Friction-Damped Insert Structure for Resonance Control
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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 materials with low damping capacity are used, leading to structural integrity concerns and inefficiencies in damping enhancement.
Innovation Solution
A non-flat solid, highly damped insert made of flexible material is embedded or attached to system components during the molding process, featuring inner and outer surfaces with perforations for enhanced bonding and thermal compatibility, allowing for tailored damping capacity adjustments to mitigate resonance-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
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
Solution Approach 1:
The insert surface is treated non-uniformly: the first surface receives a coating or treatment that prevents complete bonding to allow sliding interface, while the second surface remains untreated or differently treated to ensure strong bonding with the component. This local differentiation resolves the contradiction by providing both sliding capability and structural integrity in different locations of the same component.
2Productivity
If materials with low damping capacity are used in high-volume manufacturing, then manufacturing efficiency is maintained, but excessive noise and vibration occur due to resonance
Solution Approach 1:
The system uses a composite structure combining the component material (for structural requirements and manufacturing efficiency) with a damping material applied to the insert surface (for vibration control). This composite approach allows high-volume manufacturing to proceed with standard materials while adding damping functionality through the surface treatment, thereby reducing noise and vibration without sacrificing productivity.
3Reliability
If CAE and EMA tools are used to modify stiffness or mass to prevent resonance, then resonant vibration can be controlled, but the process becomes expensive and time-consuming
Solution Approach 1:
Instead of modifying the fundamental stiffness or mass parameters of the component through expensive CAE analysis and iterative design changes, the invention applies a damping treatment to the insert surface that changes the energy dissipation characteristics of the system. This parameter change approach achieves resonance control through a simpler, faster process that does not require extensive computational analysis or redesign cycles.
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 resonance and associated noise and vibration, while maintaining structural integrity and minimizing temperature-related damping variations across a wide operational temperature range.
Implementation Method 1
the layer of material can be turned over and over on itself without folding to create a cylinder or it can be folded over a number of times to create a prismatic bar... if the insert body is subjected to dynamic loading, its vibrational energy may be dissipated by frictional contact at the corresponding inner surfaces
Implementation Method 2
the layer of material may have a number of relatively small openings or perforations to 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 during the casting process
Data Source
AI summary
A friction damped insert for highly stressed engineering components is 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. The insert can either be embedded into a system component during casting or be fastened to the system component outer surface. 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.