Journal articles: 'Torque-speed curve'

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Aree, Pichai. "Analytical determination of speed-torque and speed-current curves of single-cage induction motor under supply voltage and frequency variations." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 6 (November 5, 2018): 2279–98. http://dx.doi.org/10.1108/compel-09-2017-0404.

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Purpose An important characteristic of most induction motors is speed- or slip-torque curve. A simplified Kloss formula is widely used for describing speed-torque characteristic because it is fairly simple. Only two parameters related to break-down torque and break-down slip are regarded as input parameters. Because this simplified formula ignores an unknown parameter that is a ratio between Thevenin’s and rotor resistances, an accurate torque curve characteristic may not be fully obtained over an entire speed range. Moreover, the conventional Kloss formula does not offer a speed-torque curve calculation when motor’s supply voltages and frequencies are deviated from rated values. Hence, the purpose of this paper is to present an extension of Kloss formula, which allows a more precise estimation of speed-torque and speed-current curves of single-cage three-phase induction motors over a wide range of speeds at different motor’s operating voltages, frequencies and rotor-circuit resistances. Design/methodology/approach The analytical approach is mainly used for determining all key parameters in the Kloss formula using a known set of data such as rated torque, starting torque, break-down torque and rated speed, in which they can be obtained from motor’s manufacturer. Findings The speed-torque and speed-current curves taken from laboratory measurements are compared with those from the calculations. Good agreements between them are fully observed. Originality/value This analytical approach is useful in providing an accurate speed-torque and speed-current curves required for most steady-state analysis.

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Chan, T. F. "Determination of the Torque-Speed Characteristic of an Induction Motor Using a Curve-Fitting Technique." International Journal of Electrical Engineering & Education 30, no. 4 (October 1993): 360–65. http://dx.doi.org/10.1177/002072099303000410.

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Determination of the torque-speed characteristic of an induction motor using a curve-fitting technique This paper describes the use of a curve-fitting technique to deduce the nominal torque-speed characteristic of a three-phase induction motor from the speed data obtained in a no-load acceleration test. Experimental results show that the fitted curve is reasonably close to the torque-speed characteristic obtained from an actual load test.

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Wang, Gui Juan. "The Experimental Study on "Soft Start" of Mine Permanent Magnet Coupling." Applied Mechanics and Materials 727-728 (January 2015): 403–5. http://dx.doi.org/10.4028/www.scientific.net/amm.727-728.403.

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The "soft start" problem was studied for magnetic coupling in coal mine by experimental method. At first, the starting condition of magnetic coupling was analysed. Aaccording to the load characteristics of conveyor. Secondly, the torque characteristic curve, speed characteristic curve and current starting curve were plotted using the experimental data. From three kinds of characteristic curve we have conclusion that the output torque and output speed is much less than the input torque and input speed, the starting current value with the load was less than the starting current value when directly connected. That means magnetic coupling with the soft start characteristic.

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Martinez-Roman, J., and L. Serrano-Iribarnegaray. "Determining torque–speed curve of two-speed deep cage lift asynchronous machines." IEE Proceedings - Electric Power Applications 152, no. 3 (2005): 455. http://dx.doi.org/10.1049/ip-epa:20040988.

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Nord, Ashley L., Yoshiyuki Sowa, Bradley C. Steel, Chien-Jung Lo, and Richard M. Berry. "Speed of the bacterial flagellar motor near zero load depends on the number of stator units." Proceedings of the National Academy of Sciences 114, no. 44 (October 16, 2017): 11603–8. http://dx.doi.org/10.1073/pnas.1708054114.

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The bacterial flagellar motor (BFM) rotates hundreds of times per second to propel bacteria driven by an electrochemical ion gradient. The motor consists of a rotor 50 nm in diameter surrounded by up to 11 ion-conducting stator units, which exchange between motors and a membrane-bound pool. Measurements of the torque–speed relationship guide the development of models of the motor mechanism. In contrast to previous reports that speed near zero torque is independent of the number of stator units, we observe multiple speeds that we attribute to different numbers of units near zero torque in both Na+- and H+-driven motors. We measure the full torque–speed relationship of one and two H+units inEscherichia coliby selecting the number of H+units and controlling the number of Na+units in hybrid motors. These experiments confirm that speed near zero torque in H+-driven motors increases with the stator number. We also measured 75 torque–speed curves for Na+-driven chimeric motors at different ion-motive force and stator number. Torque and speed were proportional to ion-motive force and number of stator units at all loads, allowing all 77 measured torque–speed curves to be collapsed onto a single curve by simple rescaling.

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Li, Qiang, and Chang Gao Xia. "Research of Electric Power Steering System Assistance Characteristic Based on the Identification of the Road." Advanced Materials Research 756-759 (September 2013): 4401–6. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4401.

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Study of traditional assist characteristic cure does not take into account the difference of steering resistance torque caused by different road adhesion coefficient. Vehicle dynamics analysis model is established based on ADAMS/CAR. Simulation of steering wheel torque is realized under different road conditions. Departure from the ideal boost characteristics requirements and combined with ideal steering wheel torque under different speed and lateral acceleration., the article built assist characteristic curve under a certain road conditions. The system can real-time select the assist characteristic curve through identifying the vehicle traveling road conditions by the way of BP neural network. The theory provided a feasible method for the improvement of the EPS system performance.

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Menegaldo, Luciano Luporini, Lyon Aragão, Thiago Matta, and Liliam Fernandes de Oliveira. "Hip Adduction and Abduction Torque-angle Curve Characterization of Speed Skating Athletes." International Journal of Sports Medicine 41, no. 04 (January 14, 2020): 248–54. http://dx.doi.org/10.1055/a-1073-7754.

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Abstract Speed skating is a cyclic sport which involves the hip abductor muscles, impelling the participant forwards, and adductor muscles, in the recovery phase and decelerating the abduction movement eccentrically. This paper has the objective of describing and comparing the abduction/adduction torque-angle curves of speed skating athletes (N=10) with a group of non-practitioners young participants (N=10). Both groups presented similar peak torques and electromyography patterns for tensor fascia lata, gluteus medius, long adductor and adductor magnus. However, athletes showed higher torque-angle curve integral and abduction and adduction peak torques at different hip angles than the control group. These findings suggest an adaptation of their musculotendon actuators and a better capacity to generate mechanical work and power during a propulsion-recovery cycle.

