Foam-Pore Damping Metal Sheet for Vibration and Noise Control
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Solution Overview
Problem
Conventional unconstrained vibration damping steel sheets exhibit inferior performance due to the use of polymer resins, limiting their effectiveness in damping vibrations and noise in applications like household appliances and automobiles.
Innovation Solution
An unconstrained vibration damping metal sheet with foam pores is developed, incorporating a metal sheet, an organic-inorganic pretreatment layer, and a foam resin layer containing thermoplastic polyvinyl chloride resin, plasticizer, foaming agent, oxide-based crosslinker, and spherical silica, which enhances vibration damping and sound insulation by forming controlled foam pores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer resins are used in conventional unconstrained vibration damping steel sheets, then the manufacturing process is simple, but the vibration damping performance is inferior
Solution Approach 1:
The patent uses a composite structure consisting of a metal sheet substrate combined with a resin coating layer containing foam pores. This composite material approach allows the simple unconstrained manufacturing process to achieve vibration damping performance comparable to or exceeding constrained structures, resolving the contradiction between manufacturing simplicity and damping effectiveness.
Solution Approach 2:
The resin coating layer contains foam pores with controlled size distribution (average diameter 10-100 μm, porosity 30-70%). These porous structures enhance the vibration damping performance by increasing energy dissipation through air resonance and friction within the pores, while maintaining the simple unconstrained manufacturing process.
2Ease of manufacture
If conventional polymer resins are used, then the coating can be applied simply, but the sound insulation performance is insufficient
Solution Approach 1:
The foam pores in the resin coating layer (porosity 30-70%, average diameter 10-100 μm) provide excellent sound insulation by absorbing acoustic energy through air resonance and friction within the porous structure. This maintains simple coating application while dramatically improving noise blocking performance.
Solution Approach 2:
The patent optimizes specific parameters including foam pore size distribution (10-100 μm average diameter), porosity (30-70%), and resin layer thickness (10-100 μm) to maximize sound insulation performance. These parameter adjustments enhance noise blocking while maintaining 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 metal sheet achieves improved vibration damping and sound insulation performance by effectively converting vibration energy into thermal energy and blocking noise through the viscoelastic properties of the foam pores, outperforming conventional methods in loss factor and sound insulation tests.
Implementation Method 1
implementing vibration damping performance and sound insulation performance using viscoelastic properties of a polymer resin
Implementation Method 2
vibration damping performance and sound insulation performance using viscoelastic properties of a polymer resin and a vibration/noise blocking effect of the foam pores
Data Source
AI summary
Provided is an unconstrained vibration damping metal sheet with foam pores. The unconstrained vibration damping metal sheet of the present invention comprises: a metal sheet; an organic-inorganic pretreatment layer containing an acrylic resin formed on the metal sheet; and a foam resin layer formed on the pretreatment layer, the foam resin layer containing, based on weight: thereof, a thermoplastic polyvinyl chloride resin: 40-80%, a plasticizer: 5-40%, a foaming agent: 0.1-10%, an oxide-based crosslinker: 1-4%, and spherical silica: 1-10%.