基于加速退化试验的RV减速器寿命预测方法
发布时间：2018-07-16 23:56
【摘要】：本课题来源于国家自然科学基金《基于泛函逼近的旋转机械性能衰退预测》。随着我国的航天科技的不断壮大,各类型空间机构正在从“单次短时间使用”变成“长时间不间断使用”。这样的转变对空间机构的可靠性和耐用性提出了更高的要求。RV减速器作为一种新型的高扭矩传动机构被广泛用于各类空间机构和工业机器人当中。但现阶段RV减速器作为转动机构中的关键部件并没有一套成型的可靠性寿命预测方法和体系,这样会对RV减速器的保养和维修带来极大的影响,甚至还会对整体机构造成不可估量的伤害。针对上述问题,本文基于加速退化试验对RV减速器进行了寿命预测分析。通过对采集到的产品性能退化数据的处理,建立了RV减速器可靠性寿命模型,从而实现了预知RV减速器在正常工况下的可靠性寿命的可能。本文具体研究内容如下所示:1.明确了RV减速器的失效机理。首先逐一分析各种减速器常见实效形式及原因,并与RV减速器本身进行对比分析。其次参考RV减速器实际使用环境,并着重观察其系统关键部件磨损及消耗情况,最终分析明确RV减速器的失效机理。2.针对RV减速器进行了基于伪失效寿命的加速退化试验。首先确定了加速试验方案,包括选定合理的加速应力及样本数量等,其次搭建加速试验系统测试平台,并间断性地采集不同工况下的样本性能退化数据。3.通过对退化数据的处理获得产品寿命若干可靠性数据。首先依据传统退化模型及性能退化数据确定RV减速器性能退化模型,并参照失效阈值获得产品伪失效寿命。其次借助图估法及MATLAB拟合出了基于威布尔分布的RV减速器可靠性寿命分布函数,并对其进行了基于Minitab的假设检验,验证了产品寿命模型的合理性。最后对Weibull分布中的参数进行了基于极值分布和高斯-马尔科夫定理的参数估计,并获得了RV减速器在正常工况下的若干可靠性寿命数据。4.针对加速退化试验的关键环节进行分析验证。首先基于布朗运动原理建立性能退化模型,并与RV减速器寿命函数进行对比分析,从而验证本文产品寿命模型的合理性。其次基于扭转刚度条件对RV减速器进行了有限元仿真分析,获得产品实际扭转刚度,并与产品设计指标相对比,从而验证本文加速退化试验中加速应力选取的合理性。
[Abstract]:This topic comes from the National Natural Science Foundation of China, "Prediction of rotational mechanical properties decline based on functional approximation". With the development of space science and technology in China, all kinds of space agencies are changing from "single short time use" to "long time continuous use". As a new type of high torque transmission, RV reducer is widely used in all kinds of space mechanisms and industrial robots. However, RV reducer, as a key component of rotating mechanism, does not have a set of reliable life prediction methods and systems, which will have a great impact on the maintenance and repair of RV reducer. It can even cause incalculable damage to the whole organization. Aiming at the above problems, the life prediction analysis of RV reducer is carried out based on accelerated degradation test. The reliability life model of RV reducer is established by processing the data of product performance degradation, and the possibility of predicting the reliability life of RV reducer under normal working condition is realized. The specific contents of this paper are as follows: 1. The failure mechanism of RV reducer is clarified. Firstly, the common effective forms and causes of various reducers are analyzed one by one, and compared with RV reducers themselves. Secondly, referring to the actual operating environment of RV reducer, and observing the wear and consumption of the key parts of RV reducer, the failure mechanism of RV reducer is analyzed. The accelerated degradation test of RV reducer based on pseudo failure life was carried out. First, the accelerated test scheme is determined, including the reasonable acceleration stress and sample size, and then the test platform of the accelerated test system is built, and the performance degradation data of the samples under different working conditions are collected intermittently. 3. Some reliability data of product life are obtained by processing degradation data. Firstly, the performance degradation model of RV reducer is determined based on the traditional degradation model and the performance degradation data, and the pseudo-failure life of RV reducer is obtained by reference to the failure threshold. Secondly, the reliability life distribution function of RV reducer based on Weibull distribution is fitted with the help of graph estimation method and MATLAB, and the hypothesis test based on Minitab is carried out to verify the rationality of the product life model. Finally, the parameters of Weibull distribution are estimated based on extreme value distribution and Gao Si Markov theorem, and some reliability life data of RV reducer under normal working condition are obtained. The key link of accelerated degradation test is analyzed and verified. Firstly, a performance degradation model based on Brownian motion principle is established and compared with the RV reducer life function, which verifies the rationality of the product life model in this paper. Secondly, based on the torsional stiffness condition, the finite element simulation analysis of RV reducer is carried out, and the actual torsional stiffness of the product is obtained, and compared with the product design index, which verifies the rationality of the accelerated stress selection in the accelerated degradation test in this paper.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH132.46;V441
本文编号：2128125
[Abstract]:This topic comes from the National Natural Science Foundation of China, "Prediction of rotational mechanical properties decline based on functional approximation". With the development of space science and technology in China, all kinds of space agencies are changing from "single short time use" to "long time continuous use". As a new type of high torque transmission, RV reducer is widely used in all kinds of space mechanisms and industrial robots. However, RV reducer, as a key component of rotating mechanism, does not have a set of reliable life prediction methods and systems, which will have a great impact on the maintenance and repair of RV reducer. It can even cause incalculable damage to the whole organization. Aiming at the above problems, the life prediction analysis of RV reducer is carried out based on accelerated degradation test. The reliability life model of RV reducer is established by processing the data of product performance degradation, and the possibility of predicting the reliability life of RV reducer under normal working condition is realized. The specific contents of this paper are as follows: 1. The failure mechanism of RV reducer is clarified. Firstly, the common effective forms and causes of various reducers are analyzed one by one, and compared with RV reducers themselves. Secondly, referring to the actual operating environment of RV reducer, and observing the wear and consumption of the key parts of RV reducer, the failure mechanism of RV reducer is analyzed. The accelerated degradation test of RV reducer based on pseudo failure life was carried out. First, the accelerated test scheme is determined, including the reasonable acceleration stress and sample size, and then the test platform of the accelerated test system is built, and the performance degradation data of the samples under different working conditions are collected intermittently. 3. Some reliability data of product life are obtained by processing degradation data. Firstly, the performance degradation model of RV reducer is determined based on the traditional degradation model and the performance degradation data, and the pseudo-failure life of RV reducer is obtained by reference to the failure threshold. Secondly, the reliability life distribution function of RV reducer based on Weibull distribution is fitted with the help of graph estimation method and MATLAB, and the hypothesis test based on Minitab is carried out to verify the rationality of the product life model. Finally, the parameters of Weibull distribution are estimated based on extreme value distribution and Gao Si Markov theorem, and some reliability life data of RV reducer under normal working condition are obtained. The key link of accelerated degradation test is analyzed and verified. Firstly, a performance degradation model based on Brownian motion principle is established and compared with the RV reducer life function, which verifies the rationality of the product life model in this paper. Secondly, based on the torsional stiffness condition, the finite element simulation analysis of RV reducer is carried out, and the actual torsional stiffness of the product is obtained, and compared with the product design index, which verifies the rationality of the accelerated stress selection in the accelerated degradation test in this paper.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH132.46;V441
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