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Wang, Guang Ping, Qing Nian Wang, Peng Yu Wang, and Wen Wang. "Engine Control of Power-Split Hybrid Vehicle." Applied Mechanics and Materials 392 (September 2013): 267–71. http://dx.doi.org/10.4028/www.scientific.net/amm.392.267.

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Planetary power-split hybrid vehicle is a very common structure of hybrid electric vehicle (HEV), which achieves speed and torque double decoupled between engine and wheels. Engine always working on optimal curve is an important reason for low fuel-efficient. Engine speed is controlled by PID, and the optimal loading rate of engine is solved from engine characteristic curves; finally realization of engine working on optimal curve. Offline simulation is used for this algorithm, and comparing with many experimental results demonstrates engine works on operating point; fuel consumption is close to the official fuel consumption of Prius.

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Yates, J. W., and William J. Armbruster. "53 SPEED SPECIFIC ECCENTRIC TRAINING AND THE TORQUE-VELOCITY (T-V) CURVE." Medicine & Science in Sports & Exercise 22, no. 2 (April 1990): S9. http://dx.doi.org/10.1249/00005768-199004000-00053.

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Sakamoto, Yoshinori, Koichi Murakami, and Shinki Kikuchi. "A method for calculating the torque-speed curve of parametric induction motor." Electrical Engineering in Japan 105, no. 4 (1985): 53–60. http://dx.doi.org/10.1002/eej.4391050407.

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Pang, Xinyu, Xuanyi Xue, and Xiaowu Jin. "Experimental study on wear life of journal bearings in the rotor system subjected to torque." Transactions of the Canadian Society for Mechanical Engineering 44, no. 2 (June 1, 2020): 272–78. http://dx.doi.org/10.1139/tcsme-2019-0035.

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In the rotor system subjected to torque, the lubrication state of the journal bearings will change, which can lead to wear life change of such bearings. Therefore, the experimental study on the wear life prediction of the journal bearings in the rotor system subjected to torque was carried out. An improved Archard model for wear rate prediction was proposed, which can be applied to determine the relationship among speed, torque, and wear of different bearings. The 20 h wear of a single-span rotor system was tested at three speeds and torque. Test results show that the impact of torque on wear is greater than that of speed. The wear life of a bearing can be predicted with determined wear threshold. The 20 h wear was calculated by using the wear data of the rotor test bench in this model and compared with the actual wear. The comparison results indicate that the accuracy is higher than 92%. The torque – wear life curve shows that wear life is logarithmic to torque at a constant speed and significantly affected by changes in the low torque. Given a constant torque, the wear life will decrease logarithmically with the speed increasing.

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Shi, Guo Biao, Jin Long Cui, and Peng Gu. "Matching Design of Assist Characteristic for Electric Hydraulic Power Steering System of Electric Bus." Applied Mechanics and Materials 427-429 (September 2013): 235–40. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.235.

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Electric hydraulic power steering system (EHPS) has the characteristics of high energy efficiency and reliability. In this paper, we focus on the design and analysis of assist characteristic for EHPS of electric bus. The relationship of steering assist power, steering wheel torque and steering resisting torque was analyzed; steering system model and vehicle dynamic model were built. By EHPS simulation, the relationship of pump flow rate, steering wheel angular velocity and vehicle speed was deduced and 3-D assist characteristic curve map was plotted, which was suitable for electric bus. In order to apply the assist characteristic curve into practice, we optimized the curve through BP neural network, and then obtained the assist power value under any vehicle speed and steering wheel angular velocity. Finally, EHPS simulation verified the optimized assist characteristic curve having a good performance.

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Aree, Pichai. "Analytical Approach to Determine Speed-torque Curve of Induction Motor from Manufacturer Data." Procedia Computer Science 86 (2016): 293–96. http://dx.doi.org/10.1016/j.procs.2016.05.076.

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Grenčík, Juraj, and Yoshihiro Suda. "Enhanced Curving Performance of Unsymmetric Suspension Trucks with Semiactive Control Concept Even under Acting Traction/Brake Torque." Journal of Robotics and Mechatronics 7, no. 4 (August 20, 1995): 324–28. http://dx.doi.org/10.20965/jrm.1995.p0324.

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In this paper, dynamic behavior of rail vehicles during curve negotiation when traction or brake torque is applied has been studied. Vehicles with conventional symmetric trucks are compared to those with the recently proposed trucks having longitudinally unsymmetric suspension characteristics. Computer simulations using full car body models considering non-linear characteristics of the contact force between wheel and rail are performed. Wheel lateral displacement and wheel attack angle are calculated to describe curving performance under different speed, curve radius, and vehicle load. Under the same curve conditions, wheel lateral displacement is considerably smaller and wheel attack angle is almost zero within wide range of torque, while growing from higher value in case of conventional truck design. Consequently, enhanced curving performance of new unsymmetric trucks even under acting traction/braking torque is proved.

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Lu, Xin Jian, Si Hong Zhu, Zun Mang Ke, Jian Qin, and Shao Wei. "Influence of Crank Radius on the Curve Shapes for a Multi-Link High-Speed Precision Press." Applied Mechanics and Materials 141 (November 2011): 313–18. http://dx.doi.org/10.4028/www.scientific.net/amm.141.313.

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The parameterized dynamic simulation model for a multi-link high precision press has been established in the ADAMS software environment based on the displacement equations. The press being developed is taken as an example to study the slider’s displacement curves, velocity curves and acceleration curves under different crank radius in practice as well as the working angle curves and torque curves. With the crank radius increasing, the started punching angle comes early and the slider’s velocity and acceleration at bottom dead center (B.D.C) decreases significantly which help to improve the accuracy of B.D.C and to lower the torque consumption during stamping. Meanwhile, the increasing of working angle helps to reduce the lateral force acting on the slider, such as the torque required to overcome the inertial forces increases rapidly, the torque needed to overcome the nominal force decreases and the peak of nominal force shifts to the lower left gradually. Results of the research mentioned above are helpful to develop the multi-link high-speed press.

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Qi, Yayun, and Huanyun Dai. "Influence of motor harmonic torque on wheel wear in high-speed trains." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 234, no. 1 (February 21, 2019): 32–42. http://dx.doi.org/10.1177/0954409719830808.

