侵彻弹弹体应变存储测试系统设计

针对侵彻弹在侵彻过程中弹体结构的变形导致弹内炸药几何特性变化引起爆燃爆轰的问题，为获得该过程中的弹体应力应变状态，设计了一种侵彻弹弹体应变存储测试系统。该系统基于FPGA+STM32双控制器，实现多路应变信号调理采集、数据存储和通信等功能。系统采用应变信号作为内触发信号，采用数字电位计实现应变电桥自动平衡调节，以减小温度变化、应变片粘贴变形等因素导致的应变信号偏置；采用单片机程控电源设计定时启动采集系统以减少待机功耗。模拟实验结果表明，该系统能够完成对8路应变信号的采样及数据存储工作，对侵彻过程中弹体应力应变测试有着一定的工程意义。

Design of storage test system for strain measurement of bullets penetration

Aimed at the deflagration and detonation problem caused by the geometrical features change of bullet gunpowder brought by bullet structure deformation during the penetration process, a projectile-borne storage testing system was developed to acquire the stress and strain state of projectile. This system based on FPGA+STM32 dual controller realized the function of multi-channel strain signal conditioning collection, data storage and communication. The system adopted the strain signal as the inner trigger signal and used the digital potentiometer realizing the automatic strain bridge balancing to reduce the strain signal offset caused by temperature variation and strain gauge sticking deformation. The STM32 program-controlled power supply is used to launch the main acquisition system at fixed time to reduce the power consumption. The verification test shows that the system can complete the sampling and data storage of strain signals, and it has certain application value for penetrating strain test.