摘要
基于拱形薄壳结构的动力仿真,提出结构振动噪音最小、满足重量约束的约束阻尼厚度优化设计模型.利用K-S函数得到结构的振动加速度级,将其作为结构减振降噪效果的评定参数,采用响应面方法拟合目标函数,并对其进行误差检验,适当缩小设计变量范围调整误差后,响应面曲线的拟合程度较好.最后采用二次规划方法求解模型,经过优化设计,结构第一阶固有频率增加22.97%,振动加速度级值减小12.96%,结构的性能得到了很大提高.
Based on the dynamic simulation of the arch thin shell,an optimal design model for the thickness of the constraint damping layers is proposed for minimizing structural vibration and noise with the weight constraints.The K-S function is adopted to obtain the vibration acceleration level（VAL）,which is used as the evaluation parameter to measure the reduction effect of vibration and noise.The response surface methodology （RSM） is used to fit the VAL.The error testing is used to find a better response surface curve fitting,whose fitting is more accurate by narrowing the scope of the variable appropriately to adjust the errors.After using the Quadratic Programming for the optimization model,the first natual frequency of the structure is increased by 22.97%,the VAL of the structure is reduced by 12.96%,and the whole structure sees a great improvement.
出处
《力学与实践》
CSCD
北大核心
2010年第6期33-38,32,共7页
Mechanics in Engineering
基金
国家自然科学基金项目(10872012)
北京自然科学基金项目(3093019)
大连理工大学工业装备结构分析国家重点实验室基金项目(GZ0819)
校青基金项目(X1001015200801)资助
关键词
减振降噪
响应面
K-S函数
振动加速度级
reducing vibration and noise
the response surface methodology
K-S function
the vibration acceleration level