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With the increase of train speed, the harmonic torque of the traction motor of a high-speed train is not a negligible source of excitation. In order to explore the influence of the harmonic torque of the motor on wheel wear, a high-speed EMU vehicle model was established based on the multibody dynamics theory. FASTSIM was used to calculate the wear parameters, and the Zobory wear model was used to calculate the depth of the wheel wear. The influence of the harmonic torque of the motor on the wear parameters and wear depth of high-speed trains under straight and curve conditions is calculated, respectively. The simulation results show that the harmonic torque has a large influence on the wheel rail vertical force and the longitudinal creep force and has little influence on the lateral creep force. With the 30% harmonic torque, the wheel rail vertical force increases by 7.6%, the longitudinal creep force increases by 15%, and the lateral creep force increases by 4%. The amplitude of the longitudinal creepage increases by 14.2% when the harmonic torque is 10%, and increases by 34.4% when the harmonic torque is 30%. When the harmonic torque increases, the wheel wear depth increases, the 10% harmonic torque increases by 3% and the 30% harmonic torque increases by 8%, and the increase of the motor harmonic component accelerates the wheel wear. At the same time, small longitudinal positioning stiffness can help to reduce the influence of the harmonic torque, and the selection of the longitudinal positioning stiffness needs to consider the dynamic performance of the vehicle.

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Wang, Wei, Shuhong Wang, Yibo Zhang, and Libo Liang. "Study on Magnetic Flux Weakening Control Strategy of Interior Permanent Magnet Synchronous Motor." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 36, no. 5 (October 2018): 970–77. http://dx.doi.org/10.1051/jnwpu/20183650970.

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When the maximum ratio of torque to current strategy is used for IPMSM flux weakening speed regulation, it is needed to solve nonlinear High-Order equations determining the direct and quadrature axis current given value. Facing this problem, the paper used the curve fitting and obtained the given current, improved the control accuracy of the system. At the same time, in the weak magnetic high speed zone, proposed a new over-modulation control algorithm, which through the optimization of voltage vector and phase, achieved a natural transition of different modulation region, increased the output voltage of the inverter, and enhanced the stator voltage and output torque when motor runs at a certain speed given value, expanded steady weak magnetic region of IPMSM when the load torque is certain.

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Han, Katherine. "Can Physics Help Athletes Run Faster on a Curve Track." International Journal of Physical Education, Fitness and Sports 7, no. 3 (September 26, 2018): 24–31. http://dx.doi.org/10.26524/ijpefs1833.

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Sprinting on a curve is slower than sprinting on a straight lane. To explain this phenomenon, various models based on a combination of biological and physical assumptions have been developed. These models depend on detailed parameters that significantly differ for each individual athlete. Here, we propose a general model solely based on kinetic theory of physics that can be universally applied to all athletes. By solving the force and torque equations for the running speed of the athletes on a curved track, we analyzed sprinting speeds between the inner and outer curves. Applying the data from the classic works into our models, we find that our results and conclusions are mostly aligned with the previous works while our approach is built on the accurate physics principles and contains no uncontrollable parameters. Further we show how runners can alleviate the centrifugal effect of curved track by tilting their bodies and we quantitatively determine the optimal tilting angle for a given curvature.

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Zeng, Qi, and Long Hu Fu. "Study on the Effects of Compressed Natural Gas on Engine Performances." Advanced Materials Research 1030-1032 (September 2014): 1242–46. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.1242.

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Engine bench test research has been done on a JL4JB1 diesel engine fueled with compressed natural gas (CNG), and the power performance, load performance and universal performance were obtained, analyzing the performance changing regulations of CNG engine. The results indicate that the maximum torque turns up at the medium speed when the engine operates at power performance points, and the minimum brake specific gas consumption (BSGC) also comes up at medium speed. When the rotating speed keeps constant, BSGC decreases with the torque increasing, and decreasing largely at small load while a little at high load. From the universal performance curve of CNG engine, we can know that the minimum BSGC is 194g/kW·h.

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Huang, Yuan Mao, and Bi Shyang Hu. "Minimum Fuel Consumption and CO Emission and Optimum Speed of the Motorcycle with a CVT." Journal of Energy Resources Technology 125, no. 4 (November 18, 2003): 311–17. http://dx.doi.org/10.1115/1.1625395.

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The simulated annealing algorithm with the Bessel method for curve fitting and the tensor product method for surface fitting is used to transform engine discrete experimental data into a form that enables these data to be incorporated in the optimization process. Optimum curves of the engine torque versus the engine rotational speed and the engine rotational speed versus the motorcycle speed for the fuel consumption and the carbon monoxide (CO) emission are obtained for a motorcycle with a continuously variable transmission (CVT). The engine rotational speed at which a motorcycle begins to move for the specific engine data is obtained. From design parameters, engine rotational speeds corresponding to the maximum and minimum CVT speed ratio change, the minimum fuel consumption and CO emission, and optimum design variables can be determined.

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Chen, Yi, and Jun Liu. "Research on Control Strategy of Differential Assisted Steering of Distributed Drive Electric Vehicle." Applied Mechanics and Materials 431 (October 2013): 241–46. http://dx.doi.org/10.4028/www.scientific.net/amm.431.241.

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The distributed drive electric vehicle was studied in this paper. According to the advantages of the controllable and accurate wheel speed and torque the ideal differential assisted characteristic curve was designed under different vehicle speed as well as a control strategy for differential power steering, a vehicle dynamics model based on CarSim/Simulink and simulation experiments were conducted. The experimental results indicated that on the premise to guarantee the road feeling, the control strategy for differential power steering decreased the steering wheel torque, angle and reduced driver's work-load , improved markedly the steering portability of the distributed drive electric vehicle.

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Li, Ling Ling, Guang Pu Xu, Yong Ling Kang, and Xue Dong Ma. "Simulation Calculation of Tilting Torque for Mixed Iron Car." Advanced Materials Research 421 (December 2011): 267–70. http://dx.doi.org/10.4028/www.scientific.net/amr.421.267.

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Tilting torque of mixed iron car is an important parameter in designing tilting mechanism. In the past, calculating tilting torque of the mixed iron car mostly depended on manual calculation with low calculating speed and calculating precision. This paper adopts Solidworks software to simulate and calculate tilting torque of the 300t mixed iron car, and overcome the above drawbacks. According to the calculating, the tilting torque’s curve can be obtained, which provides a theoretical reference for determining power of tilting motor, designing tilting mechanism and judging the tilting safety.

