Relevant bibliographies by topics / Organ pipe

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Organ pipe'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Organ pipe"

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d’Alessandro, Christophe, and Markus Noisternig. "Of Pipes and Patches: Listening to augmented pipe organs." Organised Sound 24, no. 1 (April 2019): 41–53. http://dx.doi.org/10.1017/s1355771819000050.

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Pipe organs are complex timbral synthesisers in an early acousmatic setting, which have always accompanied the evolution of music and technology. The most recent development is digital augmentation: the organ sound is captured, transformed and then played back in real time. The present augmented organ project relies on three main aesthetic principles: microphony, fusion and instrumentality. Microphony means that sounds are captured inside the organ case, close to the pipes. Real-time audio effects are then applied to the internal sounds before they are played back over loudspeakers; the transformed sounds interact with the original sounds of the pipe organ. The fusion principle exploits the blending effect of the acoustic space surrounding the instrument; the room response transforms the sounds of many single-sound sources into a consistent and organ-typical soundscape at the listener’s position. The instrumentality principle restricts electroacoustic processing to organ sounds only, excluding non-organ sound sources or samples. This article proposes a taxonomy of musical effects. It discusses aesthetic questions concerning the perceptual fusion of acoustic and electronic sources. Both extended playing techniques and digital audio can create musical gestures that conjoin the heterogeneous sonic worlds of pipe organs and electronics. This results in a paradoxical listening experience of unity in the diversity: the music is at the same time electroacoustic and instrumental.
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Baretzky, B., M. Friesel, and B. Straumal. "Reconstruction of Historical Alloys for Pipe Organs Brings True Baroque Music Back to Life." MRS Bulletin 32, no. 3 (March 2007): 249–55. http://dx.doi.org/10.1557/mrs2007.30.

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AbstractThe pipe organ is the king of musical instruments. No other instrument can compare with the pipe organ in power, timbre, dynamic range, tonal complexity, and sheer majesty of sound. The art of organ building reached its peak in the Baroque Age (∼1600–1750); with the industrial revolution in the 19th century, organ building shifted from a traditional artisans' work to factory production, changing the aesthetic concept and design of the organ so that the profound knowledge of the organ masters passed down over generations was lost.This knowledge is being recreated via close collaborations between research scientists, musicians, and organ builders throughout Europe. Dozens of metallic samples taken from 17th- to 19th-century organ pipes have been investigated to determine their composition, microstructure, properties, and manufacturing processes using sophisticated methods of materials science. Based upon these data, technologies for casting, forming, hammering, rolling, filing, and annealing selected leadtin pipe alloys and brass components for reed pipes have been reinvented and customized to reproduce those from characteristic time periods and specific European regions. The new materials recreated in this way are currently being processed and used by organ builders for the restoration of period organs and the manufacture of new organs with true Baroque sound.
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Gungl, Ernest, and Zmago Brezočnik. "Controller of Register Combinations and Tone Keys for Pipe Organ." International Journal of Innovative Science and Research Technology 5, no. 7 (August 23, 2020): 1432–38. http://dx.doi.org/10.38124/ijisrt20jul860.

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A pipe organ is a musical instrument that produces sound by driving pressurized air through the organ pipes selected from a keyboard called a manual. It is constructed from settled groups of pipes. Each group is composed of similar pipes with the same tone colour and loudness but different pitch. Such a group is called a rank. We have developed two electronic devices for upgrading the organ. The first device named Controller of Register Combinations is intended for storing rank combinations and pipe organ controlling. The second device named Controller of Tone Keys for pipe organ allows users to play the organ simultaneously on two separate keyboards. In this paper, we represent the purpose, scheme, and our realization of both devices. The correct functioning of the devices was proved by integrating them into a church organ. We have already equipped several church organs with our electronics, and they all work flawlessly. Feedback from the organists is excellent, as both Controller of Register Combination and Controller of Tone Keys make it easier for them to play. The success so far and the positive responses of the organists have encouraged us already to plan further improvements and upgrades of the organ electronics.
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Odya, Piotr, Józef Kotus, Maciej Szczodrak, and Bożena Kostek. "Sound Intensity Distribution Around Organ Pipe." Archives of Acoustics 42, no. 1 (March 1, 2017): 13–22. http://dx.doi.org/10.1515/aoa-2017-0002.

