气动执行元件失效评估试验方法研究

发布时间：2018-05-25 18:39

本文选题：气缸 + 加速寿命试验　；参考：《电子科技大学》2011年硕士论文

【摘要】：本文选择SMC公司CJ2B10-50型气缸作为研究对象,并以恒定应力加速寿命试验为例,开展气动执行元件失效评估试验方法研究。本试验所用气缸缸径为10mm,行程为50mm,并在SMC气缸上施加0.05Kg的砝码作为恒定载荷,通过PLC控制回路,确保气缸稳定工作在200mm/s的平均速度、3Hz的切换频率下。在其要求的基本条件下分别用静态测试回路和动态测试回路测试了气缸的始动压、泄漏量和行程时间,并记录测试数据。气缸失效性评估方法的优劣在于由该分析方法所得出的数据,是否能真实而准确的反映气缸的性能指标,同时气缸性能的评估主要通过泄漏量、始动压力以及行程时间等参数来反映,所以对泄漏量、始动压力以及行程时间等数据的测量计算又是整个方法评估中非常关键的一步。记录并整理数据后,参照ISO2007标准分析判断9组气缸是否失效和其对应的失效模式。做出9组失效气缸相同测试对象不同测试数据的纵向对比图,并对数据进行两参数的Weibull分布假设检验,采用两参数的Weibull分布函数模型对数据进行分析并估计出其形状和尺度参数,先对气缸的可靠寿命进行预估计然后用Matlab做出数据的威布尔概率分布曲线来对结果进行检验。对SMC气缸的失效模式和效果进行分析得知其主要的失效模式为可动部件的磨损,由此确定了加速应力和故障判断基准,并制定了恒定应力加速寿命试验谱。试验结果说明该失效评估试验方法切实可行,大大缩短了试验时间,节省了资源。
[Abstract]:This paper chooses the CJ2B10-50 cylinder of SMC company as the research object, and takes the constant stress accelerated life test as an example to carry out the study on the failure evaluation test method of the pneumatic actuator. The cylinder bore of this test is 10mm, the stroke is 50mm, and the 0.05Kg weight of the SMC cylinder is used as a constant load, and the PLC control loop is used to ensure the cylinder. The steady work is at the average speed of 200mm/s and the switching frequency of 3Hz. Under the basic conditions required, the static test loop and the dynamic test loop are used to test the initial pressure of the cylinder, the leakage and the travel time, and record the test data.
The advantages and disadvantages of the failure assessment method of cylinder are whether the data obtained from the analysis method can reflect the performance index of the cylinder truly and accurately, and the performance evaluation of the cylinder is mainly reflected by the parameters of leakage, initial pressure and travel time, so the data of leakage, initial pressure and travel time are measured. Computation is a key step in the whole method evaluation.
After recording and sorting out the data, the 9 groups of cylinders are judged to be invalid and their corresponding failure modes are judged according to the ISO2007 standard. The longitudinal contrast diagram of the 9 groups of the same test objects for different test data is made, and the Weibull distribution hypothesis testing of the data is carried out with the two parameters, and the data is carried out by the Weibull distribution function model of the two parameter. The shape and scale parameters are analyzed and estimated. The reliability life of the cylinder is estimated first and the Weibull probability distribution curve of the data is made with Matlab to test the results.
The failure mode and effect of the SMC cylinder are analyzed. The main failure mode is the wear of the movable components, thus the acceleration stress and the fault judgement datum are determined, and the constant stress accelerated life test spectrum is formulated. The test results show that the failure evaluation test method is practical, greatly shortens the test time and saves the resources.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH138.5

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