Relevant bibliographies by topics / Rotori

Contents

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

Academic literature on the topic 'Rotori'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Rotori"

1

Mao, Xiaochen, and Bo Liu. "Numerical investigation of tip clearance size effect on the performance and tip leakage flow in a dual-stage counter-rotating axial compressor." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 3 (2017): 474–84. http://dx.doi.org/10.1177/0954410016638878.

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Based on a validation of the numerical methods with an experiment, numerical simulations are carried out to study the effect of tip clearance size on the performance and tip leakage flow in a dual-stage counter-rotating axial compressor. The predicted results showed that the variation of the tip clearance size in rotor2 has a more significant impact on the overall performance and stall margin of the compressor. In addition, the impact of the tip clearance size effect is mainly on the rotor with the tip clearance size variation. The variation of the tip clearance size in rotor2 almost has no in
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Hou, Xukui, Ende Wang, Hui Cao, Yalong Zhu, and Kai Qi. "Research on Dynamic Balance Adjustment Method of Single Braced Frame Gyroscope Rotor." MATEC Web of Conferences 256 (2019): 02005. http://dx.doi.org/10.1051/matecconf/201925602005.

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The uneven mass distribution of gyro rotors results in vibration, rotation and drift of gyro rotors, which seriously affect the performance index and life of gyro rotors. However, because there is no rigid connection between the rotary shaft and the shell of the gyro rotor, the dynamic balancing machine can only balance the vibration component of the single braced frame gyroscope rotor, and can’t measure the gyro rotor’s rotation component. By analyzing the influence of uneven rotor mass distribution on the gyro rotor performance, a method of eliminating two rotational degrees of freedom of th
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Laube, Tomasz, and Janusz Piechna. "Analytical and Numerical Feasibility Analysis of a Contra-Rotary Ramjet Engine." Energies 13, no. 1 (2019): 163. http://dx.doi.org/10.3390/en13010163.

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A new idea for a contra-rotary ramjet engine is presented. To define the theoretical limits of the non-typical, contra-rotary ramjet engine configuration, its analytical model was developed. The results obtained from that model and the analytical results were compared with those received from numerical simulations. The main weakness of existing rotary ramjet engine projects is the very high rotational speed of the rotor required for achieving supersonic inlet flow. In this paper, a new idea for a contra-rotary ramjet engine (CORRE) is presented and analyzed. This paper presents the results of
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Liu, Yongmeng, Yingjie Mei, Chuanzhi Sun, et al. "Multistage Asymmetric Rotors Coaxial Measurement Stacking Method Based on Minimization of Exciting Force." Symmetry 13, no. 6 (2021): 1054. http://dx.doi.org/10.3390/sym13061054.

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The unbalanced exciting force of high-speed rotary asymmetric rotor equipment is the main factor causing rotor vibration. In order to effectively suppress the vibration of the asymmetric rotor equipment, the paper establishes a multistage asymmetric rotor coaxial measurement stacking method that minimizes the exciting force. By analyzing the propagation process of the centroid of the multistage asymmetric rotor assembly and analyzing the relationship between the geometric center and the centroid of a single asymmetric rotor, a multistage asymmetric unbalanced rotor propagation model based on g
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Calgaro, Marcelo, Adroaldo Dias Robaina, and Márcia Xavier Peiter. "CURVAS DE DESEMPENHO OPERACIONAL DE BOMBAS CENTRÍFUGAS DETERMINADAS A PARTIR DAS CARACTERÍSTICAS FÍSICAS DO ROTOR I - VALORES NOMINAIS." IRRIGA 9, no. 1 (2004): 19–30. http://dx.doi.org/10.15809/irriga.2004v9n1p19-30.

