Vehicle Door Loudspeaker Housing Using Door Cavity Resonance
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Solution Overview
Problem
Current door assemblies with loudspeakers in vehicles fail to effectively reduce external background noise, such as tire rolling noise, which interferes with the acoustic function of the loudspeaker, leading to increased costs and complexity due to the need for large enclosed housings to block noise.
Innovation Solution
A door assembly design featuring a loudspeaker housing with at least one opening that communicates with an intermediate space, acting as a resonance volume, to attenuate background noise while allowing the loudspeaker to function optimally without the need for a large housing, by positioning the opening in a way that deflects and reduces noise energy before it reaches the loudspeaker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the loudspeaker is covered by an enclosed housing to block background noise, then background noise reduction is improved, but the housing size must be large and costs increase
Solution Approach 1:
The intermediate space between the inner and outer door elements serves dual purposes: it acts as both the mounting location for the loudspeaker and as a resonance volume to enhance acoustic performance. This eliminates the need for a separate enclosed housing, reducing both size and cost while maintaining noise reduction benefits.
Solution Approach 2:
The patent combines the loudspeaker housing function with the door assembly structure itself. The loudspeaker is mounted directly in the intermediate space, and the door elements themselves provide the acoustic enclosure, merging multiple functions into a single integrated structure rather than requiring separate components.
2Object-affected harmful factors
If the loudspeaker is covered by an enclosed housing to block background noise, then background noise reduction is improved, but assembly costs and complexity increase
Solution Approach 1:
The patent merges the loudspeaker housing with the door assembly structure, eliminating separate housing components and reducing the number of assembly steps. The loudspeaker is directly mounted in the intermediate space, and the door elements provide the acoustic enclosure, simplifying both design and manufacturing.
Solution Approach 2:
The door assembly structure serves multiple functions: it provides the mechanical door structure, the acoustic enclosure, and the resonance volume for the loudspeaker. This multi-functionality reduces the need for additional specialized components and simplifies the overall assembly process.
3Object-affected harmful factors
If a large enclosed housing is used to block background noise, then background noise reduction is improved, but the loudspeaker acoustic function is compromised by the large size requirement
Solution Approach 1:
The intermediate space serves dual purposes as both the loudspeaker mounting location and the resonance volume. This eliminates the need for a separate large enclosed housing, allowing effective noise reduction without requiring excessive housing dimensions.
Solution Approach 2:
The patent changes the acoustic parameters by utilizing the intermediate space as a resonance volume, which enhances the loudspeaker's acoustic output. This allows the system to achieve effective noise reduction and acoustic performance without requiring a large physical housing structure.
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 external noise input to the passenger compartment, optimizing the loudspeaker's acoustic performance while minimizing assembly costs and complexity by using the intermediate space as a resonance volume and strategically orienting openings to deflect noise.
Implementation Method 1
the intermediate space can be used as a resonance volume for the loudspeaker
Data Source
AI summary
A door assembly of a vehicle includes an outer door element, an inner door element, a loudspeaker, and a loudspeaker housing. The loudspeaker housing is arranged in an intermediate space between the inner door element and the outer door element and covers the loudspeaker. The loudspeaker housing also has at least one opening which communicates with the intermediate space, such that the intermediate space can be used as a resonance volume for the loudspeaker.