scholarly journals Hazard Analysis for Escalator Emergency Braking System via System Safety Analysis Method Based on STAMP

2019 ◽  
Vol 9 (21) ◽  
pp. 4530 ◽  
Author(s):  
Zitong Zhou ◽  
Yanyang Zi ◽  
Jinglong Chen ◽  
Tong An
Keyword(s):  
Hazard Analysis ◽  
Fault Tree Analysis ◽  
Control Process ◽  
Safety Analysis ◽  
Vibration Monitoring ◽  
Chain Model ◽  
Analysis Framework ◽  
Emergency Braking ◽  
Operation Process ◽  
Complex Electromechanical Systems

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.

scholarly journals A zonal safety analysis methodology for preliminary aircraft systems and structural design

2018 ◽  
Vol 122 (1255) ◽  
pp. 1330-1351 ◽  
Author(s):  
Z. Chen ◽  
J. P. Fielding
Keyword(s):  
Failure Modes ◽  
Hazard Analysis ◽  
Fault Tree Analysis ◽  
Cost Effective ◽  
Safety Analysis ◽  
Design Tool ◽  
Assessment Process ◽  
Design Stage ◽  
Preliminary Design

ABSTRACTZonal Safety Analysis (ZSA) is a major part of the civil aircraft safety assessment process described in Aerospace Recommended Practice 4761 (ARP4761). It considers safety effects that systems/items installed in the same zone (i.e. a defined area within the aircraft body) may have on each other. Although the ZSA may be conducted at any design stage, it would be most cost-effective to do it during preliminary design, due to the greater opportunity for influence on system and structural designs and architecture. The existing ZSA methodology of ARP4761 was analysed, but it was found to be more suitable for detail design rather than preliminary design. The authors therefore developed a methodology that would be more suitable for preliminary design and named it the Preliminary Zonal Safety Analysis (PZSA). This new methodology was verified by means of the use of a case study, based on the NASA N3-X project. Several lessons were learnt from the case study, leading to refinement of the proposed method. These lessons included focusing on the positional layout of major components for the zonal safety inspection, and using the Functional Hazard Analysis (FHA)/Fault Tree Analysis (FTA) to identify system external failure modes. The resulting PZSA needs further refinement, but should prove to be a useful design tool for the preliminary design process.

Improved Systemic Hazard Analysis Integrating with Systems Engineering Approach for Vehicle Autonomous Emergency Braking System

2021 ◽  
Author(s):  
Jianyu Duan
Keyword(s):  
System Design ◽  
Systems Theory ◽  
Systems Engineering ◽  
System Development ◽  
Process Analysis ◽  
Hazard Analysis ◽  
Safety Analysis ◽  
Critical System ◽  
Emergency Braking ◽  
Braking System

Abstract Safety analysis is a significant step for the safety-critical system development. Compared with traditional vehicles, the system interactions for autonomous vehicles are more abundant and complex. Traditional hazard analysis methods, such as Failure Mode and Effects Analysis (FMEA) and Fault Tree Analysis (FTA) which are on the basis of the component failure and reliability theory, can not identify the system hazards related to system interactions. An emerging hazard analysis method based on systems theory, Systems Theory Process Analysis (STPA) mainly focuses on identifying the control system hazards caused by system interactions. In this study, STPA method is used to identify the potential hazards and casual factors for autonomous emergency braking system by concentrating on system interactions. To improve the consistency between system design and safety analysis, the workflow combining model-based systems engineering (MBSE) and STPA is proposed. The systems modeling language (SysML) is used to describe control structure and system interaction relationships. According to the identified casual factors, the certain constraints and requirements can be derived, which can provide the guidance for system development with respect to system design. Furthermore, the quantitative analysis of the certain unsafe control action is conducted by simulation, which shows effectiveness and feasibility of the proposed method in safety analysis and system design.

Safety Analysis Model of DUCG Based on FMEA/FTA

2018 ◽  
Author(s):  
Zhenxu Zhou ◽  
Hao Nie ◽  
Chunling Dong ◽  
Qin Zhang
Keyword(s):  
Failure Modes ◽  
Fault Tree Analysis ◽  
Safety Analysis ◽  
Nuclear Industry ◽  
Analysis Model ◽  
Industrial Systems ◽  
The Past ◽  
Research Cycle ◽  
Dynamic Uncertain Causality Graph ◽  
Analytical Power

