Relevant bibliographies by topics / Tuning a marimba bars

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  2. Dissertations / Theses
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Academic literature on the topic 'Tuning a marimba bars'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Tuning a marimba bars"

1

Bretos, J., C. Santamaria, and J. Alonso Moral. "Tuning process of xylophone and marimba bars analyzed by finite element modeling and experimental measurements." Journal of the Acoustical Society of America 102, no. 6 (December 1997): 3815–16. http://dx.doi.org/10.1121/1.420287.

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Suits, B. H. "Basic physics of xylophone and marimba bars." American Journal of Physics 69, no. 7 (July 2001): 743–50. http://dx.doi.org/10.1119/1.1359520.

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Useche, Jorge E., Rafael G. Hurtado, and Federico Demmer. "Interplay between musical practices and tuning in the marimba de chonta music." Journal of New Music Research 48, no. 5 (September 24, 2019): 479–500. http://dx.doi.org/10.1080/09298215.2019.1667399.

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Bork, Ingolf. "Vibration modes and tuning of xylophone bars." Journal of the Acoustical Society of America 85, S1 (May 1989): S32. http://dx.doi.org/10.1121/1.2026911.

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Bork, Ingolf. "Practical tuning of xylophone bars and resonators." Applied Acoustics 46, no. 1 (1995): 103–27. http://dx.doi.org/10.1016/0003-682x(95)93953-f.

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Buana, Utari Arsy. "BENTUK PENYAJIAN LAGU OEMAR BAKRIE DI MARCHING BAND SWATAMI PADA GEBYAR PENDIDIKAN NASIONAL KABUPATEN LABUHANBATU UTARA." Grenek Music Journal 7, no. 1 (January 3, 2018): 92. http://dx.doi.org/10.24114/grenek.v7i1.8790.

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The results showed that one form of emotional expression that is channeledthrough the music and therefore, the group marching band Swatami onarranemen songs Oemar Bakrie brought by Marching band Swatami using threecategories of instrument, namely: instrument Percussion in tone (Glockenspiel,vibraphone, Xylophone, Marimba), brass instruments (trumpet, Mellophone,Baritone, Tuba), and percussion (Senar drum, tenor drum, bass drum, cymbals).Choosing songs Omar bakrie for in the arrangements with the shape Marchingband. Bakrie Oemar tempo songs using 163 has 51 bars and has two variations ofthe melody, the melody forms A and B. Form benuk melodic presentation of thesong sung by Oemar Bakrie Swatami Marching band is a form of selfappreciation for issuing arts talent. Using costumes and makeup of their pridethat seemed interesting and luxurious for a show. Using display / position playersmake this show the higher thevalue of his art.
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Cronin, Beau, Ian H. Stevenson, Mriganka Sur, and Konrad P. Körding. "Hierarchical Bayesian Modeling and Markov Chain Monte Carlo Sampling for Tuning-Curve Analysis." Journal of Neurophysiology 103, no. 1 (January 2010): 591–602. http://dx.doi.org/10.1152/jn.00379.2009.

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A central theme of systems neuroscience is to characterize the tuning of neural responses to sensory stimuli or the production of movement. Statistically, we often want to estimate the parameters of the tuning curve, such as preferred direction, as well as the associated degree of uncertainty, characterized by error bars. Here we present a new sampling-based, Bayesian method that allows the estimation of tuning-curve parameters, the estimation of error bars, and hypothesis testing. This method also provides a useful way of visualizing which tuning curves are compatible with the recorded data. We demonstrate the utility of this approach using recordings of orientation and direction tuning in primary visual cortex, direction of motion tuning in primary motor cortex, and simulated data.
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Swindale, N. v. "Responses of neurons in cat striate cortex to vernier offsets in reverse contrast stimuli." Visual Neuroscience 12, no. 5 (September 1995): 805–17. http://dx.doi.org/10.1017/s0952523800009378.

