飞机模拟量采集系统误差分析
2016-05-19呼明亮邓道杰李兴智梁哲
呼明亮++邓道杰++李兴智++梁哲
摘要:该文分析了飞机模拟量采集系统的硬件电路特点,按照误差的特点和性质将其区分为系统误差、随机误差和偶然误差,并分析了误差产生的原因。针对系统误差,消除了通道切换误差,并修正了地线误差;针对随机误差和偶然误差,介绍了3[σ]准则和Dixon准则,剔除了偶然误差可疑点,采用均值理论消除了随机误差的影响。实验证明,该文提出的误差抑制方法能有效提高飞机模拟量采集系统精度,对提升飞机机电系统控制性能具备重要的现实意义。
关键词:模拟量采集;误差分析;Dixon准则;均值理论
中图分类号:TP391 文献标识码:A 文章编号:1009-3044(2016)07-0234-03
Analysis of Error Based on Aircraft Analog Acquisition System
HU Ming-liang, DENG Dao-jie, LI Xing-zhi, LIANG Zhe
(Xi'an Aeronautics Computing Technique Research Institute, AVIC, Xi'an 710065, China)
Abstract:According to the characteristics and nature of the error, which is divided into systematic error, random error and random error, this paper analyzes the causes of error and the characteristics of the aircraft hardware circuit analog acquisition system. For systematic errors, a method to eliminate channel switching error and ground error is introduced. For random error and random errors, 3σ and Dixon criteria are introduced to exclude the suspicious point. Using the mean theory, the effect of random errors is eliminated. Experimental results show that the proposed methods can effectively improve the accuracy of the aircraft analog acquisition system and have important practical significance to enhance the performance of the aircraft control electromechanical system.
Key words: analog acquisition system; error analysis; Dixon criterion; mean theory
“科学始于测量”,测量技术是影响现代飞机机电系统控制性能的关键因素。但由于测量方法和测量电路的不完善,周围电磁环境的影响,以及人们认知能力的限制,测量值和真实值之间总是存在偏差,在数值上表现为误差。误差存在的普遍性和必然性,证明不可能完全消除误差。因此,研究飞机模拟量采集系统误差产生的原因和传递过程,达到认识误差并进而减小或消除误差,对提升飞机机电系统控制性能具备重要的现实意义。
本文针对飞机模拟量采集系统的硬件电路特点,按照误差的特点和性质将其区分为系统误差、随机误差和偶然误差,分析了误差产生的原因,对采集结果进行了数据处理,并对硬件电路提出了改进方法,最终实现了模拟量采集系统的高精度采集。……