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Tao, Chen, Zhe Ming Chen, Ze Hao Huang, and Chen Long. "The Analysis and Calculation of the Spiral Bevel Gears Transmission System of High-Speed Train." Applied Mechanics and Materials 490-491 (January 2014): 1126–33. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.1126.

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The overview and analysis of the structure of spiral bevel gear transmission system was presented . The characteristics of transmission and torque of the system were analysis and calculated . Based on high-speed trains operating conditions. The issue that tooth contact of the positive invertion of spiral bevel gear was analysis. The consistency of the positive invertion was desirable. The error curve of the transmission was downward consistently and the curves which were adjacent intersect. The less of the vibration of bridge contacts won`t be happened.

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Wang, Lei, Shan Zuo, Y. D. Song, and Zheng Zhou. "Variable Torque Control of Offshore Wind Turbine on Spar Floating Platform Using Advanced RBF Neural Network." Abstract and Applied Analysis 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/903493.

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Offshore floating wind turbine (OFWT) has been a challenging research spot because of the high-quality wind power and complex load environment. This paper focuses on the research of variable torque control of offshore wind turbine on Spar floating platform. The control objective in below-rated wind speed region is to optimize the output power by tracking the optimal tip-speed ratio and ideal power curve. Aiming at the external disturbances and nonlinear uncertain dynamic systems of OFWT because of the proximity to load centers and strong wave coupling, this paper proposes an advanced radial basis function (RBF) neural network approach for torque control of OFWT system at speeds lower than rated wind speed. The robust RBF neural network weight adaptive rules are acquired based on the Lyapunov stability analysis. The proposed control approach is tested and compared with the NREL baseline controller using the “NREL offshore 5 MW wind turbine” model mounted on a Spar floating platform run on FAST and Matlab/Simulink, operating in the below-rated wind speed condition. The simulation results show a better performance in tracking the optimal output power curve, therefore, completing the maximum wind energy utilization.

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Pang, Xinyu, Wangwang Jiang, and Xiaowu Jin. "Investigation on Lubrication State of Sliding Bearings in Low-Speed Rotor System Subjected to Torque Load." International Journal of Rotating Machinery 2019 (July 1, 2019): 1–11. http://dx.doi.org/10.1155/2019/1791830.

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In order to study the influence of torque load on the lubrication and wear of the sliding bearing of the rigid rotor system, the theoretical and experimental researches on the single-span rotor system with low speed were carried out. A special force sensor was used to measure the bearing load under different torque excitations, and the oil film pressure was calculated. The oil film pressure and thickness of sliding bearing under low speed (210r/min) were simulated by combining the lubrication theory. Based on the film thickness ratio theory, the corresponding relationship between the lubrication state and the torque load value was deduced. In addition, the wear rate and abrasive grain morphology of sliding bearing with different torque values were analyzed by means of oil sample preparation to verify this correspondence. The results show that the film thickness ratio has a logarithmic function relationship with the constant torque load, and the film thickness ratio curve can be used to determine the corresponding torque values under different lubrication states. The wear rate under mixed lubrication state increases exponentially with the torque load, and the main wear mechanism is adhesive wear and abrasive wear. The research results have certain guiding significance to the adjustment of the actual running condition of sliding bearing and its life prediction.

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Yan, H.-S., and C.-C. Yeh. "Integrated kinematic and dynamic designs for variable-speed plate cam mechanisms." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 1 (June 11, 2010): 194–203. http://dx.doi.org/10.1243/09544062jmes2321.

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This work presents a systematic approach to improve the kinematic and dynamic characteristics of plate cam mechanisms by using the Bezier curve as the input speed trajectory. The analytical models of kinematic and dynamic designs for a variable-speed plate cam mechanism are derived first. Speed trajectories of the cam are obtained by employing the Bezier curve. Then, an approach to integrate kinematic and dynamic designs for motion adaptation and to reduce the input torque at the same time based on multi-objective optimization is proposed. Two examples are provided for the design models to illustrate the design process. Finally, an experimental set-up is established, and the data of related characteristics is measured to verify the proposed design for variable-speed plate cam mechanisms.

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Dida, Abdelhak, and Djilani Benattous. "Doubly-Fed Induction Generator Drive System Based on Maximum Power Curve Searching using Fuzzy Logic Controller." International Journal of Power Electronics and Drive Systems (IJPEDS) 5, no. 4 (April 1, 2015): 583. http://dx.doi.org/10.11591/ijpeds.v5.i4.pp583-594.

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This paper proposes a novel variable speed control algorithm for a grid connected doubly-fed induction generator (DFIG) system. The main objective is to track the maximum power curve characteristic by using an adaptive fuzzy logic controller, and to compare it with the conventional optimal torque control method for large inertia wind turbines. The role of the FLC is to adapt the transfer function of the harvested mechanical power controller according to the operating point in variable wind speed. The control system has two sub-systems for the rotor side and the grid side converters (RSC, GSC). Active and reactive power control of the back-to-back converters has been achieved indirectly by controlling q-axis and d-axis current components. The main function of the RSC controllers is to track the maximum power through controlling the electromagnetic torque of the wind turbine. The GSC controls the DC-link voltage, and guarantees unity power factor between the GSC and the grid. The proposed system is developed and tested in MATLAB/SimPowerSystem (SPS) environment.

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Yao, Qing Hua, and Miao Cao. "Research of Vector Control for Asynchronous Motor System Based on MRAS." Key Engineering Materials 531-532 (December 2012): 769–72. http://dx.doi.org/10.4028/www.scientific.net/kem.531-532.769.

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A new speed-adjustment approach of vector control for asynchronous motor is presented in the paper based on MRAS, It adopts a rotate speed calculating module which is designed specifically replaced Conventional rotate speed detecting system. The approach overcomes some shortcomings that comes from the precision and installation of rotate speed sensor. Motor rotate speed and torque curve are observed under different parameters based on MATLAB, and are analysed statically and dynamically. Simulation result showed touque ripple of this speed-adjustment system is small and timing is smooth, which can satisfy the demand of most electric equipment for speed-adjustment performance. Simulation result can realize asynchronous motor Control effectively.

