Elastomer Foam Damping for Motor Vehicle Floor Vibration Reduction
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Solution Overview
Problem
Existing motor vehicle designs experience increased vibrations due to energy stores being housed under the floor, which can lead to discomfort and potential damage from floor assembly tolerances and vibration amplitudes during vehicle movement.
Innovation Solution
A housing structure for energy stores is fastened to the underside of the floor with a compressible elastomer foam damping component, which is prestressed to absorb vibrations and cover a significant portion of the floor's underside, thereby reducing floor vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If energy stores are housed under the floor in a rigid housing structure, then structural stability is improved, but floor vibrations increase causing discomfort and potential damage
Solution Approach 1:
A damping component is introduced as an intermediary element between the rigid housing structure for energy stores and the floor assembly. This damping component absorbs and dissipates vibration energy, reducing the transmission of vibrations to the floor while maintaining the structural stability provided by the rigid housing.
Solution Approach 2:
The damping component's material properties and geometric parameters are specifically designed and adjusted to optimize vibration reduction. By changing parameters such as damping coefficient, thickness, and material composition, the system achieves effective vibration attenuation while preserving structural integrity.
2Object-affected harmful factors
If a damping component is introduced between the housing and floor, then floor vibrations are reduced, but device complexity increases
Solution Approach 1:
The damping component is implemented as a flexible element that can be integrated into the existing housing structure. This flexible damping layer provides vibration reduction functionality without requiring complex mechanical assemblies, thereby minimizing the increase in device complexity.
Solution Approach 2:
The damping component utilizes composite material structures that combine multiple materials with complementary properties. This approach achieves effective vibration damping in a single integrated component rather than through complex assemblies of multiple parts, thus reducing overall device complexity.
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 solution effectively reduces floor vibrations by up to 90% through adaptive damping, compensating for assembly and production tolerances, and ensuring secure force flow between the housing and floor, enhancing passenger comfort and reducing structural stress.
Implementation Method 1
At least one damping component (7) is advantageously arranged in an intermediate space (28) between the underside (12) of the floor (3) and an outer face (15) of the cover (16) of the housing structure (13)
Implementation Method 2
The damping component is a compressible foam. In one advantageous embodiment, the compressible foam of the damping component is an elastomer foam
Data Source
AI summary
A motor vehicle has a housing for energy storage devices arranged on a lower face of a floor assembly of the motor vehicle such that vibrations of the floor assembly are reduced. At least one damping component is arranged in an intermediate space between the lower face of the floor and an exterior of the cover of the housing structure. The damping component is installed into the intermediate space between the cover of the housing structure and the floor under pre-tension, and the damping component is a compressible foam.