预弯柱体减振器静态特性的尺寸效应

摘要

The size effect of structural dimensions on static mechanics behaviors of isolator with chevron-shaped struts was analyzed by FEM method,and the relationships between plateau-start-force of force/deflection curve and structural dimensions were constructed.Effects of variations of rib-angle,rib-width and rib-height on plateau-start-displacement,plateau-start-force and plateau-length of force/deflection curve were studied respectively.Based on the results of variations of plateau-start-force with structural dimensions,the relationships between plateau-start-force and structural dimensions were investigated:the master curve which is used to describe variation of the plateau-start-force with the ratio of rib-height and rib.width was constructed by introduction of the shift factors of rib-width and rib-an-gle,and described by a parabolic function.The variations of plateau-start-force under the different ribheight and rib..width with rib-angle were calculated by the master curve function and analyzed by the FEA.Comparison between the analyzed and the calculated shoWS the validity of the master curve function.The analyzed results of size effect and the master curve function can provide theoretical direction for designing the isolator.%利用有限元方法分析了预弯柱体减振器的结构尺寸变化对其静态力学性能的影响,建立了预弯柱体减振器的力一位移曲线上平台起始力与结构尺寸之间的联系方程.分别分析了肋斜角、肋宽和肋高对预弯柱体减振器静态压缩变形时力一位移曲线的平台起始位移、平台起始力和平台宽度的影响.根据平台起始力的变化情况,研究了预弯柱体减振器的平台起始力与结构尺寸之间的关系;通过引入肋宽移位因子和肋斜角移位因子,建立了描述平台起始力随肋高与肋宽比变化的主曲线,并用二次方程对主曲线进行表征.对不同肋高和肋宽下平台起始力随肋斜角变化进行了计算和分析.分析和计算结果的对比,表明所建立的主曲线方程能准确地确定不同结构尺寸下预弯柱体减振器的平台起始力.