中文摘要：

为了增大超磁致伸缩式骨导发音振子的输出位移以保证耳听器拥有足够的发声强度,提出了一种弓张式的位移放大机构,通过理论推导和有限元方法建立了弓张结构的分析模型,并得到了在各自模型下弓张结构的位移放大比随弯曲角度α的变化曲线,通过对比分析得知当α〉5°时,理论模型与仿真模型具有良好的重合度,并且当α=5°时弓张结构能够获得最大的位移放大比。在上述模型的基础上,通过有限元静力学分析进一步对弓张结构的截面尺寸进行了优化,得到弓张结构的厚度和高度的最优尺寸分别为9mm和0.5mm,实验结果验证了耳听器结构设计的正确性。

英文摘要：

A bow-type displacement amplification structure is proposed in order to increase the output displacement of the bone-conduction pronunciation vibrator to ensure the enough sound intensity of the earphone.The analytical models of the structure are established by the theoretical derivation and finite element method.And the curve of amplification ratio along with the change of bending angle a under the respective model is obtained.Through comparative analysis,we know that the theoretical model and simulation model has good coincidence degree when α5o,and the ratio will be biggest when α=5o.On the basis of the model,the section size is optimized through the finite element static analysis,and the best size is b=0.5 mm,t=9 mm.The results are verified through experiments.