机车振动论文机车车辆多点激励模态试验系统研究.docVIP

机车振动论文：机车车辆多点激励模态试验系统研究 【中文摘要】随着机车车辆运营速度的提高,车辆振动强度也随之增强,影响了结构的疲劳寿命。研究结构振动特性,可以优化车辆结构,抑制过大振动,改善车辆性能,具有重要意义。而模态试验是获得结构振动特性的主要手段之一,其中多点协调激励模态试验能够在提高模态纯度的同时准确识别铁道车辆模态参数。本文以车辆为研究对象,研制了多点协调激励系统,并进行结构动态特性参数测试。第二章阐述了多点协调激励模态试验技术原理；探讨了多点协调激励在二系悬挂车辆上进行模态试验的适用性,同时建立具有二系悬挂车辆的纯模态判据和模态纯度指示函数；应用多点协调激励模态技术,对某二系悬挂车辆进行了仿真。第三章以二系悬挂模型车为对象,以多点协调激励理论为基础,Labview为编写平台,研制了多输入多输出纯模态试验系统。系统采用网格法对调力区间进行了优化设计；利用模态纯度指标为目标函数实现了系统的反馈控制。最后,应用研制的模态试验系统对二系悬挂模型车进行了多点协调激励模态试验,得到了模型车各阶固有频率及振型。对比使用Ploymax参数识别方法获得的该模型车的固有频率和振型,表明在误差范围内两次试验的结果是一致的,而多点协调激励法获得的各阶模态纯度更高。 【英文摘要】With the increasing velocity of locomotive train, the train vibration also has increased, thus the structure fatigue life is influenced. It is meaningful to study the vibration characteristics of structure, through which we can optimize the structure of vehicles, restrain the overlarge vibration and improve the performance of vehicles. Modal test is one of the major means to obtain structural vibration characteristics. Multi-point coordinated excitation modal test can accurately identify the modal parameters of railway vehicles and improve the modal purity at the same time. Taking the vehicle as the object of study, this paper developed a multi-point coordinated excitation system, and made the structural dynamic characteristics parameter testing.Chapter two introduced the principle of the multi-point coordinated excitation modal test technology, the applicability of multi-point coordinated excitation modal test on secondary suspension vehicles, and established the pure modal criterion and modal purity indicating functions of secondary suspension vehicles at the same time, then conducted the simulation on secondary suspension vehicle by applying the multi-point coordinated excitation modal technique.In chapter three, taking the secondary suspension model car as the object, taking the multi-point coordinated excitation theory as the basis and the Labview as the compiling platform, a multi-input and multi-output pure modal test system was