水泥混凝土泵车振动试验与疲劳寿命分析

【作者】 张大庆；

【导师】 吕彭民；

【作者基本信息】 长安大学 ， 机械设计及理论， 2003， 硕士

【摘要】 本论文以某公司生产的水泥混凝土泵车为研究对象，采用TBS—2000应变测试系统对该泵车进行了动、静态应力测试及固有频率测试。利用虚拟仪器的典型开发平台LabVIEW针对TBS—2000应变测试系统开发了数据处理软件；利用该数据处理软件对测试所得的数据进行了动、静应力分析和固有频率分析。在进行静应力分析中，计算出该型泵车所测工况所有测点的静应力，通过对所有数据综合分析之后，得出该型泵车在工作时不同工况的静应力危险部位；在进行动应力分析过程中，分别求出不同工况的工作频率，并与该泵车液压系统测试实验分析结果进行比较，二者结果比较吻合；对泵车进行固有频率分析的主要目的是求得该型泵车的一阶固有频率，以寻求该泵车振动较大的原因。在动应力分析的基础上，利用美国MSC公司的nSoft软件对该型泵车进行了疲劳寿命分析，计算出泵车上所有测点的疲劳寿命，综合分析后得出该型泵车的疲劳寿命危险点。结合动应力分析结果、固有频率分析结果及疲劳寿命分析结果可以看出：系统的激扰频率与结构一阶固有频率比较一致以及液压系统的冲击是引起泵车工作时振动的主要原因。通过分析泵车各个工况的工作频率与其固有频率的关系，推荐该型泵车在现有的性能参数下，取流量为150l／min进行工作比较理想。更多还原

【Abstract】 In this paper, a pump auto piping concrete made by some company is used as an object of study, and TBS-2000 Strain Measuring System is used to measure the pump in the way of dynamic stress, statistic stress and proper frequency. Data processing software is designed for TBS-2000 Strain Measuring System in the classical Virtual Instruments Engineering workbench; it is applied to process the data which are acquired in the way of dynamic stress analysis, statistic stress analysis and proper frequency analysis. The statistic stresses of are gained during the course of statistic stress analysis. Statistic stress dangerous positions of bump on different working situations are got by generally analyzing all of the data. The working frequencies on different working situations are gained during the course of dynamic stress analysis, at the same time they are compared with the results of the bump hydraulic system measuring experiment, they are quietly consistent with each other. The main aim at analysis of the bump inherent frequency is to get its first frequency, which is used to find out the reason why the bump vibrates so serious. The nSoft software of USA MSC Corporation is used to analyze the bump in the way of fatigue strength reliability on the basis of dynamic stress analysis, and getting all of measured points’ fatigue strength reliability, fatigue strength dangerous positions of bump on different working situations are got by generally analyzing all o"f the data. The reason that bump vibrates when working is bump system’s stimulus frequency is quite consistent with its inherent frequency and its hydraulic system’s impact. By analyzing bump working frequencies’ relation to its inherent frequency, the 150-liter per minute input flow is recommended at exiting function parameters.更多还原