Dissertations / Theses on the topic 'Pressure wave'
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Cox, Simon John. "Pressure impulses caused by wave impact." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266731.
Full textWu, Cheng Y. (Cheng Yi) 1938. "Wave-wave interactions and the infrasonic pressure field in the ocean." Thesis, University of Auckland, 1988. http://hdl.handle.net/2292/2469.
Full textWood, Deborah Jane. "Pressure-impulse impact problems and plunging wave jet impact." Thesis, University of Bristol, 1997. http://hdl.handle.net/1983/c3dbd4c5-5082-4c71-a16e-3daa969e22ee.
Full textSorvoja, H. (Hannu). "Noninvasive blood pressure pulse detection and blood pressure determination." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514282728.
Full textSabkha, Aimen. "Implantable Wireless Surface Acoustic Wave Sensors for Blood Pressure Measurement." Thesis, Oxford Brookes University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491086.
Full textBrasek, Thomas Peyton. "Response of dual-layered structures subjected to shock pressure wave." Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/30529.
Full textEriksson, Lars. "Design and dimensioning of pressure vessel for a marine substation." Thesis, Uppsala University, Electricity, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-114426.
Full textThis thesis presents the mechanical design and dimensioning of a pressure vessel, which is to be used as housing for a marine substation in a wave power park. A concept for generation of electricity from ocean waves is being developed at the Division of electricity at Uppsala University. The concept is based on the use of a permanent magnet linear generator, placed on the seabed, connected via a line to a buoy at the surface. The generated electricity from a group of generators is transmitted in sea cables to a marine substation where conversion and transformation takes place before the electricity is transmitted to shore. To reduce the risk of water leakage, the gas pressure inside the marine substation is larger than the surrounding water pressure. The substation can be pressurized before submersion, which requires the housing to be designed as a pressure vessel. The pressure vessel has been dimensioned with formula based methods according to EN 13445, the European standard for unfired pressure vessels. The construction has been based on modifying a standard pressure tank. The housing has been designed for installation and sealing of a large number of electrical connectors. The connectors have been placed in a way that allows for future cable coupling with remotely operated vehicles and simplifies maintenance of the substation. Another design consideration has been to facilitate submersion by reducing the buoyancy of the substation.
Feng, Jiling. "Wave propagation in flexible tubes." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5367.
Full textMaterano, Blanco Gilberto Ignacio. "Numerical modelling of pressure rise combustion for reducing emissions of future civil aircraft." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9259.
Full textRoy, Matthew S. "Acute effects of facial cooling on arterial stiffness and wave reflection." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 56 p, 2007. http://proquest.umi.com/pqdweb?did=1397914231&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textAntonangeli, Daniele. "Elasticity and sound wave anisotropy of hcp-metals at high-pressure." Paris 6, 2005. http://www.theses.fr/2005PA066001.
Full textBassili, Niclas, and Douglas Eriksson. "An evaluation of deterministic prediction of ocean waves using pressure data to assist a Wave Energy Converter." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279600.
Full textNuvarande enheter för att extrahera elektrisk energi från havsvågor lider av stora problem med låg effektivitet på grund av brist på information om de inkommande vågorna. Det komplexa ickelinjära dynamiska beteendet hos havsvågor gör förutsägelsen av dem till en stor utmaning. Det här arbetet syftar till att undersöka ett deterministiskt kortsiktigt system för att förutspå våg för våg, som noggrant kan förutspå våghöjd och tidpunkt för de inkommande vågorna, baserat på mätdata från en dränkbar trycksensor. Den kompletta förutsägelseprocessen innehåller tre steg, rekonstruktion, assimilering och förutsägelse. En ickelinjär weakly dispersive reconstruction method används först för att med hög noggrannhet beräkna ythöjningen från det uppmätta trycket. Därefter, används en variational assimilation method för att konvertera en tidsserie av ythöjningen till ett rumsligt vågfält, för att erhålla initialvillkor för förutsägelsen. Slutligen används en High Order Spectral Method för att deterministiskt förutspå utvecklingen av det tvådimensionella oregelbundna vågfältet baserat på de förvärvade initialvillkoren. För att verifiera prestandan av det föreslagna förutsägelsesystemet, så genomfördes tester med data från olika oregelbundna havstillstånd med varierande parametrar, genererade av simuleringar, såväl som modellexperiment utförda i en kontrollerad miljö i form av en vågtank. Resultaten från testerna visar att ythöjningen förutspås inom 5% från referensen, för en period på 10 sekunder framåt i tiden, för vågor som ett vågkraftverk vanligtvis utsätts för. Baserat på resultatet, så är det möjligt att förutspå inkommande vågor, men noggrannheten beror kraftigt på det aktuella havstillståndet och det valda avståndet för förutsägelsen. Resultaten har jämförts mot liknande tester gjorda med radardata och visat sig vara ett genomförbart alternativ för vissa havstillstånd. Sammanfattningsvis visas det att tryckmätningar, som ett medel för att mäta ett havsvågfält, är ett bra alternativ när de kombineras med ickelinjära rekonstruktions- och förutsägelsemetoder för att hjälpa till att öka ett vågkraftverks energigenerering.
