Compensating Damper Plate Stack for Short-Duration Overload Damping
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Solution Overview
Problem
Existing energy absorbing devices struggle to efficiently dissipate high frequency, high force, and low amplitude oscillations of short duration, and have a limited range of applicability.
Innovation Solution
A compensating damper with a hermetically sealed chamber containing a stack of plates with a film of viscous fluid between each pair of plates, featuring different film thickness zones to provide varying resistance responses to external forces, and a design that allows axial movement of the plates to squeeze out fluid and convert energy into heat through molecular friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single film thickness is used across all plates, then the device structure is simple, but it cannot efficiently dissipate high frequency, high force oscillations of short duration
Solution Approach 1:
The patent applies local quality by creating different film thickness zones at specific locations within the plate assembly. The first and second film thickness zones are positioned at opposite sides of the plate stack, with each zone having a distinct thickness. This allows different regions of the damper to provide different resistance characteristics, enabling efficient dissipation of high frequency, high force oscillations while maintaining overall structural simplicity.
2Reliability
If the damper provides high resistance to short duration overloads, then it protects equipment from shocks, but it may interfere with normal operational movements
Solution Approach 1:
The patent implements dynamics by designing a system where the resistance force is not constant but varies with the applied load. The multiple film thickness zones create a non-linear damping characteristic where the resistance adapts to the magnitude and frequency of external forces. During normal operation with low forces, the damper provides minimal resistance, but when subjected to high frequency, high force oscillations, the resistance increases automatically to provide protection.
3Adaptability or versatility
If conventional energy absorbing devices are used, then they provide basic damping, but they have a limited range of applicability and cannot handle varying input conditions
Solution Approach 1:
The patent applies segmentation by dividing the plate assembly into multiple individual plates stacked together, with fluid films formed between each adjacent pair of plates. This creates multiple discrete damping zones that can independently respond to applied forces. The segmented structure allows the damper to handle a wider range of input conditions compared to conventional single-chamber devices, while the modular plate design maintains manufacturing simplicity.
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 damper effectively attenuates high intensity short duration overloads by converting kinetic energy into heat, reducing the impact of transient force peaks and providing a self-compensating damping behavior that adapts to changing input conditions, thus protecting equipment from vibrations and shocks.
Implementation Method 1
a film of viscous fluid between each pair of adjacent plates... each individual plate forming a piston for working on the volume of the working fluid between it and the next plate... the plates being axially movable towards and away from each other, at least a portion of the working fluid being squeezed out from between the plates in response to an axial compressive load
Data Source
AI summary
A compensating damper comprises opposed working end faces, a hermetically sealed chamber between the working end faces, and a set of plates in the chamber with a film of viscous fluid between each pair of adjacent plates. The damper has at least two different film thickness zones across the set of plates, each of the different film thickness zones providing a different resistance response when acted upon by an outside force exerted on at least one of the opposed working end faces. Multiple internal guide pins may extend axially from the opposed working end faces for engaging the plate stack partially from each of said working end faces to increase the stroke while providing for a compact damper. The plates may have a conical configuration to providing dampening in different plans.