2014
DOI: 10.1007/s12206-014-0307-z
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Design of microspeaker module considering added stiffness

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Cited by 11 publications
(6 citation statements)
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“…All the contributions of acoustic behaviors could reduce the stiffness of the loudspeaker system, that is, decrease the elastic coefficient, or increase the acoustic compliance of the loudspeaker, and then reduce the resonant frequency of this system. 6,13,33 Furthermore, to investigate the correlation between resonant frequency and filling materials, we compared mesoporous silica microspheres (MCM) composited with SBA-15s (pure mesoporous materials synthesized in our previous work 13 ) and nonporous materials (Figure S9, Supporting Information, Synthesis) with ZSM-5 GR-cal. The results reveals that in addition to nonporous materials, the mesoporous (2−50 nm) materials and microporous (<2 nm) materials have the ability to reduce the resonance frequency, in which micropores play a dominant role.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
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“…All the contributions of acoustic behaviors could reduce the stiffness of the loudspeaker system, that is, decrease the elastic coefficient, or increase the acoustic compliance of the loudspeaker, and then reduce the resonant frequency of this system. 6,13,33 Furthermore, to investigate the correlation between resonant frequency and filling materials, we compared mesoporous silica microspheres (MCM) composited with SBA-15s (pure mesoporous materials synthesized in our previous work 13 ) and nonporous materials (Figure S9, Supporting Information, Synthesis) with ZSM-5 GR-cal. The results reveals that in addition to nonporous materials, the mesoporous (2−50 nm) materials and microporous (<2 nm) materials have the ability to reduce the resonance frequency, in which micropores play a dominant role.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…To explore the acoustic effects of ZSM-5 GR-cal as a filling material, a platform was set up for evaluating the low frequency of a 1.0 cm 3 enclosed-box microloudspeaker with either empty or filled with filling materials (Figure S6). The vibrational characteristics of a microloudspeaker, modeled as a mass-spring system with a moving mass (speak unit) and an acoustic spring, contributed by the air inside the enclosure, are affected by total stiffness consisting of unit stiffness from vibration components and acoustic spring stiffness. ,, Generally, in terms of vibration and acoustic analysis, the unit stiffness and added stiffness act in parallel on the vibration system . Since a microloudspeaker is driven by Lorentz force that is affected by the induced electromotive force (back emf), the acoustic vibration characteristics of the entire system can be described by the magnitude of the electrical impedance.…”
Section: Results and Discussionmentioning
confidence: 99%
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“…However, the LEM is not sufficient to model higher order resonant modes and incapable to well predict the high frequency responses of MEMS speakers. Therefore, LEM is often used together with FEA to calculate the dynamic responses [ 5 , 44 , 48 ], analyze the enclosure designs [ 45 , 49 ], and optimize the diaphragm structural designs.…”
Section: Theory and Modeling Of Mems Speakersmentioning
confidence: 99%
“…A magnet with a larger volume, or a higher magnet grade, is usually used to improve the acoustic performance of a miniaturized microspeaker module [1][2][3], and results in a higher flux leakage as well. The arrangement of a microspeaker in a mobile phone is shown in Fig.…”
Section: Introductionmentioning
confidence: 99%