某型惯性测量组合故障传播机理与建模分析

Mechanism and Modeling Analysis of Inertial Measurement Unit Failure Propagation

惯性测量组合(IMU)是航空机电控制系统中的关键部件,其易发生故障,且故障会在各功能单元之间进行传播。IMU中存在着故障传播路径复杂多样性和故障传播不确定性的问题,这两个问题使IMU中的故障传播过程难以描述。针对该问题,在对某型IMU故障传播机理进行分析的基础上,提出了一种将多信号流图与故障扩散强度函数相结合的模型构建方法,并利用自行开发的软件建立基于故障扩散强度函数的多信号流模型,最后用试验验证了模型的准确性。研究结果表明:利用自行开发的软件所构建的故障传播模型能够有效地解决IMU中故障传播过程难以描述的问题,为保障航空安全奠定理论基础。

The inertial measurement unit(IMU)is a key component in the aviation electromechanical control system,which is prone to failure,and the failure will propagate between the functional units.There are problems of complex and diversified fault propagation paths and uncertainty of fault propagation in IMU.These two problems make it difficult to describe the fault propagation process in IMU.In response to these problems,based on the analysis of the failure propagation mechanism of a certain type of IMU,a model construction method that combines the multi-signal flow graph and the failure diffusion intensity function is proposed,and a multi signal flow model based on fault diffusion intensity function is established by using the self-developed software.Finally,the accuracy of the model is verified by experiments.The research results show that the fault propagation model constructed by the self-developed software can effectively solve the problem that the fault propagation process is difficult to describe in the IMU,and lay a theoretical foundation for ensuring aviation safety.