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CURVAS DE DESEMPENHO OPERACIONAL DE BOMBAS CENTRÍFUGAS DETERMINADAS A PARTIR DAS CARACTERÍSTICAS FÍSICAS DO ROTORI - VALORES NOMINAIS Marcelo Calgaro1; Adroaldo Dias Robaina1; Márcia Xavier Peiter21Departamento de Engenharia Rural, Universidade Federal de Santa Maria, Santa Maria, RS, calgaro@mail.ufsm.br2Curso de Engenharia Agrícola, Universidade Regional Integrada do Alto Uruguai e das Missões – URI, Santiago, RS. 1 RESUMO Este trabalho teve como objetivo desenvolver uma metodologia com a finalidade de determinar os valores nominais da vazão, altura manométrica, rendimento, potência requerid
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Wang, Guangding, Xiaole Wang, Chuanliu Xie, and Huiqun Yuan. "Whirl dynamics of an axially functionally graded liquid-filled rotor considering shear deformation and rotary inertia." AIP Advances 12, no. 6 (2022): 065303. http://dx.doi.org/10.1063/5.0094880.

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In this study, whirl characteristics and stability of an axially functionally graded (AFG) liquid-filled rotor are investigated. The rotor is modeled based on the spinning Timoshenko beam theory. The governing equations for flexural vibration are derived via Hamilton’s principle. For pinned–pinned AFG liquid-filled rotor, the analytical solutions are derived for both the exact whirl frequency equation and the stability model. To validate the present formulations, comparative studies by numerical solutions available in the literature are conducted. Some numerical examples are performed to inves
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Mimmi, G., and P. Pennacchi. "Analytical model of a particular type of positive displacement blower." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 213, no. 5 (1999): 517–26. http://dx.doi.org/10.1243/0954406991522743.

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Many papers exist in the literature that deal with the twin-screw compressor. This usually has two different rotors, a male and a female, and is commonly used to produce compressed gas for industrial uses. However, a different type of positive displacement rotary compressor with two screws is sometimes used, one of its typical applications being in car engine supercharging. The present paper deals with the latter type, which is defined as a two-screw blower. This blower has two identical helical rotors, each with three lobes. The kinematics and the geometry of the rotors are analysed here, and
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Lee, A.-C., and Y.-P. Shih. "Identification of the Unbalance Distribution and Dynamic Characteristics of Bearings in Flexible Rotors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 5 (1996): 409–32. http://dx.doi.org/10.1243/pime_proc_1996_210_216_02.

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This paper presents a new method for estimating dynamic characteristics of bearings and unbalance distribution in flexible rotors based on the transfer matrix method for analysing the steady state responses of rotor-bearing systems, in which rotary inertia, gyroscopic and transverse-shear effects are also considered. Identification can be realized from the measured response data influenced by bearing characteristics and rotor unbalance using the least-squares method. Justification of the method is presented by numerical simulations.
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Kondratyuk, Dmitry, and Vitaliy Komaha. "DETERMINATION OF THE MAIN PARAMETERS OF THE ROTARY MOWER CUTTING APPARATUS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 3(110) (October 30, 2020): 77–85. http://dx.doi.org/10.37128/2520-6168-2020-3-8.

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For mowing grass during harvesting of hay or haylage, support-free mowers with rotary movement of knives are used mainly, the productivity of which is much greater than segment-finger mowers. Free-cutting cutting apparatuses with rotational movement of knives happen with their rotation around the vertical (rotary) and horizontal (rotary) axes. Mowers that are equipped with rotary cutting devices significantly grind grass, so they are used in mower-grinders and lawn mowers. The purpose of the work is to substantiate the methodology for calculating the structural and kinematic parameters of rota
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Liu, Yongmeng, Ruirui Li, Chuanzhi Sun, et al. "Research on Rotary Parts Vibration Suppression Based on Coaxiality Measurement and Unbalance Constraint." Applied Sciences 11, no. 12 (2021): 5747. http://dx.doi.org/10.3390/app11125747.

