Relevant bibliographies by topics / Constant speed drive (CSD)

Contents

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

Academic literature on the topic 'Constant speed drive (CSD)'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Constant speed drive (CSD)"

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Kim, Sung-An, and Kyung-Pyo Hong. "Analysis and Experimental Verification of a Variable Speed Turbo Air Centrifugal Compressor System for Energy Saving." Energies 14, no. 4 (2021): 1208. http://dx.doi.org/10.3390/en14041208.

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Conventional constant speed turbo air centrifugal compressor systems (TACCSs) consist of an electric motor driven at the constant speed and an inlet guide vane (IGV) for pressure control. TACCSs with an inverter for a variable speed drive (VSD) of the electric motor are more efficient than the conventional constant speed TACCS because they have a wide operating range and can minimize the power consumption. Therefore, this paper proposes a quadratic V/f control and VSD to reduce electrical and mechanical energy losses. To verify the energy saving effect of the TACCS with the proposed controls, this paper analyzes the performances of an electric motor drive system (EMDS) using the proposed quadratic V/f control considering load conditions of the turbo air centrifugal compressor (TACC) to reduce electrical energy losses. Furthermore, the performances of the conventional constant speed drive (CSD) using the IGV control and the proposed VSD were compared and analyzed in the test bench that represented an actual factory environment. As a result, the proposed quadratic V/f control and VSD experimentally verified energy savings of 4.44% and 23.37% compared to conventional controls. In addition, the economic feasibility of the proposed VSD was verified in the TACCS by analyzing the recovery period of the initial investment due to the addition of the inverter.
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Zheng, Xudong, Fangwei Xie, Diancheng Wu, et al. "CFD simulation of air effect on flow field characteristics of hydro-viscous clutch with constant speed difference." Mechanics & Industry 19, no. 2 (2018): 208. http://dx.doi.org/10.1051/meca/2018032.

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The purpose of this paper is to study the air effects on transmission characteristics of hydro-viscous clutch and reveal the distribution law of the flow field of the oil film. The computational-fluid-dynamics (CFD) simulation model of oil film with radial oil grooves between friction pairs is taken as the study object. Considering the air effects, the pressure field, two-phase distribution, transmission torque and temperature field of the oil film are analyzed comparatively by using the CFD technology. The results show that the presence of air changes the pressure and temperature distributions of the oil film. With increase of the absolute rotational speed, the air volume fraction increases and the radius value of the air-liquid boundary decreases under condition of constant speed difference, which makes the coverage rate of the oil film on the surface of the friction disks reduce and the transmission torque of the oil film decrease. These simulation results are attributed to the study of hydro-viscous-drive and its applications. This paper also can provide a theoretical basis for the mechanism of power transmission through oil film in the presence of air effects.
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Li, Zhibao, Fangwei Xie, Junyu Sun, et al. "Influence of structural parameters of friction pair on oil temperature rise in hydro-viscous clutch." Industrial Lubrication and Tribology 72, no. 1 (2019): 79–85. http://dx.doi.org/10.1108/ilt-11-2018-0428.

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Purpose The purpose of this paper is to study the temperature characteristics of hydro-viscous clutch with different structure of friction disks and obtain the distribution of film temperature. Design/methodology/approach The mathematical model of oil film between friction disks with radial grooves is established. Based on the flow rate equation, the temperature rise equation of oil film is deduced. Considering two-phase flow, the temperature distribution in the oil shear stage and the effects of the ratio of inner radius to outer radius on film temperature rise is studied by using computational fluid dynamics (CFD) technology. Findings The results show that when input speed is constant, the increase in the ratio of inner to outer radius leads to an increase in the peak temperature and the decrease in the ratio results in a larger increasing rate of temperature. Originality/value These results are of interest for the study of hydro-viscous drive and its applications. This study can also provide a theoretical basis for the mechanism of temperature rise by considering the effect of two-phase flow.
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Chen, Si, Le Wang, Shijun Guo, Chunsheng Zhao, and Mingbo Tong. "A Bio-Inspired Flapping Wing Rotor of Variant Frequency Driven by Ultrasonic Motor." Applied Sciences 10, no. 1 (2020): 412. http://dx.doi.org/10.3390/app10010412.

