气动式振动台理想激励信号的特性  

Characteristics of Ideal Exciting Signals of Repetitive Shock Machine

作　　者：王考[1] 陶俊勇[1] 陈循[1] 易晓山[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,长沙410073

出　　处：《机械工程学报》2009年第8期142-147,共6页Journal of Mechanical Engineering

摘　　要：气动式振动台是一类重要的可靠性振动强化试验设备,目前国内尚未对其关键技术及自主研发展开全面研究。根据薄板振动理论建立气动式振动台的力学模型,采用能量法(Rayleigh-Ritz法)分析和计算振动台面的固有频率和正则振型,将用于机械系统动力学分析的传递函数引入到振动台系统,推导气锤安装位置与振动台面任意响应位置之间的力―加速度传递函数,在此基础上,构建气动式振动台的动力学模型,揭示振动台面受到的激励力信号与其加速度响应信号之间的关系,针对振动台的"理想"加速度响应信号,进一步计算与之对应的"理想"激励力信号,并分析该激励信号的特性,为该类设备的性能改善乃至自主研发提供理论指导。Repetitive shock （RS） machines are a kind of significant equipment for reliability enhancement testing. However, many key technologies of RS machines have not been studied in detail in our country. Now a mechanics model of RS machine is established by combining with the vibration theory of elastic rectangular plates. According to the Rayleigh-Ritz method of elastic rectangular plates, the natural frequency and normal vibration mode of the vibration table are calculated, then the transfer function used in dynamic analysis of mechanical system is introduced to the vibration table system, and the force-acceleration transfer function between the location of air hammer and an arbitrary response position on the vibration table is derived. On this basis, a dynamic model of RS machine is constructed, so as to reveal the relationship between the signals of exciting force received by the vibration table and its acceleration response signals. In view of the ＂ideal＂ acceleration response signals of the vibration table, the corresponding ＂ideal＂ exciting force signals are calculated, and the characteristics of the excitation signals are analyzed, which will provide theoretical guidance for performance improvement and even independent development of RS machines.

关 键 词：气动式振动台 固有频率 振型 传递函数 响应信号 激励信号 

分 类 号：TH692.9[机械工程—机械制造及自动化]