不同气锤组合方式的气动式振动台性能研究  

PERFORMANCE OF A REPETITIVE SHOCK MACHINE WITH DIFFERENT COMBINATIONS OF VIBRATORS

作　　者：王考[1] 陶俊勇[1] 陈循[1] 

机构地区：[1]国防科技大学机电工程与自动化学院机电工程研究所,长沙410073

出　　处：《振动与冲击》2008年第4期126-130,142,共6页Journal of Vibration and Shock

摘　　要：气动式振动台振动信号的频域能量分布不均匀且低频能量较低,这限制了该设备在电子产品可靠性强化试验中的进一步应用。由于商业竞争和技术保密等原因,目前国内对该设备的优化设计与自主研发尚未全面展开。根据薄板振动理论建立了气动式振动台的力学模型,采用能量法(Rayleigh-Ritz法)分析和计算了振动台面的固有频率和正则振型,针对三种不同的气锤组合方式,采用分析多自由度系统响应的振型叠加法分别计算了振动台面的强迫振动响应,进而对气动式振动台振动信号产生的机理进行了探索。在此基础上,根据气动式振动台的性能评价指标,进一步对三种气锤组合方式的气动式振动台性能优劣进行了评价,为整个气动式振动台的性能改善及自主研发提供了理论指导。Repetitive shock(RS) machines have some shortages,such as,energy nonuniformity in frequency domain,lower energy in low frequency range,and so on.These drawbacks confine application of RS machines in reliability enhancement testing of electronic assemblies.However,many key technologies of RS machines have not been studied in detail in our country because of lacking technical details.Here,the natural frequencies and modal shapes of the table are calculated and analyzed based on Rayleigh-Ritz method for elastic rectangular plates.Then,the mode-superposition method for a multiple-degree-of-freedom system is employed to calculate the forced vibration responses of the vibration table under three combinations of vibrators.Finally,three RS machines with different combinations of vibrators are evaluated by the performance indexes of RS machines.

关 键 词：气动式振动台 固有频率 振型 强迫振动响应 性能指标 

分 类 号：TB123[理学—工程力学] TH692.9[理学—力学]