航空发动机FADEC系统软件浮点数计算精度分析

摘要

The calculation precision and operation efficiency of aero-engine FADEC system control software are a pair of indispensable features.To improve the computing accuracy and operating efficiency,the aero-engine FADEC software design has been evolved from fixed-point arithmetic to floating-point arithmetic.The error and accuracy of IEEE 754 floating-point number representation are analyzed.Some engineering project cases show the correctness of the analysis.Based on the analysis,some criteria of floating-point algorithm design have been proposed to improve the safety and reliability of FADEC software.Also the criterion can be generalized to other industrial control domain applications.%航空发动机FADEC系统控制软件的计算精度和运行效率是一对不可缺少的特性.为提高航空发动机FADEC系统控制软件的浮点计算的计算精度和运行效率,从IEEE 754浮点数格式、浮点数的表示形式、浮点数四则运算的精度方面展开分析,并结合FADEC系统控制软件项目实际应用案例的数据结果,验证了精度分析结果的正确性,并以此为基础针对FADEC系统控制软件的浮点算法设计提出了设计准则,有助于提高控制软件的可靠性和安全性,可推广至其他行业的控制领域应用.