Area Array Dynamic Stress Sensor

Abstract

The invention relates to a sensor device and method for testing the dynamic stress of an area array. The area array piezoelectric sensor consists of a number of independent piezoelectric stress sensors pasted on the flexible accessory board, the minimum spacing of which is the size of the sensor, and the wires of each sensor are collectively connected to the terminal. The sensor includes a metal protection layer, a rubber encapsulation layer, a piezoelectric film, an electrode adapter and a miniature charge amplifier. Each sensor is provided with a miniature charge amplifier and a resistor, the power input port and the signal output port are respectively connected with the amplifier, and the ground electrode of the sensor is connected with the power ground electrode. The invention includes an area array piezoelectric sensor, a connection terminal and an acquisition card, and the acquisition card is connected to a computer for data acquisition. The invention obviously improves the equivalent modulus and dynamic performance stability of the stress sensor, can accurately and simply test the dynamic stress distribution of the entire section of the subgrade, and can be used for testing the dynamic stress of the soil subgrade in fields such as railways, highways and airports.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering sensors, and in particular relates to a sensor device and method for testing the dynamic stress of an area array. Background technique [0002] At present, a large number of high-standard high-speed railways, highways and airports are being built in my country. In order to ensure the good stability and durability of the facilities, high requirements are placed on the substructure, including transient dynamic characteristics and long-term stability etc. As an important part of the substructure, the soil subgrade bears the static load of the superstructure and also bears the dynamic load caused by the high-speed operation of the upper moving body (trains, cars and airplanes, etc.). With the gradual improvement of construction standards, soil quality The research on the dynamics of subgrade is more and more important. The load conditions and dynamic response of the subgrade are the ...

AI Technical Summary

Problems solved by technology

[0006] China Patent No. 200710020948.3 discloses a "Laser Surface Acoustic Wave Stress Test System", which uses short-pulse lasers to generate high-frequency ultrasonic surface waves on the surface of the tested sample, and uses PVDF piezoelectric film as the receiving device for ultrasonic surface waves , the stress value is obtained according to the principle of acoustoelasticity. Although the system can measure the stress distribution on the surface of the sample, it is only suitable for stress testing on the surface of metal materials.

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