Stringed Instrument Body Protrusion Rigidity Adjustment
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Solution Overview
Problem
The vibration characteristics of stringed instruments with formed protrusions on their bodies are suboptimal, leading to attenuated string vibration and compromised sound quality due to energy consumption by the body and neck, necessitating an improvement in the body's vibration characteristics.
Innovation Solution
A body unit with protrusions and a rigidity adjusting member affixed to suppress bending deformation, comprising a fiber-reinforced member with oriented fibers, extending from the central portion to the protrusions to adjust the body's rigidity and enhance vibration frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If protrusions are formed on the body for playability and appearance design, then ease of operation and appearance are improved, but vibration characteristics deteriorate leading to attenuated string vibration
Solution Approach 1:
The rigidity adjusting member is selectively positioned only at the protrusion portions of the body, creating local reinforcement without affecting the overall vibration characteristics of the main body. This allows the protrusions to maintain their playability function while locally suppressing unwanted bending deformation
Solution Approach 2:
The rigidity adjusting member uses fiber-reinforced material with oriented fibers that provide enhanced stiffness-to-weight ratio. This composite structure allows localized reinforcement of the protrusions without significantly increasing the overall weight of the instrument body
2Reliability
If the body rigidity is increased to improve vibration characteristics, then sound quality is improved, but weight increases
Solution Approach 1:
Instead of uniformly increasing the rigidity of the entire body, the rigidity adjusting member is applied only to the protrusion portions where structural reinforcement is needed. This localized approach improves vibration characteristics while minimizing the addition of weight
Solution Approach 2:
The fiber-reinforced rigidity adjusting member provides high stiffness-to-weight ratio, achieving the desired rigidity improvement with minimal weight penalty compared to traditional solid material reinforcement
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 raises the natural frequencies of both torsional and bending modes, improving sound quality by reducing bending deformation and increasing the body's rigidity while maintaining a lightweight design.
Implementation Method 1
a rigidity adjusting member 12 that is affixed to the body unit 11 and that suppresses bending deformation of the protrusion 14 in the body unit 11
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A body for a stringed instrument includes a body unit having a protrusion, and a rigidity adjusting member that extends from a central portion of the body unit and that is affixed to the body unit.