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To suppress the vibration of rotary parts, this paper established an unbalanced vibration response control model of rotary parts based on rotating axis coordinate system. This model considered the stacking transformation of geometric parameter errors and mass parameter errors of single stage rotor. First of all, the centroid transfer model based on the actual rotation axis was established, and the unbalanced excitation force vector of each stage of the rotor was studied. Secondly, the unbalanced excitation force vector of each stage of the rotor is substituted into the model of assembly vibrat
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Dissertations / Theses on the topic "Rotori"

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Negosanti, Tommaso. "Progetto meccanico di un elicottero a rotori sincronizzati." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Obiettivo di questo lavoro di tesi è progettare la trasmissione di un elicottero leggero a controllo remoto (very light peso<4kg) bi-motore a rotori sincroni ed allestire un banco prova necessario ad effettuare test sulla trasmissione, svolto interamente all’interno del laboratorio di meccanica del volo. Il progetto di trasmissione si è rivelato molto complesso, in quanto è necessario inclinare il moto prodotto dal motore elettrico lungo i due assi degli alberi rotorici. Partendo da un elicottero APR preesistente si sono utilizzati i dati caratteristici del veivolo ed alcuni componenti per r
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Gianni, C. "ABLAZIONE DEI ROTORI NELLA FIBRILLAZIONE ATRIALE NON PAROSSISTICA." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/332598.

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Background Focal impulse and rotor modulation (FIRM)-guided ablation targets sites that are thought to sustain atrial fibrillation (AF). Objective We sought to evaluate the acute and mid-term outcomes of rotors-only ablation in patients with non-paroxysmal AF. Methods We prospectively enrolled patients with persistent and long-standing persistent (LSP) AF to undergo FIRM-guided only ablation. We evaluated acute procedural success (defined as AF termination, organization or ≥10 % slowing), safety (incidence of peri-procedural complications) and success at follow-up (single-procedure freedo
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DE, FELICE ALESSANDRO. "Studio degli effetti giroscopici agenti su rotori sottoposti ad eccitazione parametrica periodica." Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2020. http://hdl.handle.net/11380/1200642.

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L’analisi dinamica di rotori flessibili adibiti alla trasmissione di potenza è un soggetto di ricerca di grande interesse nell’ambito della meccanica delle machine, attualmente incoraggiato dal crescente interesse verso applicazioni ad alta velocità di rotazione abbinata a più alte densità di potenza trasmesse. Gli effetti della spinta assiale e del momento torcente, rappresentanti condizioni di carica-mento comuni in ambito ingegneristico, sono stati studiati a lungo concentrando l’attenzione a problemi a carichi costanti. Tuttavia, più di recente, è stato considerato anche il caso di compone
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Di, Padova Michele. "Studio e ottimizzazione del profilo di rotori per pompa claw." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Questo elaborato si pone l’obiettivo di raggiungere una soluzione innovativa in merito alla realizzazione dei profili dei rotori di una pompa a vuoto di tipo claw. È una pompa volumetrica con compressione interna, in cui lo spostamento del fluido dall'ingresso all'uscita è ottenuto per mezzo di una coppia di rotori a forma di doppio uncino che ruotano in direzione opposta. È una macchina dall'elevato rendimento, robusta e che non necessita di lubrificazione (tranne che per gli ingranaggi, ma non è richiesta l’apertura della pompa per il rabbocco dell’olio) e per questo permette di ridurre al m
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Babbi, Giulia. "Studio preliminare delle prestazioni di un elicottero a rotori sincronizzati." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Il progetto preso in esame in questa tesi è un elicottero a rotori sincronizzati; lo scopo è determinare le prestazioni, in termini di potenza necessaria al volo, attraverso l'elaborazione di un modello matematico implementato in ambiente Matlab, di una sua riproduzione in scala ridotta alimentata da motore elettrico. Questo particolare tipo di configurazione non ha il rotore di coda ed ha alta stabilità; tuttavia la caratteristica di avere rotori inclinati dà luogo a forze aerodinamiche di portanza aventi un'angolazione pari a quella dei rotori e ciò causa una riduzione di efficienza totale
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Perra, Uto. "Progetto meccanico di un elicottero a rotori sincronizzati pilotato da remoto." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Questa tesi nasce dal desiderio di studiare e realizzare un progetto di trasmissione del moto su di un elicottero leggero a controllo remoto con rotori intersecantisi. In fase preliminare si è partiti raccogliendo i dati caratteristici ed alcuni componenti dell'elicottero Goblin 500, prodotto da Sab, per facilitare il lavoro di progettazione. L’opera è frutto di un importante lavoro di ricerca nel campo delle costruzioni di macchine, in particolare di trasmissione con cinghie e ruote dentate. Il lavoro presentato è volto al confronto con altri tipi di trasmissioni, studiandone l'affidabil
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Cacchi, Alberto. "Analisi di sensibilità per la valutazione di driver aritmici con catetere ad alta risoluzione." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22987/.

