Vehicle Door Speaker Vibration Isolation
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Solution Overview
Problem
In vehicle door speaker systems, the vibration of the speaker unit's diaphragm causes unnecessary vibration in the door trim, leading to the generation of unwanted sounds.
Innovation Solution
A speaker system design featuring a first panel, a second panel, a third panel, a speaker unit, a first coupling mechanism, and a second coupling mechanism, where the second coupling mechanism is positioned near the center of the second panel to reduce vibration, and an elastic body is used to absorb sound and secure the speaker unit, preventing unwanted sound propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the speaker unit is mounted on the door panel, then the speaker can emit sound toward the vehicle interior, but the vibration of the speaker diaphragm transmits to the door trim causing unwanted vibrations and sounds
Solution Approach 1:
A damping member is introduced as an intermediary component between the speaker unit and the door panel. This damping member absorbs and dissipates the vibrations generated by the speaker diaphragm, preventing them from transmitting to the door trim. The damping member acts as a mediator that allows the speaker to function while blocking the transmission of harmful vibrations.
Solution Approach 2:
The harmful vibration transmission path is separated from the sound emission function. By extracting the vibration isolation function into a separate damping member component, the speaker unit can focus on sound emission while the damping member handles vibration suppression, resolving the contradiction between sound emission and vibration control.
2Stability of the object's composition
If the door trim is rigidly coupled to the inner panel, then the structural stability is improved, but the vibration from the speaker unit is transmitted to the door trim
Solution Approach 1:
The coupling characteristics are made non-uniform across the door panel. In regions away from the speaker unit, the door trim is rigidly coupled to provide structural stability. In the region near the speaker unit, a damping member is introduced to create a localized soft coupling that absorbs vibrations. This local differentiation of coupling quality resolves the contradiction between overall structural stability and local vibration isolation.
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
This design effectively reduces unwanted vibrations and sounds in the door trim, improving sound quality by isolating the speaker unit's vibrations and maintaining sound integrity.
Implementation Method 1
an elastic body is used to absorb sound and secure the speaker unit, preventing unwanted sound propagation
Data Source
AI summary
Disclosed is a speaker system including a first panel that is an outer plate of a vehicle door, a second panel disposed on a vehicle interior side of the vehicle door, a third panel disposed between the first panel and the second panel, a speaker unit that has a sound emitting surface for emitting a sound toward the vehicle interior and is mounted on the second panel or the third panel, a first coupling mechanism that couples a peripheral portion of the second panel to the third panel, and a second coupling mechanism disposed at a position nearer the center of the second panel than a position of the speaker unit in the plane of the second panel and configured to couple the second panel and the third panel in the plane at a position not overlapping with the speaker unit.