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AbstractThis paper examines how the responses of cells in area 17 of the cat vary as a function of the vernier offset between a bright and a dark bar. The study was prompted by the finding that human vernier acuity is reduced for bars or edges of opposite contrast sign (Mather & Morgan, 1986; O'Shea & Mitchell, 1990). Both simple and complex cells showed V-shaped tuning curves for reverse contrast stimuli: i.e. response was minimum at alignment, and increased with increasing vernier offset. For vernier bars with the same contrast sign, γ-shaped tuning curves were found, as reported earlier (Swindale & Cynader, 1986). Sensitivity to offset was inversely correlated in the two paradigms. However, complex cells with high sensitivity to offsets in a normal vernier stimulus were significantly less sensitive to offsets in reverse contrast stimuli. A cell's response to a vernier stimulus in which both bars are bright can be predicted by the shape of its orientation tuning curve, if the vernier stimulus is approximated by a single bar with an orientation equal to that of a line joining the midpoints of the two component bars (Swindale & Cynader, 1986). This approximation did not hold for the reverse contrast condition: orientation tuning curves for compound barswere broad and shallow, rather than bimodal, with peaks up to 40 deg from the preferred orientation. Results from simple cells were compared with predictions made by a linear model of the receptive field. The model predicted the V-shaped tuning curves found for reverse contrast stimuli. It also predicted that absolute values of tuning slopes for vernier offsets in reverse contrast stimuli might sometimes be higher than with normal stimuli. This was observed in some simple cells. The model was unable to explain the shape of orientation tuning curves for compound bars, nor could it explain the breakdown of the equivalent orientation approximation.
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Bai, Yuehao, Hung Ho, Guillaume A. Pouliot, and Joshua Shea. "Inference for Support Vector Regression under ℓ1 Regularization." AEA Papers and Proceedings 111 (May 1, 2021): 611–15. http://dx.doi.org/10.1257/pandp.20211035.

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We provide large-sample distribution theory for support vector regression (SVR) with l1-norm along with error bars for the SVR regression coefficients. Although a classical Wald confidence interval obtains from our theory, its implementation inherently depends on the choice of a tuning parameter that scales the variance estimate and thus the width of the error bars. We address this shortcoming by further proposing an alternative large-sample inference method based on the inversion of a novel test statistic that displays competitive power properties and does not depend on the choice of a tuning parameter.
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10

Mulligan, Kathleen, Jong-Nam Kim, and Helen Sherk. "Simulated Optic Flow and Extrastriate Cortex. II. Responses to Bar Versus Large-Field Stimuli." Journal of Neurophysiology 77, no. 2 (February 1, 1997): 562–70. http://dx.doi.org/10.1152/jn.1997.77.2.562.

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Mulligan, Kathleen, Jong-Nam Kim, and Helen Sherk. Simulated optic flow and extrastriate cortex. II. Responses to bar versus large-field stimuli. J. Neurophysiol. 77: 562–570, 1997. In the preceding paper we described the responses of cells in the cat's lateral suprasylvian visual area (LS) to large-field optic flow and texture movies. To assess response properties such as direction selectivity, cells were also tested with moving bar stimuli. We expected that there would be good agreement between response properties elicited with optic flow movies and those revealed with bar stimuli. We first asked how well bar response properties predicted responsiveness to optic flow movies. There was no correlation between responsiveness to movies and the degree of end-stopping, length summation, or preference for bars that accelerated and expanded. We then considered only the 322 cells that responded to both bars and optic flow or texture movies and asked how well the strength of their response to movies could be predicted from the direction-tuning curves generated with bar stimuli. One-third of these cells responded much more strongly to movies than could be predicted from their direction-tuning curves. Generally, such cells were rather well tuned for the direction of bar motion and preferred a direction substantially different from what they saw in optic flow movies. Optic flow movies shown in the forward direction were the most effective variety of movie for two-thirds of these cells. To see whether this outcome stemmed from differential direction tuning for bars and large multielement displays, in a second series of experiments we compared direction tuning for bars and large-field texture movies. Many cells showed substantially different direction tuning for the two kinds of stimulus: almost [Formula: see text] of 409 cells had tuning curves that overlapped each other by <50%. But only a small number of cells (<10%) responded much better to texture movies than to bars in the predominant direction of image motion in optic flow movies. This result, like that reported in the preceding paper, suggests that cells in LS respond differently to optic flow than to texture displays lacking optic flow motion cues.
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Dissertations / Theses on the topic "Tuning a marimba bars"

