Optimization The Acoustical Performance Of The Miniature Loudspeaker Drivers And Systems

With the rapid development of the consuming electronics industry,the miniature loudspeaker drivers and systems have been more and more widely used.The consumers'demands for the products with high acoustical properties has been increased with the development of the industry and it promotes engineers to optimize the acoustical performance of the miniature loudspeaker drivers and systems.This paper is based on simulations.Firstly,we establish accurate simulation models of miniature loudspeaker drivers and systems using the lumped parameter method and the finite element method.Then,we presents a new calculation method to calculate the material parameters of the miniature loudspeakers' vibration parts.Based on these,several kind of optimization theories have been used to optimize the acoustical performance of the miniature loudspeaker drivers and systems.On this basis,the optimization design methods for the design of miniature loudspeakers has been explored and the design guidance has been given.The main content of this paper can be divided into three parts:In the first part of this paper,accurate simulation models of miniature loudspeaker drivers and systems are established using the lumped parameter method and the finite element method.Then a typical miniature loudspeaker driver is simulated using the lumped-parameter model and the finite element method respectively.Then,a new calculation method to calculate the material parameters of the miniature loudspeakers'vibration parts is presented.The material parameters are derived using the genetic algorithm by comparing the measured data and the computed data.In the second part,based on the accurate material parameters and the simulation model,the response surface method is used to optimize the design of each component of the miniature loudspeaker,in order to improve the acoustic performance of the miniature loudspeakers and to explore how the components effect the acoustic performance of the miniature loudspeakers.The main components including the magnet parts,the diaphragm and the corrugations of the diaphragm are optimized to improve the acoustic performance of the miniature loudspeakers.The third part focuses on the analysis of the nonlinear characteristics of air stiffness in a closed miniature loudspeaker system and the optimization of the closed miniature loudspeaker system considering the nonlinear air stiffness.The theoretical formula of the nonlinear air stiffness is derived.From the point of view of experiment and simulation,the nonlinear air stiffness is explored under the condition of large signal and the results are compared to the theoretical calculation results.In consideration of the nonlinear air stiffness,the total stiffness of the closed-box system is optimized by using different miniature loudspeakers with different stiffness to improve the acoustic performance of the closed-box miniature loudspeaker systems.Along with the development of the industry and science and technology progress,people's pursuit of good acoustical quality will continue to promote the improvement of acoustic performance of the miniature loudspeakers.The research on the optimization of the acoustic performance of the miniature loudspeakers is of great importance.