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The high temperature superconducting maglev-evacuated tube transport (HTS Maglev-ETT) is a green, energy-savingand high-speed future transit mode. The initial tube pressure is a vital parameter of the ETT system, to investigate the impact of the ini-tial tube pressure on the aerodynamic characteristics of the HTS maglev, a two-dimensional scaled simulation model of 1:10 was established. The aerodynamic drag of the train and the shock wave phenomenon in the tube under different initial tube pres-sures were studied. The study found that the shock wave formed in the tube contains oblique shock wave and normal shock wave. There is a linear relationship between the range of the shock wave and the initial tube pressure. The range of the shock wave and aerodynamic drag increase with the increases of initial tube pres-sure. Additionally, the pressure drag plays a dominant role in the total drag. By lowering the pressure in the tube, the pressure dif-ference between the front and rear of the train was reduced, thus reducing the aerodynamic drag.
Tianhao Ma; Xiao Hu; Jukun Wang; Yingyu Rao; Jun Zheng; Zigang Deng. Effect of Air Pressure on Aerodynamic Characteristics of the HTS Maglev Running in a Tube. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StyleTianhao Ma, Xiao Hu, Jukun Wang, Yingyu Rao, Jun Zheng, Zigang Deng. Effect of Air Pressure on Aerodynamic Characteristics of the HTS Maglev Running in a Tube. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StyleTianhao Ma; Xiao Hu; Jukun Wang; Yingyu Rao; Jun Zheng; Zigang Deng. 2021. "Effect of Air Pressure on Aerodynamic Characteristics of the HTS Maglev Running in a Tube." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
The high temperature superconducting (HTS) maglevevacuated tube transport (ETT) system is deemed as the next-generation transport system, with the potential to realize ultra-high speed. When the HTS maglev train travels inside the closed tube, it can cause serious aerodynamic thermal problems that affect the traf-fic safety. In this paper, a three-dimensional model and the Reynolds Average Navier-Stokes (RANS) based on SST k- tur-bulence model are used to study the aerodynamic thermal of the HTS maglev-ETT system. The numerical methods were verified by the wind tunnel experiment of the airfoil. The temperature dis-tribution and aerothermal phenomena of the train and tube at different speeds were analyzed. The results show that the aero-dynamic thermal of the HTS Maglev-ETT system is significantly affected by the speed. Due to the limitation of the annular space, the airflow is compressed in front of the head car and expanded near the tail car, making the temperature field more complex. The faster the train travels, the higher the average surface tempera-ture of the train becomes. The shock wave will appear at a high speed, which further deteriorates the temperature field distribu-tion of the system. These research results can provide a reference for the construction of the HTS Maglev-ETT system.
Jukun Wang; Shijie Bao; Xiao Hu; Haitao Li; Zigang Deng. Numerical Study on the Influence of the Speed on the Aerodynamic Thermal in the HTS Maglev–Evacuated Tube Transport System. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StyleJukun Wang, Shijie Bao, Xiao Hu, Haitao Li, Zigang Deng. Numerical Study on the Influence of the Speed on the Aerodynamic Thermal in the HTS Maglev–Evacuated Tube Transport System. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StyleJukun Wang; Shijie Bao; Xiao Hu; Haitao Li; Zigang Deng. 2021. "Numerical Study on the Influence of the Speed on the Aerodynamic Thermal in the HTS Maglev–Evacuated Tube Transport System." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
AbstractThe world's first high temperature superconductingHTSmagnetic levitation (maglev) engineering prototype vehicle and test line were officially put into use at Southwest Jiaotong University, China, on January 13th, 2021. This event means that HTS maglev has now made the leap in the engineering research. The influence of the suspension parameters on the random vibration of vehicle is an important content in dynamic optimization, which will affect the operation stationarity. In this paper, we investigated the random vibration of HTS maglev prototype by numerical simulation and optimized the suspension parameters to obtain a good operation quality. Firstly, a dynamic model of the HTS maglev engineering vehicle was established based on UM software. Secondly, the influence of suspension parameters and operation speed on vehicle operation stationarity were studied. Finally, simulation results were discussed in detail based on a set of selected suspension parameters. Results show that the suspension parameters and operating speed have obvious effects on the vehicle stationarity, and the reasonable selection of the secondary suspension parameters can ensure the stable operation of the HTS maglev at a maximum speed of 620 km/h.
