阻尼溶剂抽取法中关键因素取值优化模型

发布时间：2018-03-18 19:23

  本文选题：结构-地基相互作用　切入点：人工阻尼系数　出处：《振动工程学报》2017年02期 　论文类型：期刊论文

【摘要】：阻尼溶剂抽取法中关键因素包括人工阻尼系数和有限区域尺寸等,对结构-地基相互作用的分析计算有很大的影响。为消除关键因素取值随机性对计算结果的影响、有效控制交界面相互作用计算结果的精确度和计算效率,分析了弹性地基上杆件在不同状态下无量纲动力刚度系数间的相互关系,构建了关键因素取值优化模型。无量纲有限区域大小与人工阻尼系数的函数关系式定义为目标函数,无阻尼无限杆近似计算与解析计算的动力刚度系数差值函数定义为约束条件。已知偏移允许最大值和节点振动幅值衰减目标值,解得无阻尼无限杆近似计算动力刚度系数中关键因素的最优取值。数值算例验证了关键因素取值优化模型及求解方法是合理可行的,能够有效控制模拟计算的精确度和计算效率,亦验证了该模型的工程适用性。
[Abstract]:The key factors of damping solvent extraction method include artificial damping coefficient and finite area size, which have great influence on the analysis and calculation of structure-foundation interaction. The accuracy and efficiency of the calculation results of interface interaction are effectively controlled, and the relationship between dimensionless dynamic stiffness coefficients of members on elastic foundation under different conditions is analyzed. The optimization model of the key factors is constructed. The function relation between the dimensionless finite region size and the artificial damping coefficient is defined as the objective function. The difference function of dynamic stiffness coefficient between approximate calculation and analytical calculation of undamped infinite rod is defined as constraint condition. The maximum allowable offset and the attenuation target value of nodal vibration amplitude are known. The optimal value of the key factors in the dynamic stiffness coefficient is obtained by solving the undamped infinite rod approximation. The numerical example shows that the optimization model and the solution method for the key factors are reasonable and feasible. It can effectively control the accuracy and efficiency of the simulation calculation, and verify the engineering applicability of the model.
【作者单位】： 河海大学水利水电学院;
【基金】：国家自然科学基金资助项目(51279053)
【分类号】：TU435
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本文编号：1630962