基于模型重构的航天器部件级故障建模方法

摘要

提出了基于模型重构的航天器部件级故障建模方法，从对象固有模型出发通过模型重构建立对象故障模型，定义了统一故障模型形式。将功能单元作为研究故障的最小单位，定义了功能单元的划分准则。建模过程包括对象仿真模型建立、对象功能单元划分、功能单元分析、功能单元故障建模、部件级故障建模、正常模型仿真与故障模型仿真结果对比6个步骤完成。最后以电动伺服系统的功率驱动器为例详细说明了功能单元故障模型建立过程。结果表明，所提出的故障建模方法便于操作且具有普遍的适用性。%A new fault model construction method based on simulator model was presented in this paper. Six steps of this method are as follows:simulator model construction, functional element definition, functional element analy-sis, fault model of functional element construction, fault model of parts construction, simulation. Functional element was considered as the basic unit when constructing fault models. An example about the power supply circuit of the control actuator was illustrated in Fig 5. The fault model construction method presented in this paper, we be-lieve, is easy to operate and is applicable to other cases.