Parcel Shelf Stiffeners for Speaker Vibration Control
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Solution Overview
Problem
Current speaker mounting systems in vehicles, particularly on parcel shelves, fail to adequately support higher-power speakers, leading to vibration and reduced sound quality due to insufficient structural rigidity.
Innovation Solution
The implementation of a vehicle speaker mounting system that includes longitudinal stiffeners along the parcel shelf to increase rigidity, combined with apertures and fasteners for secure speaker attachment, which reduces vibration and enhances sound output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If speakers are mounted to a single layer sheet steel parcel shelf, then the parcel shelf can hold speakers in position, but the speaker body moves or vibrates during operation
Solution Approach 1:
The parcel shelf is segmented into multiple layers with intermediate stiffeners positioned between speaker apertures. These stiffeners divide the single-layer structure into a multi-layer construction, creating separate structural elements that work together to reduce speaker vibration while maintaining position stability.
Solution Approach 2:
The parcel shelf transitions from a single material (sheet steel) to a composite structure consisting of multiple sheet layers interconnected by stiffeners. This composite construction provides enhanced rigidity and vibration damping properties while maintaining the structural integrity needed to hold speakers securely.
2Reliability
If higher-power woofer or subwoofer speakers are installed, then sound quality can be improved, but the parcel shelf cannot adequately support the speakers and prevent movement or vibration
Solution Approach 1:
The parcel shelf structure is segmented with intermediate stiffeners positioned between speaker apertures, creating a multi-layer construction that provides enhanced support for high-power speakers. This segmentation allows the structure to distribute vibration forces across multiple elements rather than allowing the entire shelf to resonate.
Solution Approach 2:
The parcel shelf transitions from a two-dimensional single-layer sheet to a three-dimensional multi-layer construction with intermediate stiffeners extending between the layers. This dimensional change creates a more rigid structure capable of supporting the strong vibrations generated by higher-power woofer and subwoofer speakers.
3Ease of manufacture
If speakers are mounted to a single layer parcel shelf, then installation is simple, but vibration generates unwanted noise and loosens nearby fasteners
Solution Approach 1:
The parcel shelf is segmented into multiple layers with intermediate stiffeners, creating a more complex but still manufacturable structure. This segmentation provides vibration damping that reduces unwanted noise and prevents fastener loosening while maintaining reasonable ease of manufacture through standardized assembly processes.
Data Source
AI summary
A vehicle speaker mounting system. The vehicle speaker mounting system comprises a parcel shelf having at least one stiffener extending substantially longitudinally along the length of the parcel shelf. The system further includes at least one aperture extending through a generally planar portion of the parcel shelf. The aperture is configured to receive a speaker.