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Komaladewi, A. A. I. A. Sri, I. Gusti Agung Kade Suriadi, and I. Ketut Adi Atmika. "Geometric Progression Application in Design Transmission Gear Ratio." Applied Mechanics and Materials 776 (July 2015): 343–48. http://dx.doi.org/10.4028/www.scientific.net/amm.776.343.

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One of the important aspects in determining the competitiveness of an automotive product is the traction ability or performance, the vehicle's ability to accelerate, wind resistance, rolling resistance, against the force of the ramp, and the capacity to pull a load. The size of traction for any level of gear and vehicle speed that can be achieved can be controlled by adjusting the ratio and transmission rate. Transmission ratio affects the amount of torque that can be transmitted, while the number of speed levels affects the fineness of the process of transmission and transformation of power in the transmission system. To find a gear ratio between the lowest and highest transmission rate is by geometric progression. The basis of the use of this method is to get the ratio and amount of gear transmission rate of speed at the same engine operating speed so that fuel economy will be the same on each transmission. Modified gear ratio produce traction curve where the distance curve closer adjacent transmission. This indicates a loss of power transmission shifting is getting smaller or in other words the better traction performance. The design of the installation ratio 6-speed, generating traction curve with the distance between the curve near the sting traction, produces good traction or good performance.

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ANDRYCH-ZALEWSKA, Monika, Zdzisław CHŁOPEK, Jerzy MERKISZ, and Jacek PIELECHA. "Exhaust emission from a vehicle engine operating in dynamic states and conditions corresponding to real driving." Combustion Engines 178, no. 3 (July 1, 2019): 99–105. http://dx.doi.org/10.19206/ce-2019-317.

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The article presents the exhaust emission results from a diesel engine in dynamic states of engine operation in the driving tests: NEDC (New European Driving Cycle) and Malta test, developed at the Poznan University of Technology. The NEDC and Malta tests were carried out as simulations on the engine test bench mimicking the driving tests conditions. The test results of the emission of carbon monoxide, hydrocarbons and nitrogen oxides obtained in each of the tests were presented. The dynamic states have been classified de-pending on the time derivative value of the torque and engine rotational speed. Both the positive and negative as well as zero time deriv-ative values of torque and rotational speed were considered. Therefore, overall six types of dynamic states were analyzed. A high sensi-tivity of exhaust emission to various types of dynamic states was found. The exhaust emission sensitivity to dynamic states in the Malta test was found to be higher than for the NEDC test, although these tests have similar properties (average rotational speed and average torque). This is due to the fact that the NEDC test is created on the basis of the similarity of zero-dimensional characteristics of the cars speed characteristic, whereas the Malta test was designed in accordance with the principle of faithful representation in the time domain of the NEDC speed curve.

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Shadley, J. R., B. L. Wilson, and M. S. Dorney. "Unstable Self-Excitation of Torsional Vibration in AC Induction Motor Driven Rotational Systems." Journal of Vibration and Acoustics 114, no. 2 (April 1, 1992): 226–31. http://dx.doi.org/10.1115/1.2930252.

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The most common NEMA Design Classes of AC induction motors have speed-torque characteristics that can give rise to unstable self-excitation of torsional vibration in rotational systems during start-up. A torsional vibration computational model for start-up transients has been developed as a design tool for induction motor applications. Torsional instability can occur at speeds in the positive sloping segment of the motor’s speed-torque curve and is particularly acute when the mass moment of inertia of the load device is more than two times the mass moment of inertia of the motor rotor. The computational model is compared with an exact solution method and with a laboratory test of a motor-driven inertial load. Applications of the computational model to electric submersible pump (ESP) design cases are discussed.

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Fu, Zhumu, Aiyun Gao, Xiaohong Wang, and Xiaona Song. "Torque Split Strategy for Parallel Hybrid Electric Vehicles with an Integrated Starter Generator." Discrete Dynamics in Nature and Society 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/793864.

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This paper presents a torque split strategy for parallel hybrid electric vehicles with an integrated starter generator (ISG-PHEV) by using fuzzy logic control. By combining the efficiency map and the optimum torque curve of the internal combustion engine (ICE) with the state of charge (SOC) of the batteries, the torque split strategy is designed, which manages the ICE within its peak efficiency region. Taking the quantified ICE torque, the quantified SOC of the batteries, and the quantified ICE speed as inputs, and regarding the output torque demanded on the ICE as an output, a fuzzy logic controller (FLC) with relevant fuzzy rules has been developed to determine the optimal torque distribution among the ICE, the ISG, and the electric motor/generator (EMG) effectively. The simulation results reveal that, compared with the conventional torque control strategy which uses rule-based controller (RBC) in different driving cycles, the proposed FLC improves the fuel economy of the ISG-PHEV, increases the efficiency of the ICE, and maintains batteries SOC within its operation range more availably.

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Xue, Long, Rong Rong Zhang, Wei Zong, Jia Feng Song, and Meng Zou. "Bionic Design for Mars Sampling Scoop Inspired by Himalayan Marmot Claw." Applied Bionics and Biomechanics 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/5713683.

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Cave animals are often adapted to digging and life underground, with claw toes similar in structure and function to a sampling scoop. In this paper, the clawed toes of the Himalayan marmot were selected as a biological prototype for bionic research. Based on geometric parameter optimization of the clawed toes, a bionic sampling scoop for use on Mars was designed. Using a 3D laser scanner, the point cloud data of the second front claw toe was acquired. Parametric equations and contour curves for the claw were then built with cubic polynomial fitting. We obtained 18 characteristic curve equations for the internal and external contours of the claw. A bionic sampling scoop was designed according to the structural parameters of Curiosity’s sampling shovel and the contours of the Himalayan marmot’s claw. Verifying test results showed that when the penetration angle was 45° and the sampling speed was 0.33 r/min, the bionic sampling scoops’ resistance torque was 49.6% less than that of the prototype sampling scoop. When the penetration angle was 60° and the sampling speed was 0.22 r/min, the resistance torque of the bionic sampling scoop was 28.8% lower than that of the prototype sampling scoop.

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Wu, Jing Bing, Xie Wang, and Lun Shu. "Data Acquisition System Based on VC++." Applied Mechanics and Materials 109 (October 2011): 720–24. http://dx.doi.org/10.4028/www.scientific.net/amm.109.720.

