Relevant bibliographies by topics / Centrifugal brake

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Centrifugal brake'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Centrifugal brake"

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Nosko, A. L., E. V. Safronov, and D. V. Kirillov. "Selection of Materials of Friction Lining Centrifugal Brake Rollers." Journal of Friction and Wear 40, no. 3 (May 2019): 218–22. http://dx.doi.org/10.3103/s1068366619030085.

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Safronov, E. V., A. L. Nosko, and A. I. Balashova. "The influence of the length of the lining on the speed of movement of the pallet on the centrifugal friction roller." Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 6, no. 4 (December 25, 2020): 497–505. http://dx.doi.org/10.22281/2413-9920-2020-06-04-497-505.

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Pallet flow rack is one of the high-density storage systems. One of the main safety elements of the systems is a brake roller. Centrifugal frictional brake is the widely used type of the brake rollers, which used as speed governor for the pallet. The known method of calculation of the pallet speed on the flow rack does not take into account the length of the friction lining. In reality, the contact of the friction lining and the roller shell occurs in an arc that reaches the full length of the lining during operation. The method of calculating the speed of movement of the pallet on a centrifugal friction roller is given, and a calculation formula is obtained that allows taking into account the uniform distribution of the force of the normal pressure along the length of the lining. The results of a comparative calculation are presented, which showed that the speed of the pallet movement when taking into account the length of the lining is lower than the values obtained without taking it into account. It is found that if the lining length is up to 70 mm, it can be ignored in the calculations using a simpler formula, and if the lining length is more than 70 mm, it is recommended to use the calculation formula obtained in the work.
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Sharifullin, I. A., A. L. Nosko, and E. V. Safronov. "MATHEMATICAL MODEL OF THE MOTION PALLET PROCESS ON BRAKE MAGNETIC TYPE ROLLER." Russian Automobile and Highway Industry Journal 17, no. 3 (July 22, 2020): 364–73. http://dx.doi.org/10.26518/2071-7296-2020-17-3-364-373.

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Introduction. One of the main elements of the safe operation of gravity roller conveyors used in pallet racks is a brake roller. The most promising design is the brake roller magnetic (eddy current) type. The operation principle of such rollers is based on the laws of electromagnetic induction and involves the braking of a conductor moving in a magnetic field, due to the interaction of eddy currents (or Foucault currents) arising in the volume of the conductor with an external magnetic field. However, in the market of warehouse shelving equipment, brake magnetic rollers are not widely used due to their high cost, which is primarily due to the lack of domestic designs and methods for their calculation. The aim of the work is to develop a mathematical model of the moving pallets process on a magnetic type brake roller.Materials and methods. The paper presented the theoretical study results on the development of a mathematical model of the moving pallets process on a magnetic type brake roller, described in works on centrifugal friction rollers and eddy current brake devices.Results. The main parameter determining the functions of the brake magnetic roller and hence the speed of the pallet along the gravity roller conveyor is a magnetic viscosity coefficient. The speed dependence of the pallets on the brake magnetic roller for various values of a magnetic viscosity coefficient is determined, its analysis is carried out.Conclusions. A mathematical model of the moving pallets process on a brake magnetic roller is developed. The movement speed equation of the pallets on the brake magnetic roller is obtained. For a reasonable choice of the design parameters of the magnetic brake roller, experimental studies are required to determine a magnetic viscosity coefficient.
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Schnittger, J. R. "Dimensional Analysis in Design." Journal of Vibration and Acoustics 110, no. 3 (July 1, 1988): 401–7. http://dx.doi.org/10.1115/1.3269533.

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New guidelines for dimensional analysis remove traditional road-blocks to its widespread use in mechanical design. Cases, with or without prior formula given, are exposed as well as those with a governing differential equation. The examples include bevel gear, helical spring, centrifugal pump, journal bearing, vibration of turbine blades, and a disk brake. A matrix method to determine nondimensional groups is reviewed.
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Fan, Yi. "The Research and Design on the Electric Vehicles’ Centrifugal Automatic Transmission." Applied Mechanics and Materials 721 (December 2014): 12–15. http://dx.doi.org/10.4028/www.scientific.net/amm.721.12.

