Magneto-rheological Elastomer Mount for Active Noise Vibration Control
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Solution Overview
Problem
Active noise vibration control apparatuses using magneto-rheological elastomers face a challenge in maintaining good static load support performance while achieving a large elastic changing rate, as the low hardness of the substrate elastomer compromises static load support.
Innovation Solution
The apparatus comprises a housing with an outer core and an inner core, filled with magneto-rheological elastomer containing magnetic particles, where the magnetic path-forming portion has a higher content of magnetic particles for increased rigidity and the non-path-forming portion maintains low hardness for mobility, supported by an electromagnetic coil that adjusts the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hardness of the substrate elastomer is reduced to increase the elastic changing rate, then the mobility of magnetic particles is improved, but the static load support performance deteriorates
Solution Approach 1:
The magneto-rheological elastomer is divided into two regions with different magnetic particle content: a magnetic path-forming portion with higher magnetic particle content for increased rigidity and static load support, and a non-path-forming portion with lower magnetic particle content for maintaining low hardness and high elastic changing rate. This local differentiation resolves the contradiction by assigning different material properties to different functional zones.
2Reliability
If the magnetic particle content is increased to improve noise/vibration-proof effect, then the rigidity in magnetic path is improved, but the mobility of magnetic particles deteriorates
Solution Approach 1:
Different magnetic particle content rates are applied to different portions of the magneto-rheological elastomer: the magnetic path-forming portion has higher content for noise/vibration damping, while the non-path-forming portion has lower content for particle mobility and elastic response.
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
This configuration enables effective noise and vibration damping with improved static load support and a large elastic changing rate, enhancing the noise/vibration-proof effect while maintaining mobility.
Implementation Method 1
a magnetic response-type elastic device using a magneto-rheological elastomer (MRE) in which an apparent elastic modulus of the magneto-rheological elastomer changes depending on the strength of a magnetic field applied
Implementation Method 2
an electromagnetic coil that is positioned between the outer core and the inner core
Data Source
AI summary
An engine mount control apparatus that is an active noise vibration control apparatus according to the present disclosure is characterized by being provided with a housing that has an outer core, an inner core that is disposed inside the outer core, and an electromagnetic coil that is positioned between the outer core and the inner core and by a portion between the outer core and the inner core being filled with a magneto-rheological elastomer containing magnetic particles. The present disclosure enables the maintenance of good static load support performance.