Suspension Mount Double Damping for High-Frequency Cabin Vibration
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Solution Overview
Problem
Existing suspension systems in sports-type road vehicles fail to effectively reduce vibrations transmitted to the cabin at high impulse frequencies, particularly in light sports cars with active suspensions, leading to reduced driving comfort.
Innovation Solution
Implementing a double damping stage connection between the suspension assemblies and the vehicle body, comprising an intermediate body and two elastic elements, calibrated to attenuate vibrations at specific frequencies, including a first elastic element between the suspension assembly and the intermediate body, and a second elastic element between the intermediate body and the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single elastic bushing is used at the suspension-vehicle body connection, then the structure is simple and easy to manufacture, but it fails to effectively reduce vibrations at high impulse frequencies (above 800Hz)
Solution Approach 1:
The single elastic bushing is segmented into two separate elastic bushings arranged in series between the suspension assembly and the vehicle body. This segmentation creates two distinct damping stages, each capable of filtering specific frequency ranges, thereby effectively reducing high-frequency vibrations (above 800Hz) that pass through a single bushing, while maintaining manufacturing feasibility through standardized component assembly.
Solution Approach 2:
An intermediate body is introduced as a mediator between the suspension assembly and the vehicle body. This intermediate structure houses the two elastic bushings in series and provides a mounting interface for both the suspension and the vehicle body. The intermediary enables the implementation of the double-damping-stage configuration without requiring direct modification of the suspension assembly or vehicle body structures.
2Speed
If active suspensions are applied in light sports cars, then driving dynamics are improved, but high-frequency wheel-side impulses (above 800Hz) are generated that are not adequately reduced
Solution Approach 1:
The solution utilizes the principle of mechanical vibration damping by introducing two elastic bushings with specific stiffness and damping characteristics. The first bushing (closer to the suspension) and the second bushing (closer to the vehicle body) are designed with different damping properties to create a frequency-dependent filtering effect. This mechanical vibration approach passively attenuates high-frequency impulses generated by active suspensions without interfering with the dynamic performance benefits.
3Object-affected harmful factors
If the elastic characteristics of the bushing are adjusted to reduce vibrations, then vibration transmission is reduced, but the ability to handle high-frequency impulses (above 800Hz) remains insufficient
Solution Approach 1:
The two elastic bushings are designed with different local qualities (distinct elastic characteristics and damping properties) to address different frequency ranges. The first bushing is optimized for lower frequency vibrations while the second bushing is optimized for high-frequency impulses. This local differentiation of elastic characteristics enables broad frequency range coverage, effectively reducing vibrations across the entire spectrum from low to high frequencies (including above 800Hz) that a single uniformly characterized bushing cannot handle.
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 double damping stage significantly reduces vibrations, achieving over double the effectiveness in reducing cabin vibrations, especially at frequencies above 600Hz, thereby enhancing driving comfort.
Implementation Method 1
a first elastic element interposed between the second end of the suspension assembly and the corresponding intermediate body; and at least a second elastic element interposed between the intermediate body and the vehicle body
Implementation Method 2
configured to support the vehicle body in a suspended configuration and to dampen vibrations transmitted to the cabin
Data Source
Figure 1
Figure 2
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AI summary
A road vehicle comprising two front wheels, two rear wheels, a vehicle body provided with a driver's cabin, and four suspension assemblies configured to support the vehicle body in a suspended configuration and to dampen vibrations transmitted to the cabin; wherein each suspension assembly comprises a first end coupled to a corresponding wheel and a second end coupled to the vehicle body; characterized in that the connection between at least one suspension assembly and the vehicle body comprises: - an intermediate body interposed between the second end of the suspension assembly and the vehicle body; - a first elastic element connecting the second end of the suspension assembly to the intermediate body; and - at least a second elastic element connecting the intermediate body and the vehicle body.