两栖车液压系统及其故障诊断搜索策略研究

为提高两栖车的水陆行走性能，设计出采用闭式回路的液压驱动系统并针对其结构组成、信息传递复杂、故障多发等特点，以“泵发动机憋停”故障诊断为例，利用故障树分析并综合考虑故障诊断中的搜索成本、故障概率等因素求解出两栖车液压系统故障搜索序列。克服了单纯采用故障树分析法在故障搜索时效率低的问题，提高了液压系统故障诊断的快速性和准确性，实现了故障诊断的优化，保障了两栖车液压系统的可靠性。

Hydraulic System of the Amphibious Vehicle and Its Fault Diagnosis Search Strategy

In order to improve the performance of amphibious vehicle both on land and in water,the hydraulic drive system with closed loop was accomplished.In accordance with complex structure and information transmission and more faults of the hydraulic system,fault diagnosis of "shutdown of pump-engine" is taken as a practical example,and an optimal search strategy is found by using fault tree analysis(FTA) method and considering simultaneously search cost and fault probability.This approach proposed overcomes the insufficiency of FTA in searching faults,and rapidity and accuracy of fault diagnosis are improved.As a result,the optimal searching of hydraulic system fault diagnosis is realized and system reliability is ensured.