Hope, Sarah A. "Arterial pressure waves : waveform characteristics, their associations and factors influencing their propagation." Monash University, Faculty of Medicine, Nursing and Health Sciences, 2003. http://arrow.monash.edu.au/hdl/1959.1/5566.
Full textBell, James Andrew, and andrew bell@anu edu au. "The Underwater Piano: A Resonance Theory of Cochlear Mechanics." The Australian National University. Research School of Biological Sciences, 2006. http://thesis.anu.edu.au./public/adt-ANU20080706.141018.
Full textGreen, Anna Catriona. "When light gets pushy : radiation pressure effects in interferometric gravitational wave detectors." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8512/.
Full textCharonko, John James. "A Nondimensional Scaling Parameter for Predicting Pressure Wave Reflection in Stented Arteries." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/31906.
Full textMaster of Science
Schilling, Jennifer K. "High Pressure Hydrodynamic Shock Wave Effects on Tenderness of Early Deboned Broiler Breasts." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31010.
Full textMaster of Science
Ronningen, Theodore J. "Low temperature helium pressure broadening of HCN." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1118153531.
Full textTitle from first page of PDF file. Document formatted into pages; contains xiv, 218 p.; also includes graphics (some col.) Includes bibliographical references (p. 208-218). Available online via OhioLINK's ETD Center
Anderås, Emil. "Advanced MEMS Pressure Sensors Operating in Fluids." Doctoral thesis, Uppsala universitet, Fasta tillståndets elektronik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-173182.
Full textÖgün, Celal Mohan [Verfasser]. "Surface wave driven molecular low pressure plasmas for general lighting / Celal Mohan Ögün." Karlsruhe : KIT Scientific Publishing, 2016. http://www.ksp.kit.edu.
Full textWolters, G. "Characteristics of wave impact induced pressure pulse propagation into cracks of coastal structures." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419521.
Full textPatel, Darshan Shyam. "A Real-Time Technique for the Correction of Invasive Blood Pressure Measurements using Counter Pressure." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1205764260.
Full textBoneau, Trent Christopher. "A wavenumber investigation of the correlation between surface and far field acoustic pressure." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19436.
Full textGillespie, Donald G. (Donald Gardner). "Evaluating shear wave velocity and pore pressure data from the seismic cone penetration test." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30573.
Full textApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Harvey, Craig W. "Shear wave velocities of sulphide-bearing assemblages as determined from high-pressure laboratory measurements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq24851.pdf.
Full textTasneem, Nazia. "Study of wave shaping techniques of split Hopkinson pressure bar using finite element analysis." Thesis, Wichita State University, 2005. http://hdl.handle.net/10057/2341.
Full textThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering.
Includes bibliographic references (leaves 78-81).
Sasoh, A., T. Ohtani, and K. Mori. "Pressure Effect in a Shock-Wave–Plasma Interaction Induced by a Focused Laser Pulse." American Physical Society, 2006. http://hdl.handle.net/2237/8852.
Full textHirose, Eiichi. "A study of angular instability due to radiation pressure in LIGO gravitational wave detector." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Full textChen, Chih-yang, and 陳志洋. "Wave Pressure Formula of Deepwater Breakwaters with Wave Overtopping." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/36676617062968772581.
Full text國立成功大學
水利及海洋工程學系碩博士班
96
This study proposed a modified Goda’s wave pressure formula to investigate the characters of pressure in deepwater breakwater with wave overtopping by using Shiu’s (2003) irregular wave pressure experimental data in deeper relative depth. Then, according to experimental results, the comparison and discussion between present modified formula and Goda’s formula on wave pressure statistics, total wave pressure force and accuracy. From the overtopping wave pressure profile, the result shows that the wave pressure in 1/7 water depth without evidence shrink. At the aspect of wave pressure statistics and wave pressure force, present modified formula are more conformable with experiment than Goda’s formula, and Goda’s formula will overestimate the actual wave pressure force when overtopping. Present formula, Goda’s formula and Haung&Lee’s (1996) formula are more accurate than Sainflou’s (1928) formula and Yeh’s (2001) formula when calculation with the sliding factor. Come to the conclusion, present modified wave pressure formula can be suitable for calculation wave pressure in deepwater breakwaters with wave overtopping.
