Dual-Chamber Hollow Profile Energy Absorption Element
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Solution Overview
Problem
In motor vehicles, existing cavities used as resonance volumes for sound generators often compromise between safe impact characteristics and acoustically optimal design, as they cannot simultaneously provide both effective sound propagation and impact safety.
Innovation Solution
A dual-chamber hollow profile energy absorption element with elongated cavities open at both ends, designed to maintain safe deformation characteristics while serving as a resonance chamber, featuring a constant cross-sectional profile with separate chamber cavities that are fluidly connected to sound generators, allowing for adjustable resonance frequencies and mechanical impact behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If existing cavities in the support frame are used as resonance volumes, then the acoustic performance is improved, but the impact safety and deformation characteristics are compromised
Solution Approach 1:
The support frame is divided into multiple separate cavities (first cavity and second cavity) that are mutually separated by a partition wall. Each cavity can function independently as a resonance volume, allowing the acoustic system to utilize multiple discrete spaces rather than requiring a single large cavity, thereby maintaining acoustic performance while preserving the structural integrity needed for impact safety.
Solution Approach 2:
Different regions of the support frame are assigned different functions: certain cavities are optimized for acoustic resonance while other portions of the structure maintain their original load-bearing and impact-absorption characteristics. The partition wall creates localized acoustic chambers without compromising the overall structural strength of the support frame.
2Illumination intensity
If the cavity size is increased to provide better resonance volume, then the acoustic performance is improved, but the structural strength and deformation characteristics are worsened
Solution Approach 1:
Instead of using one large cavity that would compromise structural strength, the design segments the acoustic volume into multiple smaller cavities. These distributed smaller cavities collectively provide sufficient resonance volume for acoustic performance while being distributed throughout the structure in a way that preserves overall structural strength and deformation characteristics.
Solution Approach 2:
The acoustic cavities are nested within the existing support frame structure, utilizing the available structural space efficiently. The cavities are integrated into the frame geometry rather than adding external volume, allowing the structure to maintain its strength-to-volume ratio while providing adequate resonance space for acoustic elements.
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 enables the use of vehicle support structure cavities as both safe impact zones and efficient resonance volumes, maintaining mechanical integrity and sound quality by optimizing deformation characteristics and resonance frequencies within the 0-200 Hz range.
Implementation Method 1
the resonance volume is at least partially limited by a bottom plate of the motor vehicle and includes a cavity in a rocker panel
Implementation Method 2
its cross-sectional profile is designed as a hollow profile which remains constant along a longitudinal direction of the energy absorption element
Data Source
AI summary
The approach relates to an energy absorption element for a support frame of a motor vehicle and is characterized in that a cross-sectional profile is designed as a hollow profile which remains constant along a longitudinal direction of the energy absorption element having at least two closed chambers, so that the energy absorption element comprises at least two mutually separate chamber cavities and the at least two chamber cavities have an elongated shape along the longitudinal direction of the energy absorption element and each chamber cavity is open at two longitudinal ends of the energy absorption element and each chamber cavity is fluidly connected to a sound generator.