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Abstract The aim of the paper was to compare acoustic field around the open and stopped organ pipes. The wooden organ pipe was located in the anechoic chamber and activated with a constant air flow, produced by an external air-compressor. Thus, a long-term steady state response was possible to obtain. Multi-channel acoustic vector sensor was used to measure the sound intensity distribution of radiated acoustic energy. Measurements have been carried out on a defined fixed grid of points. A specialized Cartesian robot allowed for a precise positioning of the acoustic probe. The resulted data were processed in order to obtain and visualize the sound intensity distribution around the pipe, taking into account the type of the organ pipe, frequency of the generated sound, the sound pressure level and the direction of acoustic energy propagation. For the open pipe, an additional sound source was identified at the top of the pipe. In this case, the streamlines in front of the pipe are propagated horizontally and in a greater distance than in a case of the stopped pipe, moreover they are directed downwards. For the stopped pipe, the streamlines of the acoustic flow were directed upwards. The results for both pipe types were compared and discussed in the paper.
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WAGNER, RUSSELL. "The Organ Pipe Cactus." Cactus and Succulent Journal 79, no. 1 (January 2007): 35. http://dx.doi.org/10.2985/0007-9367(2007)79[35b:topc]2.0.co;2.

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Steenbrugge, Dirk, and Patrick De Baets. "Aerodynamics of flue organ pipe voicing." International Journal Sustainable Construction & Design 1, no. 1 (November 6, 2010): 162–73. http://dx.doi.org/10.21825/scad.v1i1.20421.

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The objective of this paper is to investigate the possibility of giving useful interpretations of flueorgan pipe voicing practices in terms of the aerodynamical and aeroacoustical behaviour of the pipes. Anoverview is first given of the current state of the knowledge on sound generation in flue instruments. Afteran introduction into the limited literature on voicing an scheme is presented as a possible framework toclassify and characterize various voicing approaches. Use is made of dimensionless analysis to quantifythe specific properties of voicing methods in terms of aerodynamic parameters rather than geometric data.It is concluded that such an analysis might be a useful tool to be able to better document and understandhistoric instruments and their genesis in order to better conserve them.
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Baldini, Francesco, Riccardo Falciai, Andrea Azelio Mencaglia, Folco Senesi, Dario Camuffo, Antonio della Valle, and Carl Johan Bergsten. "Miniaturised Optical Fibre Sensor for Dew Detection Inside Organ Pipes." Journal of Sensors 2008 (2008): 1–5. http://dx.doi.org/10.1155/2008/321065.

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A new optical sensor for the continuous monitoring of the dew formation inside organ pipes was designed. This aspect is particularly critical for the conservation of organs in unheated churches since the dew formation or the condensation on the pipe surfaces can contribute to many kinds of physical and chemical disruptive mechanisms. The working principle is based on the change in the reflectivity which is observed on the surface of the fibre tip, when a water layer is formed on its distal end. Intensity changes of the order of 35% were measured, following the formation of the water layer on the distal end of a 400/430 μm optical fibre. Long-term tests carried out placing the fibre tip inside the base of an in-house-made metallic foot of an organ pipe located in an external environment revealed the consistency of the proposed system.
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Holmes, Brian. "The helium‐filled organ pipe." Physics Teacher 27, no. 3 (March 1989): 218–19. http://dx.doi.org/10.1119/1.2342725.

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Angster, Judit, Zlatko Dubovski, and Andras Miklos. "Zinc for organ pipe building." Journal of the Acoustical Society of America 129, no. 4 (April 2011): 2519. http://dx.doi.org/10.1121/1.3588334.