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La Fibrillazione Atriale è il tipo di aritmia cardiaca più comune, ed è caratterizzata da un’attivazione irregolare degli atri che perdono la capacità di contrarsi in maniera coordinata. Nonostante i grandi sforzi della comunità scientifica per migliorare l'efficacia delle terapie sulla FA, esse rimangono non ottimali poiché i meccanismi di mantenimento della patologia non sono identificati con chiarezza. In, particolare viene presentata la teoria dei rotori, come principali meccanismi di innesco e mantenimento della FA. In questo lavoro di tesi è stato implementato un sistema che analizza i
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Romagnoli, Matteo. "Sviluppo e integrazione in ambiente di simulazione di modelli tridimensionali per la rappresentazione grafica della dinamica di velivoli ad ala rotante." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Sin dallo sviluppo dei primi velivoli in grande scala si è evidenziata la necessità di poter usufruire di modelli matematici e di simulazione dinamica che potessero restituire stime affidabili del comportamento che i prototipi sottoposti ai test avrebbero potuto presentare in volo. La capacità di poter prevedere i comportamenti che i velivoli sviluppano in contesti operativi si rivela la soluzione vincente per risparmiare denaro e per poter identificare tutte quelle manovre che possono costituire un pericolo, sia per quanto riguarda problemi di carattere aeroelastico e strutturale, sia, di co
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Lozupone, Graziano Vito. "Elaborazione automatica di segnali intracardiaci per la rilevazione di rotori elettrici sottostanti la fibrillazione atriale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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La fibrillazione atriale (FA) è la più frequente tra le aritmie. In questo lavoro è stata studiata la teoria dei rotori che si ipotizza sostenga la FA. Sono stati utilizzati elettrogrammi (EGM) provenienti da 8 pazienti con FA persistente, ottenuti con elettrocatetere ad alta densità: 20 elettrodi in 7cm^2. È stato realizzato un sistema automatico che permette di rilevare numero, durata e collocazione dei rotori trovati. I segnali esportati dal sistema hanno subito un processo di selezione secondo vincoli imposti sul contatto degli elettrodi e sulla stabilità durante l’acquisizione. Il segnale
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Andriulli, Raoul. "Validazione sperimentale di modelli di sistemi propulsivi per veicoli multi-rotore." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Studio sperimentale inerente all'effetto dell'impiego di configurazioni a rotori coassiali sulle prestazioni di motori elettrici brushless per droni multi-rotore. La prima parte dell’attività è stata la caratterizzazione completa di un singolo rotore da 15 pollici (i.e. spinta, coppia, figura di merito...) al variare della manetta. Successivamente è stato, invece, analizzato il funzionamento della stessa elica accoppiata ad una gemella in un sistema controrotante, valutandone la variazione dei parametri in funzione della distanza tra i due dischi attuatori.
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Books on the topic "Rotori"

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Brooks, Thomas F. Helicopter main-rotor noise: Determination of source contributions using scaled model data. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Brooks, Thomas F. Helicopter main-rotor noise: Determination of source contributions using scaled model data. Langley Research Center, 1988.

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Ralph, Jolly J., Marcolini Michael A, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Helicopter main-rotor noise: Determination of source contributions using scaled model data. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Brooks, Thomas F. Helicopter main-rotor noise: Determination of source contributions using scaled model data. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Wilbur, Matthew L. Development of a rotor-body coupled analysis for an active mount aeroelastic rotor testbed. National Aeronautics and Space Administration, Langley Research Center, 1998.

