幂律流体阻尼的隔冲特性研究

基于幂律流体阻尼特性,建立了单自由度冲击隔离系统数学模型,分析了幂律流体的分段阻尼力特性与隔冲耗能特性,并讨论了速度相关指数、固有频率、冲击载荷幅值等因素对系统隔冲性能的影响。研究结果表明:当激励信号产生的流体相对速度较小时,剪切稀化流体的隔冲性能优于线性阻尼和剪切稠化流体阻尼,流体相对速度较大时,剪切稠化流体的隔冲性能优于线性阻尼和剪切稀化流体。幂律流体的参数影响分析为幂律流体阻尼器的设计和实际应用提供了一定的参考。

Effect of power-law fluid damping in a shock isolation system

Based on damping characteristics of power-law fluid, a mathematical model of single-freedom shock isolation system was established. Segmental damping force characteristics and absorption character-istics of power-law fluid were analyzed. Besides, the numerical analysis related to the effects of these pa-rameters (velocity index, natural frequency and shock excitation amplitude) on shock isolation performance was carried out. The results show that the impact resistance performance of shear thinning fluid shock iso-lation system is better than the linear damping and shear thickening fluid shock system at the lesser rela-tive velocity. The impact resistance performance of shear thickening fluid shock isolation system is better than the linear damping and shear thinning fluid shock system at the biggist relative velocity. The paramet-ric influence analyses of the power-law fluid provide a feasible theoretical basis for the design and appli-cation of the power-law fluid damper.