基于机载模型的轴向柱塞泵动态特性参数辨识及影响分析

Identification of Dynamic Characteristic Parameters for Axial Piston Pump and Influence Analysis Based on On-Board Model

关键词:  航空发动机  轴向柱塞泵  变量调节机构  动态特性  参数辨识  机载模型

Key words:  Aero-engine  Axial piston pump  Variable regulator mechanism  Dynamic characteristic  Parameter identification  On-board model

摘要:

针对航空发动机柱塞泵动态特性解析模型复杂、阶次高、计算资源需求大、参数多且难以准确确定的问题，在忽略解析模型高阶特性得出简化的机载模型基础上，提出了基于典型环节特征参数的时域阶跃响应辨识方法，得到柱塞泵的动态参数。仿真分析和试验结果表明，简化模型精度可达95%，计算资源需求少，为柱塞泵机载模型应用奠定了基础。同时，基于动态模型分析了柱塞泵动态响应对伺服控制动态响应的影响，柱塞泵动态特性应在伺服回路动态特性4倍以上，国军标中规定的柱塞泵动态特性要求可满足航空发动机喷口控制要求。

Abstract:

The dynamic analytical model of aero-engine axial piston pump is complicated， has high order and a great number of estimated parameters and needs large demand for competing resources. Based on the simplified dynamic on-board model disregarding the high order characteristics of the analytical model， a new identification method based on the step response of typical transfer function characteristic parameter was proposed， and the dynamic parameters of the piston pump were estimated. The simulation and experimental results show that the accuracy of the simplified model can reach up to 95% and the simplified model requires less competing resources， which provides a basis for the application of on-board model. Meanwhile， the influence on dynamic characteristic of the servo control loop is analyzed based on the piston pump dynamic model，the bandwidth of piston pump should be at least 4 times of the servo control loop and the dynamic characteristic specified in the national military standard can meet the requirement of the aero-engine nozzle control.