Acoustics of the jarana jarocha

Boullosa, Ricardo R.; Gómez, Sara R.

doi:10.1016/j.apacoust.2013.10.014

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Recently, speckle streak patterns have been employed to study vibrations on stringed musical instruments such as the guitar [9], the jarana [10] and the violin [11]. Using musical instruments as educational tools to teach physics is interesting, e.g.…”

Section: Introductionmentioning

confidence: 99%

Speckle interference for naked-eye detection of vibrations

Córdova,

Limón,

Torres

2024

Eur. J. Phys.

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An affordable optical project for students is explained in this work. The experiment only requires a handheld laser illuminating a structure with stationary vibrations induced, but the interpretation of this phenomenon demands a strong understanding of optical interference and modal behavior of a bar. The operating principle employs the speckle phenomenon, which is a type of interference between coherent light incident on a rough surface and its reflection. This interference occurs in a luminous plane outside of the vibrating object and shows a granular structure due to the brightness fluctuations. Speckle is static but if the surface illuminated oscillates, the plane of interference moves from one side to the other, causing a streak pattern. Mode shapes of the object under examination can be naked eye detected from streak patterns. What is more, this phenomenon can be photographed using a manual focus digital camera. Therefore all the components of the procedure can be available (or acquired) by almost any physics laboratory, at any level, which would be unthinkable for optical experiments just a few years ago.

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Section: Introductionmentioning

confidence: 99%

Speckle interference for naked-eye detection of vibrations

Córdova,

Limón,

Torres

2024

Eur. J. Phys.

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“…There is extensive research on the modal behavior of many families of instruments [9,10], such as the cordophones (guitars, pianos, cellos, etc.) [11][12][13][14][15]. For the family of membranophones, numerous studies focus on aspects of membranes such as their modal behavior, radiation patterns [9,[16][17][18][19], and how the vibratory behavior of the cylinder conforms to the shell [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and Structural Features with Respect to the Modal Behavior of a Carbon Fiber-Reinforced Epoxy Drum Shell

2019

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This work evaluates the use of structural aspects in the manufacture of drum shells based on their modal behavior. The drum shells are made of composite carbon fiber-reinforced epoxy (CFRE) due to the structural variables commonly used in the industry for the manufacture of these musical instruments. Musicians consider the shell of a membranophone to be responsible for the differences in timbre between different instruments. Normally, this variation focuses attention on the mechanical characteristics of the material and on the overall thickness of the cylinder that forms the shell. Some manufacturers, especially those that use metals and composites, resort to low thicknesses, below 2 mm, which forces them to use structural reinforcements at the edges of the cylindrical shell to avoid deformations due to the tension generated by the membranes. As shown in this research work, these structural elements have great relevance within the acoustic behavior of the drum shell. Comparisons are made among the frequencies obtained for the different vibrational modes by using finite element simulations, establishing the length of the structural solution previously mentioned and the number of plies of composite laminate as design variables, starting from the characteristics of a real case constructed with CFRE and concluding with experimental validation. The range of study is limited to the values of the frequencies generated by the membranes. The results demonstrate that the use of different manufacturing variables can lead to savings in production costs without compromising the modal behavior of the shell.

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“…Modal analysis has been frequently used as an effective tool to describe natural vibrations of many classical string instruments, such as the violin (Marshall, 1985;Skrodzka et al, 2009;2013;, the guitar (Skrodzka et al, 2011;Torres, Boullosa, 2009), the cello (Fouilhe et al, 2011), and less commonly used instruments, such as the Russian balalaika (Morrison, Rossing, 2001), the kantele (Penttinen et al, 2005), and the jarana jarocha (Boullosa, Gomez, 2014). An interesting instrument, not studied so far, is the Savart trapezoidal violin, or boxfiddle.…”

Section: Introductionmentioning

confidence: 99%

Modal Analysis of a Trapezoidal Violin Built After the Description of Félix Savart

Duerinck

Skrodzka²,

Linde

2015

Archives of Acoustics

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One-dimensional experimental modal analysis of an unvarnished trapezoidal violin built after the description of F. Savart and an anonymous trapezoidal violin on display in the Music Instrument Museum of Brussels is described. The analysis has revealed ten prominent modes. A mode that may potentially play a role of the "tonal barometer" of the instrument is pointed out. The mode shapes are symmetric and of high amplitude, due to the construction of the instrument. Subjective evaluation of the sound quality demonstrated no pronounced difference between the trapezoidal violin and normal violin.

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Acoustics of the jarana jarocha

Cited by 5 publications

References 3 publications

Speckle interference for naked-eye detection of vibrations

Speckle interference for naked-eye detection of vibrations

Manufacturing and Structural Features with Respect to the Modal Behavior of a Carbon Fiber-Reinforced Epoxy Drum Shell

Modal Analysis of a Trapezoidal Violin Built After the Description of Félix Savart

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