Study on the Finite Element Simulations of Microspeaker with Recursive Conjugate Feasible Directions Method

• Main Authors: CHANG,EN-TZU, 張恩慈
• Other Authors: LIU, YU-CHENG
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/f3my8k

碩士 === 逢甲大學 === 電聲碩士學位學程 === 106 === With the developments of technologies and intelligence, electro-acoustics devices is not only portable, but also minimized in size and diverse in the applications. Whatever the growths, the kernel of electro-acoustics devices is to build up an exactly and comprehensively simulation system in the driver (microspeaker in this article) with finite element method (FEM). The objective of this article is to build up a systematical simulation model with commercial FEM software--COMSOL Multiphysics. Simulation results are verified with the instruments in the electro-acoustics lab. in Feng Chia University. First, equivalent circuit model (ECM) is created and compared with measurement. FEM simulation model in 2D and 3D, then, are continuously built up with repeated verifications and corrections. Furthermore, SmartDO software with Recursive Conjugate Feasible Directions Method and COMSOL Multiphysics is adopted to improve the difference in higher frequencies. Results shown that the systematical FEM models simulated in 2D and 3D microspeaker are successfully developed. The mechanical properties of diaphragm acquired from the f0 condition not only improve the simulation tendency and accuracy in the lower frequencies, but also up to medium frequencies (< 4 kHz). For higher frequencies, the break-up modes can be also clearly obtained in the frequencies instead of magnitude. In order to make the improvement, this article presented effective radiation area with frequencies (SD()) in ECM and effective Young’s modulus (E()) and loss factor () with frequencies in 3D FEM mode by using SmartDO.