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Nop, Patrik. "Inovace barvy marimby pomocí nových kamenů, rezonátorů a přidáním virtuálních rejstříků." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400856.

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This diploma thesis focuses on suitable innovation of musical instrument marimba. The chosen problem has been verified by three optoins: new bars, new resonators, virtual registers. The work provides an analysis of the whole issue with verification of some samples and their inclusion or exclusion for further use in the research.
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Bo-Chuen, Zhuang, and 莊博淳. "Application of Finite Element Analysis on theXylophone/Marimba Tuning Process." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41315668891665803589.

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碩士
國立宜蘭大學
森林暨自然資源學系碩士班
100
Finite element analysis (FEA) can be used on xylophone key tuning simulation. In order to have an accurate tuning simulation, the crucial area of each modal frequency, the mass loss of each drilling location, and the various modal frequency changes of the keys should be verified. This research selected Pterocarpus soyauxii as the test materials, because it’s the common materials for making a wooden xylophone, and Pseudotsuga menziesii, and Tsuga heterophylla were chose for comparison. The effects of different drilling locations were discussed, and how the mass loss could affect a modal frequency was analyzed. The test materials were categorized into low, medium, and high ranges, as well as long, medium, and short three lengths. The drilling depth could be 5%- 45% of the test material length. Each test material was given nine drilling locations, but only one would be chosen. The 5 ㎜, 7 ㎜, and 9 ㎜ drills were used to create two drilling depths. There are a total of four degrees of mass losses, and the frequency changes before and after the drilling were recorded. The experiments revealed that all the test materials had similar results regardless of tree species or material length. The most significant areas that would affect the first, second, and third modal frequencies were located at the 40-45%, 25-35%, and 15-25% of the material length, respectively. This information is very useful for FEA tuning simulation, and the practical xylophone tuning. The frequency change analysis showed that there was no significant difference between Pterocarpus soyauxii and Tsuga heterophylla, but there was a significant difference between Pseudotsuga menziesii and the other two materials. Before utilizing FEA on tuning simulation, it is necessary to confirm the applicability of the model parameters. Pterocarpus soyauxii was selected as the material, and there were three ranges and three lengths. The frequency ratio was set at 1：4：10, and this ratio represented the frequency goal for the low IV range. The ratio for the medium range was set at 1：4. Regarding the high range, the fundamental frequency was emphasized. Modal analysis was conducted for each columnar material, and the finite element model modification was based on the modal frequency data. The error range was set at ±10%. Only when the parameters were modified and within the error range, it could be a valid model. After the valid model was established, there was an appropriate drilling depth in the crucial area of each modal frequency. The xylophone keys were adjusted until the target frequency ratio was achieved. Then, a coarse adjustment was taken in order to make all the modal frequency errors to be within the range of ±10%. After analyzing the different drilling locations and mass losses, this research proposed a practical tuning approach. A fine adjustment was conducted after the coarse adjustment so that the feasibility of the tuning method could be verified. The tolerance error was set at ±5 cents. The fine-tuning process and the frequency changes were recorded. The results revealed that all the error values of modal frequencies were within the permissible range. By using the same method, a 60-key xylophone with its own appearance could be made. The tuning method proposed by this research can served as a reference for the xylophone industry and anyone who is interested in xylophone tuning.
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Yeh, Hsiao Yun, and 葉小雲. "Effects of Moisture Content, Annual Ring Angle and Coating on the Vibrational Characteristics of Marimba Bars." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/20786946287159185393.

