Active Vibration Damping with Segmented MR Fluid Chambers
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Solution Overview
Problem
Conventional active vibration control devices using magneto-rheological fluid face issues of increased manufacturing costs and vehicle weight due to larger fluid chamber capacities, and performance degradation from magnetic powder precipitation.
Innovation Solution
An active vibration control device with an outer and inner cylinder, flexible member, and magnetic bodies forming a magnetic circuit, where fluid chambers are partitioned to improve responsiveness without increasing magneto-rheological fluid capacity, and minimize magnetic powder precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the capacity of the fluid chamber is increased to improve responsiveness to vibration, then the responsiveness is improved, but the manufacturing cost and vehicle weight increase due to more magneto-rheological fluid
Solution Approach 1:
The fluid chamber is divided into a first fluid chamber and a second fluid chamber that are connected through flow passages. The first fluid chamber contains magneto-rheological fluid for active vibration control, while the second fluid chamber contains ordinary fluid to provide damping. This segmentation allows the system to achieve improved responsiveness through the first chamber's magnetic control mechanism without requiring a large total fluid volume, thus avoiding the weight and cost penalties of simply increasing the overall chamber capacity.
2Speed
If the capacity of the fluid chamber is increased to improve responsiveness to vibration, then the responsiveness is improved, but the manufacturing cost increases due to more magneto-rheological fluid
Solution Approach 1:
The fluid chamber is divided into a first fluid chamber and a second fluid chamber that are connected through flow passages. The first fluid chamber contains magneto-rheological fluid for active vibration control, while the second fluid chamber contains ordinary fluid to provide damping. This segmentation allows the system to achieve improved responsiveness through the first chamber's magnetic control mechanism without requiring a large total fluid volume, thus avoiding the weight and cost penalties of simply increasing the overall chamber capacity.
3Speed
If the usage amount of magneto-rheological fluid is increased to improve responsiveness, then the responsiveness is improved, but the performance decreases due to precipitation of magnetic powder
Solution Approach 1:
The fluid chamber is divided into a first fluid chamber and a second fluid chamber that are connected through flow passages. The first fluid chamber contains magneto-rheological fluid for active vibration control, while the second fluid chamber contains ordinary fluid to provide damping. This segmentation allows the system to achieve improved responsiveness through the first chamber's magnetic control mechanism without requiring a large total fluid volume, thus avoiding the weight and cost penalties of simply increasing the overall chamber capacity.
Solution Approach 2:
The second fluid chamber filled with ordinary fluid acts as an intermediary that provides passive damping while allowing the first fluid chamber to maintain a controlled, optimized volume of magneto-rheological fluid. This intermediary chamber helps maintain system performance by providing additional damping function without requiring increased amounts of magneto-rheological fluid, thereby preventing magnetic powder precipitation issues.
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
Enhances responsiveness to external forces while maintaining performance by controlling fluid flow and magnetic field interactions, reducing the need for larger fluid chambers and minimizing magnetic powder issues.
Implementation Method 1
the magneto-rheological fluid flows from one fluid chamber to the other fluid chamber through the flow passages depending on the magnitude of inputted vibration amplitude. In this case, the active vibration control device controls the flow of the magneto-rheological fluid by varying the density of a magnetic flux generated by the exciting coil
Implementation Method 2
an exciting coil that forms a magnetic circuit in a direction intersecting the flow passages
Implementation Method 3
varying the density of a magnetic flux generated by the exciting coil
Data Source
AI summary
An active vibration control device includes: an outer cylinder; an inner cylinder arranged on an inner peripheral side of the outer cylinder; an electromagnetic coil; a first magnetic body and a second magnetic body; a first fluid chamber filled with a magneto-rheological fluid; a second fluid chamber adjacent to the first fluid chamber and filled with a fluid; an outer cylinder flange; and an inner cylinder flange arranged to be separated from the outer cylinder flange in an axial direction, the first fluid chamber and the second fluid chamber are partitioned from each other in the axial direction by a flexible member, the second fluid chamber is formed to be sandwiched between the inner cylinder flange and the outer cylinder flange, and portions of the first fluid chamber form flow passages of the magneto-rheological fluid that are located on a magnetic circuit.