Vibration Structure Asymmetric Support Positioning
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Solution Overview
Problem
Vibration structures that include a vibration portion supported by multiple support portions tend to experience bending due to their weight, leading to unwanted bending modes during vibration.
Innovation Solution
A vibration structure comprising a film that deforms in the plane direction when a voltage is applied, a frame-shaped member, support portions, and connection members that position the vibration portion closer to its center of gravity, preventing bending by ensuring it vibrates in the plane direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the vibration portion is supported by multiple support portions, then the structural stability is improved, but the bending mode occurs due to the weight of the vibration portion
Solution Approach 1:
The support portions are positioned asymmetrically relative to the vibration portion, with at least one support portion located closer to the center of gravity than to the end portion. This asymmetric positioning creates a more favorable stress distribution that reduces bending moments while maintaining structural stability.
Solution Approach 2:
The problem is solved by considering the spatial dimension and positioning the support portions at specific locations along the length of the vibration portion. By optimizing the longitudinal position of support portions relative to the center of gravity, the design transforms a two-dimensional support problem into a three-dimensional spatial optimization that eliminates bending modes.
2Ease of manufacture
If the support portion is positioned at the end of the vibration portion, then the ease of manufacture is improved, but the bending mode is likely to occur
Solution Approach 1:
Instead of symmetric or end-positioned support structures that are easy to manufacture but cause bending, the invention uses asymmetric positioning of support portions closer to the center of gravity. This requires slightly more complex manufacturing but eliminates the harmful bending mode.
3Manufacturing precision
If the vibration portion is allowed to bend, then the manufacturing precision requirements are reduced, but the unwanted bending mode occurs during vibration
Solution Approach 1:
The support portions are pre-positioned at optimal locations closer to the center of gravity during manufacturing, which preliminarily establishes the correct stress distribution. This preliminary action prevents bending modes during operation, maintaining both manufacturing simplicity and vibration performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed structure effectively suppresses the bending mode of the vibration portion, reducing unnecessary vibration and associated noise, while allowing stable and long-lasting vibration.
Implementation Method 1
a film constructed to deform in a plane direction as a voltage is applied thereto
Data Source
AI summary
A vibration structure that includes a film constructed to deform in a plane direction as voltage is applied thereto, a frame-shaped member, a vibration portion surrounded by the frame-shaped member in a plan view of the vibration structure, a support portion connecting the vibration portion and the frame-shaped member and supporting the vibration portion within the frame-shaped member, a first connection member that connects the film and the frame-shaped member, and a second connection member that connects the film to the vibration portion such that the vibration portion vibrates in the plane direction when the film is deformed in the plane direction. The support portion is disposed at a position closer to a center of gravity of the vibration portion than an end portion of the vibration portion when viewed in the plan view.