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By combining the flapping and rotary motion, a bio-inspired flapping wing rotor (FWR) is a unique kinematics of motion. It can produce a significantly greater aerodynamic lift and efficiency than mimicking the insect wings in a vertical take-off and landing (VTOL). To produce the same lift, the FWR’s flapping frequency, twist angle, and self-propelling rotational speed is significantly smaller than the insect-like flapping wings and rotors. Like its opponents, however, the effect of variant flapping frequency (VFF) of a FWR, during a flapping cycle on its aerodynamic characteristics and efficiency, remains to be evaluated. A FWR model is built to carry out experimental work. To be able to vary the flapping frequency rapidly during a stroke, an ultrasonic motor (USM) is used to drive the FWR. Experiment and numerical simulation using computational fluid dynamics (CFD) are performed in a VFF range versus the usual constant flapping frequency (CFF) cases. The measured lifting forces agree very well with the CFD results. Flapping frequency in an up-stroke is smaller than a down-stroke, and the negative lift and inertia forces can be reduced significantly. The average lift of the FWR where the motion in VFF is greater than the CFF, in the same input motor power or equivalent flapping frequency. In other words, the required power for a VFF case to produce a specified lift is less than a CFF case. For this FWR model, the optimal installation angle of the wings for high lift and efficiency is found to be 30° and the Strouhal number of the VFF cases is between 0.3–0.36.
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Liang, Yinong, Ting Zhu, and Andreas Enqvist. "Timing Characterization of Helium-4 Fast Neutron Detector with EJ-309 Organic Liquid Scintillator." EPJ Web of Conferences 170 (2018): 07005. http://dx.doi.org/10.1051/epjconf/201817007005.

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Recently, the Helium-4 gas fast neutron scintillation detectors is being used in time-sensitive measurements, such time-of-flight and multiplicity counting. In this paper, a set of time aligned signals was acquired in a coincidence measurement using the Helium-4 gas detectors and EJ-309 liquid scintillators. The high-speed digitizer system is implanted with a trigger moving average window (MAW) unit combing with its constant fraction discriminator (CFD) feature. It can calculate a “time offset” to the timestamp value to get a higher resolution timestamp (up to 50 ps), which is better than the digitizer's time resolution (4 ns) [1]. The digitized waveforms were saved to the computer hard drive and post processed with digital analysis code to determine the difference of their arrival times. The full-width at half-maximum (FWHM) of the Gaussian fit was used as to examine the resolution. For the cascade decay of Cobalt-60 (1.17 and 1.33 MeV), the first version of the Helium-4 detector with two Hamamatsu R580 photomultipliers (PMT) installed at either end of the cylindrical gas chamber (20 cm in length and 4.4 cm in diameter) has a time resolution which is about 3.139 ns FWHM. With improved knowledge of the timing performance, the Helium-4 scintillation detectors are excellent for neutron energy spectrometry applications requiring high temporal and energy resolutions.
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Jridi, Maher, Ayman Alfalou, and Pramod Kumar Meher. "Optimized Architecture Using a Novel Subexpression Elimination on Loeffler Algorithm for DCT-Based Image Compression." VLSI Design 2012 (May 30, 2012): 1–12. http://dx.doi.org/10.1155/2012/209208.

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The canonical signed digit (CSD) representation of constant coefficients is a unique signed data representation containing the fewest number of nonzero bits. Consequently, for constant multipliers, the number of additions and subtractions is minimized by CSD representation of constant coefficients. This technique is mainly used for finite impulse response (FIR) filter by reducing the number of partial products. In this paper, we use CSD with a novel common subexpression elimination (CSE) scheme on the optimal Loeffler algorithm for the computation of discrete cosine transform (DCT). To meet the challenges of low-power and high-speed processing, we present an optimized image compression scheme based on two-dimensional DCT. Finally, a novel and a simple reconfigurable quantization method combined with DCT computation is presented to effectively save the computational complexity. We present here a new DCT architecture based on the proposed technique. From the experimental results obtained from the FPGA prototype we find that the proposed design has several advantages in terms of power reduction, speed performance, and saving of silicon area along with PSNR improvement over the existing designs as well as the Xilinx core.
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Vul, Y., R. Kalyakin, and A. Shablovskiy. "The Dynamic Characteristics of Hydraulic-Mechanical Constant Speed Drive." IOP Conference Series: Materials Science and Engineering 779 (April 24, 2020): 012021. http://dx.doi.org/10.1088/1757-899x/779/1/012021.

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Mwasilu, Francis. "Direct Predictive Speed Control of Salient PMSM Drives in Constant Torque and Constant Power Regimes for Electric Vehicles Applications." Tanzania Journal of Engineering and Technology 39, no. 2 (2020): 127–43. http://dx.doi.org/10.52339/tjet.v39i2.700.