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Aiming at the deficiencies of the commonly used AMT and DSG structure in the electric vehicles’ transmission, a kind of three-speed automatic transmission structured by the planetary gear trains is designed. It uses the centrifugal components to realize the gear shifting, while using the electromagnetic brake and the motor reversal to realize the reversing. Based on the design concepts proposed, we did some matching calculations on the transmission system of a three-wheel pure electric vehicle, and finally made the optimization design on the driving motor’s selection and transmission parameters. The designed electric vehicle’s centrifugal automatic transmission has the characteristics of simple structure, small size and shifting smoothness, which can not only meet the requirements of the automobile power, but also improve the efficiency of the driving motor.
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Djerroud, Massinissa, Guyh Dituba Ngoma, and Walid Ghie. "Numerical Identification of Key Design Parameters Enhancing the Centrifugal Pump Performance: Impeller, Impeller-Volute, and Impeller-Diffuser." ISRN Mechanical Engineering 2011 (November 16, 2011): 1–16. http://dx.doi.org/10.5402/2011/794341.

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This paper presents the numerical investigation of the effects that the pertinent design parameters, including the blade height, the blade number, the outlet blade angle, the blade width, and the impeller diameter, have on the steady state liquid flow in a three-dimensional centrifugal pump. Three cases were considered for this study: impeller, combined impeller and volute, and combined impeller and diffuser. The continuity and Navier-Stokes equations with the k-ε turbulence model and the standard wall functions were used by means of ANSYS-CFX code. The results achieved reveal that the selected key design parameters have an impact on the centrifugal pump performance describing the pump head, the brake horsepower, and the overall efficiency. To valid the developed approach, the results of numerical simulation were compared with the experimental results considering the case of combined impeller and diffuser.
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La Roche-Carrier, Nicolas, Guyh Dituba Ngoma, and Walid Ghie. "Numerical Investigation of a First Stage of a Multistage Centrifugal Pump: Impeller, Diffuser with Return Vanes, and Casing." ISRN Mechanical Engineering 2013 (June 19, 2013): 1–15. http://dx.doi.org/10.1155/2013/578072.

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This paper deals with the numerical investigation of a liquid flow in a first stage of a multistage centrifugal pump consisting of an impeller, diffuser with return vanes, and casing. The continuity and Navier-Stokes equations with the k-ε turbulence model and standard wall functions were used. To improve the design of the pump's first stage, the impacts of the impeller blade height and diffuser vane height, number of impeller blades, diffuser vanes and diffuser return vanes, and wall roughness height on the performances of the first stage of a multistage centrifugal pump were analyzed. The results achieved reveal that the selected parameters affect the pump head, brake horsepower, and efficiency in a strong yet different manner. To validate the model developed, the results of the numerical simulations were compared with the experimental results from the pump manufacturer.
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Nosko, A. L., E. V. Safronov, and V. A. Soloviev. "Study of Friction and Wear Characteristics of the Friction Pair of Centrifugal Brake Rollers." Journal of Friction and Wear 39, no. 2 (March 2018): 145–51. http://dx.doi.org/10.3103/s1068366618020125.

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Safronov, Eugene V., and Andrey L. Nosko. "Influence of the brake lining position on the efficiency of the centrifugal friction roller." IOP Conference Series: Materials Science and Engineering 709 (January 3, 2020): 022086. http://dx.doi.org/10.1088/1757-899x/709/2/022086.

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Sungkhaphaitoon, Phairote, Thawatchai Plookphol, and Sirikul Wisutmethangoon. "Centrifugal Atomization of Zinc Metal Powder for Friction Materials Application." Advanced Materials Research 488-489 (March 2012): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.281.