Hsu, Yu-Hsiung, and 許裕雄. "Wave Pressure on Breakwater by Irregular Wave with Water Overtopping." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/43992632367639030660.
Full text國立中興大學
土木工程學系
88
Estimating the quantity of wave overtopping is an essential part to seawall design. Most previous studies were only paid attention to the volume rate of wave overtopping. This paper investigated the effect of wave overtopping on the property of wave pressure on the composite breakwater by means of model experiments. This irregular wave type was Bretschneider-spectrum. Wave pressure was measured on the face of the breakwater at vertical and upright section. Through Kolmogorov-Smirnov goodness-of-fit to test experimental data, it reveals that Weibull function is a more suitable function to describe the probability distribution of wave pressure where still water level than log-normal and Rayleigh function. It was found from the experimental results that the wave pressure on the breakwater was reduced due to the wave overtopping, which was depended on the incident wave condition and the crest height of the breakwater above the still water level. Regression equation obtained in this study was useful for the water surface elevation and the crest height.
Xu, Guo-Cheng, and 徐國城. "Effect of Wave Overtopping on Irregular Wave Pressure on Breakwaters." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/kuwx24.
Full text國立成功大學
水利及海洋工程學系碩博士班
92
ABSTRACT The purpose of this study was to investigate effect of wave overtopping on irregular wave pressure on breakwaters. We carried out the overtopping experiments of breakwaters with different crown heights by using irregular waves. Then we compared the experimental results to discuss the relationship between the crown height and wave pressure. And we also compared the experimental results with Goda’s formula and Yeh’s (2001) formula with revise from Goda’s formula to discuss Yeh’s (2001) formula can be extends applied in irregular waves. The measurements reveal that the statistical values of total wave pressure due to effect of wave overtopping was reducible ranging 0%∼70%,comparing with the situation of non-overtopping wave upon breakwaters. The decreases in Hc/d、d/Ls and d’/d and increase in Ĥ/d will contribute to the decreases in the wave pressure force. The computation of Goda’s formula will overestimate the actual wave pressure force when wave overtopping. This overestimate wall more obvious when Ĥ/d was higher and d/Ls and Hc/d was lower, along with d’/d reduction, the ratio of overestimate regular meeting increases approximately 20%. Come to the conclusion, Yeh’s (2001) formula will comparatively conforms of the experiment results when wave overtopping. So, we can be extends applied the formula in irregular wave, and it is designing to be more economical and effectiveness.
葉朝棋. "Effect of Wave Overtopping on Wave Pressure on Vertical Wall." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/51375509544393027060.
Full text國立成功大學
水利及海洋工程學系
89
The purpose of this study is to investigate effect of wave overtopping on wave pressure on vertical wall. We carries out the overtopping expriments of vertical wall with different crown heights, by using regular waves. Then we compare the experimental results to discuss the relationship between the crown height and wave pressure. And we compare the experimental results with Sainflou’s and Goda’s formula to discuss whether the formulars can be applied in calculating the wave pressure on vertical wall, in the condition of wave overtopping. The results show, the wave pressure force due to the effect of wave overtopping was reducible ranging 0~45%, comparing with the situation of non-overtopping wave on vertical wall. The decreases in the ratio of the crown height to water depth, , and the ratio of the relative water depth, , will contribute to the decrease in the wave pressure force. The computations of Goda’s formula will overestimate the actual wave pressure force about 0 to 60%. A modified Goda’s wave presure formula has been proposed in this study to calculate wave pressure on vertical wall, in the condition of wave overtopping. And the modified Goda’s formula, which calculates the wave pressure force in wave overtopping, is better than Goda’s formula. Come to the conclusion, the modified Goda’s formula is more suitable for pratical design of vertical wall under the condition of wave overtopping.
Lee, Wei-Ming, and 李偉銘. "Effect of Wave Overtopping on Wave Pressure on Composite Breakwaters." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/6tndfu.
