Magneto-elastic Damper Mount for Adjustable Stiffness
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Solution Overview
Problem
Existing damper mounts face a trade-off between reducing vibration and noise transmission to the vehicle cabin and maintaining handling and flat ride performance, as high stiffness improves handling but fails to reduce vibration, while low stiffness reduces noise and vibration but impairs handling.
Innovation Solution
A damper mount utilizing a magneto-elastic member with a coil to apply magnetic flux, controlling stiffness through shear deformation, allowing for adjustable stiffness based on operating conditions to balance handling and vibration/noise performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the stiffness of the damper mount is low, then vibration and noise transmission to the vehicle body is reduced, but the handling and flat ride performance of the vehicle is impaired
Solution Approach 1:
The damper mount employs a magneto-elastic member whose stiffness can be dynamically adjusted by applying magnetic flux through a coil. This allows the stiffness to be changed from a low state (reducing vibration and noise transmission to the vehicle body) to a high state (ensuring handling and flat ride performance), resolving the contradiction between these opposing requirements through active control based on operating conditions
2Reliability
If the stiffness of the damper mount is high, then handling and flat ride performance are ensured, but vibration and noise transmission to the vehicle body is not adequately reduced
Solution Approach 1:
The magneto-elastic member enables dynamic adjustment of stiffness in the opposite direction: when high stiffness is required for handling and flat ride performance, magnetic flux is applied to increase stiffness; when vibration and noise reduction is prioritized, the magnetic flux is reduced or removed to decrease stiffness, thus resolving the contradiction between performance and comfort
3Adaptability or versatility
If a magneto-elastic member is used to vary stiffness, then both handling performance and vibration reduction can be achieved, but the device complexity increases due to the coil and magnetic flux control system
Solution Approach 1:
The invention changes the physical state of the magneto-elastic member by applying magnetic flux, which alters its elastic modulus and stiffness characteristics. This parameter change approach allows a single component to provide multiple stiffness states without requiring physically different mount designs, thereby achieving adaptability while limiting complexity growth to just the magnetic actuation system
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 adjusts stiffness to enhance both vehicle handling and vibration/noise reduction, ensuring improved performance across various conditions by leveraging the elastic properties of magneto-elastic materials in shear deformation.
Implementation Method 1
a coil (25) configured to apply a magnetic flux to the first magneto-elastic member
Implementation Method 2
In a magneto-elastic member, magnetic particles are typically dispersed in polymer material, and when subjected to a magnetic flux, the magnetic particles are aligned in the direction of the magnetic flux so that an internal stress is created in the magneto-elastic member. As a result, the stiffness of the magneto-elastic member against shear deformation changes.
Data Source
AI summary
Provided is a damper mount (1, 101, 201) configured to be interposed between a damper (11) of a wheel suspension device and a vehicle body (9). The damper mount includes: an annular outer member (22) fixed to the vehicle body; an annular inner member (21) fixed to the damper, one of the outer member and the inner member being received in another of the outer member and the inner member; a first magneto-elastic member (24) radially interposed between the inner member and the outer member; and a coil (25) configured to apply a magnetic flux to the first magneto-elastic member.