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In this paper, we introduced features of data acquisition card based on PCI bus, and combined with researching on timing data collection system in the reducer test, built data acquisition system aiming at parameters of the reducer, and by using VC+ + to program, we achieved display on timing and real-time acquisition curve of data of torque and speed of the reducer, and have got good results.

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Xu, Guangju, Yang Zhao, Mingdi Li, Yanbin Hu, and Ling Lin. "Effect of Lubricant Additives on the Oxidation Characteristics of Diesel Engine Particulate Matter." International Journal of Chemical Engineering 2020 (November 24, 2020): 1–9. http://dx.doi.org/10.1155/2020/8867515.

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Three common lubricant additives, including an antioxidant, detergent, and an antifoamer, were added to diesel fuel to perform a diesel engine bench test. Particulate matter samples underwent thermogravimetric analysis to investigate the effect of lubricant additives on the particulate matter oxidation process, characteristic temperature, and activation energy. The results showed the following. Different lubricant additives result in different variation trends in the thermogravimetric curve of a particulate matter sample by varying the rotating speed and torque. When the rotating speed was stable, as the torque increased, the ignition temperature of the particulate matter of Fuel C declined rapidly during the initial stage and then increased rapidly. When the torque was stable, as the rotating speed increased, the ignition temperature of the particulate matter of Fuel C increased initially and then declined. The particulate matter of Fuel C had the lowest level of activation energy at approximately 57.89 J·mol−1. The particulate matter of Fuel A had the highest level of activation energy at approximately 74.10 J·mol−1. When the fuel has a higher cetane number, the combustion chemical reaction rate is faster and results in a more complete reaction. The active substance contact surface increases, which facilitates particulate matter oxidation.

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36

Nouria, Nair, Gasbaoui Brahim Ghazouni Abdelkader, and Benoudjafer Cherif. "Improved DTC strategy of an electric vehicle with four in-wheels induction motor drive 4WDEV using fuzzy logic control." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 2 (June 1, 2021): 650. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp650-661.

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In this paper, we will study a four-wheel drive electric vehicle (4WDEV)with two control strategies: conventional direct torque control CDTC and DTC based on fuzzy logic (DTFC). Our overall idea in this work is to show that the 4WDEV equipped with four induction motors providing the drive of the driving wheels controlled by the direct fuzzy torque control ensures good stability of the 4WDEV in the different topologies of the road, bends and slopes. and increases the range of the electric vehicle. Numerical simulations were performed on an electric vehicle powered by four 15 kW induction motors integrated into the wheels using the MATLAB / Simulink environment, where the reference speeds of each wheel (front and rear) are obtained using an electronic speed differential (ESD). This can eventually cause it to synchronize the wheel speeds in any curve. The speed of each wheel is controlled by two types of PI and FLC controllers to improve stability and speed response (in terms of setpoint tracking, disturbance rejection and climb time). Simulation results show that the proposed FLC control strategy reduces torque, flux and stator current ripple. While the4WDEV range was improved throughout the driving cycle and battery power consumption was reduced.

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Zhang, Lei, Xiu Min Yang, Tao Wei, and Ying Di Shi. "The Working Mechanism and Control Method of GL160C Metal Belt CVT." Advanced Materials Research 139-141 (October 2010): 1856–59. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1856.

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On the foundation of the analysis of the working mechanism of the GL160C continuously variable transmission (CVT), the mathematical model of the axial clamping force of the driving and driven pulleys are constructed. The relationship between the pressure of the driving and driven cylinders and the speed ratio of the CVT are derived while the CVT is transmitting the unit torque. The control method of the axial clamping force between the driving and driven pulleys, the control model of the CVT speed ratio are given. The following conclusions are drawn from the bench test and integral vehicle test: the acceleration performance and the stability of the speed ratio of the GL160C CVT are good, the power output is stable and reliable, the controller could achieve every functional requirement, all of which could guarantee that the output of the engine could run as the designed ideal dynamic curve and the ideal economical curve.

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Zhang, Zhigang, Ling Zou, Hang Liu, Jin Feng, and Zhige Chen. "Response Characteristics of Dynamic Torque for Wet Clutch Engagement: A Numerical and Experimental Study." Shock and Vibration 2021 (May 17, 2021): 1–9. http://dx.doi.org/10.1155/2021/5522998.

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To determine the factors affecting the dynamic transmitted torque response characteristics of the wet clutch, the oil film pressure, the asperity contact pressure, the applied pressure, and the dynamic transmitted torque model were established, using the fourth-order Runge–Kutta numerical method to couple the oil film thickness and the speed difference to obtain the change curve of the joint pressure and the transmitted torque. The established model was used to study the influence of the pressure hysteresis time, lubricant viscosity, friction lining permeability, friction pair equivalent elastic modulus, and surface combined roughness RMS on the dynamic transmitted torque response during the wet clutch engagement. The results indicate that the longer the pressure hysteresis time, the smaller the permeability of the friction lining, the smaller the equivalent elastic modulus, the greater surface combined roughness RMS, the more delayed the response of the transmitted torque, and the smaller the level of jerk of the wet clutch engagement. Also, the lower the lubricant viscosity, the greater the permeability of the friction lining, and the smaller the equivalent elastic modulus is and the greater surface combined roughness RMS is, the more sensitive the transmitted torque response is to pressure response changes.

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Montúfar Paz, Paúl Alejandro, Franklin Willian Tigse Ushiña, and Nelson Ruverli Coronel Andrade. "Caracterización del convertidor de par y su influencia sobre el desempeño del vehículo e implementación de instrumentación y visualización de variables principales de operación para la carrera de ingeniería automotriz." Revista de Investigaciones en Energía, Medio Ambiente y Tecnología: RIEMAT ISSN: 2588-0721 2, no. 2 (December 15, 2017): 16. http://dx.doi.org/10.33936/riemat.v2i2.1139.

