作　　者： ; ; ;

机构地区： 东南大学

出　　处： 《中国机械工程》 2009年第6期678-682,共5页

摘　　要： 在全面考虑柔性杆件的剪切变形、弯曲变形和拉压变形的基础上,兼顾计算精度和效率,建立了适用于钳板机构的非线性动力学模型。利用拉格朗日方程和非线性Newmark法,通过与传统线性方法的比较,考察了剪切变形和轴向拉压非线性应变对机构动力响应的影响。分析结果表明:低速时,非线性模型与线性模型的动力响应幅值基本一致;高速时,各种模型的响应幅值相差较大。因此,分析精梳机钳板机构高速时的动态特性时,需要使用非线性动力学模型。 To get a valid dynamics model of nipper mechanism on comber, which determined its dynamic response, the shear deformation, tension-compression deformation, and bending deformation were considered in strain energy. Non-linear factors were retained, including the quartic term of displacement gradient, the cubic term of coupled displacement gradient, and shear deformation, and their effects on dynamic response were studied closely. Comparing to linear approaches in the low-speed range,it is found that the dynamic responses predicted by all approaches make no significant difference,however,in the high-speed range, the approach neglecting the quartic term overestimates the vibration amplitude more than 8-fold and the approach ignoring shear strain underestimates the vibration amplitude almost 3-fold. Therefore, non- linear finite element formulation taking into account the quartic term and shear strain is needed in analyzing high-speed nipper mechanism on comber.

关 键 词： 精梳机 钳板机构 动力学模型 非线性

领　　域： [机械工程]