Papers by Keyword: Failure Mode

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Authors: Shu Zhong Zhang, Qin Da Zeng, Gong Zhang
Abstract: The traditional failure mode, effect, and criticality analysis (FMECA) uses risk priority number (RPN) to evaluate the risk level of a failure mode. The RPN index is calculated by multiplication of severity, occurrence and detection factors. The most critically debated disadvantage of this approach is that various combinations of these three factors may produce an identical value of RPN. This paper reviews the drawbacks in traditional FMECA and proposes a new approach to overcome these shortcomings. The proposed approach evaluates risk of failure mode by encouragement-variable-weighted analytic hierarchy process (EVW-AHP) that can prioritize failure modes even if two or more failure modes have same RPN. An example is provided to show the potential applications of the proposed approach and the detailed computational process is presented. The results based on the case study show the proposed new methodology solves the limitations of traditional FMECA approach and is feasible.
Authors: Ding Li
Abstract: To reduce product costs and improve the competitiveness of a enterprise, it is essential to optimize and manage the production processing in an efficient way. However, in many large-scale enterprises, the supervision and optimization of production processing is very complex and effective regularization is often difficult to achieve. To address this issue, a new method is proposed to optimize the production processing in large-scale enterprises in this work. The innovation of the proposed method lies on that it is the first time to use the integration of failure mode and effects analysis (FMEA) and evolution game analysis to deal with the issue of production processing optimization. The FMEA was firstly used to reveal the critical factors on the production processing optimization and the evolution game analysis was then applied to finding efficient/inefficient correlated equilibria in the optimization processing. A case study has been carried out in a company to evaluate and verify the new method. The actual situation has been taken into account for the practice evaluation of the proposed method. The analysis results show that the proposed method provides good production processing optimization and hence is feasible and easy to use in practice.
Authors: Yan Jun Pang, Qing Hao Wang, Chuan Bo Liu, Xiao Liu, Tian Shi Wang
Abstract: In order to improve the reliability evaluation to the distribution network, uncertainty factors about aging of components are considered under conventional reliability analysis of distribution system in the paper. The relationship between unavailability of aging of components and time (or limit age of components) is analyzed. Then the reliability indices are calculated by FMEA (Failure Mode and Effect Analysis). Finally distribution network reliability level is distinguished and the measures on improving the power distribution system reliability are presented.
Authors: Fu Long Liu, Xiao Cong He, Lun Zhao
Abstract: Clinching is a high-speed mechanical fastening technique for point joining of sheet material. In order to investigate the influence of material property on the mechanical property and failure mode of clinched joints, three types of clinched joints in aluminum alloy sheet were tested under tension-shear loading with MTS landmark, separately. Results showed that the property of the substrate had effective on the performance of clinched joints. Clinched joints had higher strength and good energy absorption capacity when the strength of the substrate was higher. The strength and energy absorption capacity of the clinched joints were evaluated via load-displacement curves. While the failure modes of clinched joints were all the same: neck facture failure.
Authors: Fu Long Liu, Xiao Cong He, Yu Qi Wang
Abstract: This paper studied the performance of self-piercing riveting (SPR) and adhesive hybrid joints of different adhesive, including strength, capacity of energy absorption, failure mode and failure mechanism of the hybrid joints. The performances of SPR-adhesive hybrid joints were compared with SPR joints. SPR-adhesive hybrid joints and SPR joints were tested under a tension loading. The test results showed that adhesive have a function of improving the strength of SPR joints; however, the capacity of energy absorption of SPR joints was weakened. While the adhesive have no effect on the failure modes of SPR joints. When appropriate adhesive was selected, the overall performance of SPR-adhesive hybrid joints was superior to SPR joints. In a word, the combination of SPR and adhesive could get a well jointing structure.
Authors: Iwona Paprocka, Wojciech M. Kempa, Krzysztof Kalinowski, Cezary Grabowik
Abstract: In the paper, a production model with maintenance is presented. Successive failure-free times of a bottleneck are supposed to have predefined distributions and are followed by distributed times of repair. Having values of parameters: Mean Time To Failure and Mean Time of Repair, a predictive schedule is generated. To assess wastes due to unplanned events of the bottleneck, such as unplanned downtime the Overall Equipment Effectiveness indicator is applied. To assess failure rate of the bottleneck the Parts Per Million Opportunities indicator is applied. Prediction capability, detection capability of a failure and effects of the failure occurrence are evaluated and registered in the Exploitation Failure Mode and Effects Analysis form. The objective of the presented predictive scheduling model is to achieve: zero machines failures, zero defects, zero accidents at work.
Authors: Ying Kui Gu, Yao Gang Xiong, Xin Chong Luo
Abstract: A reliability risk assessment model based on fuzzy FMEA was presented by using fuzzy comprehensive evaluation. Fuzzy matrixes were constructed according to the investigation data, in which occurrence probability ranking, effect severity ranking and detection difficulty ranking are all weighted analyzed. A fuzzy hierarchy analysis method was used to obtain the weight of each influence factor. In the model, the potential fault modes and the reasons can be analyzed and the preventive measures can be taken in prevention stage to avoid finding the problems after the products are put into production and market. It will provide new ideas and new methods to improve the operation security of the engine, to prevent and forecast failure, and to estimate and control the risk.
Authors: Zhi Ming Lei, Zi Li Wang, Yi Ren, Lin Lin Liu
Abstract: According to the characteristics of domain knowledge,a method for the determination of domain sememe is given,and a rule for the description of the domain semantic item is also given.Then,the method and the rule are applied to the failure domain.The model of semantic force is given in the process of semantic retrieval ,and the method for the calculation of semantic force is given.The method for the generation of the theme of failure mode is given.A retrieval method for failure mode based on semantic is given,and there is an example to prove its effectiveness.
Authors: Yu Mei Wu, Lei Sun, Li Jin Wu
Abstract: Software Failure Modes and Effects Analysis (SFMEA) technology is the most common technique in reliability and safety analysis. The common software FMEA methods are summarized and for object-oriented software, combined with the Rhapsodys characteristic of modeling and simulation, we proposed the SFMEA method based on modeling and simulation by Rhapsody and gave the process of implementation, the acquisition methods of failure modes and the SFMEA example.
Authors: Yang An, Chun Hui Yang, Peter Hodgson
Abstract: In the study, the strengthening effect of aluminium foam in thin-walled aluminium tubes subject to bending load in investigated experimentally and numerically. Bending tests are conducted on foam filler, hollow tube and foam-filled tube. The finite element method is used as well to get deeper insight into the crush failure modes via focusing on the influence from wall thickness of the tube. The obtained information is useful to optimally design foam-filled tubes as energy absorbing devices in automotive engineering. The optimisation results can be implemented to find an optimum foam-filled tube that absorbs the same energy as the optimal hollow tube but with much less weight.
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