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It is crucial to evaluate reliability of the electrohydraulic servo valve (EHSV) which has been widely used in many fields. This paper firstly presents the physical structure and functional principle of EHSV. The Failure Mode, Effects and Criticality Analysis (FMECA) is conducted afterwards. Lastly, a method that can quantitatively analyze reliability and failure rate of EHSV suffering common cause...
Besides the Wiener and Gamma processes, the inverse Gaussian (IG) process is recently proposed as an attractive yet flexible family for degradation modeling. Since degradation test depends heavily on the degradation model chosen for a product's degradation process, we discuss the optimal design for degradation tests specifically based on the IG process. Other than an optimal design with pre-estimated...
With the development of science and technology, the engineering equipment and products are becoming more and more complicated. So, the system reliability has attracted great attention of Scholars and engineers. Because the system reliability is mainly subjected to Weibull distribution, it is important to improve the Weibull model. A new method is proposed in this paper, which can improve calculation...
By collecting the data from thermal cycling test of an lead-free BGA interconnection structure, using type-I interval censored data processing method and modified Emgelmaier fatigue life model, the cycles to failure of lead-free solder joint are predicted. The comparison between the results obtained by proposed methods and the life calculated by Matlab verifies the practicability and effectiveness...
According to the necessity of reliability analysis for satellite system subjected to common-cause failures, the unreliability expression under a variety of common-cause condition is developed to analyze the unreliability of satellite system in this paper. Based on static fault tree analysis of satellite system, the binary decision diagram is used to evaluate the reliability considering common-cause...
Reliability is one of the critical attributes for long life and high performance satellite. To deal with the limitation on satellite reliability analysis confronted in the past decades, a series of papers has been published recently by Saleh et al. In these papers, thousands of Earth-orbiting satellites successfully launched between 1990 and 2008 have been analyzed. This paper extends the statistical...
In this paper, we propose a practical method to estimate the milling head reliability based on the accelerated degradation test and Bayesian lifetime analysis method. By carefully analyzing the failure mechanism of the milling head, we adopt the accelerated degradation test to identify and parameterize the failure law of this component. The equivalent lifetime for the Bayesian lifetime analysis is...
Taking account of the fuzziness associated with failure probability of hydraulic systems, a fuzzy fault tree is proposed in the paper by integrating the fuzzy set theory into the conventional fault tree analysis method. The triangular fuzzy numbers are utilized to qualify the fuzzy uncertainty of basic events in the construction of fuzzy fault tree. Moreover, the fuzzy importance measure of each basic...
The machine tool has been widely used in the manufascturing industry. For the manufacture tool, the performance of its spindle should be guaranteed. In this paper, reliability-based design (RBD) method of a spindle using the mixture of prediction models based on random and interval variables is proposed. Being lack of sufficient data, interval variable is adopted to describe the actual condition of...
Weibull distribution has been widely used in practical reliability engineering due to its flexibility of capturing various characteristics of failure data and trend. Many methods have been introduced to deal with the parameters estimation of Weibull distribution. In this paper, Bayesian method integrated with the probability encoding method is proposed to estimate the unknown parameters of Weibull...
The performance degradation data can provide useful information about the reliability assessment for highly reliable and long-lifetime products. Existing system-level degradation tests may encounter many difficulties in degradation model building and the test might be difficult to carry out. This paper introduces the concept “State value”, presents a system performance degradation state estimation...
Reliability estimation for high reliability, long-life complex satellite system has been recognized as a critical and difficult mission for satellite reliability engineer. The information for satellite reliability estimation is insufficient at the system level. The available information is at various levels of the system in different types such as the pass/fail data, lifetime data, degradation data,...
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