Requirements for the Certification of Safety Critical Railway Systems

2001 ◽  
pp. 225-240
Author(s):  
Tomislav Lovrić
Keyword(s):  
Safety Critical ◽  
Railway Systems

Characteristics for Performance Optimization of Safety-Critical System Development (SCSD)

2020 ◽  
Vol 24 (2) ◽  
pp. 232-242
Author(s):  
Abdulaziz Ahmed Thawaba ◽  
Azizul Azhar Ramli ◽  
Mohd. Farhan Md. Fudzee ◽  
Junzo Wadata ◽  
◽  
...  
Keyword(s):  
Flight Control ◽  
Performance Optimization ◽  
System Development ◽  
Critical Systems ◽  
Critical System ◽  
Safety Critical ◽  
Railway Systems ◽  
Safety Critical System ◽  
Nuclear Systems ◽  
Causes Of Failure

Safety-critical systems (SCS) are the most significant systems that affect our daily life in many areas such as flight control systems, railway systems, medical devices, nuclear systems, and military weapons. SCS failures could result in losing life or serious injuries. Improving the practices during development phases of SCS can reduce failures up to 40%, thus resulting developers to follows specific development practices and techniques. Developers should improve safety-critical system development (SCSD) by taking into account all factors and understanding the causes of failure. Previous studies have highlighted the causes of failure during the development of SCS, but for specific areas such as designs, requirements, or the human factor, while developers need to know the causes of failure in all areas and the relationship between them clearly and comprehensively. This research aims to analyze SCSD characteristics and discuss performance improvement as well as causes of failure. This paper proposed a guideline that helps developers reduce the causes of failure during SCS development. This guide has four characteristics, each with a role in improving SCSD and reducing causes of failure.

Case study: Prediction and field tests of railway noise and effects of a low-height noise barrier

2020 ◽  
Vol 68 (4) ◽  
pp. 303-314
Author(s):  
Yuna Park ◽  
Hyo-In Koh ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
...  
Keyword(s):  
High Speed ◽  
Field Tests ◽  
Residential Areas ◽  
Railway Systems ◽  
Railway Noise ◽  
Sound Levels ◽  
Noise Barrier ◽  
The Difference ◽  
Reduction Effect ◽  
The Impact

Railway noise is calculated to predict the impact of new or reconstructed railway tracks on nearby residential areas. The results are used to prepare adequate counter- measures, and the calculation results are directly related to the cost of the action plans. The calculated values were used to produce noise maps for each area of inter- est. The Schall 03 2012 is one of the most frequently used methods for the production of noise maps. The latest version was released in 2012 and uses various input para- meters associated with the latest rail vehicles and track systems in Germany. This version has not been sufficiently used in South Korea, and there is a lack of standard guidelines and a precise manual for Korean railway systems. Thus, it is not clear what input parameters will match specific local cases. This study investigates the modeling procedure for Korean railway systems and the differences between calcu- lated railway sound levels and measured values obtained using the Schall 03 2012 model. Depending on the location of sound receivers, the difference between the cal- culated and measured values was within approximately 4 dB for various train types. In the case of high-speed trains, the value was approximately 7 dB. A noise-reducing measure was also modeled. The noise reduction effect of a low-height noise barrier system was predicted and evaluated for operating railway sites within the frame- work of a national research project in Korea. The comparison of calculated and measured values showed differences within 2.5 dB.

Generation of testing script based on XML for safety-critical systems

2011 ◽  
Vol 31 (1) ◽  
pp. 281-285
Author(s):  
Huan HE ◽  
Zhong-wei XU ◽  
Gang YU ◽  
Shi-yu YANG
Keyword(s):  
Critical Systems ◽  
Safety Critical ◽  
Safety Critical Systems
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