Relevant bibliographies by topics / ROTOR DISCS

Academic literature on the topic 'ROTOR DISCS'

Author: Grafiati
Published: 11 September 2023

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Journal articles on the topic "ROTOR DISCS"

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Parish, D., and D. G. MacManus. "Aerodynamic investigations of ventilated brake discs." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 219, no. 4 (April 1, 2005): 471–86. http://dx.doi.org/10.1243/095440705x11121.

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The heat dissipation and performance of a ventilated brake disc strongly depends on the aerodynamic characteristics of the flow through the rotor passages. The aim of this investigation was to provide an improved understanding of ventilated brake rotor flow phenomena, with a view to improving heat dissipation, as well as providing a measurement data set for validation of computational fluid dynamics methods. The flow fields at the exit of four different brake rotor geometries, rotated in free air, were measured using a five-hole pressure probe and a hot-wire anemometry system. The principal measurements were taken using two-component hot-wire techniques and were used to determine mean and unsteady flow characteristics at the exit of the brake rotors. Using phase-locked data processing, it was possible to reveal the spatial and temporal flow variation within individual rotor passages. The effects of disc geometry and rotational speed on the mean flow, passage turbulence intensity, and mass flow were determined. The rotor exit jet and wake flow were clearly observed as characterized by the passage geometry as well as definite regions of high and low turbulence. The aerodynamic flow characteristics were found to be reasonably independent of rotational speed but highly dependent upon rotor geometry.
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Wang, Aiming, Yujie Bi, Yu Feng, Jie Yang, Xiaohan Cheng, and Guoying Meng. "Continuous Rotor Dynamics of Multi-Disc and Multi-Span Rotors: A Theoretical and Numerical Investigation of the Identification of Rotor Unbalance from Unbalance Responses." Applied Sciences 12, no. 8 (April 11, 2022): 3865. http://dx.doi.org/10.3390/app12083865.

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Rotor unbalance identification plays a critical role in balancing rotors. In this paper, concerned with multi-disc and multi-span rotor-bearing systems, two novel algorithms called the Single Direction Algorithm (SDA) and the Two Orthogonal Direction Algorithm (TODA) are proposed for identifying rotor unbalance from unbalance responses. A matrix method is proposed to solve the problem of the equations being non-linear transcendental, there being too many unknown variables in the equations, and rotor unbalances and bearing coefficients being coupled together. The unbalance responses at all the eccentric discs are necessary for identifying their unbalances. Numerical simulations are conducted to validate the proposed methods. Moreover, an adjustment point is found, and a proper sensor resolution is suggested to achieve high identification accuracy by means of numerical studies. In addition, the identification accuracy of SDA is better than TODA, and SDA is more practical and suitable for medium-speed and high-speed rotors. The proposed algorithms have the flexibility to incorporate any number of bearings and discs and provide a technique for monitoring rotor unbalance without test runs or external exciters.
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Wen, Chuanmei, Yuqi Li, Long Jin, and Dayong Yang. "Bifurcation and Stability Analysis of a Bolted Joint Rotor System Contains Multi-Discs Subjected to Rub-Impact Effect." Processes 10, no. 9 (September 2, 2022): 1763. http://dx.doi.org/10.3390/pr10091763.

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In aero-engines, the rotor systems are frequently designed with multistage discs, in which the discs are fastened together through bolted joints. During operation, rotating machines are susceptible to rotor–stator rubbing faults. Those bolted joints are subjected to friction and impact forces during a rubbing event, leading to a dramatic change in mechanical properties at the contacting interfaces, influencing the rotor dynamics, which have attracted the attention of scholars. In the present work, a mathematical model, which considers the unbalance force, rotor dimensional properties, nonlinear oil-film force and rub-impact effect, is developed to study the bifurcation and stability characteristics of the bolted joint rotor system containing multi-discs subjected to the rub-impact effect. The time-domain waveforms of the system are obtained numerically by using the Runge–Kutta method, and a bifurcation diagram, time domain waveforms, spectrum plots, shaft orbits and Poincaré maps are adopted to reveal the rotor dynamics under the effect of the rub-impact. Additionally, the influences of rubbing position at the multi-discs on rotor dynamic properties are also examined through bifurcation diagrams. The numerical simulation results show that the segments of the rotating speeds for rubbing are wider and more numerous, and the middle disc is subjected to the rub-impact. When the rub-impact position is far away from disc 1, the rubbing force has little effect on the response of disc 1. The corresponding results can help to understand the bifurcation characteristics of a bolted joint rotor system containing multi-discs subjected to the rub-impact effect.
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Jweeg, Mohsin Juber, Mahmud Rasheed Ismail, and Zainab Mohammed Hwady Hwady. "Theoritical and Experimental Investigation of the Dynamical Behaviour of Complex Configuration Rotors." Journal of Engineering 20, no. 2 (May 18, 2023): 106–17. http://dx.doi.org/10.31026/j.eng.2014.02.08.

