基于声功率灵敏度的结构拓扑优化设计
发布时间：2018-11-16 20:25
【摘要】：针对工程中普遍存在的薄板结构振动噪声问题,提出了一种对加强筋位置分布进行拓扑优化的控制方法。通过有限元动力学分析结构的速度响应,代入由声辐射模态推导的声功率求解方程中得到声功率。建立以加强筋位置作为设计变量的拓扑优化数学模型,寻找声功率最小的加筋分布。算法中以声辐射模态灵敏度为指导,确定拓扑优化加筋的起始点和搜索过程。通过仿真计算结果表明,优化得到的加筋布局能有效地将声功率降低7.38dB,并讨论了收敛准则和不同频率对加筋布局的影响,在第一阶固有频率内都可用此种算法优化。
[Abstract]:Aiming at the vibration and noise problem of thin plate structure in engineering, a topology optimization control method for the position distribution of stiffeners is proposed. The velocity response of the structure is analyzed by finite element dynamics, and the sound power is obtained by replacing the acoustic power equation derived from the acoustic radiation mode. A mathematical model of topology optimization with reinforcement position as design variable is established to find the reinforcement distribution with the smallest sound power. Under the guidance of acoustic radiation mode sensitivity, the starting point and searching process of topology optimization reinforcement are determined. The simulation results show that the optimized stiffened layout can effectively reduce the sound power by 7.38 dB, and discuss the convergence criterion and the influence of different frequencies on the stiffened layout, which can be optimized in the first order natural frequency.
【作者单位】： 江苏大学振动噪声研究所;
【分类号】：TB535
[Abstract]:Aiming at the vibration and noise problem of thin plate structure in engineering, a topology optimization control method for the position distribution of stiffeners is proposed. The velocity response of the structure is analyzed by finite element dynamics, and the sound power is obtained by replacing the acoustic power equation derived from the acoustic radiation mode. A mathematical model of topology optimization with reinforcement position as design variable is established to find the reinforcement distribution with the smallest sound power. Under the guidance of acoustic radiation mode sensitivity, the starting point and searching process of topology optimization reinforcement are determined. The simulation results show that the optimized stiffened layout can effectively reduce the sound power by 7.38 dB, and discuss the convergence criterion and the influence of different frequencies on the stiffened layout, which can be optimized in the first order natural frequency.
【作者单位】： 江苏大学振动噪声研究所;
【分类号】：TB535
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