Carbon Composite Stringed Instruments Acoustic Optimization

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Solution Overview

Problem

There is a need for improved methods and apparatus for constructing stringed musical instruments using carbon composite materials that offer fine-tuning control and tone quality comparable to traditional wood-based instruments, while being stronger and more cost-effective, with reduced sensitivity to environmental changes and the use of endangered wood.

Innovation Solution

The method involves manufacturing stringed musical instruments using 3K carbon fiber fabrics pre-impregnated with epoxy, combined with low-density expandable epoxy foam, through processes like cutting, compression molding, injection molding, CNC operations, and assembly techniques to produce geometrically identical instruments with enhanced strength and tone quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If carbon fiber composites are used to substitute wood components, then strength and weight properties are improved, but tone quality and fine-tuning control may deteriorate

Engineering Contradiction:

Improveinstrument strengthVSAvoidtone quality consistency

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent uses carbon fiber composite materials with specific weave patterns (plain weave, twill weave, satin weave) and fiber orientations (0°, 45°, 90°, -45°) to create instrument components that maintain both structural strength and acoustic properties. The composite structure allows optimization of mechanical and acoustic characteristics simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different regions of the instrument body are constructed with different carbon fiber layer configurations, densities, and orientations to optimize local acoustic properties. The top plate, back plate, and ribs have tailored composite structures to achieve desired tone quality in different areas while maintaining overall strength.

Inventive Principle:

Principle #3Local quality

2Reliability

If traditional wood-based instruments are used, then fine-tuning control and tone quality are maintained, but sensitivity to environmental changes increases

Engineering Contradiction:

Improvetone quality controlVSAvoiddimensional stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent controls the chemical composition and physical parameters of the carbon fiber composite materials to achieve dimensional stability. The resin matrix composition and curing parameters are optimized to minimize thermal expansion and moisture absorption, ensuring the instrument maintains its geometric precision across environmental conditions.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If carbon composite materials are used, then manufacturing precision and repeatability are improved, but manufacturing complexity increases

Engineering Contradiction:

Improvegeometric consistencyVSAvoidmanufacturing process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The instrument is divided into separate carbon fiber composite components (top plate, back plate, ribs, neck, fingerboard) that can be manufactured independently using standardized mold sets. This segmentation allows each component to be optimized and manufactured with high precision using automated composite layup and curing processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Molds and tooling are prepared in advance with precise geometric features that define the final instrument dimensions. Carbon fiber pre-pregs are pre-cut and pre-positioned according to design specifications before assembly, ensuring geometric consistency across multiple instruments.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If wood-based instruments are used, then traditional craftsmanship and tone quality are achieved, but cost and availability of materials increase

Engineering Contradiction:

Improvetone qualityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent uses carbon fiber composite materials that can be manufactured more consistently and at lower cost than premium tonewoods. The composite materials eliminate the need for expensive hand-crafting processes while maintaining or improving tone quality, making instruments more accessible and cost-effective.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 method results in stringed musical instruments that are stronger, less sensitive to environmental changes, and cost-effective, with consistent tone quality, eliminating the need for fine hand-crafted skills and reducing the risk of damage during shipping.

Implementation Method 1

low-density expandable epoxy foam

Methodology Applied

Scientific EffectExpandable foam expansion: Foam

Implementation Method 2

3K carbon fiber fabrics pre-impregnated with epoxy

Methodology Applied

Scientific EffectEpoxy curing: Chemical Bonding

Data Source

PatentUS10818274B2Apparatus and methods for carbon composite stringed instruments

Publication Date: 2020.10.27 GLASSER ANDREW

AI summary

A method of producing and assembling carbon composite based stringed musical instruments. The assembled stringed musical instrument is relatively inexpensive, extremely sturdy, light weight and simulates tones as deep and resonant as obtained by any other wood based instruments. The method also provides for manufacturing geometrically identical stringed musical instruments and the method being adaptable for producing and assembling any stringed musical instrument.