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The present work considers an alternative solution for a complex configuration of rotor discs by applying Galerkin Method. The theoretical model consists of elastic shaft carrying number of discs and supported on number of journal bearings. The equation of motion was discretized to finite degree of freedom in terms of the system generalized coordinates. The various effects of the dynamical forces and moments arising from the bearing, discs and shaft were included. Rayleigh beam model is used for analyzing the shaft while the discs are considered rigid . The validity and convergence of the present analysis was carefully checked by comparing with the Finite Element solution. An example of rotor consists of three different size discs and supported by two journal bearing was considered for the numerical solution .The results shows good agreements between the two methods ,where the maximum error not exceeds 5%. The convergence test showed that using few modes (not more than 6) are sufficient for the accurate analysis. The forward and backward whirl was investigated experimentally .The experimental results of a two discs rotor ,show a reasonable agreement where the maximum error not exceeds 11%. The unbalance response, Cambpell diagram, orbit response were plotted .The effects of geometry, disc sizes , location and arrangement on the unbalance response and natural frequencies of three discs rotor were further investigated .
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Zhang, Song He, Yue Gang Luo, Bin Wu, and Bang Chun Wen. "Dynamic Behavior Analysis of Three-Span Rotor-Bearing System with Rub-Impact Fault." Advanced Materials Research 460 (February 2012): 160–64. http://dx.doi.org/10.4028/www.scientific.net/amr.460.160.

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The dynamic model of the three-span rotor-bearing system with rub-impact fault was set up. The influence to nonlinear dynamics behaviors of the rotor-bearing system that induced by rub-impact of one disc, two discs and three discs were numerically studied. The main influence of the rotor system response by the rub-impact faults are in the supercritical rotate speed. There are mutations of amplitudes in the responses of second and third spans in supercritical rotate speed when rub-impact with one disc, and there are chaotic windows in the response of first span, and jumping changes in second and third spans when rub-impact with two or three discs.
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Prihatmoko, Pebri, F. Danang Wijaya, and Suharyanto Suharyanto. "STUDI PENGARUH JARI-JARI DALAM MAGNET TERHADAP TEGANGAN GENERATOR AKSIAL PADA BAHAN CAKRAM AKRILIK." Jurnal Teknosains 8, no. 2 (January 31, 2019): 105. http://dx.doi.org/10.22146/teknosains.30958.

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The high cost of making rotor discs is one aspect that becomes an obstacle in the implementation of axial generator research. This study aims to compare acrylic discs with wooden discs in terms of axial generator output voltage and production costs, so that further research can use alternative discs with lower cost. This study uses an experimental method, where this method is used to find existing variables. On a generator with an acrylic disc, the average voltage is 16.6 volts with a manufacturing cost of 151,500 rupiah. Whereas on generator with wood disc, the average voltage is 17.2 volts with a manufacturing cost of 48,750 rupiah. Thus wood disc can be an alternative material in making cheap axial generator rotor discs.
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Behzad, M., and M. Asayesh. "Numerical and experimental investigation of the vibration of rotors with loose discs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 1 (August 11, 2009): 85–94. http://dx.doi.org/10.1243/09544062jmes1345.

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In this study, the energy method has been used to develop a finite-element code for studying the effects of loose rotating discs on the rotor—bearing systems’ response. A mathematical model of the loose disc has resulted in terms similar to unbalance and gyroscopic effects in the equation of motion of the system. Results of this study show that rotor response and beating phenomena are a function of measurement location, loose disc mass and inertia, ratio of rotating speed to the speed of loose disc, and clearance between the loose disc and shaft considering constant speed for loose disc and shaft. The developed finite-element model can numerically give the response of rotors with any number of loose discs at any location with isotropic or orthotropic supports. Results of numerical calculation have been verified by experimental tests.
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Li, M., and L. He. "The dynamics of a parallel-misaligned and unbalanced rotor system under the action of non-linear oil film forces." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 9 (September 1, 2010): 1875–89. http://dx.doi.org/10.1243/09544062jmes1916.

