Speaker Box Elastic Cover Plate Resonance Control
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Solution Overview
Problem
The existing speaker boxes suffer from resonance issues due to the close resonant frequency of steel plates matching the working frequency range, leading to decreased frequency response performance and distortion.
Innovation Solution
A speaker box design incorporating an elastic cover plate with a lower Young's modulus than the housing, specifically made of materials like TPU or silica gel, which is strategically positioned to absorb resonant frequency energy and reduce resonance peaks, thereby improving acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel plate cover is used to cover the through hole, then the structural strength and rigidity of the speaker box is improved, but the resonant frequency of the cover plate matches the working frequency range causing resonance and distortion
Solution Approach 1:
The patent changes the material parameter of the cover plate from steel (high Young's modulus) to elastic material (low Young's modulus). This parameter change shifts the resonant frequency of the cover plate away from the speaker's working frequency range, eliminating resonance and distortion while maintaining adequate structural strength through the elastic material properties.
Solution Approach 2:
The patent uses composite material construction where the cover plate is made of elastic material (such as rubber or plastic) rather than pure metal. This composite approach combines the flexibility needed to avoid resonance with sufficient structural integrity to maintain the speaker box's mechanical strength.
2Manufacturing precision
If a rigid steel plate cover is used, then the manufacturing precision and structural stability is improved, but the frequency response performance deteriorates due to resonance
Solution Approach 1:
The patent modifies the physical parameter of the cover plate material from rigid steel to elastic material, changing the Young's modulus and damping characteristics. This enables the cover to absorb vibrational energy and suppress resonance peaks, improving frequency response performance while elastic materials can still be manufactured with adequate precision using conventional processes.
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 elastic cover plate effectively absorbs resonant energy, reducing distortion and enhancing the speaker box's frequency response and acoustic performance by adjusting its resonant frequency to specific ranges, as shown in the frequency and total harmonic distortion curves.
Implementation Method 1
the resonant frequency of the steel plate and the working frequency range of the speaker box are close to each other, when the speaker box works, resonance is easy to be produced in the steel plate
Implementation Method 2
an elastic cover plate covering the through hole, the Young's modulus of the elastic cover plate is smaller than that of the upper cover, wherein, the elastic cover plate absorbs resonant frequency energy
Data Source
AI summary
A speaker box includes a housing; a speaker unit accommodated in the housing, the speaker unit including a diaphragm for vibration and sound producing; a front sound cavity formed cooperatively by the diaphragm and the housing; a sound guiding channel communicating the front sound cavity with external environment; a front cavity formed by the front sound cavity and the sound guiding channel; a through hole penetrating the housing and disposed at a position on the housing corresponding to the front cavity; and an elastic cover plate arranged on a side of the housing far from the speaker unit and covering the through hole for absorbing vibration energy at a specific frequency. A Young's modulus or strength of the elastic cover plate is smaller than that of the housing.