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碩士
國立宜蘭大學
自然資源學系碩士班
96
The first purpose of this study was to investigate the influence of parabolic undercuts on the natural frequency, internal friction, and ratios between natural frequencies of padauk (Pterocarpus spp.), selangan batu (Shorea spp.), belian (Eusideroxylon zwageri), Taiwan zelkova (zelkova formosana), and Taiwan acacia(Acacia confusa) wooden bars. Results showed that first three natural frequencies obtained from flexural vibration test decreased with an increase in undercut ratio, and those of internal friction corresponding to each vibration mode would increase. Removing material from any point on a bar affected all the natural frequencies to some extent. However from this study it is clear that removal from certain places affects some modes more than the others, and thus it is possible to tune the frequencies of a wooden bar in harmonic. Based on the values of MOE and internal friction, selangan batu could be a possible option for marimba bar material. The second aim of this study was to investigate the effects of moisture content, annual ring angle, and coating on the vibrational characteristics of padauk, selangan batu, and belian wooden bars. The first and second mode frequencies of wooden bars decreased and those of internal friction increased with an increase of moisture content. However, the ratio between first two frequencies remained at 4, which was not affected by the variation of moisture content. If the change of moisture content of wooden bar over 2%, the first and second mode frequencies discrepancy with respect to C4-B4 notes will exceed ±10 cents. This will result an incorrect pitch of each marimba bar. The internal friction of wooden bars at 0 degree annual ring angle was the lowest. Values of internal friction increased with an increase in annual ring angle, and this situation is not suitable for musical instruments. The first and second bending mode frequencies of wooden bars corresponding to C4-B4 notes decreased with an increase in coating weight percentages, and those of internal friction would tend to increase. But the ratio of f2/f1 would not affect by coating process. The dimensional stability and moisture-sorption behavior would be improved using coating process , so the acoustical qualities of marimba bars will less affected by relative humidity. It is suggested using thin tung oil coating for marimba bars in respect of variations of natural frequency and internal friction, operational processes and cost of different coatings.
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QIU, YAPING, and 邱雅萍. "Auto-tuning SOS Algorithm for Solving Engineering Problems - A Case Study of Cutting Steel Bars." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/qsqeew.

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碩士
國立臺灣科技大學
營建工程系
105
In recent decades, information technology was wisely applied in various areas. Many complex engineering problems can be easily solved by metaheuristic algorithm. For example, the problem of steel bars cutting, which is aim to reduce the oddments or the cost under known material steel bars, can be analyzed by algorithm. Symbiotic Organisms Search is a new algorithm that developed by Min-Yuan Cheng, etc. from CIC lab. To improve this algorithm, Cheng optimize the weights of three phases using SOS itself, which is named Self-tuning SOS. However, due to complicated nested double-structure, the algorithm converges very slowly and takes a long time. Based on SOS, this study brings out Auto-tuning SOS ,focusing on weights of three phases. It applies Sliding-Window and Taguchi Method during the search to reserve the better weights group. 50 benchmark functions are introduced into this new model, the results shows the Auto-tuning SOS performances well and converge in the early phase. Therefore, function evaluation can be reduced to save computing time. This study takes steel bars cutting problem as case. Organism code consists of two parts, sequence and group. Next Fit rule is used to calculate the cost of cutting plan. Result shows that this model finds better optimum comparing with GA, PSO, DE, ABC, SOS. It also converges fast than Self-tuning SOS.
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Books on the topic "Tuning a marimba bars"

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Banta, Christopher C. Marimba Bar Fabrication & Tuning. Funhouse Pr, 1996.

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Block, Elizabeth K., David L. Block, K. C. Freeman, Ivânio Puerari, and R. Groess. Penetrating Bars through Masks of Cosmic Dust: The Hubble Tuning Fork strikes a New Note. Springer, 2013.