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Center, Langley Research, ed. Development of a rotor-body coupled analysis for an active mount aeroelastic rotor testbed. National Aeronautics and Space Administration, Langley Research Center, 1998.

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Center, Langley Research, ed. Development of a rotor-body coupled analysis for an active mount aeroelastic rotor testbed. National Aeronautics and Space Administration, Langley Research Center, 1998.

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Center, Langley Research, ed. Development of a rotor-body coupled analysis for an active mount aeroelastic rotor testbed. National Aeronautics and Space Administration, Langley Research Center, 1998.

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Center, Langley Research, ed. Development of a rotor-body coupled analysis for an active mount aeroelastic rotor testbed. National Aeronautics and Space Administration, Langley Research Center, 1998.

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Coleman, Colin P. A survey of theoretical and experimental coaxial rotor aerodynamic research. National Aeronautics and Space Administration, 1997.

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Book chapters on the topic "Rotori"

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Daher, Georges, Stéphane Régnier, and Sinan Haliyo. "A Rotary Induction Actuator for Kinesthetic and Tactile Rendering." In Haptics: Science, Technology, Applications. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06249-0_18.

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AbstractActuators with low inertia and high bandwidth are of great interest for haptic devices, as they improve the quality of force rendering and transparency. This paper describes, as a proof of concept, a new design in rotary induction motors, the Axial-DSIM (Axial Double-Sided Induction Motor). This motor has a simple design construction that consists of a thin and lightweight disc-shaped moving secondary (rotor) surrounded by fixed primaries on both sides that generate a rotating magnetic field that induces a force on the disc. The low inertia of this motor and its principle of operation make it possible to render high-fidelity torques with high dynamics.
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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Cracks in Rotating Shafts." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_1.

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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Typical Dynamic Behaviour of Cracked Shafts." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_2.

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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Rotor Testing for Crack Detection." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_3.

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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Laboratory Tests on Cracked Shafts." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_4.

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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Crack Modelling." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_5.

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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Results Obtained Using Simulations." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_6.

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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Some Special Effects Caused by Cracks." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_7.

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Bachschmid, Nicolò, Paolo Pennacchi, and Ezio Tanzi. "Crack Diagnosis in Rotating Shafts." In Cracked Rotors. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01485-7_8.

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Georghiou, Luke, J. Stanley Metcalfe, Michael Gibbons, Tim Ray, and Janet Evans. "Renold Power Transmission (Holroyd Machine Tools & Rotors): Rotor Milling Machines." In Post-Innovation Performance. Palgrave Macmillan UK, 1986. http://dx.doi.org/10.1007/978-1-349-07455-6_32.

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Conference papers on the topic "Rotori"

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Su, Shenjian, Liming Wang, Ping Li, and Jianli Zuo. "Similarity Design of Rotary Machine’s Bearing Parameters." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59774.

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The bearing parameters, which dominate the dynamic behavior of the rotary machine, should be optimized so that the machine can successfully pass through the critical speed and stably run at the operating speed. However, the parametric optimization usually needs complicated numerical calculation and a great deal of experimentation, especially for the high-speed vertical machine studied here, the dynamic behavior of which is even more sensitive to the parameters. Whereas, the new-style rotor is of similar structure with the old-style rotor. The difference between the two types of rotors is that
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Elkamchouchi, Hassan, and Ahmed M. Elshafee. "ROTRIX, The Arrayed Rotors System." In Proceedings of the Twenty Third National Radio Science Conference (NRSC'2006). IEEE, 2006. http://dx.doi.org/10.1109/nrsc.2006.386346.

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Gupta, K., R. Kumar, M. Tiwari, and O. Prakash. "Effect of Rotary Inertia and Gyroscopic Moments on Dynamics of Two Spool Aeroengine Rotor." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-045.

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The main objective of the paper is to study the effect of rotary inertia and gyroscopic moments due to lumped masses on the dynamics of two spool aeroengine rotors. Since the rotary inertia effect is well established, the thrust of the paper is on the effect of gyroscopic moments. Quantitative as well as qualitative aspects are studied. Effect of gyroscopics and rotary inertia on rotor critical speeds and unbalance response are studied for several rotors with particular reference to relative LP and HP rotor speeds. A two spool rig which resembles an actual aeroengine has been designed and buil
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Hong, Jie, Qi Yan, Bo Sun, and YanHong Ma. "Vibration Failure Analysis of Multi-Disk High-Speed Rotor Based on Rotary Inertia Load Model." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-83174.