Shan Wang; Haitao Li; Li Wang; Huan Huang; Zigang Deng; Weihua Zhang. Suspension Parameters Optimization of HTS Maglev Under Random Vibration. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StyleShan Wang, Haitao Li, Li Wang, Huan Huang, Zigang Deng, Weihua Zhang. Suspension Parameters Optimization of HTS Maglev Under Random Vibration. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StyleShan Wang; Haitao Li; Li Wang; Huan Huang; Zigang Deng; Weihua Zhang. 2021. "Suspension Parameters Optimization of HTS Maglev Under Random Vibration." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
The levitation force in the high temperature superconducting (HTS) maglev system has obvious nonlinear characteristics. When the excitation frequency and amplitude meet certain condi-tions, nonlinear vibration phenomena such as period-doubling bifurcation would appear. Nonlinear vibration will bring difficul-ties to dynamic analysis and even affect the safety and comfort of driving. While an electromagnetic shunt damper (EMSD) can ef-fectively reduce the vibration amplitude. This paper analyzes the influence of EMSD on the nonlinear vibration of HTS maglev sys-tems from the perspective of experiments and simulations. Firstly, free vibration and forced vibrations in the resonance interval are tested. Secondly, based on numerical simulations, the vibration response under various excitation was analyzed. The results show that the EMSD can effectively suppress its nonlinear vibration. This research has reference value for the detailed understanding of the dynamic characteristics of the HTS maglev and further ve-hicle design.
Haitao Li; Zigang Deng; Jingzhong Zhao; Jukun Wang; Shan Wang; Li Wang. Influence of Electromagnetic Shunt Damper on Nonlinear Vibration of HTS Maglev System. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StyleHaitao Li, Zigang Deng, Jingzhong Zhao, Jukun Wang, Shan Wang, Li Wang. Influence of Electromagnetic Shunt Damper on Nonlinear Vibration of HTS Maglev System. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StyleHaitao Li; Zigang Deng; Jingzhong Zhao; Jukun Wang; Shan Wang; Li Wang. 2021. "Influence of Electromagnetic Shunt Damper on Nonlinear Vibration of HTS Maglev System." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
The tube structure is an important guarantee for the dynamic stability of the high temperature superconducting maglev-evacuated tube transport (HTS Maglev-ETT) system, it is neces-sary to conduct relevant research on it. Based on simulation cal-culations with the FLUENT software, this paper studied the in-fluences of different tube section forms on the aerodynamic drag of maglev train in tube, as well as the pressure distribution in the tube system. In addition, the effects of the setting of cross aisle on the aerodynamic drag of maglev train and pressure fluctuation of flow field in tube were also studied. It was found that the differ-ence in the section forms of tube has little effect on the aerody-namic drag of maglev train and pressure distribution of the tube system under low pressure; the setting of cross aisle can be help-ful to reduce the aerodynamic drag of maglev train and the pres-sure fluctuation around the train to a certain extent. Therefore, the design of cross aisle is recommended for the HTS Maglev-ETT system.
Penghui Wang; Yong Zhang; Yanzhi Liu; Jukun Wang; Xiao Hu; Jun Zheng; Zigang Deng. Effects of Tube Structure on the Aerodynamic Characteristics of Evacuated Tube Transport System. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StylePenghui Wang, Yong Zhang, Yanzhi Liu, Jukun Wang, Xiao Hu, Jun Zheng, Zigang Deng. Effects of Tube Structure on the Aerodynamic Characteristics of Evacuated Tube Transport System. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StylePenghui Wang; Yong Zhang; Yanzhi Liu; Jukun Wang; Xiao Hu; Jun Zheng; Zigang Deng. 2021. "Effects of Tube Structure on the Aerodynamic Characteristics of Evacuated Tube Transport System." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
A new HTS maglev vehicle called KENYON that can carry 8 passengers was successfully developed in December 2019. The vehicle adopted the bogie structure of independent running gear, which brings the improvement of curve passing performance. In order to further optimize vehicle curve passing performance in view of the small radius curve of the ring test line, corresponding experimental research was carried out in this paper. The experimental results show that the small wheelbase and centripetal arrangement were beneficial to improve the vehicle's curve passing ability.
