Model Based Approach To Identify Optimal System Structures and Maintenance Policies for Safety Interlocks with Time-Varying Failure Rates
Model Based Approach To Identify Optimal System Structures and Maintenance Policies for Safety Interlocks with Time-Varying Failure Rates
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基于模型的方法来确定具有时变故障率的安全联锁的最佳系统结构和维护策略
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Chuei
中科院分区：
文献类型：
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作者：
Edwin Wibisono;Vincentius Surya Kurnia Adi;Chuei
为了减轻现代化工厂中事故的不利后果，通常的做法是在危险条件下运行的流程上安装安全联锁装置。过去已经开发了通用数学规划模型，用于同时规定给定过程的最佳联锁结构和相应的维护策略。本研究通过放宽约束假设（即每个嵌入式组件的故障率是恒定的）来改进这种传统的公式。修改后的模型中并入了更真实的威布尔分布，而不是指数分布，以表征每个嵌入式组件的故障时间。因此，这种建议的做法可以促进识别更复杂的时间相关的检查计划以及警报逻辑。提供了两个例子来证明所提出方法的可行性和有效性。
In order to mitigate the detrimental outcomes of accidents in the modern chemical plants, it is a common practice to install safety interlocks on processes operated under hazardous conditions. A generic mathematical programming model has already been developed in the past for simultaneously stipulating the optimal interlock structure and the corresponding maintenance policies of a given process. This conventional formulation is improved in the present study by relaxing a constraining assumption, that is, the failure rate of every embedded component is constant. Instead of the exponential distribution, the more realistic Weibull distribution is incorporated in the modified model to characterize the time to failure of every embedded component. Consequently, this proposed practice could facilitate identification of more elaborate time-dependent inspection schedules and also alarm logics. Two examples are provided to demonstrate the feasibility and effectiveness of the proposed approach.