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In the present work, a centrifugal atomization was studied for producing zinc metal powder. The effect of rotating disc speed on median particle size, particle size distribution and standard deviation, production yield, and morphology of the atomized zinc powder was investigated. The atomization was carried out using graphite flat disc, melt pouring temperature, preheating disc temperature and melt feed rate of 40 mm, 550 °C, 300 °C and 50 kg/h, respectively. The atomizer disc speeds were varied from 10,000 to 30,000 rpm. It was evidenced from the experimental results that the median particle size and standard deviation of zinc metal powder decreased with increasing disc speed. The production yield tended to increase with increasing rotating speed. SEM images revealed that most zinc metal particles were irregular, elongated flakes. This kind of zinc power may be suitable for use as a friction material for manufacturing brake pad component in the automotive part industry
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Dissertations / Theses on the topic "Centrifugal brake"

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Lebeau, Timothy Charles. "Brake drum production by centrifugal casting." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2009r/lebeau.pdf.

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Vít, Jakub. "Odstředivá brzda motoru pro pneumatikový válec." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232084.

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The aim of my thesis is the design of centrifugal brakes to prevent twisting of the combustion engine with pneumatic compactor. In the first part of my thesis I deal with existing and similar systems that prevent over speeding. In the second part I deal with the design of its own centrifugal brake. This includes basic functional, strength, thermal calculation, design of components and fabrication drawings according to the assignment.
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Book chapters on the topic "Centrifugal brake"

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"Centrifugal, One-Way, and Detent Clutches." In Clutches and Brakes. CRC Press, 2004. http://dx.doi.org/10.1201/9780203026236.ch9.

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Conference papers on the topic "Centrifugal brake"

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Kimura, Toshiya, Satoshi Kawasaki, Mitsuru Shimagaki, and Masaharu Uchiumi. "Effects of Swirl Brakes on the Leakage Flow Between the Casing and the Shroud of a Centrifugal Impeller." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-06048.

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CFD simulations were performed for the leakage flow in the gap between the casing and the shroud of a centrifugal impeller. The effects of swirl brakes created in the casing on the leakage flow were numerically investigated. The leakage flow swirling due to impeller rotation was trapped inside a swirl brake and interacted with the walls of the swirl brake, generating a very complex flow and a vortex structure inside. By the interaction with swirl brakes, the leakage flow rapidly lost its angular momentum mainly in the outer region of the swirl brake. The loss of swirl resulted in a decrease of the pressure difference in the radial direction due to the centrifugal force effect. The radial distribution of pressure in the gap between the casing and the shroud was largely modified, and thus the axial thrust force on the impeller was changed as well. The thrust balance of the impeller can be adjusted by an appropriate design of swirl brakes and the instability of rotating shaft can be reduced by decreasing the swirl of the leakage flow.
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Wilkes, Jason, Natalie Smith, Balaji Venkataraman, Marco Vagani, and Sara Goucher. "Experimentally Measured Effectiveness of Different Shroud Swirl Brake Profiles in a Centrifugal Compressor." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91676.

