This paper presents a new non-linear fatigue damage accumulation model based on continuum damage *** proposed model has been formulated to take into account the damage evolution of material under different loading lev...
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ISBN:
(纸本)9781467307864
This paper presents a new non-linear fatigue damage accumulation model based on continuum damage *** proposed model has been formulated to take into account the damage evolution of material under different loading levels and the effects of loading sequence on fatigue *** additional,the model has also considered the mean stress in its damage evolution with fewer *** data of 30NiCrMoV12 under two-stress level loading in literature were used to verify the proposed *** fatigue lives using the proposed model show a good agreement with reported experimental data.
In this research,a stress-strength interference model is developed based on bi-variant Lagrange factor polynomial *** first discrete random variable is the independent *** stress-dependent strength is represented by t...
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In this research,a stress-strength interference model is developed based on bi-variant Lagrange factor polynomial *** first discrete random variable is the independent *** stress-dependent strength is represented by the second discrete random variable that has different conditional probability mean functions depending on different stress *** the approach is used to generate the bi-variant stress-strength interference *** this model the thermal strength probability mean function is Rayleigh distributed,while the thermal stress probability mean function is Normal *** of this method is investigated by specific aeroengine combustion cylinder.
Taking account of the influence of common cause failure (CCF) to system reliability,a method for reliability modeling and assessment of a multi-state system with common cause failure based on Bayesian Network (BN) is ...
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ISBN:
(纸本)9781467307864
Taking account of the influence of common cause failure (CCF) to system reliability,a method for reliability modeling and assessment of a multi-state system with common cause failure based on Bayesian Network (BN) is proposed by using the advantage of uncertainty reasoning and figurative expression of *** model is applied to a two-axis positioning mechanism transmission system to demonstrate its effectiveness and ability to directly calculate the system reliability on the basis of multi-state probabilities of *** comparison between the proposed method and the method without considering CCF verifies the efficiency and accuracy of the proposed method.
Reliability design of an aeroengine burner inner-liner is carried out using a bi-variant Lagrange factor polynomial *** stress-dependent strength is represented by a discrete random variable that has different conditi...
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Reliability design of an aeroengine burner inner-liner is carried out using a bi-variant Lagrange factor polynomial *** stress-dependent strength is represented by a discrete random variable that has different conditional probability mean functions under different thermal stress *** the LFP technique is developed to generate the stress-strength interference model with thermal stressdependent *** reliabilities are computed under three operation modes of the *** the structural reliability using GH3039 alloy is much higher than that using GH3030 alloy,it is selected in the part design of the burner inner-liner.
Failure Mode,Effecte and Criticality Analysis (FMECA) is used widely in engineering practices such as aerospace,medical facilities,naval vessels and shipping,which improves the reliability and safety of the products *...
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Failure Mode,Effecte and Criticality Analysis (FMECA) is used widely in engineering practices such as aerospace,medical facilities,naval vessels and shipping,which improves the reliability and safety of the products *** can eliminate potential failures,errors and problems from design,system and *** overcome the drawback in the traditional Risk Priority Number (RPN) [1],Gargama,*** a model based on the combination DM (Degree of Match) and fuzzy rule-base employing fuzzy logic method [2].Consider the situation that the different expert may has different opinions and knowledge backgrounds,they will give different *** to the incomplete information,less data and various uncertainties,three traditional risk factors O (Occurrence),S (Severity) and D (Detectability) can be treated as fuzzy numbers,therefore,the fuzzy linguistic terms provides a very appropriate way for modeling this *** degree of matching is used to estimate the matching between the experimental team members'assessed information and the fuzzy number by transformation the assessed information into convex normalized fuzzy *** engineering example,flight control system (FCS) in unmanned vehicle,is presented to demonstrate the proposed fuzzy FMECA *** illustrated example has shown that the proposed method advances the reliability and safety for it can model various uncertainties effectively.
Reliability is one of the critical attributes for long life and high performance *** deal with the limitation on satellite reliability analysis confronted in the past decades,a series of papers has been published rece...
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Reliability is one of the critical attributes for long life and high performance *** deal with the limitation on satellite reliability analysis confronted in the past decades,a series of papers has been published recently by Saleh et *** these papers,thousands of Earth-orbiting satellites successfully launched between 1990 and 2008 have been *** paper extends the statistical analysis of satellite reliability based on the same *** satellite reliability is modeled using a modified Weibull extension *** parametric estimation is carried out by utilizing the nonlinear least squares ***,a comparative analysis is conducted on the fitting results of Weibull and modified Weibull extension *** results demonstrate that the modified Weibull extension distribution is more accurate and flexible in modeling the satellite reliability than the traditional Weibull *** accuracy and convenience of the modified Weibull extension distribution indicates its practical application in engineering designs.
Many engineering systems are exposed to run in load-varying *** has a significant impact on the deteriorating process of components and *** the loads optimally among components of a system can reduce the failure proba...
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Many engineering systems are exposed to run in load-varying *** has a significant impact on the deteriorating process of components and *** the loads optimally among components of a system can reduce the failure probability and prolong the system *** this paper,an approach to load distribution for multi-state systems under selective maintenance strategy is *** addition to optimally allocating the limited maintenance budget among components,the proposed method also provides a feasible way to distribute loads imposed on components so as to maximize the probability of system successfully completing the next *** resulting optimization problem is solved by the genetic algorithm (GA).As observed from our comparative study,the proposed method always yields a better result that the existing method which doesn’t take load distribution into account.
engineering experience reminds us of the importance of uncertainty analysis in fatigue reliability based *** the present paper,according to the procedure of fatigue reliability analysis,parameter uncertainty and model...
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ISBN:
(纸本)9781467307864
engineering experience reminds us of the importance of uncertainty analysis in fatigue reliability based *** the present paper,according to the procedure of fatigue reliability analysis,parameter uncertainty and model uncertainty are studied and the corresponding solutions are *** aim of parameter uncertainty analysis is to obtain reliability index to quantify uncertainties imported by *** current research focuses on defining reliability index and putting forward different methods to handle different variable expressions (random,convex,fuzzy set).Different from parameter uncertainty analysis,model uncertainty analysis can reduce uncertainties imported by model by modifying model structure or selecting best *** application,both methods can effectively quantify and reduce *** development on both methods will contribute to understanding fatigue process and its causes.
Knowledge-based diagnostic approaches are usually restricted to known systems because of the nature of knowledge representation in terms of empirical symptom-failure ***-based diagnosis methods to the expert systems o...
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ISBN:
(纸本)9781467307864
Knowledge-based diagnostic approaches are usually restricted to known systems because of the nature of knowledge representation in terms of empirical symptom-failure ***-based diagnosis methods to the expert systems offer substantial advantages in terms of flexibility and potentials of knowledge *** paper describes a modeling method and diagnosis technique for the power system of the satellite using model-based diagnostic *** terms of the structure and behavior of the satellite power system,this paper focuses on building the power system model in a component-based modeling manner,which can achieve the reusability of the existed components and the scalability of system *** component in the model contains the relations between input and output,running states,and transitions between *** on the power system model are performed using simulation data to verify the correctness and effectiveness of the model and modeling method.
The similar character of input video image can be generated by combining each components points after extracting the position of each component points using the ratio of face. By selecting the face area, in case of th...
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