基于Gamma过程的关节轴承加速可靠性验证方法

发布时间：2018-01-04 10:45

本文关键词：基于Gamma过程的关节轴承加速可靠性验证方法　出处：《国防科学技术大学》2013年硕士论文　论文类型：学位论文

【摘要】：关节轴承是一种特殊结构的滑动轴承,具有结构简单、承载大和自调心的特点,在航空航天、工程机械等领域应用广泛。关节轴承在使用过程中由于磨损使得径向间隙增大而失效,导致操纵部件精度降低、控制失效,甚至给整个装备带来灾难性后果。可靠性验证能够通过试验检验关节轴承的可靠性是否达到要求水平,确保设计生产出来的成品满足既定的可靠性要求,对装备的可靠安全运行具有非常重要的意义。造成关节轴承失效的主要原因为磨损,在正常工况下轴承磨损失效的时间很长,若采用传统可靠性验证方法验证关节轴承可靠性指标,工程中难以实施,因而需要引入加速退化试验技术开展可靠性验证方法研究,以解决传统验证试验效率不高的问题。本文通过引入加速退化试验提高试验效率,并利用Gamma过程描述关节轴承的退化过程,建立了基于Gamma过程的加速可靠性验证方法,为关节轴承的可靠性验证提供技术支撑。本文主要研究内容如下:(1)分析了关节轴承的退化失效过程,重点讨论了关节轴承的失效机理。在此基础上,建立了关节轴承加速可靠性试验的退化模型、加速模型等主要模型,提出了Gamma过程的K-S检验方法。(2)提出了基于Gamma过程的加速可靠性试验方案的设计方法,通过预试验获取先验信息及对可靠性指标进行转化,实现可靠性验证试验方案的设计。仿真结果表明,利用本文方法对具有单调退化过程的退化型产品进行可靠性验证,在较短的时间内能够给出可信度较高的验证结果。(3)引入BS分布描述产品的累计失效分布,对可靠性验证试验方案优化问题进行描述并建立了优化模型。提出了验证试验方案的优化方法,为关节轴承加速可靠性试验的顺利实施奠定基础。Monte Carlo仿真评价表明优化试验方案可以有效提高验证结果精度。(4)针对某型关节轴承实施了加速可靠性验证试验,对所提出的可靠性指标进行了有效验证。结果表明,采用Gamma过程描述关节轴承磨损退化过程是准确、合理的。通过考虑先验信息偏差对基本验证试验方案进行优化,更符合实际情况,所得验证结果更准确,从而验证了本文方法的可行性和有效性。综上所述,论文从理论分析、仿真验证和工程应用等方面系统研究了关节轴承加速可靠性验证中的建模与方案设计问题,并在此基础上提出了基于Gamma过程的关节轴承加速可靠性验证方法。本文研究成果对加速试验技术在关节轴承可靠性验证中的研究应用具有重要的借鉴意义。
[Abstract]:Joint bearing is a special structure of sliding bearing, with simple structure, bearing large and self-centring characteristics in aerospace. Joint bearings are widely used in the field of construction machinery. The radial clearance increases due to wear, which leads to the reduction of the precision of the control parts and the failure of control. Reliability verification can test whether the reliability of the joint bearings reaches the required level and ensure that the finished products designed and produced meet the established reliability requirements. It is very important for the reliable and safe operation of the equipment. The main reason for the failure of the joint bearing is wear, and the bearing wear failure time is very long under normal working conditions. If the traditional reliability verification method is used to verify the reliability index of the joint bearing, it is difficult to implement in the engineering, so it is necessary to introduce the accelerated degradation test technology to carry out the reliability verification research. In order to solve the problem that the efficiency of traditional verification test is not high, this paper improves the test efficiency by introducing accelerated degradation test, and describes the degradation process of joint bearing by Gamma process. An accelerated reliability verification method based on Gamma process is established to provide technical support for reliability verification of joint bearings. The main contents of this paper are as follows: 1) the degradation failure process of joint bearings is analyzed. The failure mechanism of joint bearing is discussed in detail. On this basis, the degradation model, acceleration model and other main models of accelerated reliability test of joint bearing are established. The K-S test method of Gamma process is put forward. The design method of accelerated reliability test scheme based on Gamma process is presented. The design of the reliability verification test scheme is realized by obtaining the prior information and transforming the reliability index through the pre-test. The simulation results show that. The method is used to verify the reliability of degraded products with monotone degradation process. In a short time, the reliability of the verification results can be given. 3) the introduction of BS distribution to describe the cumulative failure distribution of the product. The optimization problem of reliability test scheme is described and the optimization model is established. It lays a foundation for the successful implementation of the joint bearing accelerated reliability test. Monte Carlo simulation evaluation shows that the optimized test scheme can effectively improve the accuracy of the verification results. An accelerated reliability verification test is carried out for a certain type of joint bearing. The results show that it is accurate to use Gamma process to describe the wear degradation process of joint bearing. Reasonable. By considering the prior information deviation to optimize the basic verification test scheme, it is more in line with the actual situation, and the verification results are more accurate, which verifies the feasibility and effectiveness of this method. In this paper, the modeling and scheme design of joint bearing accelerated reliability verification are systematically studied from the aspects of theoretical analysis, simulation verification and engineering application. On this basis, an accelerated reliability verification method of joint bearing based on Gamma process is proposed. The research results in this paper have important reference for the research and application of accelerated test technology in the reliability verification of joint bearing. Righteousness.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TB114.3;TH133.31

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