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Abstract As centrifugal compressors are pushed to operate at higher pressures and higher power levels, destabilizing gas forces often increase the challenge of designing a stable rotordynamic system. While technical innovations like damper seals, swirl brakes, and damper bearings that help stabilize compressors are numerous, predicting the impact that these improvements will have on a specific system is somewhat of an art form. To this end, researchers are constantly improving the depth of knowledge on these features so that the impact of these improvements is well defined. In the current work, the authors experimentally measured the impact of different swirl brake/vane concepts on the flow characteristics of a centrifugal compressor shroud cavity. The eye seal configuration studied here is a tooth on rotor labyrinth eye seal. The different shroud swirl vane geometries considered consist of various castellated features, each having the intent to reduce swirl velocity in the shroud cavity prior to entering the seal. The purpose of the testing was to determine whether a significant reduction in swirl velocity entering or exiting the seal could be measured with the different anti-swirl vane profiles over a conventional shroud cavity that was tested with the same setup. The metrics that determine the effectiveness of the swirl brake were based on upstream and downstream measurements of swirl velocity using pitot-probes at different depths in the shroud cavity, and measurements of seal exit angle and velocity using a traversing cobra-probe. The test data presented herein show definitively that the different swirl brake designs, including a slotted seal, a long vane, and a short vane, have a major impact on swirl velocities relative to the conventional shroud design. The most effective at reducing swirl entering/leaving the seal is the slotted seal, while the concepts employing shroud vanes were more effective at reducing swirl in the shroud cavity.
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Da Soghe, Riccardo, Mirko Micio, Antonio Andreini, Bruno Facchini, Luca Innocenti, and Alberto Ceccherini. "Numerical Characterization of Swirl Brakes for High Pressure Centrifugal Compressors." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94075.

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High pressure centrifugal compressors continue to experience vibrations due to rotordynamic stability. The main cause for aero-induced exciting forces that affects the stability, is the tangential velocity component of the gas entering the many labyrinth seals throughout the machine. In order to control or limit these swirling flows, swirl brakes are generally implemented both at the impeller eye seals and at the balance piston or division wall seal of a centrifugal compressor. This paper deals with the aerodynamic characterization, by means of CFD, of such kind of devices. Several design parameters, such as teeth lean, angle of attack and pitch-to-chord ratio have been considered and also the operating conditions (pressure level and swirl at the swirl brake inlet) are accounted for. This paper aims to improve the physical understanding of the fluid flow of centrifugal compressors swirl brakes allowing an optimization of such systems.
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Song, Haijun, Jian Song, Shengnan Fang, Yuzhuo Tai, Fei Li, and Truong Sinh Nguyen. "Analysis of the Novel Two-Speed Uninterrupted Transmission With Centrifugal Clutch for Electric Vehicle." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46739.

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Current research suggests that the performance of electric vehicle with a single-speed transmission can still be widely improved. The novel two-speed uninterrupted transmission consists of a single-row planetary, a centrifugal clutch, a brake, and two motor controlling clutch and brake. Changing the switch of clutch and brake can achieve two-speed uninterrupted gearshifts. Different from the traditional centrifugal clutch, a novel adjustable device is specifically designed to control the switch of clutch. Torque characteristics of clutch prototype are displayed. Some differences of the gearshift methodology are specifically designed to compensate for the characteristics of the electric traction motor and the adjustable centrifugal clutch. The specific simulation model is established according to the novel uninterrupted transmission prototype. The dynamic characteristics of the two-speed uninterrupted transmission system are analyzed. The higher utilization ratio of the traction motor power increases the efficiency of the traction motor with the novel two-speed uninterrupted transmission.
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Yun, Dongwon, Jeong-Hoi Koo, Sunghwi Lee, and Byungin Kim. "A Novel Safety Brake System Based on Magneto-Rheological Fluids." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9053.

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This paper presents a novel Magentorheological (MR) brake with permanent magnets. The proposed MR brake can generate a braking torque at a critical rotation speed without an external power source, sensors, or controllers, making it simple and cost-effective device. The brake system consists of a rotary disk, permanent magnets, springs and MR fluid. Permanent magnets are attached to the rotary disk via springs, and they move outward through grooves with two different gap distances along the radial direction of the stator due to centrifugal force. Thus, the position of the magnets is dependent on the spin speed, and it can determine the magnetic fields applied to MR fluids. Proper design of the stator geometry gives the system unique torque characteristics. To show the performance of an MR brake system, the electromagnetic characteristics of the system are analyzed, and the torques generated by the brake are calculated using the result of the electromagnetic analysis. After the simulation study, a prototype brake system is constructed and its performance is experimentally evaluated. The results demonstrate the feasibility of the proposed MR brake as a speed regulator in rotating systems.
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Das, Susanta K. "Experimental Performance Evaluation of a Centrifugal Pump With Different Impeller Vane Geometries." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38985.

