Magnetorheological Elastomer Mount for Multi-Directional Force Control
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Solution Overview
Problem
Existing vehicle subframe mounts do not effectively vary elastic force in multiple directions in response to input forces, limiting their adaptability and performance, especially during turning and torque differences between wheels.
Innovation Solution
A subframe mount design incorporating an inner and outer magnetic cylinder with magnetorheological elastomers, where magnetic particles are arranged differently to change the magnetic field strength, allowing for adjustable elastic force in various directions through a coil-generated magnetic field, including a combination of cylindrical and flange-shaped magnetorheological elastomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional mount with uniform elastic properties is used, then the structure is simple and easy to manufacture, but the elastic force cannot be dynamically adjusted in multiple directions to respond to different input forces
Solution Approach 1:
The mount is segmented into multiple magnetorheological elastomer units (first, second, third, and fourth MRE units) with different magnetic particle arrangements. Each unit is positioned to respond to forces in specific directions, enabling multi-directional elastic force adjustment while maintaining a manageable structural complexity through modular organization.
Solution Approach 2:
Different regions of the mount have magnetorheological elastomers with locally optimized magnetic particle arrangements. The first and second MRE units have particles arranged to respond to forces in one direction, while the third and fourth units have particles arranged to respond to forces in another direction, creating local quality variations that enable directional adaptability.
2Adaptability or versatility
If magnetorheological elastomer with magnetic particles arranged in one direction is used, then the elastic force in that direction can be adjusted, but the elastic force in other directions cannot be effectively controlled
Solution Approach 1:
The magnetorheological elastomer units exhibit asymmetric magnetic particle arrangements relative to each other. The first and second MRE units have magnetic particles arranged in a first direction, while the third and fourth units have magnetic particles arranged in a second direction that is different from the first direction. This asymmetric configuration enables independent control of elastic forces in multiple directions without requiring complex additional mechanisms.
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
Enables dynamic adjustment of elastic force in multiple directions, improving vehicle handling and reducing noise and vibration by altering the modulus of elasticity based on yaw rate and vehicle speed, enhancing both axial and perpendicular resilience.
Implementation Method 1
a magnetorheological elastomer disposed between the inner cylinder and the outer cylinder; and a coil configured to apply a magnetic field to the magnetorheological elastomer to change viscoelasticity of the magnetorheological elastomer
Implementation Method 2
the magnetorheological elastomer includes a plurality of the magnetorheological elastomers including magnetic particles arranged in different manners
Data Source
AI summary
When forces are input to a mount in a plurality of directions, an ECU changes the magnitude of a coil excitation current to change the strength of a magnetic field. At this moment, the elastic force of the mount can be changed in directions in response to the plurality of directions in which the forces are input using a plurality of magnetorheological elastomers (a brim-shaped MRE portion and a cylindrical MRE portion) in which magnetic particles are arranged in different manners.