Failure Modes and Effects Analysis (FMEA) is a useful tool to find possible flaws, to reduce cost and to shorten research cycle in complex industrial systems. Fault Tree Analysis (FTA) has gained credibility over the past years, not only in nuclear industry, but also in other industries like aerospace, petrochemical, and weapon. Both FMEA and FTA are effective techniques in safety analysis, but there are still many uncertain factors in them that are not well addressed until now. This paper combines FMEA and FTA based on Dynamic Uncertain Causality Graph (DUCG) to solve this issue. Firstly, the FMEA model is mapped into a corresponding DUCG graph. Secondly, FTA model is mapped into a corresponding DUCG graph. Thirdly, combine the above DUCG graphs. Finally, users can modify the combined DUCG graph and calculations are made. This paper bridges the gap between FMEA and FTA by combining the two methods using DUCG. And additional modeling power and analytical power can be achieved with the advantages of the combined DUCG safety analysis model and its inference algorithm. This method can also promote the application of DUCG in the system reliability and safety analysis. An example is used to illustrate this method.

Safety analysis of autonomous systems by extended fault tree analysis

2007 ◽  
Vol 21 (2-3) ◽  
pp. 287-298 ◽  
Author(s):  
Jan Åslund ◽  
Jonas Biteus ◽  
Erik Frisk ◽  
Mattias Krysander ◽  
Lars Nielsen
Keyword(s):  
Autonomous Systems ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Safety Analysis ◽  
Tree Analysis

Safety Analysis and Risk Assessment for Pressure Systems

2003 ◽  
Author(s):  
Boris Blyukher
Keyword(s):  
System Analysis ◽  
Hazard Analysis ◽  
Safety Analysis ◽  
Risk Level ◽  
Analysis And Design ◽  
Analysis Process ◽  
Major Factors ◽  
Serious Injuries ◽  
And Control ◽  
Research Facilities

There have been many instances where serious injuries and fatalities have resulted from over-pressurization, thermal stress, asphyxiation and other potential hazards associated with testing, handling and storage of compressed gases and pressure facilities at numerous production and research facilities. These hazards are major issues that should be addressed in system design and in materials selection appropriate for high pressure applications. Potential hazards may be mitigated through system analysis and design process which are the major factors in preventing thermal/pressure hazards caused by possible leaks and fragmentation, in the case of rupture. This paper presents a conceptual model and framework for developing a safety analysis which will reduce potential hazards, accidents and legal liabilities. The proposed systematic approach allows to identify hazards provide timely documentation of potential hazards and risks associated with systems, facilities, and equipment. As a result of this hazard analysis process, provisions and actions for hazard prevention and control have been put in place, and all identifiable potential hazards can be reduced to a low risk level.

PECULIARITIES OF MACHINERY CONDITION VIBRATION MONITORING WITH USING THE S-DISCRIMINANTS

2020 ◽  
pp. 4-11
Author(s):  
A. G. Sokolova ◽  
F. Ya. Balitsky ◽  
V. D. Sizarev
Keyword(s):  
Condition Monitoring ◽  
Research Reactor ◽  
High Efficiency ◽  
Reference State ◽  
Vibration Monitoring ◽  
Radiation Environment ◽  
Operation Process ◽  
Operation Period ◽  
The Moment ◽  
Complete Access

The paper presents the results of the specific vibration condition monitoring approach for maintenance of unique critical equipment provided complete access impossibility to its components (due to radiation environment) throughout the entire operation period. The approach bases on the previously proposed S-discriminants of vibrations which are calculated with adaptation to the reference state of the equipment. The method showed its high efficiency in detecting the moment of machine operation process imbalance and in tracking the equipment components degradation, starting from the earliest stage. It is illustrated on the example of the movable neutron reflector PO-3 of the IBR-2 research reactor that it is possible not only to detect in time the moment when a fault occurs, but also to make a preliminary express diagnosis of its condition.

Verification of the HTR code package (HCP) as a comprehensive HTR steady state and transient safety analysis framework

2018 ◽  
Vol 329 ◽  
pp. 167-176 ◽  
Author(s):  
S. Kasselmann ◽  
A. Xhonneux ◽  
F. Tantillo ◽  
A. Trabadela ◽  
D. Lambertz ◽  
...  
Keyword(s):  
Steady State ◽  
Safety Analysis ◽  
Analysis Framework

Integrating job safety analysis into process hazard analysis

2009 ◽  
Vol 29 (3) ◽  
pp. 242-246 ◽  
Author(s):  
Robert L. Collins
Keyword(s):  
Hazard Analysis ◽  
Safety Analysis ◽  
Job Safety
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