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Kraybill, Jan. "Acoustics of the pipe organ." Journal of the Acoustical Society of America 132, no. 3 (September 2012): 1902. http://dx.doi.org/10.1121/1.4754978.

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Dissertations / Theses on the topic "Organ pipe"

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Siegfried, Abbey Hallberg. "Contemporary American organ music : defining the compositional potential of the pipe organ in conversations with composers /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/11366.

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Cagle, Caroline Woodell. "Technology in Society: The Pipe Organ in Early Modern England." Diss., Virginia Tech, 2002. http://scholar.lib.vt.edu/theses/available/etd-04172003-005110.

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Disley, Alastair Christian. "An exploration of timbral semantics related to the pipe organ." Thesis, University of York, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415171.

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Smith, Charles Walter 1951. "Wilderness management and use in and for Organ Pipe Cactus National Monument." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/291906.

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This study examines the wilderness use in Organ Pipe Cactus National Monument. A tabulation of the Backcountry Use Permits reveals the usage of different parts of the monument wilderness. Along with a discussion of the National Park Service Visitor Survey, the tabulation explains the visitor usage in terms of desirable and undesirable recreational features. A review of other Federal Agencies' Wilderness Management Plans and Proposals provides an overview of problems, deficiencies, and operational management strategies of Wilderness Management. Finally, a series of recommendations are offered to assist Organ Pipe Cactus National Monument in the development of a workable Wilderness Management Plan and to help the visitor understand the effects of the recreational visit on the fragile desert environment.
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Corron, Ashley. "Energy generation with greywater reuse systems| The case of organ pipe cactus national monument." Thesis, The University of Arizona, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10252103.

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At the rate the population is growing it is important to find ways to be more efficient with the energy and water we use. The increase in population increases the need for electricity and water, but the way we are using our sources will not leave us with enough for future generations. The constant use of “dirty energy”, energy that emits CO2 and other chemicals into the atmosphere, will continue to harm our environment. A new system is needed to help preserve water and produce green energy that will not harm the only earth we have.

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Corron, Ashley, and Ashley Corron. "Energy Generation with Greywater Reuse Systems: The Case of Organ Pipe Cactus National Monument." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/622898.

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At the rate the population is growing it is important to find ways to be more efficient with the energy and water we use. The increase in population increases the need for electricity and water, but the way we are using our sources will not leave us with enough for future generations. The constant use of "dirty energy", energy that emits CO2 and other chemicals into the atmosphere, will continue to harm our environment. A new system is needed to help preserve water and produce green energy that will not harm the only earth we have.
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Woolley, Alan G. "The physical characteristics of mechanical pipe organ actions and how they affect musical performance." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/25337.

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Many organists believe that one of the main advantages of mechanical actions, i.e. those in which there is a direct and uninterrupted mechanical link from the key which the player moves to the pallet valve that admits air to the pipes, is that they allow the player to control the pallet and thus influence the initial sound of the pipe. This project looks at how the key and pallet actually move compared with what the player believes is happening. Measurements of the movement of the keys and, where possible, the pallets were made using LED and laser distance sensors, with the organists being asked to play in a variety of styles that they believed resulted in the keys moving at significantly different speeds. Sound recordings were made in order to compare the transients. The results showed that the key movement could be broken down into two distinct parts. The first part is the movement before pluck and thus before the pallet starts opening in which the flexibility of the action was taken up. The relative length of this movement varied very considerably even on short and rigid actions showing elongations when players believed that they were moving the key slowly. The movement after pluck, and thus during which the pallet was opening and admitting air to the pipes, did not vary greatly and in some cases, despite the player very deliberately trying to vary the speed, remained nearly constant. It could be clearly shown that attempts to vary the speed of key movement were, in fact, resulting in distinct rhythmic changes. The conclusion is that although players vary the time of the complete key movement, any difference occurs mostly in the part of the key movement before the pallet starts opening and thus cannot have any influence on the initial transient.
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Bowen, Thomas. "Hunting the Elusive Organ Pipe Cactus on San Esteban Island in the Gulf of California." University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/555908.

