Understanding rare safety and reliability events using forward-flux sampling
Understanding rare safety and reliability events using forward-flux sampling
复制标题
使用前向通量采样了解罕见的安全性和可靠性事件
DOI:
10.1016/j.compchemeng.2021.107387
复制
发表时间:
2021
影响因子:
4.3
通讯作者:
Arbogast, Jeffery E.
中科院分区:
文献类型:
--
作者:
Sudarshan, Vikram;Seider, Warren D.;Patel, Amish J.;Arbogast, Jeffery E.
This paper presents improvements upon methods that explore process trajectories leading to rare safety and reliability events. It applies the forward-flux sampling (FFS) method from the family of sampling algorithms developed to discover rare molecular dynamics pathways. For a relatively simple, dynamic exothermic CSTR model with noisy feed concentration, it shows how to apply the FFS algorithm to simulate and analyze rare trajectories between high-and low-conversion steady states. First, it compares results with a less efficient brute-force (BF) method, and then with a transition-path sampling (TPS) method. The effects of varying key process parameters; ie, the residence time, τ, noise variance, σ η 2, and the controller gain, K C, which impact the rareness of an event, are investigated. Rates of rare-path transition between high-and low-conversion steady states, forward and backward, are shown to exhibit equilibrium ratios independent of σ η 2, with the forward rates decreasing with τ and K C, and the backward rates increasing with K C, whereas both increase with σ η 2. These unanticipated relationships should lead to improved alarm notifications being developed in this research work.
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DOI:
--
发表时间:
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期刊:
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