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A mathematical model of a parallel-misaligned rotor system with mass eccentricity that is supported on journal bearings is discussed and its dynamic behaviours are analysed under the action of non-linear oil forces in the present work. First, some assumptions are introduced, such as the long bearing model, small parallel misalignment between rotors and tiny eccentricity of discs, the misaligned displacement constraint between two rotors is taken into account, and the motion equations are deduced by the Lagrange method of undetermined multiplier. Then, the rotor orbits, Poincaré maps, and bifurcation diagrams of the system are studied by a numerical method; the results show that there exists some unrevealed motions and phenomena in the parallel-misaligned and unbalanced rotor system such as period 2, 3, 6, and 7 motions besides chaotic oscillations and so on.
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Han, Qing Kai, Tao Yu, He Li, Zhao Ye Qin, Zhi Wei Zhang, and Bang Chun Wen. "Hybrid Model Based Identification of Local Rubbing Fault in Rotor Systems." Key Engineering Materials 293-294 (September 2005): 355–64. http://dx.doi.org/10.4028/www.scientific.net/kem.293-294.355.

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A quantitative identification procedure for local rubbing fault in rotor systems based on a hybrid model is proposed. The hybrid model combines finite element model of rotor and rigid discs, online identified oil film stiffness and elastic supports. The identification algorithm of oil film parameters is stated in detail. The hybrid model based diagnosis process for local rubbing fault is described with assumption of periodic rubbing forces. With the help of modal expansion technique, the estimated rubbing forces at each node along rotor are checked for the rubbing position. The estimated rubbing forces at ascertained position are then used in fault severity assessing quantitatively next. These approaches have been tested successfully on a test rig with single rotor double discs.
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Han, Q., Z. Zhang, and B. Wen. "Periodic motions of a dual-disc rotor system with rub-impact at fixed limiter." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 10 (October 1, 2008): 1935–46. http://dx.doi.org/10.1243/09544062jmes947.

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Periodic motions of a rotor system with two discs are investigated where rub-impacts occur at fixed limiter for a test rig with dual discs. First, a finite element (FE) model of the rotor system is developed. Then numerical simulations based on the FE model are conducted to study the rotor transverse vibrations of the rotor system under three typical cases with different rotating speeds, rub-impact clearances, rub-impact rod stiffness, and rub frictions. The results are further compared with typical multiperiodic characteristics by experimentally measured vibrations. The simulations demonstrate different rotor motions, including periodic, quasi-periodic or complex characteristics, which coincide with experimental measurements. Finally, the non-stationary time-frequency domain characteristics of rub-impact motions are investigated via the Hilbert—Huang transform, and intrinsic mode functions (IMFs) and instantaneous frequencies of the three typical cases are obtained. The research has revealed some of the inherent vibration features of the dual-disc rotor system with rub-impact only occurring at fixed limiters.
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Dissertations / Theses on the topic "ROTOR DISCS"

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Wallis, Lisa M. Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "A comparison of bi-directional disc brake rotor passage designs." Awarded by:University of New South Wales. School of Mechanical & Manufacturing Engineering, 2003. http://handle.unsw.edu.au/1959.4/20312.

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An important part of automobile safety is the braking system. Disc brakes have been widely used in automobiles for sped retardation for over 30 years. During that time, they have developed from a simple disc to a complex disc with channels, vanes, holes and grooves. The stopping capability of disc brakes is affected by the rate at which heat is dissipated by forced convection and the thermal capacity of the rotor. Catastrophic failure of brake rotors can occur during rapid increases or decreases in rotor temperature where regions of high temperature gradients result in high thermal strains. There is little information in the public domain regarding the relative merits of different disc brake rotor geometries, particularly in terms of airflow patterns, heat transfer rates, and internal thermal gradients. The aim of this research project was to investigate how geometrical variations affect the thermal performance of bi-directional disc brake rotors, particularly for high performance applications. Dynamometer testing showed that respectable increases in braking performance are achievable with relatively simple machining modifications. Tuft and smoke visualization techniques provided a preliminary understanding of the airflow in the passages of three distinct bi-directional rotor designs. Particle Image Velocimetry was used for detailed flow measurements which supported the numerical simulations. Computational Fluid Dynamics was used to predict the airflow and heat transfer associated with eight bi-directional brake rotor designs. The results show that 'pillared' passage designs can achieve higher heat transfer rates than traditional straight radial vane designs and that the heat loss from pillared rotors is generally more uniform than from vaned rotors. Subsequent conjugate heat transfer simulations found that temperature gradients inside pillared rotors are typically lower than inside vaned rotors. Thus failure rates due to excessive thermal strain are expected to be lower for pillared rotors. It was shown that rotor selection based solely on heat transfer rates is inappropriate and different passage designs are suited to different applications. The findings of this research will directly benefit local disc brake manufacturers, who do not have resources to conduct thorough studies comparing the thermal characteristics of different brake rotor designs.
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Graf, Aaron John. "Active control of automotive disc bake rotor squeal using dither." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16933.

