基于模态应变能的扬声器盆架优化  

Optimization of Loudspeaker Basin Based on Modal Strain Energy

作　　者：王正兴 彭芳梅 谢守华 Wang Zhengxing;Peng Fangmei;Xie Shouhua

机构地区：[1]国光电器股份有限公司,广州510800 [2]广东省电声电子技术研发与应用企业重点实验室,广州510800

出　　处：《机械制造》2024年第3期61-66,97,共7页Machinery

摘　　要：针对扬声器轻量化及结构刚度、强度较高要求的设计目标,通过有限元方法进行模态及谐响应分析,对扬声器盆架低频模态应变能集中位置进行优化。优化后,一阶频率由547.3 Hz提高至995 Hz。网格迭代后,一阶频率提升至1031.6 Hz,且模态应变能趋于均匀分布。对应变能较小且非集中的区域进行轻量化优化,通过最小柔度方法对开窗区域进行拓扑优化,在中间部分质量减小40%的情况下,使一阶频率由1300.5 Hz提高至1386.6 Hz,同时使刚性提高。对0.6 mm、0.8 mm、1 mm厚度的扬声器盆架进行对比,从刚度、加速度两个维度进行验证。在有限元分析的基础上,对试验后产生严重变形的扬声器盆架进行基于模态应变能的实际优化,优化后一阶频率由1290.8 Hz提高至1755.9 Hz,同时刚性增大,应变能分布更均匀,变形得到改善。In order to realize the design goal of lightweight,high structural stiffness and high strength of the loudspeaker,modal and harmonic response analyses were carried out by using the finite element method to optimize the distribution poisition of low frequency modal strain energy of the loudspeaker basin.After optimization,the first order frequency was increased from 547.3 Hz to 995 Hz,and after grid iteration,the first order frequency was increased to 1031.6 Hz and the modal strain energy tended to be uniformly distributed.The lightweight optimization was performed on the region with smaller and non concentrated strain energy,and the topology optimization was carried out by using the minimum flexibility method at the open window region.The first order frequency was further increased from 1300.5 Hz to 1386.6 Hz with a 40%mass reduction of the intermediate part,and simultaneously the rigidity was improved.The loudspeaker basins with thicknesses of 0.6 mm,0.8 mm,and 1 mm were compared and verified in terms of stiffness and acceleration.Moreover,a practical optimization based on modal strain energy was performed on the loudspeaker basin that encountered severe deformation after test by using finite element analysis.The first order frequency was increased from 1290.8 Hz to 1755.9 Hz after the optimization.In the meanwhile,the rigidity was increased,the strain energy was distributed more uniformly,and the deformation was better.

关 键 词：扬声器 盆架 模态应变能 优化 

分 类 号：TN643[电子电信—电路与系统]