【作者】 张利亚；

【导师】 张文志； 许秀梅；

【作者基本信息】 燕山大学 ， 机械设计及理论， 2008， 硕士

【摘要】 有限单元法是在当今工程分析中获得最广泛应用的数值计算方法。该分析软件ANSYS能够同时进行结构、热、流体、电磁、声学的高级多物理场耦合分析。ANSYS软件的目标设计优化模块应用的基本原理是:采用曲线拟合的方法,通过复杂的二次方程式形式人为的形成目标函数及约束函数的近似函数表达式,目标函数和约束函数的系数采用加权最小二乘法,通过误差来确定,再利用各种优化方法,通过优化迭代,得到目标函数的极值。本文以Y型轧机轧制铝材为基本实体模型,根据前人的研究成果及作者的探索,计算相应的平均单位压力,确定边界约束条件,应用参数化建模在ANSYS中进行轧辊静力分析;生成优化分析文件,应用ANSYS优化方法通过加权对轧辊尺寸分别进行单目标和多目标优化设计,得出优化过程中的等效应力和位移变化曲线及云图;应用模糊数学中一级综合评判确定优化最好的一组方案。以三维立体软件Pro/E为平台,对其进行实体建模,并以ANSYS中的动力学模块LS-DYNA为分析工具,对轧制铝材进行模拟,得出轧制过程中轧制变形区的应力、应变的分布情况。并将模拟后的位移变形与优化过程中得到的结果进行比较,验证其计算精度。更多还原

【Abstract】 The finite element method is the most widely used numerical calculation in today’s engineering analysis.The analysis software ANSYS can simultaneously carry on the structural, thermal, fluid, electromagnetic, acoustic and more senior physics field coupling analysis. The basal principle that the software’s objective design optimization module applies is as follows. Adopting the curve fitting method and complex quadratic equation to form man-made the approximative function expression about objective function and constraint function, modulus of functions is determined through error by the weighted least squares method.then through iterative optimization by make use of various optimization method to obtain the objective function extremum.The dissertation use Y rolling mill rolling aluminum as entity model. Based on the research production of predecessor and investigation of the author, corresponding rolling force and boundary constraints are determined. Then build a parametric model in the ANSYS to perform the static analysis. Roller is optimized through multi-objective optimization method, we obtain nephograms of stress and displacement curves from optimization process. Comprehensive evaluation of fuzzy math is applied to identify the best optimization program.The three-dimensional models of rolling are established with Pro/E. Based on the dynamics module LS-DYNA, the procedure of rolling aluminum is simulated. The nephograms of stress and strain of rolling deformed area and the curve of roll force during rolling are obtained. Compared the result with the other result which comes from optimization, the precision of calculation will be verified.更多还原