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Dissertations / Theses on the topic 'Rotor characteristics'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Sutkowy, Mark Louis Jr. "Relationship between Rotor Wake Structures and Performance Characteristics over a Range of Low-Reynolds Number Conditions." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534768619864476.

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2

Colombo, Francesco. "Service-like thermo-mechanical fatigue characteristics of 1CrMoV rotor steel /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17070.

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3

Guo, Jenq-Shan. "Characteristics of the nonlinear hysteresis loop for rotor-bearing instability." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1062688989.

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4

Vaishya, Manish. "Vibro-acoustic characteristics of sliding friction in geared rotor systems /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486394475977383.

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5

You, Jae Hun [Verfasser]. "Aeroacoustic Characteristics of a Shrouded Helicopter Tail Rotor / Jae Hun You." München : Verlag Dr. Hut, 2018. http://d-nb.info/1162767235/34.

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6

Mat, Isa Ahmad A. "An investigation of the dynamic characteristics of a bolted-rotor system." Thesis, Aston University, 2001. http://publications.aston.ac.uk/11837/.

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A Jeffcott rotor consists of a disc at the centre of an axle supported at its end by bearings. A bolted Jeffcott rotor is formed by two discs, each with a shaft on one side. The discs are held together by spring loaded bolts near the outer edge. When the rotor turns there is tendency for the discs to separate on one side. This effect is more marked if the rotor is unbalanced, especially at resonance speeds. The equations of motion of the system have been developed with four degrees of freedom to include the rotor and bearing movements in the respective axes. These equations which include non-l

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7

Симоновський, Віталій Іович, Виталий Иович Симоновский, Vitalii Iovych Symonovskyi, Олександр Іванович Беда, Александр Иванович Беда та Oleksandr Ivanovych Beda. "Вплив спірального потоку у шпаруватому ущільненні на динамічні характеристики ротора". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8001.

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8

Yang, Baozhong. "On the characteristics of fault-induced rotor-dynamic bifurcations and nonlinear responses." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1135.

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Rotor-dynamic stability is a very important subject impacting the design, control, maintenance, and operating safety and reliability of rotary mechanical systems. As rotor-dynamic nonlinearities are significantly more prominent at higher rotary speeds, the demand for better and improved performance achievable through higher speeds has rendered the use of a linear approach for rotor-dynamic analysis both inadequate and ineffective. To establish the fundamental knowledge base necessary for addressing the need, it is essential that nonlinear rotor-dynamic responses indicative of the causes of n

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9

Chitroju, Rathna. "Improved performance characteristics of induction machines with non-skewed symmetrical rotor slots." Licentiate thesis, KTH, School of Electrical Engineering (EES), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11510.

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<p>Induction machines convert more than 55% of electrical energy into various other forms in industrial and domestic environments. Improved performance, especially by reduction of losses in induction machines hence can significantly reduce consumption of electricity. Many design and control methods are adopted to make induction machines work more efficiently, however certain design compromises are inevitable, such as skewing the rotor to improve the magnetic noise and torque characteristics increase the cross current losses considerably in a cage rotor, degrading the efficiency of the motor. C

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10

Nováková, Naděžda. "Dynamické radiální síly působící na oběžné kolo odstředivého čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230329.

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This thesis deals with the radial forces acting on the impeller of a centrifugal pump. It focuses on the centrifugal pump type BETA 26. It addresses forces acting on the pump shaft. These forces are converted into the impeller. The most extensive part of this thesis is devoted to the experimental measurement and evaluation. The results are summarized and processed graphically.

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11

Larsson, Sebastian. "Wind turbines - a study on the correlation between rotor size and noise characteristics." Thesis, Högskolan i Halmstad, Energivetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28979.

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Wind power is a massively increasing energy source in the European Union, due to the 2020 goals that 20% of EU:s energy flow has to originate from renewable sources. Big wind turbines produce low frequency noise, which is a growing problem as the rapid technical development leads to larger and larger turbine. This master thesis aims to examine the frequency distribution of the noise emitted from wind turbines of different sizes with the ultimate goal to establish trends. Using sound recordings from Vestas V27, V42 and V90 turbines, the noise is divided into octave bands using MATLAB to study t

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12

Rowan, D. "Design and development of a high-speed test facility and the measurement of the fluid film characteristics of journal bearings." Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/11357.