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The torque converter into the automatic drivetrain has been quite important as well as the hydraulic clutches due to the capacity of amplifying the torque highly accurate over 98% of low RPM, working as attachment of 1:1in high RPM, to get a better efficiency and low gas intake for saving the environment. Because of its desing and fuction, the torque converter engages and disengages automatically the power of the engine to the gear, focusing on the engine RPM. With the powertrain on, at an idling speed, the power is weak due to the lack of fluid flow; However when speeding up, the powertrain gets stronger through the torque converter job. This research aims on the torque converter features based on the main variables. The first one was a test on the dynamometer for finding the torque and power curve, and the second one, an intake test. This study was made at CCICEV in order to understand how the torque converter works in automatic vehicles. A didactic board was built for seeing the torque graphics, power and slippery of the converter in order to verify possible damage in advance. This research was pretty important for the Automotive Engineering students from the Mechanics Faculty.. Index Terms— AUTOMOTIVE ENGINEERING, AUTOMATIC GEARBOX , TORQUE CONVERTER , REVOLUTIONS PER MINUTE (RPM) , DIDACTIC BOARD

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Sieklucki, Grzegorz. "Optimization of Powertrain in EV." Energies 14, no. 3 (January 30, 2021): 725. http://dx.doi.org/10.3390/en14030725.

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The method for preliminary powertrain design is presented in the paper. Performance of the EV is realized by motor torque–speed curve and gear ratio optimization. The typical two-zone mechanical characteristic of a PMSM traction motor is included in the optimization program. The longitudinal vehicle model is considered in the paper. Some examples try to show the calculation possibilities in application to existing vehicles: Tesla Model S and Mini Cooper SE.

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Cheng, Shuo, Ming-ming Mei, Shi-yong Guo, Liang Li, Cong-zhi Liu, Xiang Chen, and Xiu-heng Wu. "A novel coupling strategy for automated vehicle’s longitudinal dynamic stability." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 235, no. 10-11 (April 5, 2021): 2753–63. http://dx.doi.org/10.1177/09544070211006530.

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The autonomous vehicle has been developed widely, and attracted much attention of global automotive industry. Wherein, longitudinal dynamics control is one of the most crucial issues of autonomous vehicles. The throttle-by-wire (TBW) control could implement the acceleration command through adjusting the throttle opening, thus control the driving torque of the fuel autonomous vehicle. However, an automated vehicle controlled by traditional TBW in low-friction road conditions could reach large slip ratio region, which could adversely cause the loss of vehicle longitudinal dynamic stability. To tackle the mentioned issues, this paper proposes an adaptive sliding-mode control (SMC) algorithm to optimize tire slip speed of the automated vehicle. When the intervention conditions of active acceleration are satisfied, the TBW can take over the throttle opening control instead of the driver. Firstly, the SMC can calculate an intervention of the effective torque input based on tire torque balance dynamics. Moreover, a traction control system (TCS) and TBW coupling strategy based on the logic threshold method is put forward to response the optimum slip speed curve. Thus, during the vehicle starting process, a three-layer control strategy consisting of TBW, torque control, and pressure control of TCS is involved. Finally, real-car snow and ice road tests are carried out, and experimental results demonstrate great performance of the proposed strategy in complicated low-friction road.

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42

Ismail, Mohd Azlan, Al Khalid Othman, and Hushairi Zen. "Numerical Investigation of Rotational Speed on Pump as Turbine for Microhydro Applications." Applied Mechanics and Materials 833 (April 2016): 11–18. http://dx.doi.org/10.4028/www.scientific.net/amm.833.11.

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Pump as Turbine (PAT) always has been a favourable solution to generate electricity in rural areas when there is a potential microhydro site. Such systems have lower capital cost, and they are easier to maintain than commercially-available microhydro turbines. Normally, PAT is designed to run at a rated rotational speed so it can directly couple with an induction generator in order to match the synchronous speed. In an actual scenario, the PAT’s rotational speed changes and fluctuates with respect to flow rate due to the absence of a hydraulic control mechanism. It is essential to understand how the PAT behaves under different rotational speeds in order to design good microhydro systems. The aim of this study was to conduct simulation analysis of the effect of rotational speed on PAT’s performance curve over a range of flow rates. ANSYS CFX software was used as the Computational Fluid Dynamic (CFD) simulation tool in this study. Three distinct flow domains was modelled by Computer Aided Design (CAD) software and assembled as the computational fluid domains. Mesh independence analysis and convergence criteria were set to ensure the accuracy of the model. The torque generated by the impeller was collected from the simulation data and presented in the PAT performance curve. It was observed that the pressure head and torque generated increased at higher rotational speeds, thus maintaining the efficiency value. The results showed that the efficiency of the PAT was maintained around 76.5% for rotational speeds between 1350 to 1650 RPM, but the best efficiency point shifted to lower flow rate for lower rotational speed. The outcomes of this study will be useful for turbomachinery researchers, microhydro users, and project engineers for predicting the PAT performance for designing microhydro systems.

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Liu, An, Wei He, Zhe Kun Li, and Li Cheng. "Study on Dynamic Characteristics of the Bridge Crane Hoisting Mechanism Based on State-Space Method." Advanced Materials Research 1061-1062 (December 2014): 739–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.739.

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The dynamic characteristics researches of the bridge crane hoisting mechanism were summarized. Four-freedom-degree elasticity vibration model was established according to actual working condition of bridge crane hoisting mechanism. It considered the impact of the input torque, the stiffness of wire rope and so on. The paper applied to the state-space method to solve the numerical value and simulation based on the Matlab/Simulink software. It contained the hoisting displacement and speed curve, and the bridge structure volatility curve. The simulation results show that the correctness of the model, which lay the theoretical basis for all kinds of hoisting mechanism dynamic characteristics research in dynamic problems

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44

Islam, Md Rashedul, Md Maruful Islam, Md Kamal Hossain, and Pintu Kumar Sadhu. "Performance Analysis of a DTC and SVM Based Field-Orientation Control Induction Motor Drive." International Journal of Power Electronics and Drive Systems (IJPEDS) 5, no. 3 (February 1, 2015): 336. http://dx.doi.org/10.11591/ijpeds.v5.i3.pp336-343.

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<p>This study presents a performance analysis of two most popular control strategies for Induction Motor (IM) drives: direct torque control (DTC) and space vector modulation (SVM) strategies. The performance analysis is done by applying field-orientation control (FOC) technique because of its good dynamic response. The theoretical principle, simulation results are discussed to study the dynamic performances of the drive system for individual control strategies using actual parameters of induction motor. A closed loop PI controller scheme has been used. The main purpose of this study is to minimize ripple in torque response curve and to achieve quick speed response as well as to investigate the condition for optimum performance of induction motor drive. Depending on the simulation results this study also presents a detailed comparison between direct torque control and space vector modulation based field-orientation control method for the induction motor drive.</p>

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Li, Yun Feng, Xiao Yun Feng, and Rui Kuo Liu. "Maximum Adhesion Control of Railway Based on Sliding Mode Control System." Advanced Materials Research 383-390 (November 2011): 5242–49. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5242.