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A direct speed control of salient permanent magnet synchronous motor (PMSM) drives in constant torque and constant power regimes for electric vehicles applications is presented. The proposed speed control scheme is derived from model predictive control approach where both rotor speed and stator current are formulated in a single objective function that is periodically computed to attain the PMSM drive optimum switching states. The dynamic model of the PMSM intrinsically encompasses the unknown disturbance, which should be rejected for high-performance speed control especially in transient conditions. Consequently, the extended modified augmented state Kalman filter (ASKF) is incorporated in the proposed scheme to enhance the transient performance of the salient PMSM drive. Finally, the proposed speed control strategy reveals a fast-transient speed response when compared to the conventional dual current loop PI-based speed controller over extended speed range and load torque variations. The computer simulation conducted using MATLAB/Simulink and experimental results obtained using PMSM laboratory prototype are presented considering constant torque and constant power regions to confirm the efficacy of the proposed speed control strategy.
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Y, Sukhi, and Padmanabhan S. "SOFT SWITCHING TECHNIQUE USING RESONANT CONVERTER FOR CONSTANT SPEED DRIVE." International Journal on Intelligent Electronic Systems 2, no. 1 (2008): 16–21. http://dx.doi.org/10.18000/ijies.30019.

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MIYATA, Keiichiro, Yasuhiro HAYAKAWA, and Hideo HANAFUSA. "Studies on a constant speed drive of a pneumatic cylinder." Hydraulics & Pneumatics 20, no. 3 (1989): 240–46. http://dx.doi.org/10.5739/jfps1970.20.240.

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Dissertations / Theses on the topic "Constant speed drive (CSD)"

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Austrin, Lars. "On magnetic amplifiers in aircraft applications." Licentiate thesis, Stockholm : Elektrotekniska system, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4439.

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Bhattacharya, Tanmoy. "Flux Estimation, Parameter Adaptation And Speed Sensorless Control For Vector Controlled Induction Motor Drive." Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1406.

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Books on the topic "Constant speed drive (CSD)"

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13An Electronically Controlled Drive for Marine Generators Operated at Constant Rotational Speed by the Main Engine of Ships (RCF Gearing Installation) (Energy). European Communities / Union (EUR-OP/OOPEC/OPOCE), 1988.

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Book chapters on the topic "Constant speed drive (CSD)"

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Mikhaylov, Maxim, Ilya Alksandrovich Larchikov, Andrej Vasilevich Yurov, Vladimir Cvetkov, and Sergey Stazhkov. "Hydromechanical Constant Speed Drive Forwind-Driven Generators." In DAAAM Proceedings. DAAAM International Vienna, 2011. http://dx.doi.org/10.2507/22nd.daaam.proceedings.117.

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"Technological Roads Not Taken: The Constant Speed Generator Drive." In Building the Trident Network. The MIT Press, 2001. http://dx.doi.org/10.7551/mitpress/1693.003.0007.

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Mikhaylov, Maxim, Sergey Stazhkov, and Vladimir Cvetkov. "Analysis of the Perturbing Actions on the Constant Speed Drive Input Link." In Proceedings of the 23rd International DAAAM Symposium 2012. DAAAM International Vienna, 2012. http://dx.doi.org/10.2507/23rd.daaam.proceedings.104.

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Shroff, Gautam. "Correct." In The Intelligent Web. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199646715.003.0011.

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Last summer I took my family on a driving holiday in the American south-western desert covering many national parks. While driving along some of the long tracts of razor-straight highways, such as between Las Vegas and St George, Utah, I often fought drowsiness, not because of lack of sleep, but from the sheer monotony. A familiar experience for many, no doubt. Hardly any conscious thought is needed during such drives. It must be one’s ‘System’, as per Kahneman, which is most certainly doing what ever work is needed. Nevertheless, sleep is not an option. In spite of all the marvellous features embedded in the modern car, the ability to drive itself is, sadly, still missing. The cruise control button helps a bit, allowing one’s feet torelax as the car’s speed remains on an even keel. But the eyes and mind must remain awake and alert. When, if ever, one wonders, will cars with a ‘drive’ button become as common as those with an automatic transmission? Is driving along a perfectly straight stretch of highway really that difficult? After all, we all know that a modern jetliner can fly on autopilot, allowing even a single pilot to read a novel while ‘flying’ the aircraft on a long transcontinental flight. In fact, the jetliner would fly itself perfectly even if the pilot dozed off for many minutes or even hours. We insist that at least one pilot be awake and alert only for our own peace of mind, so as to be able to adequately respond to any emergency situation that might arise. First of all, the ubiquitous autopilot is itself quite a complex piece of equipment. Even to get a plane to fly perfectly straight along a desired heading at a fixed altitude takes a lot of work. The reason, as you must have guessed, is that nature, in the guise of the air on which our jetliner rides, can be quite unpredictable. Wind speeds and directions change continuously, even ever so slightly, requiring constant adjustments to the plane’s engine power, ailerons, flaps, and rudder. In the absence of such adjustments, our jetliner would most certainly veer off course, or lose or gain speed, even dangerously enough to trigger a powered dive or a stall.
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Bunker, Bruce C., and William H. Casey. "Photochemistry and Excited-State Reactions of Oxides." In The Aqueous Chemistry of Oxides. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199384259.003.0020.

