Composite Drive Shaft Damper NVH Reduction
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Solution Overview
Problem
Existing drive shaft dampers fail to effectively reduce noise, vibration, and harshness (NVH) in vehicles, particularly in specific drive shafts, leading to a need for improved NVH reduction technologies.
Innovation Solution
A composite drive shaft damper is developed, incorporating both foamed and non-foamed NVH-reducing materials secured to the exterior and/or interior surfaces of a cylindrical structure, such as a paperboard tube, to provide enhanced NVH reduction by using elastomeric foam and heat-resistant silicone rubber retaining members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional single-material dampers are used, then the structure is simple, but the NVH reduction effectiveness is insufficient
Solution Approach 1:
The patent applies composite materials by combining foam material and non-foamed elastomeric material in a single damper structure. The foam material provides damping for certain frequency ranges while the non-foamed elastomeric material addresses different frequency ranges, creating a multi-frequency NVH reduction capability that neither material could achieve alone.
Solution Approach 2:
The damper is segmented into distinct foam and non-foamed regions, each optimized for specific NVH frequency ranges. This segmentation allows each material to target particular vibration modes independently, improving overall NVH reduction effectiveness while maintaining a manageable structural complexity through modular design.
2Temperature
If foam material is used alone, then the damper provides good damping, but it lacks heat resistance and structural stability at high temperatures
Solution Approach 1:
The patent applies local quality by placing non-foamed elastomeric material in regions requiring heat resistance and structural stability, while using foam material in regions where maximum damping is needed. This spatial differentiation of material properties allows the damper to simultaneously achieve heat resistance and effective damping across different operational conditions.
3Object-affected harmful factors
If multiple materials are combined, then NVH reduction effectiveness improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges foam material and non-foamed elastomeric material into a unified damper structure that functions as a single integrated component. This combining approach achieves superior NVH reduction effectiveness while maintaining ease of manufacture through a unified manufacturing process that produces both material types in one operational step.
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 composite damper effectively dampens specific NVH-causing frequencies, providing a quieter and smoother ride by converting vibrational energy into heat, thus reducing mechanical stress and improving vehicle performance.
Implementation Method 1
elastomeric foam...converting vibrational energy into heat
Implementation Method 2
converting vibrational energy into heat
Implementation Method 3
heat-resistant silicone rubber retaining members
Implementation Method 4
dampen vibrations and attenuate sound
Data Source
AI summary
A composite drive shaft damper includes both foamed and non-foamed NVH-reducing materials to dampen particular NVH-causing frequencies within a drive shaft.