Abstract
The balanced armature receiver (BAR) is a product based on multiphysics that enables coupling between the electromagnetic, mechanical, and acoustic domains. The three domains were modeled using the lumped parameter method (LPM) that takes advantage of an equivalent circuit. In addition, the combined finite element method (FEM) and boundary element method (BEM) was also applied to analyze the BAR. Both simulation results were verified against experimental results. The proposed LPM can predict the sound pressure level (SPL) by making use of the BAR parts dimension and material property. In addition, the previous analysis method, FEM/BEM, took 36 h, while the proposed LPM takes 1 h. So the proposed LPM can be used to check the BAR parts’ dimension and material property influence on the SPL and develop the BAR product efficiently.
Highlights
A new magnetic circuit balanced armature structure transducer has been developed for use in hearing aids [6,7]
In the balanced armature structure transducer, the coil is moved outside the magnetic structure
To predict the sound pressure level (SPL) and develop a new structure balanced armature receiver (BAR) product, lumped parameter method (LPM) is proposed to analyze the performance of the BAR by modeling the electromagnetic, mechanical, and acoustic domains along with their coupling effect according to the modeling dimension and material property, which is defined as the proposed method
Summary
In terms of acoustic transducers, there are the MEMS receiver [1,2], the dynamic receiver [3], the speaker box with passive radiator [4], and the balanced armature receiver [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. To construct the electromagnetic mathematic modeling of the BAR, the lumped parameter method (LPM) was proposed in previous research [12,13] which does not investigate the acoustic domain and cannot predict the SPL result, the key performance criteria of BAR. To predict the SPL and develop a new structure BAR product, LPM is proposed to analyze the performance of the BAR by modeling the electromagnetic, mechanical, and acoustic domains along with their coupling effect according to the modeling dimension and material property, which is defined as the proposed method. The contribution of the paper is that the proposed LPM method makes use of the BAR modeling dimension and material property to predict the SPL result without parameter identification by experiment and is more efficient than the previous method.
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