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A recent work conducted by the authors (Maktouf and Saï, 2015) demonstrated that the root cause of the premature blade failure was caused by high-cycle fatigue (HCF) mechanism initiated at a localized carbon-rich area inducing grain boundary brittleness. The blade was subject to multiaxial cyclic loadings during its service life and any attempt to assess component fatigue strength leads to the question...
Study on accelerated life test scheme is conducted according to the life test load spectrum of a certain type of air turbine starter. Through comparison and analysis of the failure modes and durability simulation results of the air turbine starter, the study identifies the main component failure mechanism of the air turbine starter. Based on the failure mechanism derived from analysis, and with the...
Severity levels of air pollutant rich in oxides, chlorides and sulfurs can cause severe corrosion on electronic equipment. Besides, high atmospheric concentrations of sulfur also can be found in wide variety of industries that use electronics. With the more and more severe environmental pollution, especially in regions with high pollution levels, the corrosion phenomenon will also directly or indirectly...
The demand of light, thin, short, and small chip in electronic industry has made investing considerable amount of human and material resources as to improve the chip density to match the thin structure loading specifications. Also, the general electronic configuration of traditional plastic containers can be improved by using a paste with good wettability, good dielectric properties, and inexpensive...
Recently authors have proposed damage equalization method with step-stress tests for quick estimation of life exponent of power equipment insulation. Traditional constant-stress accelerated ageing tests for insulation are disadvantageous since outliers in sample data will always be there and some samples may not fail even after a long time. Such long duration life estimation tests are a major bottleneck...
This paper focuses on statistic method under small test samples through re-sampling for aeronautics pump. Based on the limit accelerated life testing samples and regular life testing samples, this paper presents a life evaluation method combing the Synthetic Minority Over-Sampling Technique (SMOTE) algorithm, Kolmogorov-Smirnov (KS) test and accumulated damage theory. SMOTE algorithm is used to solve...
Light emitting diodes (LEDs) are commonly expected to be the future of lighting because of a high luminous efficacy, a long lifetime and a high color rendering index (CRI). Nevertheless, the performance and the reliability of an LED are strongly dependent on the LED junction temperature. This paper presents a multi-objective methodology to find the optimal forward current subject to the annualized...
Being instrumental in electric energy data collection for energy data collection and supervisory systems, the reliability of an electric energy collector not only affects the reliability of the system, but also directly influences users' satisfaction. With the objective of addressing the problem of reliability assessment of an electric energy data collector, the failure mechanism of the data collector...
The integrated operational amplifiers are widely used in the analog integrated circuits. The reliability of the devices, especially in changing temperature condition, affects the reliability of automation equipment. Accelerated test is a main method to assess electronic components' life. At present, there are some problems in parameters test systems. e.g., multiple devices can't be tested at the same...
With the rapid development of science and technology, and the continuous improvement of industrial manufacturing and reliability, the quantitative assessment of reliability and life is very important. As a kind of high-reliability and long-life product, film capacitor is widely used in communication, locomotive, and wind power generation, etc. Such a situation presents higher requirements for the...
To evaluate the life of a packaging box, accelerated life testing was conducted under multiple environmental stresses. Based on the potential failure mode and mechanism, sensitive stresses were determined in accelerated life testing. The method of events compression and increasing stress levels was used for accelerated life testing based on the life profile of packaging box. The test included an environmental...
Space relays are affected by many nonlinear elements during storage, and the reason for predicting time series is to achieve nonlinear mapping. Combining artificial neural networks and grey system theory, we built a grey artificial neural network (GANN) model. The model effectively combined the characteristics of artificial-neural-network nonlinear adaptability and the characteristics of grey theory...
A new method of Highly Accelerated Stress Screen/Life Testing (HASS/HALT) for computer keyboards is introduced and compared with User Information Investigation (UII) from manufacturer, Accelerated Life Testing (ALT), and Normal Stress Reliability Testing (NSRT). The results of the above three lab testing processes all showed good accordance trends with the data from the UII. The failure mechanism...
Environmental stress screening is an effective method to eliminate the potential defects of electronic products. In order to improve the efficiency and effectiveness of environmental stress screening, the acceleration effect was derived and analyzed based on the quantitative environmental stress screening mathematical principles of GJB/Z34. Then the high-temperature aging, temperature cycling, and...
Responsible for supplying energy to electric equipment, secondary power supply of spacecraft is the foundation for the normal operation of electric equipment. Its key status decides the high requirement for performance stability and reliability. Due to the spacecraft product characteristics like small sample, long life and high reliability, it is hard to apply traditional life evaluation methods based...
Responsible for supplying energy to electric equipment, secondary power supply of spacecraft is the foundation for the normal operation of electric equipment. Its key status decides the high requirement for performance stability and reliability. Due to the spacecraft product characteristics like small sample, long life and high reliability, it is hard to apply traditional life evaluation methods based...
Recently thermal cycling tests for train electronic assemblies have been widely applied to eliminating latent defects and improving the reliability of the electronics. Considering the cost and schedule, accelerate thermal cycling (ATC) tests are conducted instead of normal tests. In this paper, the design methodology of ATC tests for electronic assemblies is studied. Moreover, the procedure of test...
Equivalent optimum design is a new method of designing an optimum accelerated life test scheme. Traditional method is to establish a statistical model based on the corresponding life distribution and acceleration model under the premise of determining the test stress loading mode. The premise of predetermined stress loading mode results in a locally optimal solution, rather than achieving the global...
Aiming at fault detection rate (FDR) and fault isolation rate (FIR), testability demonstration technology is relatively mature. As an extension of testability technology, PHM (Prognostics and Health Management) provides a more sophisticated form to quantify and predict equipment health state and remaining useful life (RUL). Therefore, many researches attach importance to the prognostic validation...
Accelerated degradation testing (ADT) is commonly used to obtain degradation data under the hasher than normal usage conditions, and to assess lifetime and reliability for high reliable and long life products in a short time. The optimal design for ADT is to propose the test plan based on the performance degradation process with a reasonable optimal criteria and the constraints of test resources....
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