Jinkai Zhang; Zigang Deng; Wen Wang; Wuyang Lei; Yuhang Yuan; Zhehao Liu; Gaowei Zhang; Jun Zheng. Vibration Characteristics of the New High-Temperature Superconducting Maglev Vehicle Based on Operation Test. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StyleJinkai Zhang, Zigang Deng, Wen Wang, Wuyang Lei, Yuhang Yuan, Zhehao Liu, Gaowei Zhang, Jun Zheng. Vibration Characteristics of the New High-Temperature Superconducting Maglev Vehicle Based on Operation Test. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StyleJinkai Zhang; Zigang Deng; Wen Wang; Wuyang Lei; Yuhang Yuan; Zhehao Liu; Gaowei Zhang; Jun Zheng. 2021. "Vibration Characteristics of the New High-Temperature Superconducting Maglev Vehicle Based on Operation Test." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
The creating of the ideal turnout switch for a highly branched Maglev system is still a challenging task, because the turnout is one of the most important and indispensable devices involved in the Maglev system. The unmovable electromagnetic turnout can easily move the Maglev vehicles running one way to another, by replacing the permanent magnets (PMs) with electromagnets. But there is still a difference between the normal permanent magnet guideway (PMG) and the area of the turnout switch, which cannot be used in real operation at high speeds. Thus, this paper introduces the possible way to improve the design optimization of the electromagnet used in the electromagnetic turnout of the high temperature superconducting (HTS) Maglev systems. In particular, the use of a compensation coil between magnetic poles was suggested and proved. An equivalent circuit of the electromagnet with compensation coil was built, the criteria for the identity of the magnetic circuit are used to compare with the proposed variant. The parameters of the magnetic field in the electromagnet were calculated and the graph of the magnetic induction was given. Consequently, further direction for improving the electromagnet was described which means this work provides valuable references for the future ideal design of the electromagnet as a crucial element of an electromagnetic turnout for Halbach PMG.
Anastasiia Alexandrovna Gerasimenko; Haitao Li; Vadim Olegovich Korchagin; Can Peng; Xuanbo Wang; Zigang Deng. Design Optimization of the Electromagnetic Turnout by Using a Compensation Coil. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StyleAnastasiia Alexandrovna Gerasimenko, Haitao Li, Vadim Olegovich Korchagin, Can Peng, Xuanbo Wang, Zigang Deng. Design Optimization of the Electromagnetic Turnout by Using a Compensation Coil. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StyleAnastasiia Alexandrovna Gerasimenko; Haitao Li; Vadim Olegovich Korchagin; Can Peng; Xuanbo Wang; Zigang Deng. 2021. "Design Optimization of the Electromagnetic Turnout by Using a Compensation Coil." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
While traditional Permanent magnet electrodynamic suspension (PMEDS) structure has a high cost and low lift to drag ratio caused by sizeable magnetic resistance, which limits its wide-spread use. Hence, an annular Halbach structure of permanent magnet electrodynamic wheel (EDW) is studied in this paper, which is able to convert the magnetic resistance into the thrust force and avoid extra energy consumption, thus have the potential to be applied into the maglev car system. This paper established an experimental platform to measure the levitation force and thrust force of the EDW, then the force characteristics and variation tendencies were analyzed. Next, to verify the effectiveness and accuracy of the experiment, the comparison between force results from the experiment and that from the 2D FEM simulation were studied. Eventually, this paper lays a foundation for further research on the dynamic levitation characteristics of the EDW. And it provides an individual experimental basis and theoretical guidance for the study of maglev cars based on the PMEDS principle.
Xiaochen Sang; Zigang Deng; Jianzheng Chen; Liaan Jin; Ze Zhang; Jianghua Zhang; Jun Zheng. Analysis and Experiment on the Levitation Force and Thrust Force Characteristics of a Permanent Magnet Electrodynamic Wheel for Maglev Car Application. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -4.
AMA StyleXiaochen Sang, Zigang Deng, Jianzheng Chen, Liaan Jin, Ze Zhang, Jianghua Zhang, Jun Zheng. Analysis and Experiment on the Levitation Force and Thrust Force Characteristics of a Permanent Magnet Electrodynamic Wheel for Maglev Car Application. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-4.
