机构地区: 大连交通大学机械工程学院
出 处: 《机械强度》 2008年第3期400-404,共5页
摘 要: 减振降重设计是结构设计的重要内容之一,优化设计可在设计阶段通过对模型的定量修改,获得理想的减振降重效果。基于有限元直接法计算振动板的频率响应,以板局部厚度为设计变量,计算振动速度对板局部板厚度的灵敏度;以振动板各节点振动速度平方和及重量的加权和最小化为目标,建立减小振动板振动速度和重量的多目标优化数学模型,用可行方向法实现优化设计。以两端固支振动板为研究算例,对其在1Hz~200Hz的振动速度和重量实现多目标优化;当权重系数相同时,各节点的振动速度都得到降低,降低最大值达0.228m/s,同时结构重量减小了46.6N。实例结果表明,优化设计通过对结构重量的重新分布,可在较宽频段内同时减小结构振动和结构重量。 Design of both reducing vibration and reducing weight of structure is an important aspect in design, both given vibration reduction and weight reduction can be achieved by quantitative modification of model in design phase. The frequency response has been calculated by use of FEM(finite element method) direct method and the vibration velocity sensitivity with respect to plate local thicknesses are computed for a plate. An optimization model has been structured, the objective ftmction is the sum of both the sum of the square of vibration velocity and structure weight. Then, an example is given. Results show that optimization design of weight redistribution is of a remarkable effect on both reducing vibration and reducing weight.