Integrated Frequency-Dependent Damper Valve for Compact Adaptive Damping
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Solution Overview
Problem
Conventional damper assemblies face challenges with frequency-dependent valves that are expensive, complex, and require additional modifications, leading to increased dead-length and potential weakening of the damper, while also being limited in tuning capabilities and requiring costly drilling processes.
Innovation Solution
A damper assembly with a frequency-dependent valve that includes a tubular FD housing, an FD slider dividing the FD chamber into pressure and displacement chambers, an FD control stack regulating fluid flow, and an FD working disc deflecting to manage fluid flow between compression and rebound chambers, integrated within the piston to provide adaptive damping characteristics without the need for additional modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency-dependent valve assemblies are added as add-ons to existing damper designs, then the damper can provide adaptive damping characteristics, but the dead-length of the damper significantly increases
Solution Approach 1:
The frequency-dependent valve assembly is merged with the piston body by integrating the FD housing onto the piston rod and positioning the FD slider within the piston structure. This combination allows the frequency-dependent valve to become an inherent part of the damper assembly rather than an external add-on, thereby achieving adaptive damping characteristics without significantly increasing the dead-length of the damper.
Solution Approach 2:
The FD slider is disposed within the FD housing, creating a nested structure where the frequency-dependent valve components are contained within the existing piston volume. This nesting approach allows the frequency-dependent valve assembly to occupy space within the existing damper structure rather than extending the overall length, thus maintaining compact dimensions while providing adaptive damping.
2Ease of manufacture
If additional intersecting bypass holes are drilled in existing dampers to accommodate frequency-dependent valves, then the valve can be installed, but the process is expensive, generates contaminants, and weakens portions of the damper
Solution Approach 1:
The frequency-dependent valve assembly is designed as a separate, modular unit with the FD housing, FD slider, and associated components configured as distinct elements that can be assembled without modifying the existing damper structure. This segmentation allows the valve to be installed as a complete assembly, eliminating the need to drill intersecting bypass holes in the existing damper body, thereby avoiding contamination, cost escalation, and structural weakening.
Solution Approach 2:
The bypass passages and fluid communication pathways are pre-configured within the FD housing and piston body design itself, rather than requiring post-manufacturing modifications. The FD housing includes integrated bypass passages that provide fluid communication between chambers, eliminating the need for additional drilling operations and allowing the valve assembly to be installed in a straightforward manner without compromising damper integrity.
3Device complexity
If conventional passive shock absorber valves are used, then the damper structure remains simple, but the compromise between performance, safety and driving comfort is poor
Solution Approach 1:
The frequency-dependent valve introduces dynamic adaptability to the damper system through the FD slider that can move between different positions based on operating conditions. The valve provides different damping characteristics depending on the frequency of input motion, with the FD slider automatically adjusting fluid flow paths to provide appropriate damping forces for body motions at low frequencies and wheel vibrations at high frequencies, thereby achieving adaptive performance without requiring complex active control systems.
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
The solution enables improved damping performance by adapting to different frequency excitations, enhancing comfort and road holding without increasing complexity or cost, while maintaining the integrity of the damper assembly.
Implementation Method 1
an FD working disc configured to deflect together with the FD housing for regulating fluid flow between the rebound chamber and the compression chamber
Implementation Method 2
an FD control stack configured to regulate fluid flow between the intermediate chamber and the FD pressure chamber
Implementation Method 3
Such solutions allow to achieve high damping forces for low frequencies, related to body motions and low damping forces for high frequencies, related to vibrations of the wheels
Data Source
AI summary
A damper assembly includes a damper tube extending along a center axis and defining a fluid compartment. A piston is attached to a damper rod and divides the fluid compartment into a compression chamber and a rebound chamber. The piston includes a piston body and a frequency-dependent (FD) valve. The piston body defines an intermediate chamber in fluid communication with the rebound chamber. The FD valve includes: an FD housing having a tubular shape surrounding an FD chamber, an FD slider disposed within the FD housing and dividing the FD chamber into an FD pressure chamber and an FD displacement chamber, an FD control stack configured to regulate fluid flow between the intermediate chamber and the FD pressure chamber, and an FD working disc configured to deflect together with the FD housing for regulating fluid flow between the rebound chamber and the compression chamber.