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In the theoretical analysis of high speed rotor bearing systems, it is common to use four displacement and four velocity based coefficients, which characterise the behaviour of the lubricating fluid film. Although a great deal of work has been published establishing theoretical models of all types of hydrodynamic journal bearings, the large amount of experimental work has centred on relatively low speed conditions. This work presents a contribution to the experimental study of the static and dynamic characteristics of oil films in journal bearings used in high-speed rotating machinery. The mai

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13

Gamal, Eldin Ahmed Mohamed. "Analytical and experimental evaluation of the leakage and stiffness characteristics of high pressure pocket damper seals." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/16.

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This thesis presents numerical predictions for the leakage and direct stiffness coefficients of pocket damper seals. Modifications made to earlier flow-prediction models are discussed. Leakage and static pressure measurements on straight-through and diverging configurations of eight-bladed and twelve-bladed seals were used for code validation and for calculation of seal discharge coefficients. Higher than expected leakage rates were measured in the case of the twelve-bladed seal, while the leakage rates for the eight-bladed seals were predicted reasonably accurately. Results are presented f

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14

Arisi, Allan Nyairo. "Heat Transfer and Flow Characteristics on the Rotor Tip and Endwall Platform Regions in a Transonic Turbine Cascade." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/64501.

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This dissertation presents a detailed experimental and numerical analysis of the aerothermal characteristics of the turbine extremity regions i.e. the blade tip and endwall regions. The heat transfer and secondary flow characteristics were analyzed for different engine relevant configurations and exit Mach/Reynolds number conditions. The experiments were conducted in a linear blowdown cascade at transonic high turbulence conditions of Mexit ~ 0.85, 0.60 and 1.0, with an inlet turbulence intensity of 16% and 12% for the vane and blade cascade respectively. Transient infrared (IR) thermography t

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15

Савченко, Г. І., Іван Володимирович Павленко, Иван Владимирович Павленко та Ivan Volodymyrovych Pavlenko. "Імовірнісний розрахунок характеристик запірно-урівноважуючого пристрою ротора багатоступінчатого відцентрового насоса". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/37807.

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Аналіз характеристик запірно-врівіноважуючого пристрою свідчить про необхідність урахування можливого відхилення фізичних і геометричних параметрів гідромеханічної системи від значень, обраних у проектному розрахунку.<br>У роботі досліджений запірно-урівноважуючий пристрій ротора багатоступінчатого відцентрового насоса, для якого визначені математичні очікування та середньоквадратичні відхилення статичної і витратної характеристик. Створена комп’ютерна програма, яка містить процедури генерації випадкових вихідних параметрів і отримання статичних і витратних характеристик.<br>В работе исследова

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16

Van, Der Velde Alvarez Daniel Eduardo. "Test versus predictions for rotordynamic and leakage characteristics of a convergent-tapered, honeycomb-stator/smooth-rotor annular gas seal." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1156.

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17

You, Jae Hun [Verfasser], Christian W. M. [Akademischer Betreuer] Breitsamter, Christian W. M. [Gutachter] Breitsamter, and Stefan [Gutachter] Becker. "Aeroacoustic Characteristics of a Shrouded Helicopter Tail Rotor / Jae Hun You ; Gutachter: Christian W. M. Breitsamter, Stefan Becker ; Betreuer: Christian W. M. Breitsamter." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1160381151/34.

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18

Біденко, І. Г. "Імовірнісний підхід до визначення основних характеристик системи "ротор-шпаринні ущільнення" відцентрового насоса. Вплив імовірнісного характеру параметрів системи "ротор-шпаринні ущільнення" на вібраційні характеристики відцентрового насоса". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/71068.

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Робота присвячена дослідженню силових гідродинамічних факторів, що виникають під час течії рідини в циліндричних дроселюючих каналах ущільнень відцентрових машин. Ротор і ущільнення розглядаються при цьому як замкннена гідромеханічна система, у якій роль зв’язуючої ланки виконує перекачуване середовище, його інерційні і гідродинамічні характеристики. Вплив середовища особливо істотний при наявності великих градієнтів швидкостей і тисків. Такі умови саме і характерні для малих зазорів шпаринних ущільнень, на яких дроселюються великі перепади тиску, а одна зі стінок належить ротору, що о

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19

Muczka, Vojtěch. "Zvýšení účinnosti jednofázového asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377331.

