扬声器辐射体旋转薄壳的谐波失真  

Harmonic distortion of loudspeaker revolution shells

作　　者：张志良[1] 胡秀青[2] 

机构地区：[1]浙江师范大学物理系,浙江321004 [2]浙江师范大学图文信息中心,浙江321004

出　　处：《声学学报》2016年第5期638-644,共7页Acta Acustica

基　　金：国家自然科学基金项目(11174255;11304286)资助

摘　　要：研究了扬声器辐射体旋转薄壳几何非线性引起的谐波失真。采用摄动法和有限元法确定了2次和3次谐波振型,计算了薄壳材料参数和几何参数对谐波失真的影响。结果表明扬声器薄壳谐波失真的机制是分割振动模态的基波共振和超谐波共振,以基波共振为主。采用高阻尼、大杨氏模量和低密度的振膜材料可以降低振膜谐波失真;厚度对谐波失真的峰值影响不大;锥壳半顶角过大,可使3次谐波明显增大。The harmonic distortion caused by the geometric nonlinearity of loudspeaker shells is investigated. The second-order and third-order harmonic vibration patterns are determined by the method of multiple scales and the finite element method. It is shown that the harmonic distortion is caused by the primary resonance and superharmonic resonance of the break-up modes of loudspeaker shells. The influences of material and geometry parameters of loudspeaker shell on the harmonic distortions are studied. Shell materials with high damping, high strength and low density can lower the harmonic distortions. The thickness of the shell has little effects on the harmonic crest values. The third-order harmonic distortion increases evidently for a conical shell with an overlarge semiapex angle.

关 键 词：谐波失真 旋转薄壳 扬声器 辐射体 超谐波共振 振膜材料 几何非线性 有限元法 

分 类 号：TN643[电子电信—电路与系统]