Abstract
Due to the complex mechanical structure and control process of escalator emergency braking systems (EEBS), traditional hazard analysis based on the event chain model have limitations in exploring component interaction failure in such a complex social-technical system. Therefore, a hazard analysis framework is proposed in this paper for hazard analysis of complex electromechanical systems based on system-theoretic accident model and process (STAMP). Firstly, basic principles of STAMP are introduced and comparison with other hazard analysis methods is conducted, then the safety analysis framework is proposed. Secondly, a study case is performed to identify unsafe control actions of EEBS from control structures, and a specific control diagram is organized to recognize potential example casual scenarios. Next, comparison between fault tree analysis and STAMP for escalator’s overturned accident shows that hazards related to component damaged can be identified by both, while hazards that focus on components interaction can only be identified by STAMP. Besides, single control way and tandem operation process are found to be the obvious causal factors of accidents. Finally, some improvement measures like decibel detection or vibration monitoring of key components are suggested to help the current broken chain detection to trigger the anti-reversal device for a better safe EEBS.
Highlights
Escalators, as an important part of modern life, plays a more and more significant role in our life.In China, the number of elevators and escalators continues to grow every year, and the growth rate ranks first in the world
System theoretic accident model and process is illustrated and comparison between fault tree analysis (FTA), failure mode effects and criticality analysis (FMECA), HAZOP and system-theoretic process analysis (STPA) are carried out to shows the superiority of system theoretic accident model and processes (STAMP) in complex social-technical system, a safety analysis framework is proposed in this paper for hazard analysis of complex electromechanical system based on systemtheoretic accident model and process
STPA is introduced in the the escalator emergency braking system to demonstrate the superiority of the method in a complex escalator emergency braking system to demonstrate the superiority of the method in a complex social-technical system
Summary
Escalators, as an important part of modern life, plays a more and more significant role in our life. On the base of STAMP, system-theoretic process analysis (STPA) was proposed to constraints of traditional event chain model [20,21,22,23]. System theoretic accident model and process is illustrated and comparison between FTA, failure mode effects and criticality analysis (FMECA), HAZOP and STPA are carried out to shows the superiority of STAMP in complex social-technical system, a safety analysis framework is proposed in this paper for hazard analysis of complex electromechanical system based on systemtheoretic accident model and process. The main causes of safety issues in the new theory are component failures, system external disturbances, interactions between components, and component behaviors that lead to dangerous system states
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