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Hussain, Jafar. "Thermal and material characterisation of coated lightweight disc brake rotor." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/21609/.

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Environmental concerns linked to CO2 emissions have placed the automotive industry under considerable pressure to reduce the carbon footprint of the vehicles that they produce. One way forward involves the use of alternative lightweight materials. The use of aluminium alloy in a brake rotor has the potential to save around 20kg in unsprung mass on a medium sized passenger car. A full scale prototype lightweight coated ventilated aluminium alloy (6082) brake rotor was manufactured to investigate the thermal performance under drag brake test conditions. The brake rotor’s rubbing surface was coated with alumina layer using a plasma electrolytic oxidation (PEO) process. The ventilated brake rotor geometry contributes to the ability of the structure to dissipate heat through the inclusion of an array of appropriately configured vents and so has further bearing on the ability of the rotor to run cool. It is also feasible to explore the impact of vane design on the cooling of the rotor since the vented section of the rotor can be easily reconfigured using the current prototype. Experiments were conducted using a brake dynamometer. Brake rotor rubbing surface temperature, hydraulic pressure, rotational speed and brake torque were monitored during the test. The coefficient of friction was found to be around 0.5. Abaqus software was used to generate a three dimensional finite element model of a section of the coated brake rotor. The simulation results were found to be in good agreement with the experimental results when a heat transfer coefficient of 30 W/m2K was specified on all free surfaces. It was shown that coating thickness has a minimum effect on the substrate temperature. In parallel, a wear analysis has also been carried out using a pin-on-disc experimental setup. The mass of the friction material and the small discs were measured before and after the test. The wear coefficient for both conventional grey cast iron (GCI) and coated aluminium alloy were also measured and compared. It was found that wear rate of the PEO coated disc is about 15 times lower than the GCI. The wear rate of the friction material when run against the PEO coating was about 5 times less than when the same material was run against cast iron, even though the friction coefficient was on average higher (0.6 of 0.5).
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Perdikologos, Nikolaos Carleton University Dissertation Engineering Mechanical. "Dynamic analysis of flexible disc-rotor systems using component modes." Ottawa, 1985.

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Carter, Jace A. "EFFECT OF MATERIAL ANOMALIES ON FATIGUE LIFE OF TURBINE DISKS." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1316211638.

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Arzpeima, Minoo. "CFD Investigation of Flow Structures in Rotor-Stator Disc Cavity Systems." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153733.

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Parras, Blázquez Pedro Santiago. "CFD Analysis of Pressure Instabilities in Stator-Rotor Disc Cavity Systems." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140904.

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The continuous demand to improve turbine performance has led manufactures to focus on aspects that have been previously considered of secondary importance such as the secondary air system. The purpose of this system is to cool the components and prevent ingestion of hot gas into the stator-rotor cavity that could lead to low frequency pressure fluctuations called Cavity Flow Instabilities. These instabilities could cause unpredictable rotor vibrations and damage several components. A CFD method capable of detecting cavity flow instabilities in a rotor-stator disk cavity system is investigated, based on the 360◦model of the cavity without anystator vanes and rotor blades. Boundary conditions are simplified by considering steady and uniform flow in the main gas path. Different turbulence models are tested such as Realizable k−ε,k−ω SST, DDES, and SAS. In order to test the performance of the method, different purge flow levels are simulated. The most successful results, are predicted by the Realizable k−ε turbulence model. This model predicts two rotating low pressure structures in the cavity, for low purge flow levels. These pressure structures rotate at approximately 80% of the rotor speed. Furthermore, the spectra analysis of the pressure shows a reasonable agreement with the experimental results in terms of the frequency, showing a distinct region of low frequencies pressure instabilities. Nonetheless, this method overpredicts the amplitudes by a factor of 3-7 depending on the frequency. In addition, regions of one order of magnitude higher in frequency is also predicted. The DDES model shows similar findings but the amplitudes in the pressure spectra associated to the low frequencies are lower. Additionally, SAS also predicts the pressure in-stabilities but, in this case, the amplitudes are closer to RANS simulations, yet the high frequencies disappear. Unfortunately, k−ω SST, did not predict these pressure instabilities. Further research is still needed in many of the aspects of this work, from the simplifications up to the turbulence models. However, it is concluded from this work that this method could be a useful tool for turbine design as it decreases the need for testing and prototype manufacturing.
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Amann, Christian [Verfasser], and P. [Akademischer Betreuer] Gumbsch. "Probabilistic Fracture Mechanics of Forged Rotor Disks / Christian Amann ; Betreuer: P. Gumbsch." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1139360337/34.