Chicago/Turabian StyleXiaochen Sang; Zigang Deng; Jianzheng Chen; Liaan Jin; Ze Zhang; Jianghua Zhang; Jun Zheng. 2021. "Analysis and Experiment on the Levitation Force and Thrust Force Characteristics of a Permanent Magnet Electrodynamic Wheel for Maglev Car Application." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-4.
Magnetic levitation vehicles are means of transport that move without touching the ground by the action of magnetic forces. The electrodynamic levitation technique uses the repulsive forces that arise from the interaction between any variable magnetic field and a good electrical conductor. This work aims to organize in a didactic manner the main topics involving electrodynamic suspension applied to Maglev vehicles, thus contributing to the understanding of the technique.
Thais Nascimento Franca; Hongfu Shi; Zigang Deng; Richard Magdalena Stephan. Overview of Electrodynamic Levitation Technique Applied to Maglev Vehicles. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -5.
AMA StyleThais Nascimento Franca, Hongfu Shi, Zigang Deng, Richard Magdalena Stephan. Overview of Electrodynamic Levitation Technique Applied to Maglev Vehicles. IEEE Transactions on Applied Superconductivity. 2021; 31 (8):1-5.
Chicago/Turabian StyleThais Nascimento Franca; Hongfu Shi; Zigang Deng; Richard Magdalena Stephan. 2021. "Overview of Electrodynamic Levitation Technique Applied to Maglev Vehicles." IEEE Transactions on Applied Superconductivity 31, no. 8: 1-5.
High temperature superconducting (HTS) magnetic levitation (maglev) has the potential as a high-speed passenger transportation mode owing to its passive stabilization. Our group are constructing a 1500 m-long HTS maglev high speed test line. As a kind of passenger transport, safety and comfort are primary factors for its operation quality. However, the weak damping in HTS maglev system is not enough to suppress the vibration. As a preliminary study of the test line, this paper investigates an additional suspension system aiming to improve the dynamic characteristics of HTS maglev through experiments and simulation. We firstly built an HTS maglev model vehicle composed of a levitation frame and a car body. The dynamic responses were tested based on a dynamic measurement system. Secondly, a dynamic model of this kind of maglev device was established and the influence of suspension parameters on its vibration performance is analyzed theoretically. Thirdly, this suspension system was applied to an HTS maglev engineering prototype through numerical simulations. Experimental and simulation results manifested that the suspension system can effectively reduce the vibration, especially with high frequencies. This work provides a reference for the design of HTS maglev vehicles.
Haitao Li; Zigang Deng; Huan Huang; Hengpei Liao; Yuhang Yuan; Weihua Zhang. Experiments and Simulations of the secondary Suspension System to Improve the Dynamic Characteristics of HTS Maglev. IEEE Transactions on Applied Superconductivity 2021, PP, 1 -1.
AMA StyleHaitao Li, Zigang Deng, Huan Huang, Hengpei Liao, Yuhang Yuan, Weihua Zhang. Experiments and Simulations of the secondary Suspension System to Improve the Dynamic Characteristics of HTS Maglev. IEEE Transactions on Applied Superconductivity. 2021; PP (99):1-1.
Chicago/Turabian StyleHaitao Li; Zigang Deng; Huan Huang; Hengpei Liao; Yuhang Yuan; Weihua Zhang. 2021. "Experiments and Simulations of the secondary Suspension System to Improve the Dynamic Characteristics of HTS Maglev." IEEE Transactions on Applied Superconductivity PP, no. 99: 1-1.
In order to explore the potential advantages of HTS maglev vehicles, the dynamic response of HTS maglev vehicle-bridge coupling system model under different speeds and track beam spans is calculated by using Universal Mechanism (UM) software, which is further compared with two existing high-speed train systems, the high-speed EMS vehicle and wheel-rail vehicle. Before establishing the dynamic model, first a simplified mathematical model of levitation force of HTS maglev is extracted based on the experimental results of three YBCO bulks on a Halbach permanent magnet guideway (PMG). The results of simulation show that the HTS maglev vehicle can fully meet the requirements of current high-speed railway operation index on the acceleration of car body and its influence on track beam. The comparisons show that HTS maglev vehicle has some advantages over high-speed EMS vehicle and wheel-rail high-speed vehicle, especially in the acceleration of the car body and the impact on the track beam under high-speed operation. This makes a better understanding of the dynamic performance of HTS maglev vehicle, and provides an effective reference for the selection of high-speed railway system types and related indicators in the future.
