3D Modeling of a Guitar Using a Computer Tomography Scan

TL;DR

This paper presents a method for creating a detailed 3D model of an acoustic guitar using CT scans, capturing internal and external structures without disassembly, to aid vibro-acoustic simulations.

Contribution

It introduces a non-invasive CT scanning approach to accurately model internal and external guitar structures for acoustic analysis.

Findings

Generated approximately 2000 cross-sectional images

Created a detailed 3D geometric model of the guitar

Enabled internal structure analysis without disassembly

Abstract

This paper describes the development of a detailed 3D geometric model of an acoustical guitar. Modeling an instrument is a sophisticated task considering the individual parts and their complex shapes. The geometry of the parts visible from the outside can be measured using appropriate tools, but it is very difficult to measure the details of the internal parts like bracing, heels, and other features by hand through the sound hole. Otherwise, it would be necessary to disassemble the guitar to measure the precise position and dimensions of the parts inside it. Reassembling the guitar could result in improper functioning. To avoid damaging the instrument by disassembling or taking inaccurate measurements through the sound hole, a computer tomography (CT) scan of the guitar body was performed. Using this method, cross-sectional images of the guitar body in all the three dimensions were extracted with 1 mm spacing between adjacent images. In total, approximately 2000 images were generated and used in developing the geometric model of the guitar. The 3D model will be further used to develop a vibro-acoustic simulation model of the guitar