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Linder, Johan. "An integrated brake disc and electric drive for vehicle propulsion : A FEASIBILITY STUDY." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187652.

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In this thesis, the feasibility to integrate an brake disc and electric machine is investigated. In wheel motors (IWMs) have several advantages, such as saving space in the vehicle, individual and direct control at the wheels and the absence of a mechanical transmission. However, today’s IWMs are heavy and, thus, negatively affect the driving performance of the vehicle due to the increase of the unsprung mass. By integrating an already existing part in the wheel, this increase of the unsprung mass can be minimized. The brake disc manages high temperatures, a significant wear in rough environ-ment, which puts high demands on the rotor. The second part of the machine, the stator, will be significantly affected by the high temperatures of the rotor. The temperatures of the stator are transferred by convection, conduction and radiation from the rotor or brake disc. Liquid cooling of the stator back is analyzed as a potential solution for handling the high temperatures. In order to analyze the feasibility of the concept, thermal, electric and mechanical modelling has been used. The evaluation whether it is possible or not to integrate the brake disc has been with regard to the results of weight, cost, thermal tolerance and electric performance.
I detta arbete undersöks möjligheten att integrera en bromsskiva med elmaskin. Hjul-motorer har flera fördelar, bland annat sparas utrymme i själva bilen, individuell kontroll samt drivning av hjulen utan mekaniska transmissioner. Men hjulmotorer som kan användas idag väger oftast så pass mycket att den odämpade massan ökar kritiskt och köregenskaper av fordonet då blir lidande. Genom att integrera en befintlig del i hjulet kan ¨okningen av odämpade massan minskas. Att använda bromsskivan som rotor, kräver att denna tål temperaturer ¨over 500◦C samt påfrestningar och slitage som en vanlig mekanisk friktionsbroms måste uthärda. Den andra delen av maskinen, statorn kommer även denna att påverkas av de höga temperaturerna av bromsskivan som kommer ledas via konvektion, konduktion och strålning. Möjligheten att kyla statorn med vätska och om detta är tillräckligt undersöks. För att analyserna genomförbarheten av projektet har termiska, elektriska och mekaniska modeller använts. Resultaten har analyserats där maskinens vikt, kostnad, termisk tålighet och elektrisk prestanda har legat till grund för bedömningen om lösningen; att integrera en broms-skiva med elmaskin är rimlig eller ej.
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Mitchell, Robert John. "Development of a new powder processed Ni-base superalloy for rotor disc application." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614731.

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Books on the topic "ROTOR DISCS"

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V, Nagpal, Chamis C. C, and United States. National Aeronautics and Space Administration., eds. Probabilistic analysis of bladed turbine disks and the effect of mistuning. [Washington, D.C: National Aeronautics and Space Administration, 1990.

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G. A. M. van Kuik. Fluid Dynamic Basis for Actuator Disc and Rotor Theories: Revised Second Edition. IOS Press, Incorporated, 2022.

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G. A. M. van Kuik. Fluid Dynamic Basis for Actuator Disc and Rotor Theories: Revised Second Edition. IOS Press, Incorporated, 2022.

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The 2006-2011 World Outlook for New Motor Vehicle Brake Rotors-Discs Sold Separately with or without Hub. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for New Motor Vehicle Brake Rotors-Discs Sold Separately with or without Hub. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for New Motor Vehicle Disc Brake Caliper Assemblies, Rotors, Calipers, Pads, and Cylinders Sold Together Excluding Asbestos Pads. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for New Motor Vehicle Disc Brake Caliper Assemblies, Rotors, Calipers, Pads, and Cylinders Sold Together Excluding Asbestos Pads. ICON Group International, Inc., 2006.

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Book chapters on the topic "ROTOR DISCS"

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Gupta, K., S. P. Singh, V. Tiwari, Savi Takkar, Rahul Dev, and Anant Rai. "Vibration Analysis of Fiber Reinforced Composite Discs." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 1665–75. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_137.

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Ewins, D. J., and Y. J. Chan. "Vibration of Rotating Bladed Discs: Mistuning, Coriolis, and Robust Design." In IUTAM Symposium on Emerging Trends in Rotor Dynamics, 163–75. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0020-8_15.

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Rzadkowski, Romuald, Artur Maurin, and Ryszard Szczepanik. "Forced Vibration of Eight Mistuned Bladed Discs on a Solid Shaft—Excitation of the Second Compressor Bladed Disc." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 89–100. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_8.

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Brandt, Jesper, Lars Kahlman, Robert Pompe, and Karl-Erik Lindblad. "Manufacturing of Ceramic Valve Discs and their Use in a Rotor CAM Engine." In 4th International Symposium on Ceramic Materials and Components for Engines, 1093–100. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2882-7_122.