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Abstract The fan rotor of an advanced low-bypass turbofan engine is usually composed of multistage blisk, a typical multi-disk highspeed rotor working in the postcritical range. A fan rotor test rig had been well balanced, but the phenomenon of excessive vibration occurred several times. This phenomenon showed that the traditional balance theory based on mass eccentricity control has limitations for multi-disk high-speed rotors. Therefore, an analysis model was established in this paper that described the rotor’s mass distribution and the rotary inertia load by two kinds of parameters: the ecc
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Yang, Yingchen. "Waves to Drive a Direct Rotor for Unidirectional Rotation." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64394.

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Ocean waves constitute a massive source of renewable energy. However, ocean wave energy is highly underutilized. In the present work, a new approach for wave energy harvesting is discussed. A direct-drive rotor is employed as a key component of a wave energy converter (WEC). The rotor absorbs wave energy and performs unidirectional rotary motion. This approach is in contrast to the overly dominant existing technologies that utilize wave-driven oscillation (either linear or angular, e.g., heave, surge or pitch) for energy conversion. It is also different from the very few existing technologies
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Marin, Manuel A. "Rotor Dynamics of Overhung Rotors: Hysteretic Dynamic Behavior." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68285.

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Overhung-configuration rotors are commonly used in the oil, gas and process industries. Examples of this type of equipment include power turbines, Fluid Catalytic Cracking (FCC) expanders, turbochargers and pipeline boosters. Generally, in overhung-configuration rotors, the mass concentration is near the bearing on the overhung end, so the rotor dynamics behavior of these overhung-configuration rotors is different than other equipments that have their mass concentrations between the bearing spans, such as multistage compressors. Among the more important characteristics that directly affect the
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Blaha, Christoph, Stephan Kablitz, Dietmar K. Hennecke, Uwe Schmidt-Eisenlohr, Klaus Pirker, and Susanne Haselhoff. "Numerical Investigation of the Flow in an Aft-Swept Transonic Compressor Rotor." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0490.

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The design of an aft-swept transonic compressor rotor and the investigation of its flow field compared to the radial baseline rotor are reported. Both rotors were designed using a 3D Euler solver with body forces. Through the choice of composite material using carbon fibres, high amounts of sweep and lean could be imparted to the blades without adding mass to the rotor assembly. No compromise between aerodynamic and structural constraints had to be made. The swept design as well as the radial base-line rotor were investigated using the commercial RANS solver CFX-TASCflow to validate the design
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Ibrahim, Ahmed, and Ahmed M. R. Elbaz. "Investigating Efficient Clusters of Savonius Wind Turbines." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75405.

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The wake effect is the biggest challenge when locating downwind turbines in wind farms which imposes large separation distances between turbines. In the present work, CFD simulations are presented to study possible configurations of wind farms of Savonius wind turbines. The farm is composed by in steps, starting from two-turbine configuration, adding one turbine until reaching a cluster of closely set ten rotors with an average power coefficient of 0.225. This value is very close to the single rotor’s power coefficient. The power density of the cluster is 7.55 W/m2 which is much higher than si
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Carroll, Tim, Issi-Rae E. George, and Goetz Bramesfeld. "Design Optimization of Small Rotors in Quad-Rotor Configuration." In 54th AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-1788.

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Chatterjee, Riju, Ashutosh Patel, Nirmal Kumar, and Pramod Kumar. "Semi-Analytical Model for High-Speed Rotor Whirl Prediction: An Assumed Modes Formulation for an Axisymmetric Rotor With Non-Uniform Properties." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82632.

