Techniques from the perturbation method, the Edgeworth series, the reliability-based design theory, and the sensitivity analysis approach are employed to present a practical and efficient method for the reliability sensitivity of automobile components with arbitrary distribution parameters. On the condition of first four moments of original random variables known, the reliability sensitivity theory and case studies are researched. The respective program can be used to obtain the reliability sensitivity of automobile components with arbitrary distribution parameters accurately and quickly.
The reliability-based optimization, the reliability sensitivity technique, and the robust design are employed to present a practical and effective approach of robust reliability design for mechanical components on the condition of known probabilistic characteristics of original random variables. The theoretical formula of robust reliability design for mechanical components is obtained. The respective program can be used to obtain the robust reliability design parameters accurately and quickly. According to the numerical results, the method proposed is a convenient and practical robust reliability design method. Downloaded fromThe initial values, d 1 ¼ 9 mm, d ¼ 16 mm, D ¼ 80 mm, n ¼ 10, are given, and the optimal d 1 , d, D, and n are d 1 ¼ 5.000497 mm, d ¼ 10.0008 mm, D ¼ 76.81712 mm, n ¼ 7.017805.
The coil tube spring, a new type of spring, has been recently used in engineering. This paper presents a method for reliability-based analysis of a coil tube spring. A technique, using the perturbation method and reliability-based design theory, is employed to present a practical and effective method for the reliability-based analysis of a coil tube spring. Theoretical formulae of the reliability of a coil tube spring are obtained. The given approach can be used to determine the reliability of a coil tube spring accurately and quickly.
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