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Kumar, Prabhat, Maruvada Sanket, Suyash Srivastav, and Tanmay Dinesh Madav. "Vibrational Nature of an Unbalanced Rigid Rotor System with Three Discs Secured by Two Active Magnetic Bearings." In Springer Proceedings in Materials, 335–45. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3844-5_35.

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Krämer, Erwin. "Shaft with Central Disc." In Dynamics of Rotors and Foundations, 19–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_3.

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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, 155–63. Cham: 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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Krämer, Erwin. "Shaft with Non Central Disc." In Dynamics of Rotors and Foundations, 37–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_4.

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Chauhan, Manish Kumar, Animesh Garg, Aditya Syal, and Manmeet Singh. "Testing of Material for Disc Brake Rotor." In Advances in Engineering Materials, 397–406. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6029-7_37.

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Mahmoodi, Esmail, and Alois Peter Schaffarczyk. "Actuator Disc Modeling of the MEXICO Rotor Experiment." In Research Topics in Wind Energy, 29–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54696-9_5.

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Conference papers on the topic "ROTOR DISCS"

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Rzadkowski, Romuald, and Artur Maurin. "Multistage Coupling of Mistuned Aircraft Engine Bladed Discs in a Forced Vibration Analysis." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26108.

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Considered here is the effect of multistage coupling on the dynamics of an aircraft engine rotor with eight mistuned bladed discs on a drum-disc shaft. Each disc had a different number of rotor blades. Free and forced vibrations were examined using finite element models of single rotating blades, bladed discs, and an entire rotor. Calculations of the global rotating mode shapes of flexible mistuned bladed discs-shaft assemblies took into account the excitation of the turbine bladed disc with 0EO, 1EO and 2EO forces. The thus obtained maximal stress values of all of the rotor blades were carefully examined and compared with a tuned system to discover resonance conditions and coupling effects. Mistuning changes the stress distribution in individual rotor blades and the level of maximum stress increases or decreases as compared to bladed discs which are analyzed without the shaft.
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Swaminathan, V. P. (Swami), Gil J. Dean, and John R. Scheibel. "Integrated Approach to Gas Turbine Rotor Condition Assessment and Life Management." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69103.

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Turbine manufacturers place limits on the service life of gas turbine (GT) rotors/discs based on either the number of hours of operation or the number of start-stop cycles. A significant number of gas turbine rotors are either condemned or slated for replacement during a future outage. Some turbines experience premature cracking which results in the replacement of select rotor components. Examples of such cases are GE Frame 7EA compressor disc cracking, Frame 7FA/9FA turbine disc air-feed slot and post cracking, and Frame 6001B turbine disc rabbet cracking Many Alstom 11N and Siemens W-501 rotors and discs are also replaced based on design life limitations. This experience prompted EPRI, sponsored by gas turbine owners to conduct projects in this area. Under this program, TurboMet International and AccTTech,LLC conducted metallurgical evaluation of cracked discs to understand the crack initiation and propagation mechanisms, detailed structural engineering analysis to understand the root cause of cracking and developed solutions; and to provide recommendations to turbine owners to mitigate such failures. Condition and remaining life analysis of several turbine models was conducted using rigorous engineering analysis to provide objective technical recommendations to turbine users to safely extend the life of the rotors. This collective experience has result in guidelines for safe reinspection intervals to mitigate future risk. In order to obtain pertinent material properties needed for such detailed engineering analysis, retired rotors and discs were obtained from both compressor and turbine sections. Nondestructive examinations (NDE) and materials testing were conducted to assess component condition and mechanical properties such as tensile, fracture toughness, crack growth, creep, low-cycle fatigue, etc. This paper provides an overview of an integrated rotor condition and life assessment approach including several examples of component evaluations.
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Rza˛dkowski, Romuald, and Marcin Drewczynski. "Multistage Coupling of Eight Bladed Discs on a Solid Shaft." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22803.

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Considered here is the effect of multistage coupling on the dynamics of a rotor consisting of eight bladed discs on a solid shaft. Each bladed disc had a different number of rotor blades. Free vibrations were examined using finite element representations of rotating single blades, bladed discs, and the entire rotor. In this study, the global rotating mode shapes of flexible tuned bladed discs-shaft assemblies were calculated, taking into account rotational effects, such as centrifugal stiffening. The thus obtained natural frequencies of the blade, the shaft, the bladed disc, and the entire shaft with discs were carefully examined to discover resonance conditions and coupling effects. This study found that the flexible modes of the tuned bladed discs affected by shaft motion were those with zero, one and two nodal diameters. In these modes shaft deflection was clearly visible. In forced vibration analysis a different EO excitation was applied for each stage. The importance of using models with different numbers of blades on each disc is apparent when compared with earlier results concerning discs with identical numbers of blades. Here the model of 8 discs with an equal number of blades on each disc is referred to as (Model 1), and the model of 8 discs with a different number of blades on each disc is referred to as (Model 2).
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Rzadkowski, Romuald, and Artur Maurin. "Multi-Stage Coupled Forced Response of Aircraft Engine Compressor and Turbine Bladed Discs." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57643.

