Weighted Membrane Vibration Absorber for High-Temperature Damping
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Solution Overview
Problem
Existing vibration absorbing devices face limitations such as material degradation at high temperatures and the need for multiple attachment points, particularly in automotive and aeronautical applications, while current solutions like NES and NVD have drawbacks like material limitations and fluid leakage.
Innovation Solution
A vibration absorbing device with a membrane and weight system that uses fluid displacement to dissipate energy, combining principles of NES and NVD, allowing single-point attachment and operation across a wide temperature range, using materials like aluminum and Inconel for the membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomers are used in NES devices for damping, then good damping properties are achieved, but the device cannot withstand high temperatures above 200°C
Solution Approach 1:
The patent replaces elastomeric materials with a mechanical system consisting of a membrane and weights that operate through geometric non-linearity. The membrane's large deflection behavior provides the non-linear stiffness needed for NES operation, eliminating temperature-sensitive elastomers while maintaining damping functionality through pure mechanical means.
Solution Approach 2:
The invention changes the fundamental operating parameters by using a membrane with large deflection capability instead of elastomeric materials. The membrane's ability to undergo significant geometric changes provides temperature-independent non-linear behavior, allowing the device to function reliably at temperatures exceeding 200°C while maintaining effective vibration damping.
2Reliability
If NVD devices use viscous fluid for damping, then good fatigue behavior is achieved, but fluid leakage and explosion risks occur at high temperatures
Solution Approach 1:
The patent eliminates the fluid-based damping mechanism entirely, replacing it with a dry mechanical system using a membrane and weights. This substitution removes all fluid-related hazards including leakage and explosion risks while maintaining effective vibration energy dissipation through the membrane's geometric non-linearity and the weights' inertial effects.
3Reliability
If NVD devices are designed with two attachment points for piston movement, then proper vibration damping is achieved, but the device cannot be installed with single-point attachment on components
Solution Approach 1:
The patent creates a universal vibration damping device that can be attached with a single point to any component regardless of its vibration mode. The membrane-weight system inherently adapts to the component's vibration characteristics, providing effective damping for both single-point and multi-point attachment scenarios, thus eliminating the need for complex two-point attachment mechanisms.
4Reliability
If conventional vibration absorbing devices are used in vehicles, then vibration protection is provided, but material degradation occurs at high operating temperatures
Solution Approach 1:
The patent employs a composite structure combining a specialized membrane material with weight elements. The membrane is designed with high temperature resistance and large deflection capability, while the weights provide inertial damping. This composite approach maintains effective vibration protection at temperatures where conventional elastomeric materials would degrade or fail.
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
Effectively dissipates vibration energy at high temperatures without material degradation, maintaining resonance frequency control and energy transfer, while minimizing mass impact and installation complexity.
Implementation Method 1
at least one duct configured to permit the fluid to flow between the two chambers if the membrane and the weight move
Implementation Method 2
The fundamental principle of the NES is to trigger an instability on the secondary resonator, said instability tending towards a relaxation limit cycle which will permit the dissipation of energy
Implementation Method 3
The fundamental principle of the NVD is to connect two points which vibrate in opposite phase by a piston, the movement of which will be braked by a fluid
Data Source
AI summary
Vibration absorbing device comprising a housing (12), a membrane (14) enclosed in the housing (12) and thus forming two chambers (18a, 18b) in the housing (12), said chambers (18a, 18b) being filled with a fluid, at least one weight (16), arranged on the membrane (14) in order that a movement of the weight (16) causes a movement of the membrane (14), and at least one duct (24) arranged to permit the fluid to flow between the two chambers (18a, 18b) if the membrane (14) and the weight (16) move.