Multi-modal tuning of vibrating bars with simplified undercuts using an evolutionary optimization algorithm

Soares, Filipe; Antunes, José; Debut, Vincent

doi:10.1016/j.apacoust.2020.107704

Cited by 10 publications

(8 citation statements)

References 13 publications

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“…The tuning of a snare, for example, is often decided from an isolated reference point, focusing on the sonic qualities of the snare itself, rather than from a place of understanding how a particular tuning may compliment other concurrent spectral and harmonic colours. The closest that western cultural practices come to this timbral understanding is through the idea of 'tuned percussion', which is largely influenced by an anterior musical discourse surrounding harmonic instruments, and often centres around percussive instruments having their timbral content skewed to more closely replicate the harmonic series [5,6]. This notion is not strictly the case across all cultural practices, with many examples of Indonesian gamelan ensembles tuning their percussion instruments to instead complement one another [7].…”

Section: Cultural Backgroundmentioning

confidence: 99%

Towards Orchestrating Physically Modelled 2D Percussion Instruments

Wolstanholme,

McPherson

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Contemporary orchestration practice harbours a number of aesthetic inquiries relating to the employment and arrangement of percussion instruments. Due in part to the fact that percussion instruments largely occupy an inharmonic timbre space, they encompass a diverse and distinctly nuanced musical idiom in comparison to harmonic instruments, both in terms of their textural interplay, musical function and cultural significance. In response to this perspective, we present a neural network approach to the parameter estimation of physically modelled, abstract percussion instruments. The approach presented here serves as our initial attempt towards creating a computer-assisted orchestration methodology specifically targeting the musical employment and arrangement of inharmonic timbres and percussive instruments. The neural architecture presented here has been trained and tested using a pair of two-dimensional physical models, to gauge a sense of our architecture's successes and limitations as we continue to expand this approach to include more two-dimensional models. This works poses as our first technological inquiry into this field, which has here been quantitatively assessed, with plans to undertake more rigorous and comparative tests in the near future.

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Section: Cultural Backgroundmentioning

confidence: 99%

Towards Orchestrating Physically Modelled 2D Percussion Instruments

Wolstanholme,

McPherson

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…In general, if the error function describes frequency deviations only, an "ideal" global optimum (with error arbitrarily close to zero) can only be found if the number of design variables is equal to or larger than the number of defined targets. 9 In recent work, 19 the authors have used a discontinuous undercut shape with the aim of alleviating the manufacturing complexity. This profile definition provides, in a compact parameter space, a wide diversity of possible geometries.…”

Section: Model Description a Undercut Modelmentioning

confidence: 99%

“…As an example, we illustrate here a previously studied approach 19 to minimize the amount of material extracted, which may be an important consideration from the point of view of manufacturing. The percentage of volume of extracted material, with respect to the original bar volume (uniform beam), is given by…”

Section: Optional Additional Penaltiesmentioning

confidence: 99%

“…where 0 a 1 is a weighting factor on the volumetric penalty, i.e., if a ¼ 0, the volumetric constraint is not accounted for; if a ¼ 1, only the volumetric condition is accounted for. In our recent work, 19 the interested reader can find a report on the impacts of using such penalty as well as appropriate values for the weighting factor a. Here, the function V may be replaced by any other to satisfy a particular characteristic of the beam geometry.…”

Section: Optional Additional Penaltiesmentioning

confidence: 99%

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Tuning of bending and torsional modes of bars used in mallet percussion instruments

Soares

Antunes

Debut

2021

The Journal of the Acoustical Society of America

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The present paper proposes a generic design-optimization procedure for the concomitant tuning of bending and torsional modes of bars used in mallet percussion instruments. The undercut model uses a series of discontinuous cuts aimed to facilitate the manufacturing process. Compared to one-dimensional beam models, the use of three-dimensional (3-D) finite element modeling not only allows for the calculation of torsional modes but also provides an increased accuracy in the prediction of modal frequencies, an important aspect when dealing with the demanding tuning tolerances required in a musical context. A global optimization problem is formulated and solved using a surrogate function algorithm, which enables fast computations even with the expensive function evaluations associated with 3-D finite element models. Modal identification of experimental bars demonstrates the potential of the proposed procedure, leading to bars with demanding tuning ratios (six target frequencies) at absolute tuning deviations typically below 15 cents. Measurements of the radiated sound from the experimental bars illustrate the benefits of the improved designs compared to those without torsional tuning. The proposed framework, aside from dealing with the comprehensive tuning of percussive musical bars, also accounts for important practical considerations regarding efficient optimization, modeling accuracy, and manufacturing complexity.

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“…Noise is an unwanted sound or sound source which can have an impact on human health and comfort. According to experts, a sound that exceeds the level of the human listening senses can cause deafness (Cianferra, Petronio, & Armenio, 2019;Soares, Antunes, & Debut, 2021). In operating a tool, noise is a significant problem, especially in terms of comfort (Learn, 2021;Zhang, 2020).…”

Section: Introductionmentioning

confidence: 99%

Noise Level Analysis of KM. Sabuk Nusantara 71 to Increase Ship Passengers Comfort Based on BKI Rules

Sugeng

Ridwan

Sulaiman

et al. 2021

TEKNIK

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Noise is an unwanted sound or sound source which can distract or harm human health and comfort. According to experts, a sound that exceeds the level of human listening senses can cause deafness. Such danger can also be found in ships. An alternative to reduce noise in ships is by modifying the construction. This research aims to compare noising before and after adding a side deck girder in the engine room of a 2000 DWT ship. The result showed that in the engine room, after adding a FB 180 x 8 mm FP 75 x 10 mm sized T profile, for 0-30 seconds intervals, the maximum noise was down from 127 dB to 62 dB or a 0.47% decrease. Meanwhile, the maximum noise was down from 98.6 dB to 57 dB in the accommodation room or decreased by 0.41%. The maximum noise was down from 83 dB to 37 dB or a 0.56% decrease in the navigation room. Such modification had reduced the average noise range from 80-40 dB to 55-20 dB.

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Multi-modal tuning of vibrating bars with simplified undercuts using an evolutionary optimization algorithm

Cited by 10 publications

References 13 publications

Towards Orchestrating Physically Modelled 2D Percussion Instruments

Towards Orchestrating Physically Modelled 2D Percussion Instruments

Tuning of bending and torsional modes of bars used in mallet percussion instruments

Noise Level Analysis of KM. Sabuk Nusantara 71 to Increase Ship Passengers Comfort Based on BKI Rules

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