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This thesis is dedicated to efficiency increase of one phase induction machine through material change of induction cage and rotor slot shape optimization under the condition of maintaining the same locked-rotor torque. In the first part of this thesis is the explanation of induction machine principles. Next is the comparison of measured and simulated parameters of small one phase machine from ATAS company. The following part is dedicated to the analysis of rotor slot shape and ring size influence on machine parameters when using pure aluminum instead of resistive alloy. The next chapter deals

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20

Беда, Олександр Іванович, Александр Иванович Беда та Oleksandr Ivanovych Beda. "Динамічні характеристики ротора відцентрового насоса з урахуванням особливостей гідродинамічних процесів в шпаринних ущільненнях довільної довжини". Thesis, СумДУ, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41750.

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У дисертаційній роботі виконано уточнення математичної моделі шпаринного ущільнення з урахуванням спірального руху робочої рідини, обумовленого як обертанням валу так і полем тиску рідини в шпарині. Розроблено аналітичний метод розрахунку в лінійній постановці складових радіальної сили. Проведено аналіз нелінійності гідростатичної сили, обумовленої радіальним зміщенням валу. Отримано, що дана сила має м’яку характеристику жорсткості. Проведений фізичний експеримент, який дав змогу оцінити вплив окружних перетоків рідини на величину гідростатичної сили. У відносно довгих шпаринах експерименталь

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21

Rawal, Dharamendra Niranjan. "Study of the effect of sensor position on the forced response characteristics of rotors with active magnetic bearings." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41604.

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The need for better performance of turbomachinery with active magnetic bearings has necessitated a study of such systems for accurate prediction of their vibrational characteristics. This research presents a modification of existing transfer matrix methods for rotor analysis, to predict the response of rotor systems with active magnetic bearings. The position of the magnetic bearing sensors is taken into account and the effect of changing sensor position on the vibrational characteristics of rotor systems is studied. The modified algorithm is validated using a simpler modified Jeffcott model.

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22

He, Tian. "Effects of rotor configurations on the characteristic torque of a variable-reluctance spherical motor." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16642.

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23

Vennam, Sandeep. "Hygrothermal effects on free vibration characteristics of rotating composite beams." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4969.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains xi, 72 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 69-72).

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24

石田, 幸男, Yukio ISHIDA, 軍. 劉 та Jun LIU. "不連続ばね特性を利用した回転機械の不安定領域の除去". 日本機械学会, 2006. http://hdl.handle.net/2237/9038.

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25

Min, Byung-Young. "A physics based investigation of gurney flaps for enhancement of rotorcraft flight characteristics." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33851.

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Helicopters are versatile vehicles that can vertically take off and land, hover, and perform maneuver at very low forward speeds. These characteristics make them unique for a number of civilian and military applications. However, the radial and azimuthal variation of dynamic pressure causes rotors to experience adverse phenomena such as transonic shocks and 3-D dynamic stall. Adverse interactions such as blade vortex interaction and rotor-airframe interaction may also occur. These phenomena contribute to noise and vibrations. Finally, in the event of an engine failure, rotorcraft tends to desc

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26

Mingardi, Damiano. "Analysis, design and test of high efficiency electrical machines with a rotor winding." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3422394.

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This thesis deals with the analysis, design and test of three-phase high efficiency electrical motors, with particular reference to motors with a rotor winding. At first, the background and the motivations of this work are described. The bibliography on the subjects is deeply examined and a selection of the most relevant papers can be found in the reference. In this scenario, the main objective of this thesis are illustrated. The Line-Start (LS) Synchronous Machine (SyM) design is a subject under investigation since the beginning of the last century, when solid state power converters was not

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27

Boukider, Akli. "Conception des pompes centrifuges assistee par ordinateur : dimensionnement et trace, optimisation du profil meridien." Paris, ENSAM, 1988. http://www.theses.fr/1988ENAM0001.