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The wheels will idle when the relative slipping speed between the wheel and rail exceeds the reference slipping speed. In order to avoid this phenomenon, the simplified model of wheel-rail traction torque transmission was established. And the adhesion coefficient and vehicle velocity are got through the disturbance observer. Then the recursive least squares method was used to forecast the slope of the adhesion-slip curve. Sliding variable structure controller was used to control the error of wheel velocity and reference velocity. From the results of simulation, this method can be effective to maintain the adhesion coefficient around the maximum. And the slipping speed approached the reference value, so the damage for wheel and rail was effectively prevented which achieved the desired effect.

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46

Gallicchio, Gianvito, Marco Palmieri, Mauro Di Nardo, and Francesco Cupertino. "Fast Torque Computation of Hysteresis Motors and Clutches Using Magneto-static Finite Element Simulation." Energies 12, no. 17 (August 28, 2019): 3311. http://dx.doi.org/10.3390/en12173311.

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Hysteresis motor and clutches have several advantages, such as constant torque from zero to synchronous speed, low torque ripple, and low fabrication cost. Low efficiency and power factor are the main features that have limited the application of this type of electrical machine to few applications. Being a niche argument, little literature has addressed the problem of analytical and finite element (FE) modelling of hysteresis electrical machines. This paper first describes the most important contributions of the literature on the analytical and FE modelling of hysteresis motors and clutches and then proposes a method for the fast computation of its performance. The proposed procedure consists of two steps: first, a magneto-static FE simulation is performed considering the normal magnetization curve of the hysteresis material; then, the average torque is computed by a post-processing analysis. The proposed method is used to analyze a hysteresis clutch and the obtained results are compared with those achieved using a commercial finite element software that implements a vector hysteresis model.

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Guo, Cui Xia, Kang Liu, Wen Ling Xie, and Shun Yong Zhou. "Study on Engine Characteristic Curves Drawing Method Based on BP Neural Network." Advanced Materials Research 591-593 (November 2012): 593–96. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.593.

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The BP neural network model based on PSO particle swarm optimization algorithm is analyzed in this paper. The engine speed and torque is the input of the network and the fuel consumption rate is output. Appling PSO algorithm to optimize BP neural network weights and threshold value, which makes the BP network having high precision nonlinear mapping relation, and then realize it by MATLAB software. Practice proves that the method is effective and it provides a new method of rendering engine characteristic curve fitting.

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Huynh Thanh, Cong. "A Study on a mechanical continuously variable injection timing system for improvement of agricultural small diesel DI engine." Science and Technology Development Journal 17, no. 4 (December 31, 2014): 57–66. http://dx.doi.org/10.32508/stdj.v17i4.1530.

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This paper presents the development of a MCVIT (mechanical continuous variable injection timing) system for evaluating effects of injection timing – one of the efficiently experimental methods for improving diesel engine performance and emission characteristics to match modern emission regulations and bio-fuels. A MCVIT system has been designed and built with the ability to adjust freely and directly the injection timing for a wide range from 0 to 40°CA BTDC (before top dead center) while keeping the same injection pressure rate. Some experiments have been done to verify its significant specifications such as friction torque – speed curve, accuracy and stability. The results show that the maximum friction torque of this system is around 2.6N.m over range of engine speed and its maximum deviation is ±1.0°CA over a large range of testing injection timing. Preliminary study on VIKYNO RV215-2 agricultural small diesel DI engine has also proved that the engine performance and emission characteristics are directly influenced by injection timing. Thus the developed MCVIT system is an efficient and low cost tool for R&D activities in small diesel engines.

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Jamal, Jamal, A. M. Shiddiq Yunus, and Lewi Lewi. "Pengaruh Kelengkungan Sudu Terhadap Kinerja Turbin Angin Savonius." INTEK: Jurnal Penelitian 6, no. 2 (November 12, 2019): 139. http://dx.doi.org/10.31963/intek.v6i2.1578.

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Savonius wind turbine is one of the wind turbines that is more widely used for low energy needs, with more energy needs, this turbine type is very feasible to be developed. This research aims to improve the performance of Savonius wind turbines with variations in turbine blade curvature and variations in wind speed. The research method is a laboratory experiment on the fan test, the blade curvature test variation is 1R; 1.5R and 2R, another variation is the wind speed which are 4.0; 5.5; 7.0 and 8.5 m/s. The experiement results shows that the greater the wind speed, the input power, air mass flow velocity, power output, and efficiency will be even greater; the greater the load force on the turbine shaft, the torque on the turbine shaft will also be greater; the relationship of force loads to power output and turbine efficiency is to construct a parabolic curve; for the same wind speed, the 2R turbine has the lowest rotation, power output and efficiency compared to the 1R and 1.5R turbines; at the same wind speed the 1R turbine produces a higher rotation but requires lower torque than the 1.5R turbine; at low wind speeds (4 m / s) the 1.5R turbine has better efficiency than the 1R turbine, whereas at the high wind speed (8.5 m/s) the 1R turbine has a better efficiency than the 1.5R turbine; The maximum efficiency is obtained at 89.56% in the 1R curvature turbine with a wind speed of 8.5 m / s.

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Liu, Jin Chao, Ke Sun, Jian Hua Zhang, Yu Na Zhao, and Mao Hua Pan. "Effects of Surge on Rotor Aerodynamics of Offshore Floating Wind Turbine." Advanced Materials Research 1070-1072 (December 2014): 177–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.177.

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This paper, using the blade momentum theory combined with dynamic inflow correction and stall delay correction, analyses how periodic surge affect rotor aerodynamics of the NREL 5MW turbine operating at three different regions of its power curve. Results show that surge has the largest effects on rotor aerodynamics in region under rated wind speed while the smallest in region above that. Besides, oscillation amplitudes of rotor aerodynamic loads are in linear correlation with surge frequency and amplitude in most cases, except that rotor power and torque in region above rated wind speed is in linear correlation with the square of surge frequency. Results of this analysis would provide reference data for designs of floating wind turbine systems.

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Journal articles on the topic 'Torque-speed curve'

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