Speaker Box Elastic Cover Plate Resonance Absorption
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Solution Overview
Problem
The rigid walls in existing speaker boxes lead to resonance and sound distortion due to limited energy transmission and absorption of specific frequencies, affecting acoustic performance.
Innovation Solution
The use of an elastic cover plate with a lower Young's modulus than the housing, positioned in the sound guiding channel, to absorb resonance frequency energy and reduce distortion by vibrating at specific frequencies, thereby improving acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid walls are used in the front cavity, then structural strength is improved, but resonance and sound distortion occur due to limited energy absorption
Solution Approach 1:
The patent replaces rigid wall materials with flexible or elastic materials having lower Young's modulus in the front cavity structure. This allows the cavity walls to vibrate and absorb acoustic energy at resonance frequencies, converting harmful resonance into useful energy dissipation while maintaining structural integrity.
Solution Approach 2:
The patent changes the physical parameters of the cavity walls by selecting materials with different mechanical properties (lower Young's modulus, higher damping capacity). This parameter change enables the walls to absorb acoustic energy through vibration rather than reflecting it, thereby reducing resonance peaks and distortion.
2Manufacturing precision
If rigid plastic or metal material is used for housing walls, then manufacturing precision is improved, but acoustic performance deteriorates due to resonance
Solution Approach 1:
The patent employs composite material structures combining rigid components (for structural strength and manufacturing precision) with flexible or elastic materials (for acoustic energy absorption). This composite approach maintains dimensional stability and manufacturing precision while introducing damping characteristics to improve acoustic performance and eliminate resonance.
3Ease of manufacture
If rigid walls are used, then ease of manufacture is improved, but energy absorption capability is reduced leading to resonance
Solution Approach 1:
The patent introduces flexible or elastic wall materials that can be manufactured using standard molding techniques. These materials inherently provide energy absorption through their viscoelastic properties, allowing the structure to dissipate acoustic energy as heat through internal friction during vibration, thus improving energy absorption without significantly complicating manufacturing.
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 reduces resonance peaks and distortion, enhancing the speaker box's frequency response and harmonic distortion curves, leading to improved acoustic performance by absorbing energy at specific frequencies.
Implementation Method 1
the elastic cover plate is used for absorbing the resonance frequency energy
Implementation Method 2
to vibrating at specific frequencies, thereby improving acoustic performance
Implementation Method 3
absorbing the resonance frequency energy of a specific frequency, thus weakening the resonance effect
Implementation Method 4
The elastic cover plate is used for absorbing the resonance frequency energy
Implementation Method 5
an elastic cover plate with a lower Young's modulus than the housing
Data Source
AI summary
A speaker box includes a housing with an accommodating space and a housing wall; a propping wall extending from the housing wall toward the accommodating space; and a speaker unit located between the housing wall and the propping wall for dividing the accommodating space into a front cavity and a back cavity. The speaker unit includes a diaphragm located in the front cavity for forming a front sound cavity cooperatively with the housing, a sound guiding channel communicating the front sound cavity with outside, and a through hole penetrating the propping wall and communicating the sound guiding channel with the back cavity. The speaker box further includes an elastic cover plate covering the through hole completely for absorbing vibration energy at a specific frequency. The Young's modulus or strength of the elastic cover plate is smaller than that of the propping wall.