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28

Štaffa, Jiří. "Ztráty jednofázového asynchronního motoru s trvale připojeným kondenzátorem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221263.

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This project deals with increasing efficiency of one phase induction motor with permanent split capacitor. We can whole thesis divide into two parts, the first one is basic and the second is interested in analysis and measurement. First part handles with construction of single phase induction motor, explanation of function principle, start and run of motor. Calculating of efficiency including type of losses, which reduce efficiency. Second part concerns analysis losses including moment load characteristic, motor measurement while rotor is locked, with no load operation, measuring mechanical an

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29

Mokhtar, Md Asjad. "Rotordynamic studies on the rotor-stator contact interaction." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7957.

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30

Wu, Ming-Chuan, and 吳明川. "Dynamic Characteristics of Rotor Systems Containing Cracked Components." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/86259978119560847027.

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碩士<br>國立台灣工業技術學院<br>機械工程技術研究所<br>85<br>The dynamic behaviors of cracked rotating components (shaft and blade)of rotor systems were investigated. With the crack released energy, thelocal flexibility due to crack was evaluated. An energy principle inconjunction with the assumed- modes method or the weighted residual methodwere applied to yield the discrete equations of motion. In this paper, three different topics with cracked shaft and crackedblades were discussed, numerical examples were

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31

LIN, PING-TUNG, and 林平同. "Identification of Linearized Characteristics of Bearings in Rotor Systems." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/79605887298489269172.

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碩士<br>中華大學<br>機械與航太工程研究所<br>87<br>ABSTRACT This research presents a new method based on the finite element model for estimating linearized characteristics of bearings in rotor-bearing systems including the flexible shaft, which may be changed stepwise along the axial direction, rigid disks, and linearized bearings. The method is dependent on the information about the shaft elements which connect to the estimated bearing. In this research, we discussed two cases (1) the characteristics of the shaft elements in the vicinity of the supports are known (2) the rigidities of the sha

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32

Chun-LinChen and 陳春霖. "Dynamic Characteristics Analysis on Rotor System with Soft Supports." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/38104538988149551398.

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33

Chang, Jer-Rong, and 張哲榮. "A Study on Dynamic Characteristics of Geared Rotor-Bearing System." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/83738202872182721874.

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博士<br>國立成功大學<br>航空太空工程學系<br>85<br>This thesis is concerned with the dynamic analysis of a geared rotor-bearing system. A finite element model of the geared rotor-bearing system is developed by taking account of the lateral-torsional coupling effect to obtain the natural frequencies, mode shapes, and the steady-state responses. From the response time histories, the FFT spectra can be obtained to investigate the effects of dynamic coupling terms under different grades of balance quality and s

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34

Chen, Juhn-Horng, and 陳俊宏. "Identification of Linearized Characteristics of Bearings in Rotor-Bearing Systems." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/24464136957993458029.

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35

Kroninger, Christopher M. "Characteristics of a rotor optimized for hover and forward flight." 2008. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2734/index.html.

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36

CHONG, MING-HAN, and 鍾明翰. "Study on Aerodynamic Characteristics of Coaxial Rotor Vehicle in Forward Flight." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/kz7tcc.

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碩士<br>逢甲大學<br>航太與系統工程學系<br>105<br>In this study, coaxial rotor vehicles with rotor-fuselage combination are simulated numerically to study the aerodynamic characteristics under various operating conditions during the forward flight. The upper and lower rotor each consists of three blades. Two kinds of rotor blade, NACA 0012 (symmetrical wing) and Viper-X (asymmetric wing), are considered. For the latter, in addition, the rotor blade tips with sweepback angles of 20, 35 and 40 deg are taken into accout. The numercial simulations are performed using the commercial package ANSYS/Fluent with mixed

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Lo, Wu-Jen, and 羅武仁. "Dynamic Characteristics Analysis and Testing of a Microturbine Rotor-Bearing System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/61932283777594980230.

