Hydraulic Damping Wedge With Frequency Decoupling
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Solution Overview
Problem
Current hydraulic damping wedges face challenges in effectively managing stiffness characteristics across various frequency ranges, particularly in low and high frequency zones, which affects vehicle comfort and suspension performance.
Innovation Solution
The hydraulic damping wedge incorporates low-frequency and high-frequency decoupling devices, each comprising a membrane that evolves between grids or perforated surfaces, allowing for adjustable stiffness. Low-frequency decoupling devices act between 0 Hz and 5 Hz, while high-frequency devices act between 100 Hz and 500 Hz, ensuring high stiffness at low frequencies and low dynamic stiffness at higher frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single working chamber with single compensation chamber is used, then the device complexity is reduced, but the ability to manage stiffness characteristics across different frequency ranges is insufficient
Solution Approach 1:
The hydraulic damping wedge is segmented into multiple working chambers (first and second working chambers) each with its own compensation chamber, allowing independent control of stiffness characteristics for different frequency ranges. This segmentation enables the system to provide high stiffness in quasi-static situations while maintaining high damping in specific frequency zones.
Solution Approach 2:
Each working chamber is equipped with its own compensation chamber, creating local quality differences that allow specific frequency ranges to be targeted. The first working chamber with first compensation chamber handles one frequency range while the second working chamber with second compensation chamber handles another frequency range, providing localized stiffness control.
2Adaptability or versatility
If multiple working chambers with separate compensation chambers are used, then the stiffness characteristics across frequency ranges are improved, but the device complexity increases
Solution Approach 1:
Multiple working chambers and compensation chambers are merged into a single integrated hydraulic damping wedge structure, sharing common structural elements and fluid pathways where possible. This combining approach provides the benefits of multiple frequency zones while controlling overall device complexity through shared architecture.
3Strength
If decoupling device is added for low frequency, then the stiffness at very low frequencies is improved, but the device complexity increases
Solution Approach 1:
A decoupling device is introduced as an intermediary element between the first working chamber and the first compensation chamber. This decoupling device selectively decouples the hydraulic connection at low frequencies, allowing the first working chamber to provide high stiffness in quasi-static situations while permitting fluid communication at higher frequencies for damping purposes.
4Strength
If high stiffness is maintained in static situation, then the suspension performance is improved, but the vibration damping at low frequencies may be reduced
Solution Approach 1:
The decoupling device provides dynamic behavior by selectively coupling and decoupling hydraulic pathways based on frequency. At static and very low frequencies, the decoupling device maintains high stiffness by blocking fluid communication, while at higher frequencies it allows fluid flow to enable vibration damping, thus adapting its behavior to the operating conditions.
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 the wedge to maintain high stiffness in static situations and provide effective damping across disjoint frequency zones, enhancing vehicle comfort by adapting to different amplitude and frequency ranges.
Implementation Method 1
the low-frequency decoupling device comprises a membrane able to evolve in a thickness limited by two grids or perforated surfaces
Implementation Method 2
the high-frequency decoupling device comprises a membrane able to evolve in a thickness limited by two grids or perforated surfaces
Implementation Method 3
hydraulic damping wedge comprising: two columns of fluid, each column of fluid having one end placed in communication with a main hydraulic inflation chamber
Data Source
Figure 1~2
AI summary
The invention relates to a hydraulic damping shim (10) which includes: two fluid columns (13), each fluid column (13) having one end placed in communication with a main hydraulic inflation chamber (15), referred to as working chamber, said main hydraulic inflation chamber (15) being common to all the fluid columns (13), the other end of each fluid column (13) being placed in communication with a specific hydraulic inflation chamber (16), referred to as compensation chamber, specific to each fluid column (13); one of the specific hydraulic inflation chambers (16) having an inflation stiffness (Km1) no lower than an inflation stiffness (Kg) of the main hydraulic inflation chamber (15), characterised in that said hydraulic damping shim (10) also includes: a low-frequency decoupling device (23) placed in series with one of the fluid columns.