| 机械可靠性的灵敏度研究 |
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| 引用本文： | 莫文辉,邢波,张金海.机械可靠性的灵敏度研究[J].十堰职业技术学院学报,2004,17(4):64-66. |
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| 作者姓名： | 莫文辉 邢波 张金海 |
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| 作者单位： | 1. 华中科技大学,湖北,武汉,430074;十堰职业技术学院,机械工程系,湖北,十堰,442000
2. 十堰职业技术学院,机械工程系,湖北,十堰,442000 |
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| 基金项目： | 十堰职业技术学院科研项目 (2 0 0 4KN0 4)阶段性成果 |
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| 摘 要： | 基于FORMS研究了机械可靠性的灵敏度。首先是建立极限状态方程,应用一次二阶迭代法求出数值,得到可靠性,σxiP 点坐标。其次是计算安全指标β,最后是β对设计参数求偏导数并代入P 点坐标X^i,μxi的灵敏度。给出了多种失效模式可靠性的灵敏度计算方法。算例表明可靠性对设计参数的灵敏度相差很大。灵敏度大小可作为再设计时修改设计参数的依据。可靠性对某一设计参数的敏感性较大,设计师在设计该参数时应给出合理的公差。需要机械加工时,应采用精加工方法,确保该设计参数精确。可靠性对某一设计参数的敏感性很小,计算可靠度时,该设计参数可以当作常数来处理,机械加工时可以采用粗加工方法。不进行灵敏度分析的机械可靠性设计是盲目的。
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| 关 键 词： | 机械 可靠性 灵敏度 |
| 文章编号： | 1008-4738(2004)04-0064-03 |
| 修稿时间： | 2004年10月20 |
A Study on Sensitivity of Mechanical Reliability |
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| MO Wen-hui.A Study on Sensitivity of Mechanical Reliability[J].Journal of Shiyan Technical Institute,2004,17(4):64-66. |
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| Authors: | MO Wen-hui |
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| Institution: | MO Wen-hui~ |
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| Abstract: | Based on FORMS, sensitivity of mechanical reliability is studied. First, limit state equation is established and using the directional cosines method, point coordinates are obtained. Second, safety index is calculated. At last, differentiates with respect to design parameter and datum of and point coordinates are substituted, sensitivity of reliability is given. Under several failure modes, method that calculates sensitivity of reliability is presented. An example indicates that reliability is sensitive to design parameters which is very different. In an example, evaluation method is a simple method to analyse sensitivity of reliability. On the basis of sensitivity, we can modify parameters. If reliability is very sensitive to a parameter, designer should provide rational tolerance. When it is manufactured, precise process is adopted to guarantee accurate design parameter. If reliability is less sensitive to a parameter, we regard it as constant and is processed by coarse process. Mechanical reliability design that does not analyse sensitivity is unreasonable. |
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| Keywords: | mechanical reliability sensitivity |
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