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In the future intelligent transport systems (ITS) the reliability and precision of the cooperative and autonomous vehicles are of the utmost importance. For such systems vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communications is safety-critical component of ITS. Many mobility and convenience applications of ITS require the V2X bidirectional communications mode. This paper focuses on...
Failure analysis is an important part in reliability analysis, while the traditional FMEA method could not analyze system with complex physical structure and functional logic by tables. Based on the Altarica language, this paper presents a method of product fault modeling and analysis for complex system. Then give examples of cold/warm backup system and reconfiguration system to verify the accuracy...
The paper is devoted to the climate influence on the safety of a critical infrastructure defined as a complex system in its operating environment that in the case of its degradation have significant destructive influence on the health, safety and security, economics and social conditions of large human communities and territory areas. The method based on the joint model linking a multistate approach...
Safety is one of the main guidelines for critical systems design. Designers are in charge of developing architectures that comply with the safety requirements. Thus they must ensure that qualitative safety indicators such as the minimal size of failures scenario leading to a failure condition fc and quantitative indicators such as the probability to reach fc after a certain time interval, are kept...
The Threshold voltage variability is increasing due to the process variability and reliability issues. SRAM cell stability dependence with threshold voltage is analyzed in order to extract reliability degradation due to BTI-induced Vth drift. The several write margin definitions are selected and their feasibility to be implemented in a threshold voltage built-in sensor is analyzed. The writability...
This paper presents an approach for safety assessment in unmanned aerial system (UAS) operations that uses stochastic fast-time simulation and selected published ground impact fatality/casualty models to calculate fatality risk. The application of simulation allows a sensitivity analysis measuring how different aspects and phases of a UAS operation impact the risk calculations for each of the ground...
In this paper, the characteristics of the kinetic reliability of space four-links mechanism are analyzed and the relationship between the kinetic accuracy and wear clearances in joints is explored, using Advanced First Order and Second Moment (AFOSM) method and Monte-Carlo Simulation (MCS). The Archard wear model is applied to analyze the increasing wear clearances in joints; and the function between...
10kV cross-linked polyethylene (XLPE) cables are widely used in power system because of its advantages of small external influence factors and high reliability and safety. However, cable accessories are weak links of the cable lines. Considering the hot and humid environment in Guangzhou areas, the applicability of cold and hot shrinkable cable accessories is questionable. This paper has carried out...
Vehicle platooning using reliable wireless communication between the member vehicles is a promising method to increase road capacity, lower fuel consumption, and improve safety and driver comfort. IEEE 802.11p is a key communication technology in Vehicular Ad-hoc Networks (VANETs) for Intelligent Transport System (ITS) applications. The broadcasted awareness messages in the wireless communication...
Basic safety message(BSM) or heartbeat message is periodically broadcast by each vehicle on the road, conveying vehicle's instantaneous position and driving state. The vehicular communication network enables the fast exchange of BSMs with neighboring vehicles which assists drivers in acquiring the local driving environment and maneuvering promptly in case of any potential hazard. Such message is exceptionally...
This paper presents a human reliability analysis method based on cognitive process model. Human cognitive processes are modelled in different forms under different risk scenarios respectively. The cognitive process model consists of an event tree based on human cognitive process and Bayesian networks modelling the cognitive phases. The Bayesian networks (combining with evidence theory) use hierarchical...
This paper based on the theory of reliability centered maintenance (RCM) techniques aimed to verify the analysis results obtained by GO-Bayes method. This paper addresses the problem of establishing Monte Carlo simulation model to simulate the braking system. Metro vehicle braking system has been selected as it is one of the most complex and high-technology systems among all devices of train vehicles...
The paper aims to present an improved methodology of safety assessment with system simulation. In this paper, the Monte Carlo simulation and uncertainty analysis will be applied to the research of FMECA which is the basis of safety assessment. The improved methodology will overcome the shortages of traditional method. At the same time, the idea of the method will provide a comprehensive safety analysis...
Cooperative intelligent transport systems (ITS) are considered as the key enabling technology to improve road safety, traffic efficiency and driving experience. V2X (vehicle-to-vehicle and vehicle-to-infrastructure) communications are gaining increasing importance in automotive research and engineering domains. Many mobility and convenience applications require the V2X bidirectional communications...
Failure Mode and Effects Analysis (FMEA) is a well-known technique for evaluating the effects of potential failure modes of components of a system. It is a crucial reliability and safety engineering activity for critical systems requiring systematic inductive reasoning from postulated component failures. We present an approach based on SysML and Prolog to support the tasks of an FMEA analyst. SysML...
In this paper, we propose a reliable dual-radio based DSRC channel assignment scheme and a new application- level based receiver-oriented repetition (AROR) scheme for one-hop event-driven emergency message broadcast in vehicular ad hoc networks (VANETs). The new scheme takes advantage of DSRC dual-radio devices to provide preemptive access for one-hop event-driven safety services without conflicts...
The knowledge of a historical masonry building is a prerequisite both for the purposes of a reliable evaluation of the actual seismic safety and for the choice of an effective intervention for the preservation of the monumental building. It is therefore a need to refine the investigations and techniques of analysis by different degree of reliability, as well as in relation to their impact. Knowledge...
Human reliability is considered as the predominant causation factor in maritime accidents. The previous researches on human reliability analysis are reviewed in this paper, although these works have benefited us a lot in accident prevention, few researches focused on the human reliability in the developing stages of maritime accident process. This paper first thoroughly reviews the existing sequential...
The main task of this study is the development of diagnostics techniques in order to achieve both corrective and predictive maintenance methods. The use of simulation tools can drastically increase speed, efficiency and reliability in the design process of safety critical systems. For these reasons, a dedicated tool named TTH Lib was developed and customized for lube oil plants simulation. The proposed...
This paper focuses on the reliability simulation of a space TWT. We do thermal simulation and thermal stress simulation of the overall tube; give the TWT internal temperature distribution and thermal expansion displacement. We have a overall tube of random vibration simulation on the basis of the modal simulation. The simulation results are expected to be used as the basis for product reliability.
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