【作者】 李晶；

【导师】 左明健； 黄洪钟；

【作者基本信息】 电子科技大学 ， 机械制造及其自动化， 2014， 硕士

【摘要】 舰艇中某装置是一个大型复杂系统,其可靠性要求非常高,任何关键有寿件的性能和可靠性都对其整个系统具有不可忽视的作用。电控模块是某装置的控制核心,也是关键有寿件之一,因此该电控模块的可靠性直接关系到整个系统的可靠性,是装置可靠性达到使用要求的必要条件。为评估电控模块能否达到服役要求,需要对其可靠性和使用寿命进行评估和验证。本文利用电控模块的现场使用数据和试验数据对其可靠性和使用寿命进行评估。本文的主要研究工作如下:(1)使用现场使用数据对电控模块的失效率进行评估。由于无失效数据分析是可靠性数据分析中的一个难点,现有方法都存在一定的局限性。本文采用贝叶斯方法对现场数据进行评估,提出一种应用于指数分布寿命评估时的参数选择方法。在计算过程中,确定合适的参数值,进而提高计算的准确性。(2)在估算失效率之后。将开机次数用作成败型试验数据,结合现场使用数据中的使用时间和开机次数估算电控模块的可靠度置信下限。(3)为评估电控模块能否满足在海洋环境下服役要求,参考国军标等有关标准,设计环境鉴定试验方案并实施。主要包括霉菌试验和盐雾试验,以鉴定电控模块本身的抗霉菌和盐雾腐蚀的能力。(4)盐雾试验具备加速寿命试验的特征。本文基于加速寿命试验的数据处理方法,利用盐雾试验得到的一些数据,对电控模块的服役年限进行量化估算。在此基础上,提出一种计算实验室环境和自然使用环境折合的环境因子的方法。并利用对电控模块的试验前后性能测量数据,参考其性能退化轨迹,对电控模块的服役年限给出较为精确的估算。最后结合其现场使用寿命的计算结果,证明所提出的方法能够很好的估算电控模块的可靠性,电控模块具有较高的可靠性,能够满足使用寿命要求。更多还原

【Abstract】 The transmission system is a large complex system of ship equipment. High reliability of its subsystem or critical part makes an important contribution to the reliability of whole transmission system. Electronic control module is the control center of transmission system and also is one of the key components. Therefore, the reliability of electronic control module to meet the requirement is a prerequisite of the whole system to achieve the required reliability. With the purpose of assessing whether the electronic control module could be achieved the service requirements, assessment of its reliability and service life evaluation and validation is needed. In this article, we assess the service life and reliability of the electronic control module according to field zero-failure data and laboratory test data.The main research work of this thesis:(1) Failure rate of electronic control module is assessed according to the field censoring zero-failure data. Since reliability analysis of zero-failure data is a difficult issue in this field, there are some limitations for these methods. In this paper, a solution is proposed to select the parameters of the Bayes’ method when it is applied to evaluate the MTBF of exponential distribution of life. In the calculation process, better relevant parameters can guarantee the results more accurate and reliable.(2) After estimating the failure rate of electronic control module based on the field data, the number of success boot times as success-type test was used to estimate the lower confidence limit of reliability combined with exponential data and the binomial Data.(3) In order to assess the electronic control module that meets the service requirements in the marine environment, we designed environmental qualification tests refer to the military standard and other relevant standards. They are the mold test and the salt spray test. The purpose of these two tests is to identify the electronic control module itself anti-fungal and salt spray corrosion.(4) The salt spray test has some properties of accelerated life testing. In this paper, we reference the accelerated life test data processing method, using some of the data obtained in the salt spray test to estimate the service life of the electronic control module. To solve this problem, we proposed a method of calculating the environmental factors to transform laboratory environment to the natural environment equivalent. Then measurement the performance data of Electronic control module before and after the test, with the performance degradation trajectory of the service life of electronic control module, a more accurate estimate of its life was given. Finally, combining the results of its on-site service life, we assessed the reliability of Electronic control module to meet service requirements.更多还原