Friction-Damped Inserts for Resonance-Prone Structural Components

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Solution Overview

Problem

Existing mechanical and civil engineering systems face excessive noise and vibration issues due to resonance, which current damping solutions inadequately address, particularly in high-volume manufacturing where structural integrity and damping capacity are compromised.

Innovation Solution

A non-flat solid, highly damped insert made of flexible material is embedded or attached to system components during molding, featuring inner and outer surfaces with perforations for enhanced bonding and thermal compatibility, allowing for tailored damping capacity and frictional energy dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pre-treating insert surfaces to avoid complete bonding is used, then sliding interface between insert and component is developed, but insufficient overall bonding between insert and component surfaces occurs which impacts structural integrity

Engineering Contradiction:

Improvefriction damping effectivenessVSAvoidbonding strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The insert surface is segmented into two functional zones: outer surfaces that remain untreated for friction damping, and inner surfaces that are selectively treated or exposed through perforations for bonding. This segmentation allows simultaneous achievement of sliding interface for damping and sufficient bonding for structural integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the insert surface are given different properties: the outer surfaces maintain their original characteristics for friction-based damping, while specific inner regions (at perforations or selected areas) are modified to enhance bonding with the component material, achieving local optimization of both functions.

Inventive Principle:

Principle #3Local quality

2Reliability

If CAE and EMA tools are used to modify stiffness or mass to prevent resonance, then resonant vibration can be prevented, but the procedures are expensive and time-consuming

Engineering Contradiction:

Improveresonance preventionVSAvoidmodification time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces complex computational analysis and iterative design modification (CAE/EMA) with a straightforward mechanical damping solution. By embedding friction-based damping inserts, the system passively attenuates resonant vibrations through frictional energy dissipation, eliminating the need for expensive and time-consuming stiffness or mass modifications.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Instead of modifying fundamental system parameters like stiffness or mass through complex redesign, the invention changes the damping parameter by introducing friction-based energy dissipation mechanisms. This simple parameter change effectively reduces resonant response without requiring extensive analysis or redesign cycles.

Inventive Principle:

Principle #35Parameter changes

3Strength

If common engineering materials are used for structural components, then structural integrity is maintained, but relatively low damping capacity results in low overall system damping

Engineering Contradiction:

Improvestructural integrityVSAvoiddamping capacity

Core Design Contradiction:

StrengthVSLoss of energy

Solution Approach 1:

The patent creates a composite system combining common structural materials with specialized damping inserts. The structural component maintains its original material properties for strength and integrity, while the embedded insert provides high damping capacity through friction mechanisms, achieving superior overall damping without compromising structural requirements.

Inventive Principle:

Principle #40Composite materials

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 effectively increases the damping capacity of engineering systems, reducing resonant vibrations and noise while maintaining structural integrity across varying temperatures and manufacturing conditions.

Implementation Method 1

coulomb friction develops from relative movement at the interface between the opposing solid surfaces

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

allow a limited infiltration of the molten casting material inside the layer of material for the additional spot rigid bonding between the component and insert inner surfaces

Methodology Applied

Scientific EffectBonding: Chemical Bonding

Data Source

PatentUS11062686B2Friction damped component for highly stress engineering components

Publication Date: 2021.07.13 FORD GLOBAL TECH LLC

AI summary

Damped highly stressed engineering components are disclosed. The disclosed inventive concept provides a method and system for increasing the damping capacity of an engineering system by adding a non-flat solid, highly damped insert to a system component that contributes most to the system's dynamic response. A friction damped insert can either be embedded into the damped components during casting or fastened to the outer surface of the damped component. The insert is made of the single layer of flexible material by forming it into a rigid elongated body. The layer of material can be turned over on itself without folding to create a cylinder or can be folded over a number of times to create a prismatic bar. The layer of material may be shaped into a corrugated panel. The layer of flexible material may have a number of relatively small openings or perforations with a uniform spatial distribution.