一种发动机性能参数衰退的估计方法

An estimation method of engine performance parameter deterioration

发动机性能参数是不能通过测量得到的,但性能参数却直接反映各部件性能状况,因此研究发动机性能参数变化很有实际意义。本文考虑两种情况,一种情况发动机测量参数个数少于待估性能参数,另一种情况是测量参数个数等于待估性能参数。对于前者,通过整体上假定各性能参数服从线性衰退趋势,建立非线性约束估计发动机性能参数;对于后者,本文设计一方法,基于发动机稳态模型,通过求解非线性方程组,估计部件性能参数。考虑这两种方法的不足,提出一种新的性能参数估计方法。结果表明,新的估计方法更为有效,结果与实际更相符。

Engine performance parameter is not gained by measured parameter, but performance parameter directly expresses every component performance, therefore there is factual meaning to research change of engine performance parameter. Two conditions are considered, one condition is that number of measured parameter is less than performance parameter, the other condition is that measured parameter equals to performance parameter. For former condition, engine performance parameter is gained by whoiely presuming that performance parameter submit linear deteriorating trend and establishing nonlinear constriction; for latter condition, this paper designs a estimation method, engine performance parameter is gained by solving nonlinear equation based on engine stable model. Considering disadvantage of two methods, a estimation method of new performance parameter is proposed. The result indicates new estimation method is more valid, corresponding with factual condition.