Abstract
Horizontally vibrating linear actuator (HVLA) instead of VVLA has been under study in a few past years and recently HVLA with thickness of 2.5 mm was developed. The one-folded leaf spring to guide the moving part is newly designed and applied in HVLA, but unfortunately it makes HVLA be wider. Accordingly, this paper presents the optimal design of one-folded leaf spring, which results in reduction of HLVA width. The commercial design optimization tool “PIAnO” was utilized based on design of experiments (DOE), approximation techniques, and optimization algorithm. In addition, for the vibration modal analysis and harmonic response analysis to generate metamodeling, the software “ANSYS” is utilized. The optimal width of leaf spring was reduced by 46% compared to the initial one, while all the design constraints were satisfied, which clearly showed the validity of the proposed design approach.
Highlights
The slimming of a smart phone has become a competitive issue in the smart phone industry because the display panel is enlarged to show more information to the user
A horizontally vibrating linear actuator (HVLA) has been developed in recent years, but it has not been commercialized in the smart phone industry so far [2]
In our results for the optimal design using the metamodel (Opt meta), the optimal design satisfied the constraints, including the maximum stress and natural frequency of first mode, and the width of one-folded leaf spring decreased by 47% compared to the initial width of 1.9 mm
Summary
The slimming of a smart phone has become a competitive issue in the smart phone industry because the display panel is enlarged to show more information to the user. One of the thickest components is vibrating actuator which imposes the restrictions on the slimming of smart phones. It imposes the thickness problem on a smart phone, because it needs vibration space in the vertical direction [1]. A horizontally vibrating linear actuator (HVLA) has been developed in recent years, but it has not been commercialized in the smart phone industry so far [2].
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