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碩士<br>國立清華大學<br>動力機械工程學系<br>91<br>This paper can be divided into two parts, which are numerical analysis and experimental equipment construction and testing. In numerical analysis, we mainly use the finite element method as our basis and MATLAB program design software as our tool, to write the numerical analysis program for a rotor-bearing system. This rotor-bearing system consists of rigid disks, distributed parameter finite rotor elements, and discrete bearings. During modeling of the system, the finite element model includes the effects of translation inertia, rotatory inertia, g

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CHEN, KUAN-TING, and 陳冠廷. "Three-dimensional Flow Field Characteristics and Leakage Analysis of Rotor Engine." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/46jbpj.

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碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>107<br>In this study, the module of the three-dimensional rotor engine is constructed to analyze and discuss its characteristics. Firstly, the three-dimensional fluid module of the triangular rotor engine is constructed, and the research process is planned. The pre-processing mesh is firstly divided, and the fluid analysis program Fluent is used. Analyze. The flow rate, pressure, leakage, etc. of the gas under the three-dimensional module are observed by different types of fluids. Based on the three-dimensional module of the triangular rotor engine, the model

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Huang, Chun-Jung, and 黃俊榮. "A STUDY ON DYNAMIC CHARACTERISTICS OF GEARED ROTOR-BEARING SYSTEM WITH CRACK." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/58896036507200956668.

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博士<br>國立成功大學<br>航空太空工程學系碩博士班<br>91<br>In this thesis, the dynamic analysis of a geared rotor-bearing system with an open crack or a breathing crack is discussed. A simple analytic model of a geared rotor system is developed by taking into account the effect of an open transverse surface crack for determination of natural frequencies, critical speeds, and stability of the system. The existing crack results in a local flexibility of the shaft and it is replaced by a set of springs based on the balance of energy. The effect of the crack results in a periodic time-varying system. From the response

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40

Yang, Ding-Wen, and 楊丁文. "The Studies of Static/Dynamic Characteristics and Stability in Rotor-aerostatic Bearing System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/44533345787232415616.

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博士<br>中原大學<br>機械工程研究所<br>97<br>Abstract This project has dealt with the integrated research of the spindles with aerostatic bearings. The contents include studies in load capacity, stiffness, damping ratio, critical inertial force, critical whirl ratio for aerostatic-bearing spindle, analysis for simulating the influences of design parameters in operation performances and characteristics and optimal design for aerobearing-spindle system. The Reynolds equation is solved by the finite difference method and numerical integration to yield static and dynamic characteristics of air film. The motion

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41

Guan, Zhi-Pin, and 官志彬. "Dynamic Characteristics Analysis and Testing of a Turbo Molecular Pump Rotor-Bearing System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/43607223254418828101.

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42

Huang, Yu-Meng, and 黃裕盟. "Vibration Characteristics Analysis and Modal Testing of a Turbo Molecular Pump Rotor-Bearing System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/50303943730299618843.

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碩士<br>國立清華大學<br>動力機械工程學系<br>98<br>This study is focused on the dynamic characteristics of a vertical turbo molecular pump rotor-bearing system. The research methods can be divided into two parts, which are numerical analysis and experimental measurements. In numerical analysis, we use the finite element analysis software ANSYS and DyRoBeS to construct a two-dimensional and three-dimensional model of the rotor-bearing system. In the analysis process, by constantly changing the pump system assembly methods we can correct and verify the rotor-bearing system finite element model under different bo

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Hsu, Wei Chun, and 徐煒峻. "A STUDY ON DYNAMIC CHARACTERISTICS OF NONLINEAR ROTOR SYSTEMS MOUNTED WITH HYDRODYNAMIC THRUST BEARINGS." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/61974295698512921385.

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博士<br>國立中正大學<br>機械系<br>93<br>The dynamic response and characteristics of a hydrodynamic thrust bearing-mounted rotor is investigated when the rotor is subjected to a constant or harmonic axial force. There have been researches, which point out the significant effects of the thrust bearing on the rotor lateral vibration. Thus the coupled axial and lateral vibration of a hydrodynamic thrust bearing-mounted rotor system is investigated in this study. The thrust bearing is considered with three hydrodynamic oil films, one in the journal part of the thrust collar and two on both sides of the thrust

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Chou, Yu-Wei, and 周有偉. "A Study on the Dynamic Characteristics of Geared Rotor-Bearing System with Hybrid Method." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/00618026860554916231.