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McVicker, William Richard. "An analytical approach to open, cylindrical organ-pipe scaling from a historical perspective with specific reference to the scaling practices of selected organ-builders." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/1551/.

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Taylor, Alan. "The effects of centrifugal blowers, control valves, attenuating devices and reservoir resonance on organ pipe flutter." Thesis, University of Salford, 2019. http://usir.salford.ac.uk/49776/.

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The aim of this research is to investigate the noticeable organ pipe flutter that may, under certain conditions, exist on a sounding organ pipe. The effectiveness of a pipe organ wind system is notoriously difficult to predict. For many years pipe organ builders have been aware of organ pipe flutter and several have tried to address the problem with little success. For pureness of tone it is important that the wind system is perfectly steady and without any imperfections that may cause organ pipe flutter. A survey of 83 UK pipe organs, was conducted by 8 organ tuners, confirms that 57% of the pipe organs surveyed had organ pipe flutter. Organ pipe flutter is particularly noticeable when tuning pipework or playing single notes. During this condition there is "no flow" in the duct connecting the blower to the reservoir. Using a specially constructed test apparatus, built from pipe organ components, this research examines the conditions necessary to produce organ pipe flutter, and how organ pipe flutter may be eliminated. Employing a microphone to measure a sounding test organ pipe and an accelerometer to measure the vibration of a reservoir top, various pipe organ wind system elements are examined and correlated with the excitation and attenuation of the reservoir top vibration and organ pipe flutter. The reservoir acts as a mass spring system. For weighted wind systems the mechanical mass, which may exceed 100kgs, is the dominant factor. For sprung reservoir wind systems, the mass is approximately 25% of that for a weighted system and is less dominant. Results indicate that under certain conditions, the blower excites the reservoir at its natural resonant frequency with sufficient amplitude to cause unwanted amplitude modulation on a sounding organ pipe. Results are systematically presented for weighted and sprung reservoir wind systems, organ blowers and the effects of blade frequencies, reservoir control valves, and attenuating devices inserted between the blower and the reservoir, to determine their effect on reservoir top vibration and the development of organ pipe flutter. With this knowledge, the pipe organ builder will be able to build pipe organs with improved wind systems and flutter free pipework.
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Books on the topic "Organ pipe"

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Orcutt, Jane. The pipe organ. Carmel, N.Y: Guideposts, 2005.

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Orcutt, Jane. The Pipe Organ. Carmel, N.Y: Guideposts, 2005.

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Ashford, Emma Louise. Ashford's organ voluntaries for pipe and reed organ. Dayton, Ohio: Lorenz & Co., 1988.

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Bizjak, Milko. Pipe organs in Slovenia. Ljubljana: Državna založba Slovenije, 1985.

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Schnurr, Stephen J. Pipe organs of Chicago. Oak Park, Ill: Chauncey Park Press, 2005.

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Schnurr, Stephen J. Pipe organs of Chicago. Oak Park, Ill: Chauncey Park Press, 2005.

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Wickens, David C. Aspects of English organ pipe scaling. Oxford: Positif Press, 2004.

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Dalton, Christopher. Pipe organs of British Columbia. [Victoria, B.C: L.B. Word Works], 2010.

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Kingsley, Kenneth J. Invertebrates of Organ Pipe Cactus National Monument, Arizona. Tucson, Ariz: U.S. Geological Survey, Cooperative Park Studies Unit, School of Renewable Natural Resources, 1998.

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Universitatea de Vest din Timișoara, ed. Orgile din România =: Pipe organs of Romania. Timișoara: Editura Universitǎţii de Vest, 2008.

