Compression-Type Mass Damper for Suspension Resonance Control
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Solution Overview
Problem
Current mass dampers are ineffective in reducing resonant vibrations from the road and engine/drive system, which exacerbate NVH issues in vehicles, making it difficult to meet European noise regulations such as EU#1 (92 dB), EU#9 (81 dB), and EU#6 (78 dB).
Innovation Solution
A compression-type mass damper is integrated into the suspension system, featuring a damping mass with an open space, a weight body, and a compression plate, which absorbs vibrations and applies a fixing force to the open space, avoiding resonant frequency influences without reducing the stiffness of the suspension system. The damper is made of elastic material with a reversed trapezoidal cross-section and includes protrusions for enhanced contact, and is fixed using a damper stud.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a mass damper is mounted on the drive system, vehicle body connection part, or exhaust system, then the magnitude of vibration can be reduced, but the resonant frequency influence from the road and engine/drive system cannot be avoided
Solution Approach 1:
The mass damper is mounted on the suspension system which acts as an intermediary between the road/engine vibration sources and the vehicle body. This intermediary mounting position allows the mass damper to counteract resonant vibrations before they are transmitted to the vehicle body, effectively addressing both vibration reduction and resonance avoidance simultaneously
2Object-affected harmful factors
If a bushing is used to adjust the stiffness of the junction between the vehicle body and suspension component, then vibration can be reduced, but the resonant frequency influence remains effective
Solution Approach 1:
Instead of merely adjusting stiffness parameters through bushings, the invention introduces a mass damper with specific mass and damping parameters mounted on the suspension system. This changes the dynamic parameters of the system to actively counteract resonant frequencies while maintaining vibration reduction benefits
3Object-affected harmful factors
If the stiffness of the suspension system is reduced to avoid resonant frequency, then vibration absorption improves, but the suspension system becomes less rigid
Solution Approach 1:
The suspension system is segmented into two functional components: the original suspension structure that maintains stiffness and load-bearing capability, and the added mass damper that provides vibration absorption and resonance counteraction. This segmentation allows each component to optimize its specific function without compromising the other
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 NVH by enhancing vibration absorption performance, maintaining spring stiffness, and meeting European noise regulations by minimizing the impact of resonant frequencies, resulting in improved ride and handling performance and a marked reduction in noise levels.
Implementation Method 1
a damping mass formed with an open space, the damping mass enclosing an outer surface of a target through the open space and absorbing vibration of the target
Implementation Method 2
The damping mass may be made of elastic material
Implementation Method 3
a weight body enclosed by the damping mass, the weight body applying weight to the damping mass
Implementation Method 4
a compression plate enclosed by the damping mass, the compression plate applying a fixing force to the open space
Data Source
AI summary
A compression-type mass damper may include a damping mass formed with an open space, the damping mass enclosing an outer surface of a target through the open space and absorbing vibration of the target, a weight body enclosed by the damping mass, the weight body applying weight to the damping mass, anda compression plate enclosed by the damping mass, the compression plate applying a fixing force to the open space.