JPS6256838A - Acceleration tester - Google Patents

Abstract

PURPOSE:To test acceleration precisely by varying acceleration given to a body to be measured on a rotary disk which is rotated at a constant speed by moving a measurement table where the object body is mounted radially. CONSTITUTION:A rotating body 4 is fitted between upper and lower plates 11 and 12 of a fixed frame 1 across bearings 2 and 3 and the worm gear 7 of the output shaft of a motor 6 is engaged with a worm gear 5 provided to the rotating shaft 41 of the rotating body 4 to drive the rotating body 4 at the constant speed by the motor 6. The rotary disk 42 is provided to this rotating body 4 and the body A to be measured is installed on the disk 42 at an optional tilt angle to the measurement table 8 through a fitting angle adjusting member 9. The measurement table 8 is fitted so that it moves radially on the disk through a linear moving mechanism 13 which uses a stepping motor 10 provided to the disk 42 as a driving source. Therefore, the acceleration G given to the object body A is varied in proportion to the radius (r) when the rotating speed of the disk 42 is constant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acceleration tester that performs a response test using acceleration of an object to be measured.

In general, since work vehicles such as tractors are often used in work sites with severe ups and downs, tilt detection is installed on the vehicle body to detect pendulum movement beyond a certain level. The vehicle is equipped with a device that detects when the vehicle body is tilted beyond a certain level, issues an alarm, and controls the vehicle's attitude.

However, in a tilt detection device using a pendulum like this,
The pendulum does not simply tilt according to the inclination of the vehicle;
It also responds to the acceleration that acts on the vehicle body when the vehicle starts or stops, and therefore it is necessary to test the effects of various magnitudes of acceleration on the tilt detection device. In particular, work vehicles such as tractors are started with a large acceleration force in order to increase their work efficiency, so this relatively large acceleration force may continue for more than 2 seconds, so this effect can be considered in advance. I need to test it.

Conventionally, acceleration testing machines that perform response tests using acceleration of objects to be measured, such as inclination detection devices, place the object on a rotating disk and act on the object while changing the rotational speed of the disk. The magnitude of the acceleration is varied in various ways, and an acceleration sensor attached to the object is used to measure the response characteristics of the object according to the changing acceleration pattern. It has become difficult to accurately obtain a predetermined acceleration pattern through control. Particularly, when repeated tests are performed in which the acceleration is increased and decreased to a predetermined value, the variation in the acceleration applied to the object to be measured is large, making it difficult to obtain accuracy.

1 line The present invention has been made in consideration of the above points.

An object of the present invention is to provide an acceleration testing machine that can accurately apply a predetermined acceleration to an object to be measured using an arbitrary acceleration pattern with a simple configuration.

In order to achieve the object, the present invention includes means for rotating a table at a constant speed, and a table provided on the table on which the object to be measured is placed, while the table is rotating at a constant speed. An acceleration tester is configured to apply acceleration to the object to be measured by means of arbitrarily positioning and moving the object in the radial direction.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the acceleration testing machine according to the present invention, as shown in FIG. 1 and FIG.
The rotating body 4 can be driven at a constant speed by the motor 6 by attaching the rotary body 4 to the worm gear 5 provided on the rotating shaft 41 of the rotating body 4 and meshing the worm 7 provided on the output shaft of the motor 6. That's what I do.

Further, the rotating body 4 is provided with a rotating disk 42, and a measuring table 8 on which the object to be measured is placed is attached onto the rotating disk 42.

The measuring table 8 is provided with mounting angle adjusting members 9 arranged in stages for arbitrarily setting the inclination angle when fixing the object to be measured. Further, the measuring table 8 is attached so as to be movable in the radial direction of the rotating disk 42 by a linear movement mechanism 13 whose driving source is a step motor 10 attached to the rotating disk 42 side. Here, the linear movement mechanism 13 includes a worm 131 provided on the output shaft of the step motor 10 and a linear gear 132 provided to mesh with the worm 131 and move in the radial direction with respect to the rotating disk 42. Using that linear gear 1
A measuring stand 8 is attached on the top of the measuring table 32. Also,
This linear movement mechanism 13 can also be configured by other means such as a link mechanism. Note that, as shown in FIG. 3, the rotating disk 42 has a slit 14 formed therein so that the measuring table 8 can be moved in the radial direction.