Full text國立成功大學
水利及海洋工程學系碩博士班
90
ABSTRACT The purpose of this study was to investigate effect of wave overtopping on wave pressure upon composite breakwaters. We carried out the overtopping expriments of composite breakwaters with different crown heights by using regular waves. Then we compared the experimental results to discuss the relationship between the crown height and wave pressure. And we also compared the experimental results with Sainflou’s and Goda’s formula to discuss whether the formulars can be applied in calculating the wave pressure upon composite breakwaters, in the condition of wave overtopping. In the end, we added the result of Yeh’s (2001) investigation on vertical walls to our conclusions. The measurements reveal that the total wave pressure due to effect of wave overtopping was reducible ranging 0~40%, comparing with the situation of non-overtopping wave upon composite breakwaters. The decreases in the ratio of the crown height to water depth, , and the ratio of the relative water depth, , will contribute to the decrease in the wave pressure force. The computations of Goda’s formula will overestimate the actual wave pressure force about 30% at the maximum for general design of breakwaters. A modified Goda’s wave presure formula can be used to calculate wave pressures reasonably on composite breakwaters for the condition of wave overtopping. And the modified Goda’s formula, which calculates the wave pressure force with wave overtopping, is better than Goda’s formula. Come to the conclusion, the modified Goda’s formula is suitable for practical design of composite breakwaters under the condition of wave overtopping.
Hwang, Jia Shang, and 黃家祥. "Experimental Study on the Wave Pressure." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/90110742817656924156.
Full textHo, Ming Shian, and 何明憲. "A Study of Transfer Function between Wave Height and Wave Pressure." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/25457062869467323490.
Full textBang, Seunghoon. "Rarefaction wave interaction of pressure-gradient system." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2162/index.html.
Full text楊嘉良. "The development of square pressure wave generator." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/64713661553425638282.
Full text國立臺北科技大學
製造科技研究所
89
This thesis aims to design a technique for the manufacturing of the square pressure waves generator that can generate the square pressure signals to test the dynamic characteristics of the hydraulic system. The square pressure waves generator is composed of several components. The design and manufacture of the high-speed switch among them is the most important technique. The way of the continuous rotation of machine is used to be the principle of the on and off switch of the square pressure waves generator. The differential method is used to achieve the high frequency switch in order to replace the directional control valve that is composed of rotary and slide spools. During the real design and manufacture of the high-speed switch, we find that the function of the square pressure waves generator can be influenced by the important facts, such as surface roughness, clearance, the shape and dimensioning of the cannelure, pressure balance and lubrication. The square pressure waves generator is fabricated by the high-speed switch and other components. It is installed on the test platform and linked up with transmission equipment and driving motor. Thus, the whole square pressure waves generator has been completed with normal function. The test results in different frequency and pressure can achieve the anticipation, and can possess the good shape of the square pressure wave and the high frequency characteristics of 2000Hz. The main tasks of the study is to generate the square pressure wave signals up to the frequency of 2000 Hz in order to raise a direct, effective test equipment to find the dynamic characteristics of the hydraulic control system and can promote the system quality and increase the industrial competition.
Gung, Shu-Sheng, and 龔書聖. "Numerical Analysis of Wave Pressure Transfer Function." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/m9246g.
Full text國立成功大學
水利及海洋工程學系碩博士班
92
The purpose of this study is to co-operate with wave pressure data to analyze wave variety by Fourier approximation method, and derives pressure transfer function Kp; moreover, it probes relationships between transfer function Kp and each wave factor, and an empirical expression of the transfer function between wave height and wave pressure was obtained from these Kp data which is analyzed, then transform the experimental pressure spectrum into a transfer wave spectrum by the empirical expression, which is taken advantage of comparison with experimental wave spectrum to probe into the empirical expression how to apply to irregular wave. The study showed that the statement of the purpose of the study declares that wave height and Kp both must reach specific accuracy, and inaccuracy is getting smaller and smaller when depth of manometer diminishes. There both are obvious existing relationship between transfer function Kp and factors as wave height H、manometer depth z、water depth d and circle T , etc. The empirical expression of the study mentioned is that the parameter H/d、z/d、ω2|z|/g replaces chen (2002)ω2|H|/g、ω2|d|/g、ω2|z|/g, whose accuracy would heave effectively to put regular wave experiment data in use . And transfer wave spectrum coincide with experimental wave spectrum when it put irregular wave in use, and its irregular enlargement is more smaller when transfer wave spectrum is in high frequency , which showed that empirical expression of transfer function can agree with regular wave and irregular wave.
