Compression-Only Vibration Damping Link for Lightweight Isolation
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Solution Overview
Problem
Conventional vibration isolation methods, such as those using metallic springs, fluid dampers, and elastomeric designs, face challenges in effectively damping high-frequency vibrations and are often heavier, more expensive, and less reliable, particularly in aerospace applications where weight and reliability are critical.
Innovation Solution
A tension and compression vibration damper comprising a frame, a shaft, and two vibration isolators arranged oppositely to apply compressive forces only, eliminating the need for bonding with other materials and mechanical connections that load the dampening material in tension, and incorporating displacement limiting members to restrict movement and enhance damping efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic springs are used to dampen vibrations, then vibration damping capability is improved, but weight increases and fatigue sensitivity worsens
Solution Approach 1:
The patent replaces metallic springs (mechanical system) with an elastomeric vibration isolator that utilizes material viscoelasticity and hysteresis damping. The elastomer absorbs vibration energy through internal friction and molecular relaxation, eliminating the need for heavy metallic spring structures while providing effective vibration isolation.
Solution Approach 2:
The patent employs elastomeric materials with specific durometer ranges (e.g., 30-90 Shore A) that combine flexibility for vibration isolation with sufficient strength for structural support. The elastomer's composite properties enable simultaneous weight reduction and vibration damping performance.
2Reliability
If fluid dampers are used to dampen vibrations, then vibration damping is improved, but weight increases and response speed to high frequency vibrations worsens
Solution Approach 1:
The patent replaces fluid dampers (mechanical system with fluid dynamics) with solid elastomeric isolators that respond instantaneously to vibration inputs. The elastomer's molecular structure allows immediate energy absorption across the full frequency spectrum, including high-frequency vibrations that fluid dampers cannot effectively address due to fluid inertia and compressibility.
3Reliability
If elastomeric designs are used where ends are bonded to links, then vibration isolation is achieved, but complexity of bonding and mechanical connections increases
Solution Approach 1:
The patent extracts and eliminates the bonding and mechanical connection elements from the vibration isolation system. The elastomeric isolator is designed as a standalone component with integrated mounting features (e.g., eyelets, loops, or flanges) that directly attach to structural points, removing the need for separate bonding agents or mechanical fasteners while maintaining effective vibration isolation.
Solution Approach 2:
The patent combines the vibration damping function with the mounting structure into a single integrated elastomeric component. The isolator's own structure provides both the damping mechanism and the attachment means, eliminating the need for separate bonding or mechanical connection systems.
4Reliability
If conventional vibration dampers are used, then vibration damping is achieved, but weight increases and cost increases
Solution Approach 1:
The patent employs elastomeric vibration isolators that are lighter and more cost-effective than conventional metallic or fluid dampers. While elastomers have limited service life compared to metals, their low cost and lightweight nature make them economically advantageous for applications where periodic replacement is acceptable, particularly in aerospace and automotive industries.
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 provides a simpler, lighter, and more reliable vibration damping system that effectively absorbs both tension and compression loads by using compressive forces only, reducing weight and operational costs while maintaining high damping efficiency, suitable for aerospace and other industries.
Implementation Method 1
the first vibration isolator and the second vibration isolator are opposingly arranged relative to the second frame end and act only in compression to dampen both tension loads and compression loads
Implementation Method 2
A tension and compression vibration damper comprising a frame, a shaft, and two vibration isolators arranged oppositely to apply compressive forces only, eliminating the need for bonding with other materials and mechanical connections that load the dampening material in tension
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A vibration damper (210, 210A, 210B, 210C) including a frame (300) having at least a first cavity (310), a frame first end (300E1) and a frame second end (300E2) spaced from the frame first end (300E1); a shaft (330) slidably coupled to and extending into the frame (300) where the shaft (330) extends through the first cavity (310); a first vibration isolator (340) disposed within the first cavity (310) where the shaft (330) extends through the first vibration isolator (340) so as to capture the first vibration isolator (340) within the first cavity (310) where the first vibration isolator (340) interfaces with the frame second end (300E2); and a second vibration isolator (350) disposed on the shaft (330), where the shaft (330) extends through the second vibration isolator (350) so as to capture the second vibration isolator (350) on the shaft (330) where the second vibration isolator (350) interfaces with the frame second end (300E2) opposite the first vibration isolator (340), where the first vibration isolator (340) and the second vibration isolator (350) act only in compression.