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对复合材料结构的冲击事件进行机载在线监测具有迫切的应用需求。面向机载研制了一种基于两级判别逻辑的小型化冲击区域监测系统。首先,提出了一种基于两级判别逻辑的冲击区域定位算法,能够在大规模可编程逻辑门阵列(FPGA)中实现基于冲击数字序列的冲击事件在线记录,并提高了冲击区域定位的准确性。其次,研制了小型化冲击区域监测系统,采用无源滤波器和比较器,将压电传感器输出的冲击响应信号直接转换为冲击数字序列,采用FPGA替代数字电路并实现冲击监测,简化了常规冲击监测系统的电路,降低了系统的尺寸和功耗。系统具有体积小、重量轻、功耗低以及支持传感器数目多的特点。验证结果表明:该系统能够正确响应每次冲击事件并能准确定位冲击发生的区域。
The on-board on-line monitoring of the impact of composite structures has urgent application needs. Aiming at airborne, a miniaturized impact area monitoring system based on two-stage discriminant logic is developed. First of all, a collision zone locating algorithm based on two-level discrimination logic is proposed, which can record the impact events online based on the impact sequence in a large-scale programmable logic array (FPGA) and improve the accuracy of impact zone positioning . Secondly, a miniaturized impact area monitoring system is developed. Passive filters and comparators are used to directly convert the impulse response signal output by the piezoelectric sensor into an impulse digital sequence. The FPGAs are used instead of digital circuits for impact monitoring, which simplifies the conventional impact Monitoring system circuitry reduces system size and power consumption. System has a small size, light weight, low power consumption and support the number of sensors and more features. The verification results show that the system can correctly respond to each impact event and accurately locate the impact area.