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Book chapters on the topic "Organ pipe"

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Mahu, W. E. A., M. C. A. M. Peters, M. P. Verge, A. P. J. Wijnands, B. Fabre, and A. Hirschberg. "Attack transient of a flue organ pipe." In Topics in Applied Mechanics, 163–71. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2090-6_17.

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Bucur, Voichita. "Marble, The Nondegradable Material for Pipe Organ." In Handbook of Materials for Wind Musical Instruments, 787–800. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19175-7_21.

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Machlin, Paul S. "Born Again: The Pipe Organ as Jazz Instrument." In Stride: The Music of Fats Waller, 41–77. London: Palgrave Macmillan UK, 1985. http://dx.doi.org/10.1007/978-1-349-08567-5_3.

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Kostek, Bozena. "Intelligent Control System Implementation to the Pipe Organ Instrument." In Rough Sets, Fuzzy Sets and Knowledge Discovery, 450–57. London: Springer London, 1994. http://dx.doi.org/10.1007/978-1-4471-3238-7_53.

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Abel, M., and K. Ahnert. "Spectral reconstruction of sound radiated by an organ pipe." In Springer Proceedings in Physics, 863–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03085-7_207.

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Fischer, Jost Leonhardt. "Shock Wave Characteristics in the Initial Transient of an Organ Pipe." In Current Research in Systematic Musicology, 269–304. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-02695-0_13.

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Fletcher, Neville H., and Thomas D. Rossing. "Pipe Organs." In The Physics of Musical Instruments, 552–80. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-0-387-21603-4_17.

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Bennett, William Ralph. "Pipe Organs." In The Science of Musical Sound, 299–327. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92796-1_7.

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Fletcher, Neville H., and Thomas D. Rossing. "Pipe Organs." In The Physics of Musical Instruments, 467–93. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4612-2980-3_17.

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Fischer, Jost Leonhardt. "Feedback of Different Room Geometries on the Sound Generation and Sound Radiation of an Organ Pipe." In Current Research in Systematic Musicology, 109–42. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47292-8_4.

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Conference papers on the topic "Organ pipe"

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Zhu, B., B. Tiller, J. F. C. Windmill, A. J. Mulholland, and A. J. Walker. "“Pipe organ” air-coupled broad bandwidth transducer." In 2017 IEEE International Ultrasonics Symposium (IUS). IEEE, 2017. http://dx.doi.org/10.1109/ultsym.2017.8091888.

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Zhu, Botong, Benjamin Tiller, Alan Walker, Anthony Mulholland, and James Windmill. "“Pipe organ” Air-coupled broad bandwidth transducer." In 2017 IEEE International Ultrasonics Symposium (IUS). IEEE, 2017. http://dx.doi.org/10.1109/ultsym.2017.8091925.

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Kotus, J., P. Odya, and B. Kostek. "Measurements and visualization of sound field distribution around organ pipe." In 2015 Signal Processing: Algorithms, Architectures, Arrangements, and Applications (SPA). IEEE, 2015. http://dx.doi.org/10.1109/spa.2015.7365150.

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CHALFOUN, NADER. "ACHIEVING NET-ZERO STATUS WHILE EMPHASIZING THE HERITAGE ARCHITECTURE LANDMARK OF THE ORGAN PIPE CACTUS NATIONAL MONUMENT IN ARIZONA, USA." In STREMAH 2017. Southampton UK: WIT Press, 2017. http://dx.doi.org/10.2495/str170031.

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CHALFOUN, NADER. "A SOLAR FARM PROTOTYPE DESIGN THAT ACHIEVES NET-ZERO STATUS AND ECONOMIC DEVELOPMENT AT THE ORGAN PIPE CACTUS NATIONAL MONUMENT IN ARIZONA, USA." In ENVIRONMENTAL IMPACT 2018. Southampton UK: WIT Press, 2018. http://dx.doi.org/10.2495/eid180361.

