Link Between Function-Flow Failure Rates and Failure Modes for Early Design Stage Reliability Analysis
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This scope of this paper is to provide an extension to the Function Failure Design Method (FFDM). We first implement a more robust knowledge base using Failure Mode/Mechanism Distributions 1997 (FMD-97). Then failure rates from Nonelectric Parts Reliability Data (NPRD-95) are added to more effectively determine the likelihood that a failure mode will occur. The proposed Functional Failure Rate Design Method (FFRDM) uses functional inputs to effectively offer recommendations to mitigate failure modes that have a high likelihood of occurrence. This work uses a past example where FFDM and Failure Modes and Effects Analysis (FMEA) were compared to show that improvements have been made. A four step process is presented to show how the FFRDM is used during conceptual design.Keywords:
Scope (computer science)
The reliability of electromechanical system is one of the key problems to restrict the rapid development of electromechanical system. Based on traditional reliability analysis methods, the degradation failure modes of electromechanical system are investigated, the reliability modeling analysis method based on competing mode of hard and soft failure is presented. The relations between reliability, failure rate, MTBF and failure threshold are analyzed by this method. The results can help to optimize electromechanical system design.
Mode (computer interface)
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In PoF based reliability prediction method,FMMEA is firstly introduced to get the failure mode,mechanism and failure physics models. Performance parameters such as material,structure,technology and stress are used to found the simulation model. Some data are acquired by stress analysis and then PPoF models are used to carry out damage analysis,from which a great amount of TTF samples under single point and single failure mechanism are achieved. Reliability parameters like failure rate and MTBF can be computed through fusing of TTF data. Reliability prediction of a single board computer is given as an example of the failure simulation method. This method links reliability with structure,material and stress of a product,which will assist finding the weakest point of a product and adopting effective measures. This method is a supplement to statistics data based reliability prediction method.
Physics of failure
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This paper describes research results on reliability test plans and failure analyses for relay. The focus subjects studied in this paper are about electronic static measuring relay and small control relay. The paper discusses the failure mode and failure mechanism for relay in detail, and provide necessary measures on failure prevention. For the purpose of describing the reliability of relay quantitatively, the authors provide the reliability parameter on basis of analyses for above two kinds of relay. For electronic static measuring relay, MTTF and success ratio are suggested to be reliability parameter. For small control relay, the failure rate is suggested to be the reliability parameter. At last, the paper discusses the reliability test plans and test procedures.
Test plan
Digital protective relay
Solid-state relay
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The reliability prediction model for domestic MMICs is presented based on analyzing the failure mode and mechanism.By the accelerated life teat,the MMIC′s basic failure rate and the temperature factor πT are obtained.Based on a great deal of processing data and literature,the other factors of the model are obtained also.
Failure mechanism
Physics of failure
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When developing aero-engines, problems with respect to reliability maybe come because of designs, but the manufacture process causes a lot. The purpose to study the process reliability is to cut down and eliminate the process defects/failures, which will improve the pass rate. This paper puts forward the concept, evaluations, and the contents of process reliability, and method to analyze process reliability. In addition, a case will be used to certificate this analysis.
Certificate
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The RBD for the 'total failure' mode in a newly-designed system is likely to be a series connection of subsystems each of which consists of a series of units and modules. The overall failure rate must be divided between the subsystems, and preliminary predictions made to assess whether or not the system is likely to meet its reliability target; reliability allocation methods are described in Chapter 16. RBDs for other failure modes (if they are highly critical) may also have to be constructed. In cases where the preliminary designs seem unlikely to meet the specification, then methods of increasing system reliability must be sought.
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The increasing complex nature of technology makes reliability becoming the key factor of the quality and economic effect of apparatus. But common methods used abroad to improve reliability e.g. reliability test, environment test, failure mode analysis are too costly for most pur corporations. The concept Independent Failure statistic analysis is suggested and the principle and application are also indtouced.
Statistic
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Abstract This paper presents an extension of reliability analysis of electronic devices with multiple competing failure modes involving performance aging degradation. The probability that a product fails on a specific mode is derived. Using this probability, the dominant failure mode on the product can be predicted. A practical example is presented to analyze an electronic device with two kinds of major failure modes–solder/Cu pad interface fracture (a catastrophic failure) and light intensity degradation (a degradation failure). Reliability modeling of an individual failure mode and device reliability analysis is presented and results are discussed. Copyright © 2003 John Wiley & Sons, Ltd.
Degradation
Physics of failure
Mode (computer interface)
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This Paper enlightens the significance of the reliability evaluation for an electrical power distribution network using the analytical technique FMEA. The power distribution system is subject to interruptions frequently as a lot of devices are responsible for its effective operation. All the possible failures of each component are considered and the reliability is evaluated in terms of system reliability indices like SAIFI, SAIDI, ENS, and ASAI. FMEA method observes the failure modes of a procedure and reduces it by ranking over its impacts. In this paper, RBTS bus2 distribution network is used for the analysis. The influences of various feeder reconfigurations are considered and the system reliability indices are obtained. The obtained results show that the reliability of the distribution system is enriched with various feeder reconfigurations. Reliability Evaluation helps to design the future Distribution system and its expansion.
Component (thermodynamics)
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This paper presents a method for project optimum scheme with the use of reliability qualitative analysis which analyzes the options of a project from the view of reliability. According to the results of reliability model, failure mode and effect analysis (FMEA) and failure tree analysis (FTA), the optimum scheme can be obtained with the contrast of reliability, the number of faults, the number of single point failures and the minimal cut set. Finally, this paper proves the feasibility of this method via an example of power supply and distribution system of XXX instrument.
Reliability theory
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