飞机结构应变信号的采集与预处理系统

摘要

介绍了某型飞机结构疲劳危险部位的机载应变采集与预处理系统的设计与组成.系统以Compact RIO技术构建硬件平台,通过FPGA开发,采取文件细分的思想,运用断点保护的方法,自动完成数据的采集和预处理.系统将应变数据处理成有效峰谷值,填充到频次矩阵中,解决了机载应变采集系统设备存储空间有限的问题.该系统完成了200多个飞行小时的科研试飞,结果表明系统简捷有效.%The design and the construction of in-flight strain data acquisition and preprocessing system are described for an aircraft eritical location.The system hardware platform consists of compact RIO.On the FPGA,the software can automatically complete strain data acquisition and preprocessing by file subdivision and interrupt protection.To save storage space in-flight strain data record system,the software can fill the frequency matrix with all real peaks and valleys from the strain data.Results show that the system is proved to be simple and effective by more than 200 h trial flights.