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Considered here is the effect of multistage coupling on the dynamics of an aircraft engine rotor with eight mistuned bladed discs on a drum-disc shaft during foreign object ingestion (FOI). In the dynamic model, each disc had a different number of rotor blades. Free and forced vibrations were examined using finite element models of single rotating blades, bladed discs and an entire rotor with bladed discs. Calculations of the mode shapes of flexible mistuned bladed disc-shaft assemblies took into account simultaneous excitations of the first and second stages of the compressor and the turbine bladed disc with 0EO, 1EO and 2EO. The thus obtained maximal stress values of all of the rotor blades were carefully examined and compared with a tuned system to discover resonance conditions and coupling effects. Our investigation has shown that mistuning changes the stress distribution in individual rotor blades and the level of maximum stress increases in relation to single or multiple bladed disc excitation.
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Rzadkowski, Romuald, and Artur Maurin. "Multistage Coupling of Eight Mistuned Bladed Disk on a Solid Shaft: Part 1—Free Vibration Analysis." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68391.

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Considered here was the effect of multistage coupling on the dynamics of a rotor consisting of eight mistuned bladed discs on a solid shaft. Each bladed disc had a different number of rotor blades. Free vibrations were examined using finite element representations of rotating single blades, bladed discs, and the entire rotor. In this study the global rotating mode shapes of eight flexible mistuned bladed discs on shaft assemblies were calculated, taking into account rotational effects such as centrifugal stiffening. The thus obtained natural frequencies of the blade, shaft, bladed disc and entire shaft with discs were carefully examined to discover resonance conditions and coupling effects. This study found that mistuned systems cause far more intensive multistage coupling than tuned ones. The greater the mistuning, the more intense the multistage coupling.
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Peng, He, Zhansheng Liu, Guilong Wang, and Min Zhang. "Rotor Dynamic Analysis of Tie-Bolt Fastened Rotor Based on Elastic-Plastic Contact." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45796.

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The tie-bolt fastened rotor which is assembled by rods distributed circumferentially is modeled and analyzed by finite element method with the consideration of elastic-plastic contact between discs. Based on elastic-plastic contact model between an elastic hemisphere and a rigid plane, the contact between discs is investigated by the statistical contact model of rough surfaces, and the contact stiffness is derived. The equivalent bending stiffness between discs is acquired. With the increase of the load between the two contact surfaces, the difference between the contact stiffness of purely elastic contact and elastic-plastic model is compared. With the obtained contact stiffness, the equation of motion for the tie-bolt fastened rotor system is formed and the critical speeds are calculated. It indicates that the contact stiffness between discs increases as the load increases. The contact stiffness of elastic-plastic contact model is lower than that of the elastic contact model, and the difference between the two models increases with load. With the stiffness of elastic-plastic contact, the critical speeds of tie-bolt fastened rotor are lower than that of the pure elastic contact situation.
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Reuter, Ilko, Thomas Weiss, Matthias Voigt, Konrad Vogeler, Hartmut Schlums, Karl-Helmut Becker, and Andreas Fischersworring-Bunk. "Probabilistic Structure-Mechanical Assessment of Rotor Discs Considering Geometry Variations." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94589.

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For rotating critical parts, like compressor or turbine discs of aero engines, it is essential to perform reliable life predictions. Probabilistic methods are ideal to investigate these life predictions with regard to their sensitivities and robustness. Beside other system properties, the variation of geometrical disc parameters has a strong influence on the physical system behavior. Within this paper, the system behavior of a turbine disc is assessed with regard to its sensitivities, to enable the continuous optimization of the disc and to verify a new post-processing method. To suit this purpose, a process chain was developed from CAD-model to lifing analysis and embedded into a Monte Carlo Simulation (MCS). As input parameters geometrical parameters and their optimization ranges are used. The statistical evaluation of an MCS with regard to sensitivities is based on comparison of topologically similar locations. Similarity is achieved by the standard operation of “mesh morphing”, in which the original mesh of the initial geometry is deformed onto the new geometry. This method is limited to small variations. Another method is remeshing of the new geometry. This makes direct comparison at identical FE-nodes impossible and post-processing is done based on significant local features. The post-processing method described in this paper is a combination of aforementioned approaches. Based on this new method, the result variables von-Mises stress and life cycles are investigated for their sensitivities to geometrical parameters within the disc bore.
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Rza¸dkowski, Romuald, and Marcin Drewczynski. "Forced Vibration of Several Bladed Discs on the Shaft." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90158.

