Papers by Keyword: Reliability Design

Abstract: In this paper, the reliability and reliability sensitivity of the main shaft device of a hoist system is studied. The main purpose of this paper is to provide a modeling method for the joint probability distribution of main shaft device with coupling faults based on the system reliability theory and copula function theory. The stochastic response of the main shaft device is obtained using design of experiment. The reliability of the main shaft device is calculated based on the fourth moment method. The reliability sensitivity is then deduced based on the reliability results. The joint probability of failure between correlated failure modes is estimated based on the Gumbel copula. The system reliability evaluation of the main shaft device is then calculated. A numerical example of a main shaft device is illustrated to validate the application of the proposed method. The method proposed in this study can be provided for the analysis and design of the main shaft device of deep well hoist as a necessary theoretical basis.

Abstract: If there is no reliability, high-performance electronic devices indicator is no meaning. Reliability design, testing and verification methods of the vehicle electronic equipment are analyzed in this paper, and presented in the industry designed to improve the reliability of electronic equipment ideas, to regulate the reliability of electronic equipment designed to provide a technical basis.

Abstract: This paper introduced the definition of modern design method at first. Then the paper analyzed some typical modern design method such as optimization design, green design, man-machine engineering design, innovative design, industrial molding design, concurrent design, reliability design, finite-element method, robust design method and so on. The paper not only analyzed on the characteristics of them but also analyzed their applicability at the same time, at last the paper analyzed the application of those modem design methods in the design and develop process of mechanical product.

Abstract: According to the development direction of ship engine, this paper talks about the reliability design of ship main engine remote control system based on single chip microcomputer, including the system design of microcontroller, software and hardware reliability. Also, it points out some actual problem which met in designing, and gives the solution methods. These methods have obtained wide use in practice.

Abstract: In this paper, the application of reliability theory in the automobile rear axle has been studied. Essential theory and formulation for reliability estimate and design for rear axle are provided by perturbation method. The example in this paper has proved that the calculation result of the reliability design by using the perturbation method is very consistent with the real size of e-statistical rethsult. So, perturbation method can be widely applied in the rear axle’s design.

Abstract: Automatic open-parachute-device is an essential device in the field of aviation life-saving technology. In this paper, on the basic of the open-parachute-device mechanism, structure of its reliability function is given. According to its reliability indicators, considering the main failure mode and combining with similar products' reliability statistical data, analysis and design of reliability indicators are processed. Successively according to the principle of "redistribution method" and the principle of "proportional distribution method" about failure rate, the reliability indicators are calculated in detail. The results showed that the reliability indicators allocation with the "proportional distribution method" is little different from the reliability indicators allocation with the "redistribution method", but the former is more in line with the requirements. This design has a guiding significance to the product production.

Abstract: Physics-of-Failure (PoF) represents one approach to reliability assessment based on modeling and simulation that relies on understanding the physical processes contributing to the appearance of the critical failures. Firstly the connotation and meaning of PoF method were analyzed here, the inherence relation between PoF and reliability was expatiated, the PoF based reliability method and current reliability method based on probability statistics were compared, their differences and relationships were discussed here. Then the application condition of PoF method in reliability engineering in European and American developed country and China were summarized, the PoF based reliability engineering technologies were introduced systemically from several aspects, such as reliability design and analysis, reliability test and validation, maintain and support. Finally, combining with the developing characteristics of military materiel during the new period, some future investigation directions and application foregrounds were prospected.

Abstract: 8 pressure vessels of carbon fiber reinforced plastics (CFRP) have been manufactured with in the winding technology of same continuous carbon fiber–-amine system, new same flexible formula and same tension system. And the hydraulic bursting tests with the specimens were done in accordance with GB6058-85. The parameters of fiber strength, winding angle, geometric sizes and burst pressure were obtained by the tests. The theoretical analysis was done by conventional design method and reliability design method. The results show that: the theoretical calculating thickness of CFRP pressure vessel with by same parameters is thicker than practical thickness. This shows the performance of CFRP pressure vessel is related not only with fiber strength but also with material properties of resin matrix, tension and solidifying system of winding process. Because of CFRP (Carbon Fiber Reinforced Plastics) have many advantages which are high specific strength, high specific modulus, ablation resistance and low cost. Although the thing that composite materials have been substitutes for metal shell springs up soon, the application is much wide[1-6].

Abstract: Generally, action of constraints exists in reliability optimization design of mechanical parts. Usually, general optimum methods are adopted in reliability optimization design, so the local solution is obtained. Aimed at this situation, a global optimum method was introduced by Lingo13.0 software. The result shows the model is practical and effective and its solution is global solution better than the result with general optimum method. As the method is simple, it is worthy to spread in optimum design

Abstract: The strength of high temperature components is designed according to creep rupture strength. A statistical processing of creep rupture data of HK40 steel was performed by Z-parameter method based on Larson-Miller method. The data has been studied to evaluate the distribution under different temperature and stress. And the distribution of Z-parameter was investigated. With the application of Z-parameter, reliability design for allowable stress of creep rupture strength was carried out according to design life. The results show that the distribution of Z-parameter is supported by normal distribution. In comparison with allowable stress designed by conventional safety factor method, reliability design based on Z-parameter is more agree with experimental data.