伺服控制器加速退化试验方法研究

发布时间：2018-01-15 10:05

本文关键词：伺服控制器加速退化试验方法研究　出处：《浙江理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：伺服控制器是数控设备控制系统的核心单元,一旦发生故障,必将导致数控设备故障、停机。与世界制造强国相比,国产伺服控制器在可靠性水平方面存在较大差距,中高档伺服控制器主要依赖于进口,自给率不足10%。为增强国产伺服控制器的市场竞争力,提升自主创新能力,亟需建立伺服控制器可靠性测评试验方法。通过快速测评伺服控制器的可靠性,可以在短期内获知其可靠性水平、暴露潜在设计缺陷和薄弱环节,并依此改进设计,提升国产伺服控制器可靠性水平。本文通过对伺服控制器加速退化试验方法的研究,提出一种加速退化试验方法,实现对伺服控制器可靠性的快速测评。本文主要研究内容与结论如下:第一章,概述了论文的研究背景、目的和意义;综述了加速退化试验及试验统计分析方法方面的国内外研究现状和发展趋势,以及系统级产品加速退化试验与试验数据统计分析方面存在的问题;结合研究目标提出了本文的研究内容。第二章,分析确定了伺服控制器组成和工作原理;通过调研与试验分析,确定了导致伺服控制器无脉冲信号输出、显示屏无显示、滤波电容失效、按键失灵等故障发生的主要应力因素为高温环境和电应力;通过环境模拟试验,确定了环境应力和工作应力对伺服控制器工作性能的影响程度,以及输出脉冲电压变化可以表征产品性能变化;通过加速试验,发现了不同温度应力水平下输出脉冲电压变化量可被用作特征参量描述伺服控制器性能退化过程,以及输出脉冲电压随温度应力与试验时间的变化规律;为设计伺服控制器加速退化试验奠定了基础。第三章,依据伺服控制器输出脉冲电压随温度应力与试验时间的变化规律,提出了一种可以在进行恒定应力加速退化试验期间测量不同温度应力水平下输出脉冲电压差值的温度应力施加方式;利用条件广义协方差极小法,经过对加速试验数据的统计论分析,提出了温度应力水平的选取准则,建立了加速退化试验应力施加剖面,保障了伺服控制器加速退化试验的成功实施。第四章,开展了加速退化试验,通过分析确定了利用幂函数退化模型可以描述不同温度应力水平下输出脉冲电压变化量的变化过程,并依此计算出了伺服控制器的伪失效寿命;综合利用图分析法、拟合优度检验和相关性检验方法,确定了伺服控制器的寿命服从对数正态分布;在此基础上,基于Arrenius加速模型计算出了伺服控制器在工作温度应力下的可靠寿命;试验分析结果表明,利用本文提出的加速退化试验方法能够实现对伺服控制器可靠性的快速测评。第五章,总结了本文的研究内容,并对进一步的研究工作进行了展望。
[Abstract]:Servo controller is the core unit of NC equipment control system. Once it breaks down, it will lead to the failure and shutdown of NC equipment, compared with the world manufacturing power. There is a big gap in the reliability level of the domestic servo controller. The medium and high grade servo controller mainly depends on the import and the self-sufficiency rate is less than 10% in order to enhance the market competitiveness of the domestic servo controller. In order to improve the capability of independent innovation, it is urgent to establish the reliability test method of servo controller. The reliability level of servo controller can be obtained in a short period of time by quickly evaluating the reliability of servo controller. Expose the potential design defects and weak links, and improve the design according to this, improve the reliability level of domestic servo controller. This paper studies the accelerated degradation test method of servo controller. An accelerated degradation test method is proposed to evaluate the reliability of servo controller. The main contents and conclusions of this paper are as follows: the first chapter summarizes the research background, purpose and significance of the paper; The research status and development trend of accelerated degradation test and test statistical analysis methods at home and abroad, and the problems existing in the statistical analysis of system grade product accelerated degradation test and test data are summarized. In the second chapter, the composition and working principle of servo controller are analyzed and determined. Through investigation and experimental analysis, it is determined that the main stress factors that cause the servo controller to have no pulse signal output, display screen without display, filter capacitor failure, key failure and so on are high temperature environment and electric stress. The influence of environmental stress and working stress on the performance of servo controller is determined by environmental simulation test, and the change of output pulse voltage can be used to characterize the performance of the servo controller. Through the accelerated test, it is found that the output pulse voltage variation can be used as a characteristic parameter to describe the performance degradation process of the servo controller at different temperature stress levels. And the variation of output pulse voltage with temperature stress and test time; It lays a foundation for the design of servo controller accelerated degradation test. Chapter 3, according to the servo controller output pulse voltage with temperature stress and test time variation rule. In this paper, a new method of applying thermal stress is proposed, which can measure the difference of output pulse voltage at different temperature stress levels during the accelerated degradation test of constant stress. By using the conditional generalized covariance minimization method and the statistical analysis of the accelerated test data, the criterion of selecting the temperature stress level is put forward, and the stress applied profile of the accelerated degradation test is established. It ensures the successful implementation of the servo controller accelerated degradation test. Chapter 4th, the accelerated degradation test is carried out. The power function degradation model is used to describe the variation process of output pulse voltage under different temperature stress levels, and the pseudo-failure life of servo controller is calculated. The logarithmic normal distribution of the service life of the servo controller is determined by using the graph analysis method, the goodness of fit test and the correlation test method. On this basis, the reliable life of the servo controller under the working temperature stress is calculated based on the Arrenius acceleration model. The experimental results show that the accelerated degradation test method proposed in this paper can be used to quickly evaluate the reliability of servo controller. Chapter 5th summarizes the research contents of this paper. The further research work is prospected.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

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