Magnetorheological Fluid Damping Control Device with Perpendicular Magnetic Field
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Solution Overview
Problem
Existing damping control devices using magnetorheological fluid (MR fluid) in engine mounts suffer from reduced control efficiency due to 'control invalidity sections' where the magnetic field is parallel to the fluid flow, leading to increased current requirements and heat generation.
Innovation Solution
A damping control device configuration where the magnetic field is perpendicular to the MR fluid flow throughout the entire path, using a lower core with an outer ring, upper plate, and orifice with nonmagnetic material, and a coil to align particles perpendicularly, allowing efficient control of MR fluid flow and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic field is applied in the conventional configuration, then the MR fluid can be controlled to some extent, but control efficiency is reduced due to control invalidity sections where the magnetic field is parallel to the fluid flow
Solution Approach 1:
The patent inverts the conventional magnetic field configuration by positioning the coil at the end face of the core rather than wrapping it around the side. This inversion ensures that the magnetic field lines are always perpendicular to the MR fluid flow direction throughout the entire flow path, eliminating control invalidity sections and improving control efficiency.
2Reliability
If higher current is applied to overcome control invalidity sections, then MR fluid control is maintained, but heat generation increases
Solution Approach 1:
By inverting the coil position to the end face of the core, the magnetic field is optimally aligned perpendicular to the fluid flow throughout the entire path. This eliminates the need for excessive current to compensate for control invalidity sections, thereby reducing heat generation while maintaining effective MR fluid control.
3Reliability
If the magnetic field is perpendicular to the MR fluid flow throughout the entire path, then control efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The patent positions the coil at the end face of the core, which is a structurally simple and straightforward configuration. This inverted positioning naturally ensures perpendicular magnetic field alignment with the fluid flow throughout the entire path, achieving improved control efficiency without introducing significant structural complexity.
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 vibration damping across different frequency bands with reduced current usage and minimized heat generation, enhancing the control efficiency of MR fluid flow in engine mounts.
Implementation Method 1
a coil provided between the upper plate and the lower plate
Implementation Method 2
the particles in the MR fluid are aligned perpendicular to the formation direction of the magnetic field. The flow characteristic of the MR fluid is changed depending on the movement of the particles
Implementation Method 3
a membrane made of an elastic material and combined with the lower core
Implementation Method 4
plate springs connecting the outer ring and the pressure applying plate
Data Source
AI summary
A damping control device includes a lower core, a nonmagnetic orifice, an upper core, and a membrane made of an elastic material to shield a lower end of the lower core, and in which the lower core and the upper core are magnetized when a current is applied to the coil, and a predetermined amount of the MR fluid is filled therein, such that the MR fluid flows between the pressure applying plate and the upper plate according to an elastic compression of the membrane.