Fluorochemical Acrylate String Coating for Decay Rate
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Solution Overview
Problem
Existing methods for increasing the sound pressure or duration of vibrating strings in stringed musical instruments require higher forces, which can damage the strings, necessitating a method to enhance decibel level decay rate without increasing the force applied.
Innovation Solution
Coating strings with a thin film of fluorochemical acrylate polymer in a hydrofluoroether solvent, which is non-flammable and free of volatile organic compounds, to improve decibel level decay rate without increasing the force required for vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If larger force is applied to strings to increase sound pressure or duration, then the sound pressure level and duration are improved, but the strings may be damaged
Solution Approach 1:
The patent applies a coating with specific physical properties (low surface energy, thin film less than one micron thick) to change the surface parameters of the string. This modification alters the interaction between the string and air molecules, reducing energy loss during vibration and thereby extending sound wave duration without requiring increased excitation force that would damage the string
Solution Approach 2:
The patent uses a composite coating system consisting of fluorochemical acrylate polymer in a hydrofluoroether solvent. This composite material combines the benefits of low surface energy (from fluorochemical content) with appropriate film-forming properties (from acrylate polymer), creating a thin protective layer that reduces damping while maintaining string integrity
2Stress or pressure
If larger force is applied to strings to increase sound pressure level, then the loudness is improved, but the strings may be damaged
Solution Approach 1:
The coating modifies the surface parameters of the string to reduce energy dissipation to surrounding air molecules. By changing the surface energy characteristics through fluorochemical content, the string maintains higher sound pressure levels for longer periods without requiring increased excitation force, thus protecting string integrity
Solution Approach 2:
The patent replaces the mechanical approach of increasing excitation force with a physical chemistry approach using surface coating. Instead of applying more force mechanically, the solution uses molecular-level surface modification to reduce aerodynamic damping, substituting a chemical/physical mechanism for a mechanical one
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 coating results in a slower decibel level decay rate, enhancing the perceived loudness of the strings without the need for increased force, as demonstrated by comparative sound pressure tests showing comparable or slightly higher maximum decibel levels and lower decay rates for coated strings.
Implementation Method 1
The coating results in a film that has low surface energy values and a thickness of less than one micron
Data Source
AI summary
Methods and apparatus for improving the decibel level decay characteristics of excited strings for stringed musical instruments.