固体火箭发动机参数辨识

THE IDENTIFICATION OF PARAMETER OF SOLID ROCKET MOTOR

关键词:  固体火箭发动机  参数识别  参数分析

Key words:  Solid rocket engine  Parameter recognition  Parameter analysis

摘要:

固体火箭发动机参数辨识技术已得到广泛的应用,但由于影响辨识参数精度的因素很多,在应用中稍有不慎就会得不到合理的辨识结果。文中分析了影响辨识参数精度的因素,揭示了种种不合理的结果,提出了一些检验辨识结果可信性的方法。

Abstract:

The identification techniques have been widely applied to the field of SRM. But the precise of identified parameter is affeced by many foctors. Among them are the errors of experimental data, the errors of mathematic model, and the errors of material properties in the governing equations, and the unsuitable skills of identification and the unsuitable estimation of initial value of identified parameters and so on.Thus, it is necessary to carry out the creditability analysis of identification results because these results are often inaccurate.The end burning grain in which the long metal wires are embedded is used as a calculation example in this paper. The results indicate that when the deposition and erosion at nozzle throat are not considered, or the characteristic velocity is inaccurate, or the unsuitable skill of identification and the unsuitable estimation of initial value of identification parameter are employed, the results of identification are all inaccurate.The parameters measured and informations obtained in experiment could be employed to check the creditability of identified parameters.