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碩士<br>國立成功大學<br>航空太空工程學系<br>81<br>A new technique called Hybrid Method is proposed in the analysis of the geared rotor-bearing system. This technique combines the Finite Element Method and the Generalized Polynomial Expansion Method to formulate the system equations of motion. The compliance and shear deformation of the shaft element, flexibility and damping of the bearings, stiffness and damping and pressure angle of the gear mesh are considered. The coupling between the torsional and late

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WEI, YU-JEN, and 魏裕仁. "Numerical Study on Aerodynamic Interaction and Aeroacoustics Characteristics between Rotor Disks of Coaxial Helicopter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/96653247005440445244.

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碩士<br>逢甲大學<br>航太與系統工程學系<br>105<br>Compared with another type of helicopters, the coaxial rotor has the advantages of greater lift capacity, higher maneuverability and more compact. Thus, it is allowed to operate in places where others cannot. Consequently, this study conducts numerical analysis to learn the aerodynamic and aeroacoustics characteristics of the coaxial rotor in more detail and then the simulated results are validated with the experimental acoustic data. In this research, the aerodynamics characteristics of a single rotor, coaxial rotor and coaxial rotor with fuselage are analyze

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宋軍豪. "Characteristics Analysis of a Novel Three-phase Induction Motor with Different Rotor Slots Number." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5nmnsu.

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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>This thesis proposes a novel design of a three-phase energy-saving induction motor with wound rotor using the equivalent circuit method and Taguchi method as the analytical basis. The equivalent circuit parameter values of the induction motor are calculated from its mechanical structure sizes, then according to the electric machinery theory, the electrical characteristics of the induction motor are analyzed by the equivalent circuit. This is followed by adjusting mechanical structure size, such as core slot angles, wire diameters and air-gap length to observe

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Wilkes, Jason C. "A PERSPECTIVE ON THE NUMERICAL AND EXPERIMENTAL CHARACTERISTICS OF MULTI-MODE DRY-FRICTION WHIP AND WHIRL." 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2008-08-44.

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The present work investigates the nature of dry-friction whip and whirl through experimental and numerical methods. Efforts of the author, Dyck, Pavalek, and coworkers enabled the design and construction of a test rig that demonstrated and recorded accurately the character of multi-mode dry-friction whip and whirl. These tests examined steady state whip and whirl characteristics for a variety of rub materials and clearances. Results provided by the test rig are unparalleled in quality and nature to those seen in literature and possess several unique characteristics that are presented and discu

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Chang, Chia-Lun, and 張家綸. "The Characteristics Study of Bilateral Oil Magnetic Hybrid Hydrodynamic Bearings Rotor System in Low Speed." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/bx78pc.

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碩士<br>中原大學<br>機械工程研究所<br>102<br>The spindles need to use the bearings to suspense the rotor in the rotating machines. In these bearing systems, the fluid hydrodynamic bearings with low noise, high precision, low vibration, long lifetime, and suitable running in the long time operation are more commonly be used in the heavy load system or the long time operation systems.The load capacity of the fluid hydrodynamic bearings as starting or operating at low speed are very small. The phenomenon of dry rub in the bearing and journal will occur and would damage the rotor system. Therefore, in this st

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Chouksey, Manoj. "Studies in modal anaysis, frequency response characteristics and finite element model updating of rotor systems." Thesis, 2012. http://localhost:8080/iit/handle/2074/5305.

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Kushwaha, Vishwajeet. "Analysis of torsional vibration characteristics for multi-rotor and gear-branched systems using finite element method." Thesis, 2012. http://ethesis.nitrkl.ac.in/3454/1/ethesis_vishwajeet(108me038).pdf.

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Torsional vibrations occur due torelative oscillatory motions superposed on the mean rotation. Rotating systems at running speed near the natural frequencies are prone to excessive angular deflections and hence large stresses which can cause rotating components failure or premature fatigue failures. The objective of the present work is to study the torsional vibration characteristics of multi-rotor and gear-branched systems suing finite element method. Finite element method (FEM) is a numerical technique based on principle of discretization to find approximate solutions to engineering problems

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