改进的基于三阶段故障过程状态检测模型

基于维修实践中设备两阶段故障过程,利用延迟时间的概念和当前时刻的状态检测历史信息,建立了改进的基于三阶段故障过程的状态检测模型。该模型更接近于设备的真实运行过程。设备运行有4种可能状态出现:正常状态、非严重缺陷状态、严重缺陷状态和故障状态。当检测到系统处于非严重缺陷状态时,采用延迟预防维修策略建立模型。以单位时间设备运行平均费用最小为决策目标,优化检测间隔和阈值时间,通过参考阈值时间来决定是否实施延迟预防维修决策。最后将提出的模型应用于实际案例中,验证了改进的基于三阶段故障过程的状态检测模型的有效性。

Improved inspection model based on a three-stage failure process

Aiming at the typical two-stage failure process of equipment in maintenance practice, an inspection model based on a two-stage failure process is designed based on the obtained condition monitoring information using the concept of delaying time. This model is a step closer to reality. There are four operation states: normal state, minor defective state, severe defective state and failure state. If the system is identified to be in the minor defective stage, two different kinds of maintenance decisions are made .The optimal intervals and threshold valve time for inspection of potential failure are determined with the minimum cost using this model. The threshold value time plays a role to decide whether to carry out the preventive maintenance action. Finally, the proposed model is applied to a practical case and the results prove the effectiveness of the model based on the delay preventive maintenance policy.