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The effect of multistage coupling on the dynamics of a rotor consisting of eight bladed discs on a solid shaft is considered. Free vibrations are examined using finite element representations of rotating single blades, bladed discs, and the complete rotor. In this study, the global rotating mode shapes of flexible tuned bladed discs-shaft assemblies are calculated. Rotational effects, such as centrifugal stiffening are accounted for. The calculated natural frequencies obtained from the blade, the shaft, the bladed disc, and the complete shaft with discs are carefully examined to discover resonance conditions and the coupling effects. It was found that the flexible modes of the tuned bladed discs affected by shaft motion are those with zero, one and two nodal diameters. In these modes the shaft deflection is clearly visible. Different EO excitation is applied for particular stages in forced vibration analysis.
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9

Zhu, Yongxiang, Jinming Leng, and Shidong Tang. "Technology for Straightening the Bent GT Rotor." In ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55423.

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The GT rotor is composed of a plurality of discs and two shafts. The GT gas turbine rotor may be bent after assembled because of each part has its geometric tolerance.The scheme must be carry out to straight the bend rotor. In oder to get well high speed balance, the surface of each disc excircle, torque tube and disc adaptor can’t be remachine on lath after assemble. We can machine the journal of the shaft on horizontal lathe to straight the slightly bended rotor. For the serious bended rotor, we must disassemble the rotor and change the parallelism of two side of the disc flange on vertical lathe to get a straight rotor. This attic detailed analysis these two schemes and proposed specific actions measures, then the problem of how to straight a bent GT rotor get well solution.
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Becker, Fabian B., Martin A. Sehr, and Stephan Rinderknecht. "Gain-Scheduled ℋ∞-Control for Active Vibration Isolation of a Gyroscopic Rotor." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9119.

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This paper deals with active vibration isolation of unbalance-induced oscillations in rotors using gain-scheduled H∞-controller via active bearings. Rotating machines are often exposed to gyroscopic effects, which occur due to bending deformations of rotors and the consequent tilting of rotor disks. The underlying gyroscopic moments are proportional to the rotational speed and couple the rotor’s radial degrees of freedom. Accordingly, linear time-varying models are well suited to describe the system dynamics in dependence on changing rotational speeds. In this paper, we design gain-scheduled H∞-controllers guaranteeing both robust stability and performance within a predefined range of operating speeds. The paper is based on a rotor test rig with two unbalance-induced resonances in its operating range. The rotor has two discs and is supported by one active and one passive bearing. The active support consists of two piezoelectric stack actuators and two collocated piezoelectric load washers. In addition, the rig is equipped with four inductive displacement sensors located at the discs. Closed-loop performance is assessed via isolation of unbalance-induced vibrations using both simulation and experimental data. This contribution is the next step on our path to achieving the long-term objective of combined vibration attenuation and isolation.
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Reports on the topic "ROTOR DISCS"

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Bernstein. PR-275-09207-R01 Method and Procedure for Remaining Life Assessment of the Combustion Turbine Disks. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), September 2012. http://dx.doi.org/10.55274/r0010044.

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A study of the remaining rotor life of gas turbines (or combustion turbines) used in the oil and gas industry was performed by Gas Turbine Materials Associates (GTMA). The study focused upon analytical methods of determining the remaining rotor life using a reduced data set, where not all of the operating data is known. As part of this study, a survey of oil and gas users was performed on their rotor life. An analytical model and methodology for determining the remaining rotor life was developed. This model and methodology was applied to the GE MS5002 gas turbine. By using this model for a PRCI member, the life of a rotor was safely extended for 100,000 hours beyond its design life. GTMA estimated that this PRCI member saved approximately $1,000,000 from this one application, and that repeated applications of the model for this, and other, PRCI members would save well over $10,000,000. The results of this work should also be applicable to other gas turbines, including those used by electric utilities, IPP�s, and other industrial operators.
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Okada, Hiroki. Analysis of the Thermal Deformation of Automotive Disc Rotor. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0336.

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Blau, Peter Julian. Prospects for Titanium-Based Materials as Truck Disc Brake Rotors. Office of Scientific and Technical Information (OSTI), September 2010. http://dx.doi.org/10.2172/1081592.

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