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Centrifugal pumps vane geometry plays an important role in pump’s overall performance. Thus, to know the impeller vane geometry effects on the performance of a centrifugal pump are essential from pump’s design point of view. In this study, an experimental investigation is carried out to judge the impeller vane geometry effects on the performance of a centrifugal pump. The performance of three different impeller vane geometries is evaluated in this investigation. To acquire pump performance and characteristics curves, inlet and outlet valves were manually adjusted and the pump’s rpm were varied remotely through computer control. The pressure data were obtained via installed flow rotameter for different flow rates with constant pump speed – 1800 rpm. Experimental data were used to calculate different physical parameters, such as the pump head, water horsepower — the power added to the fluid, power input to the pump–brake horse power, and pump efficiency for each of impeller vane geometries. The pump’s performance curves and the system curves were then plotted for each of the vane geometries. The results show that the pump performance as well as efficiency varies significantly for each of the impeller vane geometries. The results help to understand how to determine appropriate operating conditions and design parameters for different impeller vane geometries for obtaining optimized pump performance.
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Heuer, Tom, Bertold Engels, and Patrick Wollscheid. "Thermomechanical Analysis of a Turbocharger Based on Conjugate Heat Transfer." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68059.

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One of the most challenging tasks in designing a turbocharger is to guarantee a sufficient lifetime. Turbine housings are critical parts due to their very complex geometry and consequently complicated temperature and stress distributions. Therefore, high thermal loads as well as thermo-mechanical fatigue have to be considered. Calculating the thermal stress distribution in the turbine housing, steady state and transient, can indicate the regions of crack initiation. From this information selective design improvements can be deduced to increase the component lifetime. But the quality of the stress analysis is strongly dependent on a reliable temperature distribution. Taking into account the interdependency of heat transfer between solid walls and fluid, conjugate heat transfer (CHT) calculations can provide temperature data of high accuracy. Since a transient CHT-calculation is still beyond state of the art, a new approach has been developed. Two steady state CHT-calculations serve to determine heat transfer coefficients at engine brake and full load. Beginning with the engine brake temperature distribution, it is assumed that the gas temperature and the mass flow change immediately. Therefore heat transfer coefficients at full load serve as a boundary condition for a subsequent transient solid body calculation simulating the acceleration process. For the deceleration process the full load temperature field is combined with the engine brake heat transfer coefficients. Monitor points give information about the steepest temperature gradients in the material. At discrete time points a steady state stress analysis has to be performed to detect the regions of highest loads. This subsequent step is essential because in a complex geometry like in a spiral housing with a divider and regionally different wall thicknesses, the stress maxima are not necessarily located at the same places as the temperature peaks. For the two steady state CHT-calculations the turbine wheel has been included in order to consider a realistic flow field. Compared to a transient calculation the degree of abstraction is as low as possible because the assumed frozen rotor boundary condition takes into account centrifugal and coriolis forces. This paper demonstrates the calculation procedure considering a twin-entry turbine housing with an integrated manifold designed for a truck application. The computational results are in excellent agreement with thermal shock test data. A second loop with an improved design proves the success of the method.
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Green, T., and A. B. Turner. "Ingestion Into the Upstream Wheelspace of an Axial Turbine Stage." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-303.

