泡沫材料厚度对其刚度及阻尼系数的影响

冯 涛; 苏 彬; 刘 斌; 黎亚军; 李知微; 王 晶

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泡沫材料厚度对其刚度及阻尼系数的影响
冯涛, 苏彬, 刘斌, 黎亚军, 李知微, 王晶
北京工商大学，北京 100048

摘要:

根据隔振分析模型，建立了相应的实验测量系统，测量并分析了泡沫材料的刚度及阻尼系数。采用激振台对泡沫材料施加激励，由2个加速度计拾振，获得了由泡沫材料组成的缓冲包装系统的振动传递比曲线，应用非线性拟合方法计算得到了阻尼比，并求得了刚度和阻尼系数。实验结果表明：泡沫材料刚度随其厚度增加而递减，阻尼系数则在一定范围内随厚度增加而降低；泡沫材料厚度的增加会降低缓冲包装系统隔振的下限频率，在一定范围内越厚，隔振效果会越好，但当厚度超过了特定值，隔振效果反而有所下降。

关键词: 泡沫材料刚度阻尼系数振动传递比

DOI：

分类号:TB485.1； TB487

基金项目:国家自然科学基金（10974217）；北京市教委科技发展面上项目（科技教委201008新)；北京市属高等学校人才强教计划资助项目(PHR201107110)

Experimental Research of Influences of Foam Material Thickness on Its Stiffness and Damping Coefficient

FENG Tao, SU Bin, LIU Bin, LI Ya-jun, LI Zhi-wei, WANG Jing

Beijing Technology and Business University, Beijing 100048, China

Abstract:

The experimental system was established according to vibration isolation model; the stiffness and damping coefficient was measured and analyzed. The excitation was exerted by vibration excitation platform; the acceleration was measured by two accelerators and the vibration transfer ratio curve of the cushion packaging system including the foam material was measured; the damping ratio was obtained by applying nonlinear fitting method and then the stiffness and damping coefficient was calculated. The experimental results showed that the stiffness of the foam material descends with its thickness increase; damping coefficient also descends with its thickness increase in the specific scope; with the increase of thickness, the lower limit frequency of cushion packaging system decreases; the more the thickness of the foam material, the better the vibration isolation effectiveness in specific range; however, the vibration isolation effectiveness decreases when the thickness beyond specific value.

Key words: foam material stiffness damping coefficient vibration transfer ratio