゛ Furthermore, the measurement table 8 is equipped with an acceleration sensor (not shown).
The output line of the acceleration sensor is connected to the slip ring 15 attached to the rotating shaft 41 through the inside of the rotating shaft 41, and the brush 1 is connected there to the slip ring 15 attached to the rotating shaft 41.
6, the output signal of the acceleration sensor is applied to a measurement unit 17 provided on the fixed side. Similarly, the output signals of various sensors that detect the response state due to the acceleration of the object to be measured can also be taken out to the measurement unit 17 through the slip ring 15 and the brush 16.

However, in the device configured in this way, the measuring table 8 on which the object to be measured is placed is moved and positioned as appropriate in the radial direction while the rotating disk 42 is rotating at a constant speed. It becomes possible to perform response tests on the object to be measured using accelerations of various magnitudes.

That is, as shown in FIG. 4, if an object to be measured A having a mass m is placed at a position at a radius r from the center O of a rotating disk 42 having a radius R, the rotating disk 42 has a radius R.
If G is the acceleration that acts on the object A when the object A is rotating at a constant angular velocity ω, then the object A has mG.
A centrifugal force F is acting. Also, F = m rω2
From the equation of motion, we can find the relationship G=rω2,
When the rotational speed of the rotating disk 42 is constant, the acceleration G acting on the object to be measured A is proportional to its radius r. Therefore, by moving the object to be measured A placed on the rotary disc 42 which is rotated at a constant speed in its radial direction, the value of the acceleration G acting on the object to be measured A can be changed. At this time, the acceleration G becomes zero when r-0 (when the object to be measured A is at the center O position of the rotating disk 42), and as r increases, the acceleration G linearly increases, and when r=R. When the acceleration G becomes maximum.

Therefore, as shown in FIG. 5, when the angular velocity ω of the rotating disk 42 is taken as the parameter ω1-ω4, various acceleration G characteristics with respect to the radial distance r are obtained according to each angular velocity.

Therefore, while rotating the rotating disk 42 at a constant speed, the measuring table 8 on which the object to be measured is moved to a predetermined position in the radial direction of the rotating disk 42, and at the same time, the moving position of the measuring table 8 and the By changing the speed, changing the constant rotation speed of the rotary disk 42, or moving the measuring table 8 back and forth in a fixed interval, the object to be measured can be measured in various patterns, as shown in FIG. 6, for example. It becomes possible to apply acceleration. Further, after roughly setting the acceleration acting on the object to be measured by changing the constant rotation speed of the rotating disk 42, fine adjustment of the acceleration acting on the object to be measured is performed by moving the measuring table in the radial direction. You can also make it possible to do so.

As described above, the acceleration testing machine according to the present invention can apply a predetermined acceleration to a measured object with an arbitrary acceleration pattern with a simple configuration, and can perform response tests using acceleration of the measured object. It has the excellent advantage of being able to perform well.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of an acceleration testing machine according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a plan view of a rotating disk portion in the same embodiment. FIG. 4 is a diagram showing the relationship between the acceleration acting on the object to be measured placed on the rotating disk, and FIG. 5 is a diagram showing the acceleration characteristics with respect to the placement position of the object to be measured in the radial direction on the rotating disk. FIG. 6 is a diagram showing characteristics of various acceleration patterns applied to the object to be measured.

Claims (1)

[Claims] Acceleration configured by means for rotating a table at a constant speed, and means for moving a table provided on the table on which an object to be measured is placed in the radial direction of the table while the table is rotating at a constant speed. testing machine.