Active Vibration Damping Structure With Dual Liquid Chambers
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Solution Overview
Problem
Conventional active vibration damping devices increase manufacturing costs and vehicle weight by requiring larger volumes of magneto-viscoelastic fluid, which also leads to performance deterioration due to increased magnetic powder precipitation.
Innovation Solution
The device comprises an outer cylinder, inner cylinder, magnetic field generator, magnetic body, and two liquid chambers filled with different fluids, where the second chamber's volume is increased to improve response without increasing the first chamber's volume, and a method of manufacturing involves integrating elastic bodies and flexible members to manage magnetic powder precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the volume of the liquid chamber filled with magneto-viscoelastic fluid is increased to improve response performance, then the response performance to input vibration amplitude is improved, but the manufacturing cost and vehicle weight increase due to more expensive and heavier magneto-viscoelastic fluid
Solution Approach 1:
The liquid chamber is divided into two separate chambers: a first liquid chamber filled with magneto-viscoelastic fluid and a second liquid chamber filled with ordinary liquid. This segmentation allows the system to utilize the properties of both fluid types while minimizing the amount of expensive magneto-viscoelastic fluid required, thereby improving response performance without proportionally increasing weight and cost.
Solution Approach 2:
An excitation coil is introduced as an intermediary component that generates a magnetic field to control the magneto-viscoelastic fluid's viscosity. This allows precise control over the damping characteristics without requiring large volumes of the fluid, enabling improved response performance through controlled viscosity changes rather than through volume increase.
2Speed
If the volume of the liquid chamber filled with magneto-viscoelastic fluid is increased to improve response performance, then the response performance to input vibration amplitude is improved, but the manufacturing cost increases due to more expensive magneto-viscoelastic fluid
Solution Approach 1:
The liquid chamber is divided into two separate chambers: a first liquid chamber filled with magneto-viscoelastic fluid and a second liquid chamber filled with ordinary liquid. This segmentation allows the system to utilize the properties of both fluid types while minimizing the amount of expensive magneto-viscoelastic fluid required, thereby improving response performance without proportionally increasing weight and cost.
Solution Approach 2:
The patent replaces part of the expensive magneto-viscoelastic fluid with cheaper ordinary liquid in the second liquid chamber. This substitution reduces the overall cost of the device while maintaining functional performance, as the ordinary liquid serves the damping function without requiring the expensive magnetic properties.
3Speed
If the amount of magnetic viscoelastic fluid increases, then the response performance is improved, but the absolute precipitated amount of magnetic powder increases which affects device performance
Solution Approach 1:
The liquid chamber is divided into two separate chambers: a first liquid chamber filled with magneto-viscoelastic fluid and a second liquid chamber filled with ordinary liquid. This segmentation allows the system to utilize the properties of both fluid types while minimizing the amount of expensive magneto-viscoelastic fluid required, thereby improving response performance without proportionally increasing weight and cost.
Solution Approach 2:
The patent changes the physical parameters of the system by introducing a second liquid chamber with ordinary liquid and using an excitation coil to control the magnetic field. This allows the system to achieve the desired damping response through controlled magnetic field effects on a smaller volume of magneto-viscoelastic fluid, reducing the total magnetic powder content and its 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
This configuration enhances response to vibrations and loads without increasing the first chamber's volume, reduces magnetic powder precipitation, and maintains performance by redistributing the powder, thus improving durability and reducing costs.
Implementation Method 1
two liquid chambers filled with a magneto-viscoelastic fluid and connected to each other by a flow path and an excitation coil that forms a magnetic path
Implementation Method 2
the active vibration damping device controls the flow of the magneto-viscoelastic fluid by varying the magnetic flux density generated by the excitation coil
Implementation Method 3
the magneto-rheological fluid attempts to flow through the flow passage from one of the liquid chambers toward the other liquid chamber in accordance with the magnitude of the amplitude of the input vibration
Data Source
AI summary
Provided is an active vibration damping device including: an outer cylinder; an inner cylinder disposed on an inner peripheral side of the outer cylinder; a magnetic field generator that generates a magnetic field; a magnetic body that forms a magnetic path by the magnetic field; a first liquid chamber filled with a magneto-viscoelastic fluid; a second liquid chamber adjacent to the first liquid chamber and filled with liquid, wherein the magnetic field generator, the magnetic body, the first liquid chamber, and the second liquid chamber are provided between the inner cylinder and the outer cylinder in the radial direction, the first liquid chamber and the second liquid chamber are partitioned by a flexible member, the flexible member extends in an axial direction of the inner cylinder, and a part of the first liquid chamber forms a flow path for the magnetic viscoelastic fluid positioned on the magnetic path.