A safety assessment framework of control systems according to international standards
A safety assessment framework of control systems according to international standards
复制标题
根据国际标准的控制系统安全评估框架
DOI：
10.1002/asjc.2131
复制
发表时间：
2019
影响因子：
2.4
通讯作者：
N. Sebe
中科院分区：
文献类型：
--
作者：
K. Suyama;N. Sebe
在本文中，我们提出了一个评估框架的安全功能实现在一个控制器根据国际安全标准。这种功能可以最大限度地防止控制系统中的物理值偏离正常工作范围的事件。因此，它可以减少外部实施安全相关系统的需求发生频率，并补充国际安全标准（如IEC 61508）所要求的风险降低。在提出的框架中，通过使用开关L2增益分析不可预测系统切换后瞬态响应的波动，评估由于故障/恢复的真实影响而发生偏差的可能性，我们可以获得需求频率作为评估结果。
In this paper, we propose an assessment framework for the safety function implemented in a controller according to international standards on safety. Such a function can prevent events where physical values in a control system deviate from the normal operating range, to the fullest extent possible. Therefore, it can decrease the frequency of demand occurrences on externally implemented safety‐related systems and supplement them in risk reduction required by the international standards on safety, such as IEC 61508. In the proposed framework, by evaluating the possibility that the deviations occur because of the true effects of a failure/restoration by using the switching L2 gain for analyzing the fluctuations in transient responses after an unpredictable system switch, we can obtain the demand frequency as an assessment result.