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Burgos-Pintos Á, Fernández-Zacarías F, Mayuet PF, Hernández-Molina R, Rodríguez-Parada L. Influence of 3D Printing Direction in PLA Acoustic Guitars on Vibration Response. Polymers (Basel) 2023; 15:4710. [PMID: 38139961 PMCID: PMC10747113 DOI: 10.3390/polym15244710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/07/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023] Open
Abstract
The design of musical instruments is a discipline that is still carried out in an artisanal way, with limitations and high costs. With the additive manufacturing technique, it is possible to obtain results for the generation of not only electrical but also acoustic instruments. However, it is necessary to generate a procedure to evaluate the influence of the process on the final result of the acoustics obtained. This study focuses on investigating the relationship between the construction of acoustic guitars and their final sound. The reinforcement structures at the top of the instrument are analysed, as well as how this design affects the vibratory behaviour of the top in the first five vibratory modes. Specifically, this article presents a procedure for the design of customised acoustic guitars using additive manufacturing through parametrisation and a vibrational analysis of the designed tops using finite element (FEA) and experimental physical tests, in order to develop a methodology for the study of stringed instruments. As a result, an 11% increase in the high-frequency response was achieved with a printing direction of +45°, and a reduction in the high-frequency response with ±45°. In addition, at high frequencies, a relative error of 5% was achieved with respect to the simulation. This work fulfils an identified need to study the manufacture of acoustic guitars using polylactic acid (PLA), and to be able to offer the musician a customised instrument. This represents a breakthrough in the use of this manufacturing technology, extending its relationship with product design.
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Affiliation(s)
- Álvaro Burgos-Pintos
- Department of Mechanical Engineering & Industrial Design, Faculty of Engineering, University of Cadiz, Av. University of Cadiz 10, 11519 Puerto Real, Spain; (Á.B.-P.); (F.F.-Z.); (R.H.-M.); (L.R.-P.)
| | - Francisco Fernández-Zacarías
- Department of Mechanical Engineering & Industrial Design, Faculty of Engineering, University of Cadiz, Av. University of Cadiz 10, 11519 Puerto Real, Spain; (Á.B.-P.); (F.F.-Z.); (R.H.-M.); (L.R.-P.)
- Acoustic Engineering Laboratory, University of Cadiz, 11519 Cadiz, Spain
| | - Pedro F. Mayuet
- Department of Mechanical Engineering & Industrial Design, Faculty of Engineering, University of Cadiz, Av. University of Cadiz 10, 11519 Puerto Real, Spain; (Á.B.-P.); (F.F.-Z.); (R.H.-M.); (L.R.-P.)
| | - Ricardo Hernández-Molina
- Department of Mechanical Engineering & Industrial Design, Faculty of Engineering, University of Cadiz, Av. University of Cadiz 10, 11519 Puerto Real, Spain; (Á.B.-P.); (F.F.-Z.); (R.H.-M.); (L.R.-P.)
- Acoustic Engineering Laboratory, University of Cadiz, 11519 Cadiz, Spain
| | - Lucía Rodríguez-Parada
- Department of Mechanical Engineering & Industrial Design, Faculty of Engineering, University of Cadiz, Av. University of Cadiz 10, 11519 Puerto Real, Spain; (Á.B.-P.); (F.F.-Z.); (R.H.-M.); (L.R.-P.)
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Rennoll V, McLane I, Eisape A, Grant D, Betz C, Chen X, Gebhart M, Hahn H, Kartub S, Lehr B, Suárez CM, Smith R, Tingen N, Tyra T, Yang F, E West J. Project-based learning through sensor characterization in a musical acoustics course. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 152:1932. [PMID: 36182282 DOI: 10.1121/10.0014171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 08/24/2022] [Indexed: 06/16/2023]
Abstract
Project-based learning engages students in practical activities related to course content and has been demonstrated to improve academic performance. Due to its reported benefits, this form of active learning was incorporated with an ongoing research project into an introductory, graduate-level Musical Acoustics course at the Peabody Institute of The Johns Hopkins University. Students applied concepts from the course to characterize a contact sensor with a polymer diaphragm for musical instrument recording. Assignments throughout the semester introduced students to completing a literature review, planning an experiment, collecting and analyzing data, and presenting results. While students were given broad goals to understand the performance of the contact sensor compared to traditional microphones, they were allowed independence in determining the specific methods used. The efficacy of the course framework and research project was assessed with student feedback provided through open-ended prompts and Likert-type survey questions. Overall, the students responded positively to the project-based learning and demonstrated mastery of the course learning objectives. The work provides a possible framework for instructors considering using project-based learning through research in their own course designs.
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Affiliation(s)
- Valerie Rennoll
- Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Ian McLane
- Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Adebayo Eisape
- Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Drew Grant
- Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Claudius Betz
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - Xinyao Chen
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - Michael Gebhart
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - Helena Hahn
- Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Samuel Kartub
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - Brenden Lehr
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | | | - Randall Smith
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - Noah Tingen
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - Thomas Tyra
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - Fengji Yang
- Peabody Institute of The Johns Hopkins University, Baltimore, Maryland 21202, USA
| | - James E West
- Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
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A Statistical Approach to Violin Evaluation. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12147313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Comparing violins requires competence and involves both subjective and objective evaluations. In this manuscript, vibration tests were performed on a set of 25 violins, both historical and new. The resulting bridge admittances were modeled in the low and mid-frequency ranges through a set of objective features. Once projected into the new representation, the bridge admittances of three historical violins made by Stradivari and a famous reproduction revealed high similarity. PCA highlighted the importance of signature mode frequencies, bridge hill behavior, and signature mode amplitudes in distinguishing different violins.
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Giordano N, Chatziioannou V. Status and future of modeling of musical instruments: Introduction to the JASA special issue. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2021; 150:2294. [PMID: 34598593 DOI: 10.1121/10.0006439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 09/07/2021] [Indexed: 06/13/2023]
Abstract
Over the last decades, physics-based modeling of musical instruments has seen increased attention. In 2020 and 2021, the Journal of the Acoustical Society of America accepted submissions for a special issue on the modeling of musical instruments. This article is intended as an introduction to the special issue. Our purpose is to discuss the role that modeling plays in the study of musical instruments, the kinds of things one hopes to learn from modeling studies, and how that work informs traditional experimental and theoretical studies of specific instruments. We also describe recent trends in modeling and make some observations about where we think the field is heading. Overall, our goal is to place the articles in the special issue into a context that helps the reader to better understand and appreciate the field.
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Affiliation(s)
- Nicholas Giordano
- Department of Physics, Auburn University, Auburn, Alabama 36849, USA
| | - Vasileios Chatziioannou
- Department of Music Acoustics, University of Music and Performing Arts Vienna, 1030 Vienna, Austria
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