JPS63284451A - Measuring instrument for elasticity - Google Patents

Abstract

PURPOSE:To measure the intensity of a shock and the displacement of an article at the same time by bringing a tip of a shock detection part where a load sensor and an acceleration sensor are fixed into contact with the surface of the article in a stationary state and applying an impact force from behind the detection part. CONSTITUTION:The shock detection part 5 formed by integrally fixing the acceleration sensor 7 on the load sensor 8 having a load detection terminal in the tip is held by a shock detection support frame 6 so that the detection part can moved upward and downward. The detection part 5 contracts with a load plate 9 which transmits the impact force to the article 10 on a base 11 as an object of elasticity measurement in the stationary state. Here, a weight 1 is held by an upward/downward movable support frame 2 and a shock by falling is transmitted to the detection part 5 through a buffer spring 3 under the weight 1 which adjusts the shock waveform and a shock transmission part 4. Consequently, while the signal of the acceleration sensor contacting the article is monitored, when the detection part enters the stationary state, a shock is applied to measure the intensity of the shock and the resulting displacement of the article at the same time.

Description

Detailed description of the invention (a) Industrial application field This invention measures the transient deformation of the surface of an article caused by an impact using a load sensor and an acceleration sensor that are in contact with the surface, and measures the elasticity of the article. It is used for equipment that uses

(b) Prior Art Conventionally, the elasticity of an article when an impact force is applied has been generally measured by measuring the applied force and the transient displacement of the article surface caused by it. To do this, it is necessary to insulate the displacement meter from the vibrations of the impact surface and measure changes from the stationary coordinate system, which has the disadvantages that the 'fM position becomes large and the measurement target is limited. Ta. In addition, if the deformation rate of the impact surface is required to calculate the elasticity, it can be found by differential calculation from the measured displacement.
Another drawback is that the noise component included in the measured value is amplified and the measurement accuracy is reduced.

(c) Problems to be Solved by the Invention This invention attempts to measure the transient displacement of an impact surface without using a holding device that is completely protected from vibrations, and is compact and can be used within the applicable range of the measurement target. The aim is to obtain a wide elasticity measuring device.

(d) Means for solving the problem In order to integrate the vibration acceleration generated on the impact surface to find the velocity, and further integrate to find the displacement, the initial value of the integral must be Speed and first.

The displacement value must be fixed.

In the present invention, an impact detection section, which is an integral unit of a load sensor and an acceleration sensor having a load detection end at its tip, is brought into stationary contact with the surface of an article at its tip, and an impact force is applied from behind the impact detection section. Configured the device.

As a result, the waveform of the force applied to the object under the condition that both the initial velocity and the initial displacement are 0, and the waveform of the deformation acceleration of the object surface caused by it are measured simultaneously, so it is easy to integrate and calculate the deformation speed. Displacement can be calculated.

Embodiments of the invention will be described based on the drawings.

FIG. 1 shows an example in which the impact force applied to the impact detection unit 5 is applied by dropping a weight l.

An impact detection unit 5, which has an acceleration sensor 7 fixed and integrated onto a load sensor 8 having a load detection end at its tip, is held by an impact detection unit support frame 6 so as to be movable up and down. It rests in static contact on a load plate 9 which transmits the impact force to the overlying article 10 whose elasticity is to be measured. This load plate 9 may not be present.

A weight 1 is held by a vertically movable weight support frame 2, and the impact caused by the fall is detected by a buffer spring 3 that adjusts the impact waveform at the bottom of the weight 1 and an impact transmission unit 4. The information is transmitted to section 5.

This device can be used, for example, in paving materials for sports stadiums, gymnasium floors,
One possible application is to measure the elasticity of shoe soles, etc. against relatively strong impact forces.

FIG. 2 shows an impact hammer 1 that moves by the restoring force of a spring 13 that is compressed by pulling the slide shaft 12 of the impact hammer.
4 is an example of a device that applies an impact force to the impact detection unit 5.

This device can be used to measure the elasticity of the skin and muscles of humans and animals, and is suitable for measuring relatively weak impacts in various directions.

FIG. 3 shows a diaphragm 17 to which the fluid impact pressure generated by the fluid impact pressure generator 15 is applied to the tip of the tube 16.
This is an example of a device that applies the shock to the rear part of the impact detection unit 5 through the impact detection unit 5.

This HR is suitable for transmitting impact force through a thin tube, such as when measuring the elasticity of the inside of the body or the inside of an article.

FIG. 4 shows an example of a device that applies an impact force generated by a moving coil type electromagnetic force generator 18 to the rear of the impact detection section 5. As shown in FIG.

This device is suitable for applying an arbitrary crimson waveform using a computer program or the like and measuring its elasticity.

(f) Effects of the Invention By using the method of the present invention, even if the surface of an article is shaking a little, it is possible to apply an impact by placing it in contact with the article and monitoring the signal from an acceleration sensor to detect the point at which it becomes stationary. For example, the strength of the impact and the resulting displacement of the article can be measured simultaneously. Therefore, compared to conventional elasticity measuring instruments that require a stationary coordinate system, the present invention not only can be made smaller and lighter in weight, but also has the advantage of being able to measure elasticity in places where it is difficult to set a stationary coordinate system, such as inside the body.

[Brief explanation of the drawing]

The figure shows an embodiment of the elasticity measurement H position of the present invention, and FIGS. 1, 2, 3, and 4 show the 11th, 2nd, 3rd, and 4th embodiments, respectively.

Claims (1)

[Scope of Claims] 1. An impact detection section, which is an integral unit of a load sensor and an acceleration sensor having a load detection end at the tip, is brought into stationary contact with the surface of the article at the tip, and an impact is detected from behind the impact detection section. An elasticity measuring device that applies force. 2. The elasticity measuring device according to claim 1, wherein the impact force is applied by dropping a weight. 3. The elasticity measuring device according to claim 1, wherein the impact force is applied by the restoring force of a spring. 4. The elasticity measuring device according to claim 1, wherein the impact force is applied by fluid pressure via a diaphragm. 5. The elasticity measuring device according to claim 1, wherein the impact force is applied by electromagnetic force.