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The applied voltages that drive electrochemical processes (see Chapter 11) are only one of many energy sources that can be used to activate reactions in oxide molecules and materials. Another common energy source that drives many environmental and technological oxide reactions is light from the sun. Water plays a key role in many of these reactions. Imagine that you are on vacation floating in a warm ocean bathed by the sun. Many of the phenomena you experience, from your painful sunburn to the photosynthetic growth of the seaweed you see beneath you, are photoactivated processes. In this chapter, we highlight the roles that oxides play in photon-activated solar energy technologies. Also included are reactions stimulated by other nonthermal energy sources, including electrons in high-energy plasmas. Titanium oxide, found in common white paint, is the basis for much of the discussion, because this oxide is used in many photoelectrochemical energy storage technologies. The photochemistry of colloidal manganese- and iron-oxide particles suspended either in atmospheric droplets or in the upper photic zone of the ocean where the sunlight penetrates are discussed in Chapter 18. Such oxide reactions are important globally in the elimination of pollutants. Both industrial and environmental examples illustrate how oxides participate in a wide range of photoactivated chemical reactions, including the catalytic decomposition of water, photoelectrochemistry, and photoactivated dissolution and precipitation reactions. Before exploring excited-state reactions, we need to introduce the energy sources that provide such excitation. In most of this chapter, the excitation source of interest is light. Most of us are familiar with the electromagnetic spectrum, in which the energy of a photon is given by . . . E=hv=hc/λ=hcω (13.1). . . Here, h is Planck’s constant (h = 6.6 ·10 −34 J/second), c is the speed of light (3 ·1010cm/second), ν is the frequency of light (measured in Hertz or per second), λ is the wavelength of light (in centimeters), and ω is the wavelength expressed as wave number (measured per centimeter in infrared spectroscopy).
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Conference papers on the topic "Constant speed drive (CSD)"

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Sanderson, Douglas G. "Constant Speed Electrohydraulic Drive Mechanism for a Green Pea Harvester." In 1986 SAE International Off-Highway and Powerplant Congress and Exposition. SAE International, 1986. http://dx.doi.org/10.4271/861196.

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Choudhury, Abhijit, and Kishore Chatterjee. "Speed sensor less direct torque controlled induction motor drive with constant switching frequency operation." In 2011 IEEE Energytech. IEEE, 2011. http://dx.doi.org/10.1109/energytech.2011.5948541.

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Du, Xiaofei, and Yuanjun Zhou. "A GARCH Modeling Approach for Constant Speed Drive Residual Life Predicting of Aircraft Generator." In 2008 Fifth International Conference on Fuzzy Systems and Knowledge Discovery (FSKD). IEEE, 2008. http://dx.doi.org/10.1109/fskd.2008.90.

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Morandin, Mattia, Adriano Faggion, and Silverio Bolognani. "Different torque damping by a constant speed SPM machine drive in domestic cogeneration system." In 2013 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2013. http://dx.doi.org/10.1109/iemdc.2013.6556135.

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Kamper, Maarten J., and Wikus T. Villet. "Design and performance of compensated reluctance synchronous machine drive with extended constant power speed range." In 2012 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2012. http://dx.doi.org/10.1109/ecce.2012.6342233.

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Chen, Feida, Hao Ding, Sangwhee Lee, Wenda Feng, Thomas M. Jahns, and Bulent Sarlioglu. "Current Source Inverter Based Large Constant Power Speed Ratio SPM Machine Drive for Traction Applications." In 2020 IEEE Transportation Electrification Conference & Expo (ITEC). IEEE, 2020. http://dx.doi.org/10.1109/itec48692.2020.9161471.

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Stock, Alexander, Johannes Teigelkotter, Thomas Kowalski, and Stefan Staudt. "Highly efficient constant-speed drive system based on a doubly fed permanent magnet synchronous machine." In 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe). IEEE, 2015. http://dx.doi.org/10.1109/epe.2015.7309228.

