Research On Strain Measurement Of Artillery Key Components Based On Fiber Grating Sensors

One of the important ways to improve the performance of the artillery is the research of key components and important parts in dynamic strain process. Measuring the instantaneous strain of the key components and important parts in artillery launching accurately can provide significant reference on the designing of the artillery weapon system’s structural strength and stiffness and on the analysis of fatigue damage. It’s hard to analyse comprehensively on the whole equipment system due to the traditional finite meta-analysis partly simplifying the real structures of artillery, so it’s not convinced that this kind of results of calculations fail in providing test results. And the measurement that based on the resistance strain gauge is easily influenced by temperature, humidity and other environmental aspects. What’s more, the resistance strain gauge and the bridge circuit are easily interfered by electromagnetism, and it just fits for common environment which is hard to measure the strain accurately in a hostile and complicate environment.This research is based on the strain test method of Fiber Bragg Grating (FBG) sensing and it firstly put forward that using FBG sensors to measure the strain of the key components and important parts in artillery launching. The paper designs and conducts experiment of universal testing machine stretch, the experiment of equal strength cantilever beam and the measurement of temperature separation on the basis of the research of the FBG sensing theory, which verify the feasibility and accuracy of FBG sensors in the field of strain measurement by comparing the data of the resistance strain gauge measurement, the relevant digital image measurement and FBG sensors strain measurement with theoretical data. Dynamic strain experiments can be put into practice and FBG sensors technology will be applied on the strain test of the Hopkinson pressure bar and the artillery prototype firing experiment to acquire the strain data. Uncertainty analysis of the data of FBG strain measurement will be conducted in order to show the quality of the results and get the reliability of the results, which verify the accuracy of the FBG strain test and the good anti-interference ability.This paper firstly uses the FBG sensors to measure the strain of the key components and important parts on the artillery weapon system in China, the strain data can not only provide important reference on the designing of the artillery weapon system’s structural strength and stiffness and on the analysis of fatigue damage, but also overcome the electromagnetic interference of the traditional strain gauge. The innovation method is provided for the strain test of weapon equipment with strong electromagnetic interference source, such as electromagnetic artillery which enrich the technical means of the artillery strain testing.