Wireless-type transient-strain storage-testing system

Abstract

The invention relates to a wireless-type transient-strain storage-testing system, in particular to the wireless-type transient-strain storage-testing system for outer-field explosive-impact tests, which belongs to the technical field of signal detection. The system comprises a control-center node and one or more than one testing nodes, wherein the testing node is formed from a strain foil, a storage-testing module and a first wireless-transmitting module; and the control-center node is formed from a second wireless-transmitting module and a computer-interface module. Since a wireless technology is adopted in the invention, the resistance error of a long lead can be eliminated, the influences of environmental temperature and humidity on the long lead are reduced, the interferences of impact waves and an ionizing field for the lead are reduced during the explosive reaction in the outer-field tests, and the testing reliability is improved; the testing nodes are conveniently increased and decreased and are not limited by the lead; and strain data are more convenient, rapider and more reliable in acquisition without building or searching a sheltering place for instruments or laying testing cables on the spot, and manpower and material resources are saved.

Description

technical field [0001] The invention relates to a wireless transient strain storage test system, in particular to a wireless transient strain storage test system used for an explosion impact test in an external field, and belongs to the technical field of signal detection. Background technique [0002] Transient strain test is different from quasi-static or dynamic strain test. It is mainly used to measure the transient strain change of the target caused by explosion or impact. It is characterized by short action time and fast signal frequency. The main methods of strain test are optical measurement The electrical measurement method, the magnetic measurement method and the electrical measurement method have been widely used because of its simplicity, convenience, wide application, good dynamic characteristics, large measurement range and strong adaptability. [0003] However, the current electrical measurement method adopts the traditional lead design method: that is, the re...

AI Technical Summary

Problems solved by technology

[0004] 1. The measurement error increases: the resistance of long wires cannot be ignored compared with the resistance of strain gauges, resulting in a small measured value of strain; the ambient temperature and humidity of the external field change greatly, and the temperature drift of wire resistance will change with the change of ambient temperature. Changes, the distributed capacitance of the wire due to the change of the insulation resistance caused by the ambient humidity is also very large, resulting in a drift in the measured value or a relatively large reading error

[0005] 2. Large interference noise: Explosion shock waves are usually accompanied by strong flames, strong shock wave fields and strong ionization fields, which will seriously interfere with the measured signal

The long-term transmission of analog signals is very easy to introduce the series mode and common mode interference of various noises in the external environment; in addition, when the shock wave acts on the signal transmission cable, false signals will be generated due to the "cable effect", which will be superimposed on the measured signal and cause interference

[0006] 3. System calibration and calibration are complex: the strain sensors, signal transmission cables, front adapters, and oscilloscopes that make up the test system are all separated from each other, and the strain gauges currently used need to be manually adjusted and self-tested. Therefore, the entire test system The calibration is cumbersome and difficult to calibrate

[0007] 4. Inconvenient on-site layout: the shock wave is more destructive, the transmission cable and its connectors are often damaged, and the quality of the transmission cable and its connectors, and the installation and laying process of the explosion-site cable directly affect the accuracy of the test data. On-site fixing and protection requirements are high, resulting in very inconvenient layout and heavy workload

Images