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Gosweiller, Christoph, Bryan Willson, and Thomas Walter. "Application of an Improved Model for the Determination of Acoustic Resonances in Indicator Passages for Combustion Pressure Measurements." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1373.

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The acoustic resonances in indicator passages are often modeled using either a Helmholtz or a so called organ pipe acoustical model. However, in practice these models often indicate natural frequencies which are too high. This paper proposes the Bergh and Tijdeman model [1] which is more accurate and which was originally developed for pressure measurements in turbomachinery. This paper presents the theoretical basis for the Berg / Tijdeman model and then uses it to explore signal distortion from a variety of indicator passage geometries. In order to validate the approach, a flush-mounted water-cooled Kistler reference transducer was used to measure accurate in-cylinder combustion data in an automotive Diesel engine. An additional sensor was recess mounted with passages of different geometries. The Bergh Tijdeman model was then applied to investigate the acoustic distortion of the indicator passages. The results show excellent agreement with the experimental data, which are much closer than using the Helmholtz or the organ pipe model. Further the Bergh and Tijdeman model is applied to complex indicator passage geometries with multiple cavities. Again, for comparison, a flush-mounted Kistler reference transducer was used to measure accurate in-cylinder combustion data in a large-bore natural gas engine. Three additional sensors were mounted using different indicator passage geometries. The engine was operated under base line and knocking combustion conditions. The Bergh Tijdeman model was then applied to model the acoustic distortion of the three indicator passages and again showed good agreement with the experimental data. Finally, the paper proposes simple rules for implementing indicator passages in large gas engines.
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Mélot, Mickaël, and Julien Berthon. "On-Line Phased-Array Ultrasonic System: OPUS to Control Pressure Sheath of Flexible Pipe During Manufacturing." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54473.

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Flexible pipes are made up of several different layers specifically designed to meet the requirements of our clients and API17J / ISO13628-2. In the pursuit of ever more efficient and reliable solutions, even in the world’s harshest and deepest offshore environments, TECHNIP’s R&D activity is focused on extending its product range by introducing new products and materials. As part of this innovation program, new polymers are constantly being investigated to assess their potential as a pressure sheath. The pressure sheath is the most critical thermoplastic sheath within the structure. Its role is to contain internal fluid and transfer internal pressure to the pressure vault layer outside it. To fulfill that mission, this polymer must be leakproof and perform over wide temperature and pressure range. In operation condition, the presence of small flaws within the pressure sheath could propagate leading to failure and significant environmental and operational damages. Therefore, the manufacturing of such a polymer layer must conform with ever-higher levels of reliability and quality. This is the reason why a visual inspection of pressure sheath according to API17J / ISO13628-2 standards is mandatory. As a leitmotiv, TECHNIP dedicates a lot of effort, not only to extend the limits of the possible by introducing new materials, but also to take inspection further beyond standard requirements by developing dedicated on-line NDT control systems able to ensure layer high quality. Many people are familiar with the medical applications of ultrasonic imaging in which ultrasonic waves are used to create highly detailed cross-sectional pictures of internal organ. Medical echography is commonly performed with specialized multielement probe known as phased-array and their accompanying hardware and software. The applications of ultrasonic phased-array technology are not limited to medical diagnosis and in recent years, increasing use of these systems can be observed in industrial environment. Nevertheless, although phased-array systems on the market can provide new levels of information and visualization, they are manually and locally operated and are inappropriate to control polymer sheath over several kilometers during manufacturing. This paper presents a specific and automated ultrasonic system dedicated to manufacturing control of thermoplastics such as the pressure sheath. Developed by TECHNIP, and based on cutting edge ultrasonic technology used in aerospace and medicine, OPUS is a world-class NDT system able to prove that our pressure sheaths meet design criteria and achieve the highest quality level.
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Meyer, Gregory A., Timothy K. Meneely, Jeremy R. Koether, Stephen D. Smith, and David C. DiBasilio. "Vibration of a High Energy PWR Piping System due to Vibro-Acoustic Coupling: Evaluation and Mitigation." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93594.

