Non-contact measurement and experimental study on complex dynamic motion under high impact
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摘要: 具有短间隔连续冲击加载能力的多次冲击试验台是实验室验证多层侵彻引信高冲击性能和多层起爆控制策略的关键设备，其运动件在高冲击下的运动规律对过载加速度的一致性有着重要影响。针对连续高冲击加载下复杂动态运动过程测量的技术难题，研究了一种基于高速摄影及图像处理算法的非接触式测量方法，通过背景差分和特征点检测的方法获得了运动件特征点的像素坐标，结合亚像素处理算法，进一步提升了测量精度；通过对比试验和动力学仿真对高速摄影测量结果进行了验证，证明了该方法应用于高冲击加载下复杂动态运动过程测量的合理性与可行性，为多次冲击实验台的进一步优化设计提供了支撑，也丰富了现有的高动态运动过程测量手段。Abstract: The multiple impact equipment of short interval and multiple impact loading is the key equipment to verify the high impact resistance and initiation control strategy for multi-layer penetration fuze in laboratory, the motion law of the moving part under high impact has an important influence on the consistency of acceleration. In view of measurement problem of complex dynamic motion process under multiple high impact, a non-contact measurement method based on high-speed photography and image processing was presented, obtaining pixel coordinate of feature point of the moving part by background difference and feature point detection, combining with the sub-pixel algorithm, further improving the accuracy of measurement. The results of high-speed photography were verified by contrast experiment and dynamic simulation, proving that the method is reasonable and feasible for complex dynamic motion process measurement under high impact, providing support for optimal design of the multiple impact equipment, also enriching the existing methods of complex dynamic motion measurement.
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Key words:
- multiple impact /
- complex dynamic motion /
- non-contract measurement /
- sub-pixel
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