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为解决整机条件下难于直接获得部件全部特征参数的问题,在计算发动机部件特征参数对整机性能敏感度的基础上,利用条件数分析参数之间的相关性最终确定可修正参数数量.这样即可构造工程上可解的辨识问题,并通过最小二乘法求解.仿真计算结果显示:高压压气机效率为0.982与初设值0.98一致,说明该方法从理论上是可行的.从具体实例的辨识结果来看,有压气机后温度测试时部件效率降低量值符合实际结果;无压气机后温度测试时高压压气机效率较设计状态偏高12.7%,不符合实际发动机工作情况.显然辨识问题是病态的,为此可修正参数不应超过6个.
In order to solve the problem that it is difficult to directly obtain all the characteristic parameters of the whole part under the condition of the complete machine, the parameter of the parameter can be finally determined by analyzing the correlation between the characteristic parameters of the engine part and the performance of the whole machine by analyzing the correlation between the parameters We can construct an engineering problem that is solvably solvable and solved by the least squares method.The simulation results show that the efficiency of high pressure compressor is 0.982 which is consistent with the initial value of 0.98.It is proved that this method is theoretically feasible.From the concrete example According to the recognition results, the value of component efficiency reduction after the compressor temperature test is in line with the actual results. The high-pressure compressor without post-compressor temperature test is 12.7% more efficient than the designed one, which is inconsistent with the actual engine operation. Is morbid, for which no more than six parameters can be corrected.