曾健中. "Calculation For Wave Loads and Pressure Acting on a Ship in Waves." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/25764494013007082687.
Full textChia-TzuChang and 張家嬨. "Transfer function between wave height and wave pressure or velocity of flow." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/53sa7b.
Full text國立成功大學
水利及海洋工程學系
104
A series of ocean waves are generated by several regular waves of various sources. To understand the complex and irregular ocean phenomena, this research is based on regular waves. Modeling regular waves to laboratory experiments, and deal with experiment data onto four methods. These methods are transforming the wave pressure to wave height, transforming the wave pressure on velocity of flow, empirical correction formula and dimensional analysis. Base on the experiments with data, to investigate the relationships of wave pressure versus wave height and velocity of flow. The experimental results showed that the empirical correction coefficient N decreases to decreasing period, being greater than T=1(s) for gravity waves. Compare with Bergan, P.O. et al (1968) this research finds the period less than T=0.8(s) for short gravity waves, which it is not available used first-order linear theory to predict the wave pressure. The results showed that transforms function add velocity of flow item, the experimental wave height and theoretical wave height difference vary considerably. Even add velocity to the transform function, wave height still show inexact data onto the equation, and can’t predict surface water. This study directed applies to experiment with regular wave data, and used dimensional analysis to find the empirical correction formula. The results showed that the new empirical correction formula could apply to all regular wave experiments.
Chiu, Yung-Fang, and 邱永芳. "Transfer function between wave height and wave pressure or water particle velocity." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/43263828926937874949.
Full textLiang, Cheng-Syu, and 梁呈旭. "The Double-crest Phenomenon of Wave Pressure In the Standing Wave Field." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/60582713579323972150.
Full text國立中山大學
海洋環境及工程學系研究所
100
The real phenomena of sea surface are interacting by much kind of different waves.In these phenomena, the gravity standing wave is most important. The gravity standing wave is formed by two progressive waves that possessing same properties but opposite directions. Gravity standing wave can also form by the interaction of a progressive wave with it’s totally reflection wave. Because of the nonlinear interaction of two waves, there must result a double-crest phenomenon of wave pressure. It is dangerous for the navigation of ship when the double-crest appears, and it’s certainly to take the phenomenon into consideration when we are going to design a jetty. In this paper, it bases on the reference of Chen (1989, 1990) who obtained a third-order approximation of two-wave trains interactions in a uniform depth wave field. Further, in this paper, it checks the result that the double-crest phenomenon is formed by which one of these nonlinear terms. Furthermore, research the influences of wave steepness, wave periods, and water depths these factors will cause the crest diverges is also the purpose.
Tseng, Chien-Kuei, and 曾建貴. "Wave-Induced Pore Pressure in Rubble Mound Breakwaters." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/59030392397870785120.
Full textTang, Shih-Tse, and 唐世澤. "Water Surface Elevation Recovery from Wave Pressure Signals." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/32610434592276746584.
Full text國立交通大學
土木工程學系
84
In the present study an empirical transfer function between the wave pressure and wave height,which was established by Kuo and Chiu(1994) ,was applied to predict the history signals of the free water surface elevation from the wave pressure beneath the still water level.The Fast Fourier Transform(FFT) method is used to calculate the power spectral and history signals of wave height.The FFT method is compared with LCM method developed by Nielsen(1986) in this paper.It is found that both of FFT method and LCM method are accurately calculated when the pressure gages are locatted near the still water level.However, when the distance between the pressure gage and the still water level is longer,the FFT method with the empirical transfer function is more efficient and accurate than the LCM method. Furtherwore,the present study has decided on the cutoff frequency range,the weak point of the power spectral analisis which was resolved in this paper. Furthermore,the present study used the physical model test to investigate the transfer function between the wave pressure and the wave height in shallow water. By the analysis from the experimental data, we can find the transfer function is concern with the wave frequency and pressure gage locations. In addition ,the transfer functions of each older nonlinear components seem to be the same.
YOU, YU-ZHENG, and 游于正. "Experimental study on shock pressure by Yandom wave." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/10249088979026188314.
Full textChen, Sung-Hui, and 陳松輝. "Transfer Function between Surface Wave and Subsurface Pressure." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/86889653229720064854.