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(Editor), David L. Block, Ivânio Puerari (Editor), Kenneth C. Freeman (Editor), Robert Groess (Editor), and Elizabeth K. Block (Editor), eds. Penetrating Bars through Masks of Cosmic Dust: The Hubble Tuning Fork strikes a New Note (Astrophysics and Space Science Library). Springer, 2005.

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Book chapters on the topic "Tuning a marimba bars"

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Garrett, Steven L. "Modes of Bars." In Understanding Acoustics, 235–81. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_5.

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Abstract The perspectives and techniques developed in the previous chapters will now be applied to calculation of wave propagation in solids. Their application to longitudinal and shear waves will be both familiar and simple. Even more satisfying is the success of those same techniques in finding solutions for waves in a system that does not obey the wave equation and exhibit a phase speed that varies with frequency. Measurement of the frequencies of the normal modes of thin bars will be used to determine the bars’ elastic constants to high precision. The relationship between measured modal frequencies and the elastic moduli is particularly simple because the torsional, flexural, and longitudinal modes of bars can be selectively excited and detected. The technique of resonant ultrasound spectroscopy will allow the extraction of moduli from resonance frequencies even for samples with dimensions that are not as conducive as those of thin bars by a process that is significantly more computationally intensive. The flexural rigidity of wires under tension will be analyzed to determine the normal modes of a “stiff string,” and those effects will be discussed in relation to the tuning of pianos
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Conference papers on the topic "Tuning a marimba bars"

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Ina´cio, Octa´vio, Lui´s Henrique, and Jose´ Antunes. "Simulation of the Oscillation Regimes of Bowed Bars: A Nonlinear Modal Approach." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32415.

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It is still a challenge to properly simulate the complex stick-slip behavior of multi-degree-of-freedom systems. In the present paper we investigate the self-excited nonlinear responses of bowed bars, using a time-domain modal approach, coupled with an explicit model for the frictional forces, which is able to emulate stick-slip behavior. This computational approach can provide very detailed simulations and is well suited to deal with systems presenting a dispersive behavior. The effects of the bar supporting fixture are included in the model, as well as a velocity-dependent friction coefficient. We present the results of numerical simulations, for representative ranges of the bowing velocity and normal force. Computations have been performed for constant-section aluminum bars, as well as for real vibraphone bars, which display a central undercutting, intended to help tuning the first modes. Our results show limiting values for the normal force FN and bowing velocity y˙bow, for which the “musical” self-sustained solutions exist. Beyond this “playability space”, double period and even chaotic regimes were found for specific ranges of the input parameters FN and y˙bow. As also displayed by bowed strings, the vibration amplitudes of bowed bars also increase with the bow velocity. However, in contrast to string instruments, bowed bars “slip” during most of the motion cycle. Another important difference is that, in bowed bars, the self-excited motions are dominated by the system first mode. Our numerical results are qualitatively supported by preliminary experimental results.
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Murray, Andrew P., and Franc¸ois Pierrot. "Design of a High-Speed Spherical Four-Bar Mechanism for Use in a Motion Common in Assembly Processes." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35354.

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In this paper, we present the mechanical design of a spherical four-bar mechanism for performing a motion common in manufacturing and assembly processes. The mechanism is designed to create, in a single, smooth motion, the combined rotation of a body by 90 degrees about one axis with a 90 degree rotation about an axis perpendicular to the first. A spherical four-bar mechanism is pursued as the basis for the design because the reorientation is produced mechanically rather than via a control scheme typical when higher degree of freedom systems are utilized. The design initiates with the kinematic synthesis of the spherical mechanism to guide a body through two orientations. The next step in the design is to refine the spherical fourbar based on manufacturing and operational concerns. As one of the challenges of utilizing these four-bars is tuning the starting and ending angle for the mechanism’s motion, a sensitivity analysis is performed to gauge the needed accuracy. Finally, there are details and a discussion of the proposed mechanical design.
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