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Mamat, Aman M. I., Muhamad H. Padzillah, Alessandro Romagnoli, and Ricardo F. Martinez-Botas. "A High Performance Low Pressure Ratio Turbine for Engine Electric Turbocompounding." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45541.

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In order to enhance energy extraction from the exhaust gases of a highly boosted downsized engine, an electric turbo-compounding unit can be fitted downstream of the main turbocharger. The extra energy made available to the vehicle can be used to feed batteries which can supply energy to electric units like superchargers, start and stop systems or other electric units. The current research focuses on the design of a turbine for a 1.0 litre gasoline engine which aims to reduce the CO2 emissions of a “cost-effective, ultra-efficient gasoline engine in small and large family car segment”. A 1-D engine simulation showed that a 3% improvement in brake specific fuel consumption (BSFC) can be expected with the use of an electric turbocompounding. However, the low pressure available to the exhaust gases expanded in the main turbocharger and the constant rotational speed required by the electric motor, motivated to design a new turbine which gives a high performance at lower pressures. Accordingly, a new turbine design was developed to recover energy of discharged exhaust gases at low pressure ratios (1.05–1.3) and to drive a small electric generator with a maximum power output of 1.0 kW. The design operating conditions were fixed at 50,000 rpm with a pressure ratio of 1.1. Commercially available turbines are not suitable for this purpose due to the very low efficiencies experienced when operating in these pressure ranges. The low pressure turbine design was carried out through a conventional non-dimensional mixed-flow turbine design method. The design procedure started with the establishment of 2-D configurations and was followed by the 3-D radial fibre blade design. A vane-less turbine volute was designed based on the knowledge of the rotor inlet flow direction and the magnitude of the absolute speed. The overall dimensions of the volute design were defined by the area-to-radius ratios at each respective volute circumferential azimuth angle. Subsequently, a comprehensive steady-state turbine performance analysis was performed by mean of Computational Fluid Dynamics (CFD) and it was found that a maximum of 76% of total-static efficiency ηt-s can be achieved at design speed.
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Stock, Alexander, Johannes Teigelkotter, Stefan Staudt, and Thomas Kowalski. "The doubly fed permanent magnet synchronous machine as a highly efficient drive system for constant speed applications." In 2015 IEEE 11th International Conference on Power Electronics and Drive Systems. IEEE, 2015. http://dx.doi.org/10.1109/peds.2015.7203399.

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Pongpant, Jutarat, Sakorn Po-ngam, and Mongkol Konghirun. "The Performance Improvement of Constant V/f Control of Induction Motor Drive in Low Speed Range." In TENCON 2006 - 2006 IEEE Region 10 Conference. IEEE, 2006. http://dx.doi.org/10.1109/tencon.2006.344153.

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Reports on the topic "Constant speed drive (CSD)"

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Olson, R., K. Anderson, S. Ng, B. Dishner, and C. Ferreira. Electrically Compensated Constant Speed Drive (Model Number 60 ECEPGS 02). Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada206064.

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Ghanipoor Machiani, Sahar, Aryan Sohrabi, and Arash Jahangiri. Impact of Regular and Narrow AV-Exclusive Lanes on Manual Driver Behavior. Mineta Transportation Institute, 2020. http://dx.doi.org/10.31979/mti.2020.1922.

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This study attempts to answer the question of how a narrow (9-ft) lane dedicated to Automated Vehicles (AVs) would affect the behavior of drivers in the adjacent lane to the right. To this end, a custom driving simulator environment was designed mimicking the Interstate 15 smart corridor in San Diego. A group of participants was assigned to drive next to the simulated 9-ft narrow lane while a control group was assigned to drive next to a regular 12-ft AV lane. Driver behavior was analyzed by measuring the mean lane position, mean speed, and mental effort (self-reported/subjective measure). In addition to AV lane width, the experimental design took into consideration AV headway, gender, and right lane traffic to investigate possible interaction effects. The results showed no significant differences in the speed and mental effort of drivers while indicating significant differences in lane positioning. Although the overall effect of AV lane width was not significant, there were some significant interaction effects between lane width and other factors (i.e., driver gender and presence of traffic on the next regular lane to the right). Across all the significant interactions, there was no case in which those factors stayed constant while AV lane width changed between the groups, indicating that the significant difference stemmed from the other factors rather than the lane width. However, the trend observed was that drivers driving next to the 12-ft lane had better lane centering compared to the 9ft lane. The analysis also showed that while in general female drivers tended to drive further away from the 9-ft lane and performed worse in terms of lane centering, they performed better than male drivers when right-lane traffic was present. This study contributes to understanding the behavioral impacts of infrastructure adaptation to AVs on non-AV drivers.
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