Full text國立成功大學
水利及海洋工程學系碩博士班
91
The purpose of this study is to investigate how to transform the wave pressure to surface wave. Based on the experimental data, a pressure transfer function was developed. A comparison with the wave spectrum calculated by present result, linear pressure response function and Chiu et al. transfer function (1993) was carried out to evaluated the application of each transfer functions. The result of the study shows that the transfer function is related to the dimensionless parameterw^2|z|/g,w^2d/g and w^2H/g. It is different with the result of Chiu et al.(1993). The spectrum obtained by linear pressure response function and Chiu et al.(1993)is underestimated at the short significant wave period, deep water and large significant wave height. The estimation of wave spectrum using the pressure transfer function of this study is more accurate and is not influence by the depth of the gauge.
Lin, Yen-Chih, and 林彥志. "Dynamic Characteristic of Reciprocating Pressure Square-wave Generator." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/vsg8xn.
Full text國立臺北科技大學
機電整合研究所
97
The dynamic characteristics of the hydraulic system are the key factor for detailed control. This study aims to investigate the dynamic characteristics of square wave which produce from a reciprocating pressure square wave generator (RPSWG). RPSWG consists of 3-way 2-position valve and a spool which excited by a solenoid to generate pressure square wave. Experimental parameters are hydraulic input pressure, frequency, back pressure, spool velocity, and chamber volume. A piezoelectric pressure sensor was used for measuring the dynamic pressure of hydraulic system through the Fourier Fast Transform analyzer. system identification obtained with MATLAB analyzing software. As a result, the hydraulic pressure increases cause the system instable. The higher operating frequency makes The shorter time of steady state to promote the velocity of response. The back pressure increases cause the overshot reduction and the rising time increase. The speed of spool is quicker then the transition state will be shorter. The chamber volume of pressure is smaller can reduce the period of transition state and increase the reaction rate.
BenjaminTsai and 蔡潔忞. "Wave-Induced Pore Pressure Changes in Sandy Seabed." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/tn787k.
Full textSutar, Pawan. "Numerical Simulation of Pressure Wave Supercharger with Pockets Operating at Different Speeds." Thesis, 2020. http://hdl.handle.net/1805/25882.
Full textPressure wave supercharger is an application of wave rotor technology that utilizes compression waves produced by high-pressure engine exhaust gas to compress the fresh intake air within the channels. The phenomena within the wave rotor channels are governed by compression and expansion waves initiated when the channel ends are periodically exposed to differing pressure ports. Two incoming fluids are brought into contact for a very short amount of time to facilitate efficient energy and momentum transfer, thereby exchanging pressure dynamically between the fluids by means of unsteady pressure waves. Since the energy transfer is based on unsteady pressure waves, correct matching of waves and ports is essential for optimum results. Mistiming of the waves in the channels is detrimental to the efficient exchange of pressure and low-pressure exhaust scavenging, which ensures minimum exhaust gas recirculation. Due to varying speed and load conditions of the unit to be supercharged, it is not always possible to maintain the rotor speed constant at the design point. To mitigate the effects of wave mistiming due to varying speed, a well-designed combination of wall-pockets was used in Comprex® pressure wave supercharger. The wall-pockets are the recesses provided in the endplates of pressure wave superchargers to create necessary pressure zones at desired locations. This thesis details an extensive qualitative and computational investigation of the performance of pressure wave superchargers with pockets. Numerical simulations of pressure wave superchargers have been performed using the wave rotor analysis codes employed at the Combustion and Propulsion Research Laboratory at IUPUI. This work also pays close attention to inspecting the numerical schemes and modeling of different physical phenomena used in each code. A comparative verification of the wave rotor analysis codes has been conducted to ensure that the same fundamental numerical scheme is correctly implemented in each code. The issue of low-pressure scavenging has been demonstrated by simulating the four-port (pocketless) pressure wave supercharger operating at lower speeds. The wall-pockets have been modeled using a simple lumped volume technique. The gas state in the lumped volume of pockets is estimated using the continuity and energy equations such that the net mass and energy fluxes between each pocket and the wave rotor channels are close to zero. The lumped volume models of pockets have been implemented in the four-port wave rotor configurations to simulate the pressure wave superchargers with pockets. The simulation results show that the pockets assist to maintain sufficient pressure in the desired zones to facilitate proper low-pressure scavenging during lower rotor speed operations. The Comprex simulation results have been observed to be in good agreement with experimental data and qualitative analysis. Specific observations on the performance of each code and comprehensive simulation results have been presented.
Wadzuk, Bridget Marie Hodges Ben R. "Hydrostatic and non-hydrostatic internal wave models." 2004. http://repositories.lib.utexas.edu/bitstream/handle/2152/1428/wadzukb05259.pdf.
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