摘要
研究了无限长梁上动力吸振器抑制弯曲振动波传递的机理,分别推导了一个和两个动力吸振器下无限长梁上透射系数的计算公式,讨论了动力吸振器质量、阻尼及个数对结构声传递抑制的影响。数值计算结果表明,动力吸振器的阻抑效果具有较强的频率选择性。其质量的增加对阻抑效果有利;阻尼增加虽降低了最佳的阻抑效果,但抑制的频带宽了,改善了阻抑效果的频率选择性;在总质量相同的条件下,多个动力吸振器的阻抑效果较单个的阻抑效果好。
The impediment to propagation of a flexural vibration wave in an infinite beam using vibration absorbers is studied. The formulae of transmission coefficient for an infinite beam with an incident flexural wave and impeded by one and two vibration absorbers axe derived respectively. The effects of the mass, the damping and the number of the vibration absorbers on impediment to stfucture-borne sound propagation are discussed. Numerical results show that the impeding effect of the vibration absorbers reveals strong selectivity on frequency. Increase in mass is good for the impeding effect. Increase in damping weakens the maximum impeding effect,but it widens the frequency band of imPedimellt and improves the frequency selectivity accordingly. For the same total mass, the impeding effect of multiple vibration absorbers is better than that of single vibration absorber.
出处
《噪声与振动控制》
CSCD
北大核心
2005年第1期1-4,共4页
Noise and Vibration Control
关键词
振动与波
结构声传递
动力吸振器
透射系数
vibration and wave
structure-bome sound propagation
vibration absorbers
transmission coefficient