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The upstream wheelspace of an axial air turbine stage complete with nozzle guide vanes (NGV’s) and rotor blades (430 mm mean diameter) has been tested with the objective of examining the combined effect of NGV’s and rotor blades on the level of mainstream ingestion for different seal flow rates. A simple axial clearance seal was used with the rotor spun up to 6650 rpm by drawing air through it from atmospheric pressure with a large centrifugal compressor. The effect of rotational speed was examined for several constant mainsteam flow rates by controlling the rotor speed with an air brake. The circumferential variation in hub static pressure was measured at the trailing edge of the NGV’s upstream of the seal gap and was found to significantly affect ingestion. The hub static pressure distribution on the rotor blade leading edges was rotor speed dependent and could not be measured in the experiments. The Denton 3D C.F.D. computer code was used to predict the smoothed time dependent pressure field for the rotor together with the pressure distribution downstream of the NGV’s. The level and distribution of mainstream ingestion, and thus the seal effectiveness, was determined from nitrous oxide gas concentration measurements and related to static pressure measurements made throughout the wheelspace. With the axial clearance rim seal close to the rotor the presence of the blades had a complex effect. Rotor blades in connection with NGV’s were found to significantly reduce mainstream ingestion seal flow rates, but a small level of ingestion existed even for very high levels of seal flow rate.
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Longley, John P. "Modelling the Unsteady Dynamics of a Turbine Research Facility." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90352.

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Abstract The accuracy with which experimental investigations of turbine performance need to be undertaken require either a semi- or fully-automated control of the operating point as any variation can compromise the reliability of the measurements. Fundamentally, both the mass flow rate through the turbine and the applied brake torque need to be adjusted in real-time so that the required operating point is maintained. This paper describes the development of a time accurate computational simulation of the unsteady dynamics of a large-scale, low-speed turbine facility when its operating point is determined by a full-authority control system. The motivation for the development of the computational simulation was to be able to safely undertake parametric studies to refine the control system and to investigate the cause of monotonic excursions of the operating point which were observed after a major rebuild. The monotonic excursions of the turbine operating point could only be reproduced by the computational simulation after an unsteady aerodynamic coupling between the turbine exit flow and the downstream centrifugal fan had been incorporated. Based on this observation a honeycomb was installed upstream of the fan in the turbine facility. This eliminated the monotonic excursions and the fractional noise of the operating point was reduced by 37%. When combined with an earlier refinement of the control system the factional noise was reduced by a factor of three. This enables the number of repeated measurements to be reduced by nine and still obtain the same quality of data.
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Ayder, Erkan, Ayhan N. Ilikan, Mete S¸en, Cahit O¨zgu¨r, Levent Kavurmacıog˘lu, and Kadir Kirkkopru. "Experimental Investigation of the Complete Characteristics of Rotodynamic Pumps." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78052.

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Pump failure in a pipeline system can occur for several reasons and this undesirable event causes waterhammer phenomenon. While designing a pipeline system, minimum and maximum pressures caused by waterhammer and the variation of the pressure along the pipeline with respect to time must be determined. In order to calculate the time variation of the pressure, complete characteristics of a pump is used as one of the boundary conditions. In these unsteady conditions, the pump may turn in normal or reverse directions which define eight different working zones called pump, turbine, brake and booster. Specific speed is an essential parameter which affects characteristics of pumps. In the literature, for many years there have been only three complete pump characteristics obtained with the assistance of 1960’s measuring devices and techniques. Each one of those corresponds to pumps having centrifugal (nsq = 35), mixed flow (nsq = 147) or axial impeller (nsq = 261). Recently additional complete pump characteristics that belong to 14 different specific speeds have been published in the literature. By considering improvements in pump design during half a century and innovations in measurement techniques, the present study is performed to repeat experiments of complete characteristics of different specific speeds existing in the literature, and to obtain complete pump characteristics for different specific speeds. The complete characteristics of seven pumps with specific speeds of nsq = 20 – 23 – 33 – 55 – 105 – 209 and 261 are obtained experimentally. The results show that the complete characteristics of a pump is not only function of specific speed but also function of pump design. The number of the complete pump characteristics available in the literature is increased in this study. The obtained results revealed that, unlike the existing approach in the literature, the complete characteristics of pump that is used in the pipeline, must be used in the calculation of waterhammer pressures in the design of pipelines.
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