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Abstract Most fully analytical treatments of rotor whirl are restricted to very simple rotor geometries, and have limited use while studying real-world rotors. Analysis of more complex rotors is routinely carried out in Finite Element software such as Ansys, but this is less effective at generating fundamental insights to inform the design process. This paper is motivated by the ongoing development of a Supercritical-CO2 turbine rotor, and illustrates a rotor model of intermediate complexity. Such a model, given the relative novelty of the turbine design task stemming from the very high rotati
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Reports on the topic "Rotori"

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Zheng, Wanzheng, and Jason Merret. Aerodynamic Survey of Novel eVTOL Configuration Using SU2. Illinois Center for Transportation, 2022. http://dx.doi.org/10.36501/0197-9191/22-014.

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This report summarizes computational fluid dynamics (CFD) results of electric vertical takeoff and landing (eVTOL) geometries using the SU2 Reynolds-averaged Navier-Stokes (RANS) solver. Geometries were generated based on the Smart Transportation Infrastructure Initiative (STII) Rappor 15th iteration with various rotor-installment solutions. It was found that although open rotors installed on an underwing pylon were superior to shrouded rotors installed in a canoe, the canoe configuration would provide more potential for improvement, and using a canoe door to cover the first rotor opening woul
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Wenren, Yonghu, Joon Lim, Luke Allen, Robert Haehnel, and Ian Dettwiler. Helicopter rotor blade planform optimization using parametric design and multi-objective genetic algorithm. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/46261.

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In this paper, an automated framework is presented to perform helicopter rotor blade planform optimization. This framework contains three elements, Dakota, ParBlade, and RCAS. These elements are integrated into an environment control tool, Galaxy Simulation Builder, which is used to carry out the optimization. The main objective of this work is to conduct rotor performance design optimizations for forward flight and hover. The blade design variables manipulated by ParBlade are twist, sweep, and anhedral. The multi-objective genetic algorithm method is used in this study to search for the optim
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Allen, Luke, Joon Lim, Robert Haehnel, and Ian Dettwiller. Helicopter rotor blade multiple-section optimization with performance. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41031.

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This paper presents advancements in a surrogate-based, rotor blade design optimization framework for improved helicopter performance. The framework builds on previous successes by allowing multiple airfoil sections to designed simultaneously to minimize required rotor power in multiple flight conditions. Rotor power in hover and forward flight, at advance ratio 𝜇 = 0.3, are used as objective functions in a multi-objective genetic algorithm. The framework is constructed using Galaxy Simulation Builder with optimization provided through integration with Dakota. Three independent airfoil sections
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Branson, Roger. Advanced Distributed Simulation Technology Advanced Rotary Wing Aircraft. Study Comparing Approaches to Modeling the ARWA Main Rotor. Defense Technical Information Center, 1994. http://dx.doi.org/10.21236/ada280824.

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Allen, Luke, Joon Lim, Robert Haehnel, and Ian Detwiller. Rotor blade design framework for airfoil shape optimization with performance considerations. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41037.

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A framework for optimizing rotor blade airfoil shape is presented. The framework uses two digital workflows created within the Galaxy Simulation Builder (GSB) software package. The first is a workflow enabling the automated creation of a surrogate model for predicting airfoil performance coefficients. An accurate surrogate model for the rapid generation of airfoil coefficient tables has been developed using linear interpolation techniques that is based on C81Gen and ARC2D CFD codes. The second workflow defines the rotor blade optimization problem using GSB and the Dakota numerical optimization
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Fries, Joseph. The Effect of Helicopter Main Rotor Blade Damage on the Rotor Disk (Whole Rotor) Motion. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada378211.

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Pogorzelski, Ronald J., and Vaughn P. Cable. Helicopter Rotor Antenna. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada395307.

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Kolwey, Herman. Tail Rotor Flapping. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada375758.

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ARMY WAR COLL CARLISLE BARRACKS PA. Aircraft Rotor Surface Coating Qualification Testing Aircraft Rotor Surface Coating. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada481301.

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Johnson, Nicholas, Pietro Bortolotti, Katherine L. Dykes, et al. Investigation of Innovative Rotor Concepts for the Big Adaptive Rotor Project. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1563139.

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