traveling path 1
May be made of a solar transmissive material, and the test container cart may be equipped with a solar cell to be driven by solar energy.

Tube running type centrifugal force loading device In FIG. 1, a plurality of linear motor type test object container trucks 2 are used.
A plurality of centrifugal force loading experiments may be performed simultaneously.

[0024]

According to the tube running type centrifugal force loading device of the present invention, the capsule container rotatable by the capsule rotating device 6 is mounted on the linear motor type test object container truck 2 running inside the tube running path 1 having a large running radius. By mounting the vibration test device 4 and the test object 5 on the test sample 3, it is possible to apply a larger centrifugal force to the test object than in a conventional centrifugal loading device having a rotating arm, and to perform a large depth test. It can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a linear motor type centrifugal force loading device.

FIG. 2 is a side view showing a conventional centrifugal force loading test apparatus according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a tube-shaped circular traveling path according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tube type traveling path, 2 ... Linear motor type test object container truck, 3 ... Capsule container, 4 ... Vibration test device, 5 ... Test object, 6 ... Capsule rotating device, 7 ... Drive signal receiving device
8 Measurement data oscillator, 9 Test specimen storage, 10 Drive operation device, 11 Measurement device, 12 Sensor, 13 Cable, 21 Electric motor, 22 Reduction gear, 23 Rotary shaft,
24: cylindrical pit, 25: rotating arm, 26: swing base,
27 ... sample container.

Claims (8)

[Claims] 1. A linear motor-type specimen container truck equipped with a capsule-shaped container rotatable by a rotating device equipped with a test device on which a test object is mounted is caused to travel inside the tube-type traveling path. Linear motor type centrifugal force loading device. 2. A linear motor type centrifugal force loading device according to claim 1, wherein the electric motor type test container carrier is run. 3. The linear motor type centrifugal force loading device according to claim 1, wherein the solar cell driven test container carrier is run. 4. A linear motor centrifugal force loading device according to claim 1, wherein a lubricant is supplied inside the tube-shaped traveling path. 5. The centrifugal force loading device according to claim 1, wherein the inside of the tube-shaped traveling path is evacuated. 6. The linear motor centrifugal force loading device according to claim 1, wherein a plurality of linear motor type test container carriers are run and a plurality of centrifugal force loading experiments are performed simultaneously. Force loading device. 7. The centrifugal force loading device according to claim 3, wherein the tube-shaped traveling path is made of a sunlight permeable material. 8. The linear motor type centrifugal force loading device according to claim 3, wherein the tube type traveling path is a solar cell.