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Abstract Vortex Shedding at pipe junctions can create pressure pulsations and flow-induced vibrations. The flow through one pipe may result in a shear layer at the junction with a second pipe. Instabilities such as vortex shedding in the shear layer can then excite acoustic modes in the second pipe, especially when the flow in the secondary pipe is stagnant or weak. The effect is the excitation of a pipe organ mode, which under certain conditions, may result in unacceptable noise and/or vibration levels. Within the nuclear industry this phenomenon has been most frequently observed in boiling water reactors (BWRs), resulting in vortex-induced, main steam line associated stand pipe acoustic resonances. This phenomenon has not been typically observed in pressurized water reactors (PWRs), especially in primary coolant loops due to the lengths of pipe needed to support acoustic resonances in water systems relevant to driving lower order structural piping modes. However, if certain conditions exist, PWRs do contain large sections of piping which can be susceptible to such flow-induced adverse noise and vibration effects. This paper describes the evaluation and mitigation of structural vibrations due to a vortex-induced excitation of an acoustic mode of a large side branch pipe in a high-energy, water-filled, PWR piping system. Specifically, an acoustic resonance was observed and structurally significant resultant vibration levels were measured on a safety related piping system directly connected to a PWR primary reactor coolant system (RCS) between the reactor and a steam generator. A rapidly employed evaluation program was implemented, which included significant in-situ structural vibration measurements that informed a combination of acoustic, structural, and fluid-domain numerical modeling evaluations. These evaluations were performed in concert to provide both root cause insights and candidate mitigation strategies. Candidate mitigation strategies were then evaluated prior to inplant implementation via further modeling evaluations and a model-scale testing program. This paper describes the primary vibration characteristics of interest of the affected piping system, the data analyses and modeling methods used to successfully identify the vibro-acoustic phenomena, the developed mitigation strategies, and verification of the final mitigation strategy via model-scale with final demonstration occurring in the plant prior to fuel load.
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9

Hammer, Steffen, Jens Fridh, and Mattias Billson. "Experimental Investigation of Rossiter Modes for an Open Box Cavity With Adjustable Depth." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-60037.

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Abstract Resonance in aerospace is a phenomenon that engineers have been trying to predict and avoid for a long time. Acoustic resonance is only a part in this field. When it was previously studied, it was mostly in connection with long slender gaps at the fuselage of aircrafts. Lately it has become a focus in the development of highly efficient aero engines. Bleed systems in the compressor part of engines are needed but not easy to place aerodynamically. Additionally, these bleed systems have complex geometries. These geometries coupled with the operational range of modern aircraft from low to high subsonic Mach numbers can create unwanted acoustic resonances. This paper is part of project study of these resonances. Here the bleed geometry is simplified to an open box cavity that is studied experimentally in order to measure its acoustic behavior in low to high subsonic flow. The experimental data is compared to theoretical prediction models to create a baseline for future studies. The results show a good agreement between Rossiter prediction and experiments for a shallow cavity of L/D = 4. Deeper cavities with a length to depth ratio of one and 0.5 represent more organ pipe resonance phenomena. This is especially governed by the geometry of the cavity itself and the height of the test section. All cavities experience a shift in modes depending on the operating point. This mode shift pattern is similar for deeper cavities. However, the operating range can be divided into four sections in which a mode shift occurs for all cavities.
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10

Zipser, Lothar, and Heinz Franke. "Vibrations of thin-walled tubes and organ flue pipes." In Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, edited by Enrico P. Tomasini. SPIE, 1996. http://dx.doi.org/10.1117/12.248647.

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Reports on the topic "Organ pipe"

1

Hydrogeology of the Quitobaquito Springs and La Abra Plain area, Organ Pipe Cactus National Monument, Arizona, and Sonora, Mexico. US Geological Survey, 1996. http://dx.doi.org/10.3133/wri954295.

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