Yuhang Yuan; Jipeng Li; Zigang Deng; Zhehao Liu; Dingding Wu; Li Wang. Dynamic performance of HTS maglev and comparisons with another two types of high-speed railway vehicles. Cryogenics 2021, 117, 103321 .
AMA StyleYuhang Yuan, Jipeng Li, Zigang Deng, Zhehao Liu, Dingding Wu, Li Wang. Dynamic performance of HTS maglev and comparisons with another two types of high-speed railway vehicles. Cryogenics. 2021; 117 ():103321.
Chicago/Turabian StyleYuhang Yuan; Jipeng Li; Zigang Deng; Zhehao Liu; Dingding Wu; Li Wang. 2021. "Dynamic performance of HTS maglev and comparisons with another two types of high-speed railway vehicles." Cryogenics 117, no. : 103321.
Based on the principle of permanent magnet electrodynamic suspension (PMEDS), a new concept maglev car was designed by using rotary magnetic wheels and a conductor plate. It has the advantages of being high-speed, low-noise, environmentally friendly, safe and efficient. The PMEDS car is designed to use a permanent magnet electrodynamic wheel (EDW) to achieve the integration of levitation force and driving force. The levitation force is generated by the repulsive force of the eddy current magnetic field, and the driving force is generated by the reaction force of magnetic resistance. A simplified electromagnetic force model of the EDW and a dynamics model of the PMEDS car were established to study the operating mode. It shows that the PMEDS car can achieve suspension when the rotational speed of the EDWs reaches a certain threshold and the critical speed of the EDWs is 600 rpm. With the cooperation of four permanent magnet EDWs, the PMEDS car can achieve stable suspension and the maximum suspension height can reach 7.3 mm. The working rotational speed of EDWs is 3500 rpm. At the same time, the movement status of the PMEDS car can be controlled by adjusting the rotational speed of rear EDWs. The functions of propulsion, acceleration, deceleration, and braking are realized and the feasibility of the PMEDS car system is verified.
Ze Zhang; Zigang Deng; Shuai Zhang; Jianghua Zhang; Li’An Jin; Xiaochen Sang; Pengfei Gao; Jing Li; Jun Zheng. Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology. Sustainability 2021, 13, 5827 .
AMA StyleZe Zhang, Zigang Deng, Shuai Zhang, Jianghua Zhang, Li’An Jin, Xiaochen Sang, Pengfei Gao, Jing Li, Jun Zheng. Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology. Sustainability. 2021; 13 (11):5827.
Chicago/Turabian StyleZe Zhang; Zigang Deng; Shuai Zhang; Jianghua Zhang; Li’An Jin; Xiaochen Sang; Pengfei Gao; Jing Li; Jun Zheng. 2021. "Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology." Sustainability 13, no. 11: 5827.
The space docking mechanism is one of the important ways to set up a space station, which is an important platform to explore the space. The traditional docking mechanism has achieved a series of docking missions, but it has the problems of large impact and plume pollution, which has the risk to affect the normal work of high precise instrument and equipment installed on spacecraft. In order to solve the drawback of the traditional docking mechanism, the high temperature superconducting magnetic docking mechanism (a novel docking mechanism) consisting of a high temperature superconductor (HTS) bulk installed on a target spacecraft module and an electromagnet installed on a tracking spacecraft module is proposed to be designed based on the flux pinning effect of a HTS. The diamagnetic and trapped magnetic field characteristics of a HTS can be considered to propose an equivalent method of processing HTS (equivalent processing method). Moreover, the equivalent processing method is verified by way of experiment. The mechanical characteristics of the high temperature superconducting magnetic docking mechanism in the case of different parameters are studied using the equivalent processing method. Based on the mechanical characteristics, the dynamic model of the novel docking mechanism is established in order to analyze the dynamic response in the case of different control laws. Furthermore, the docking performance of the high temperature superconducting magnetic docking mechanism is evaluated based on three indicators, that is, maximum overshoot, peak time, and adjustment time.
Mingliang Zhang; Deshui Yu; Zigang Deng; Pengfei Liu; Jiangchuan Niu; Zhiqiang Yu; Yingshuo Liu; Xinyang Xu. The mechanical characteristics and control of high temperature superconducting magnetic docking mechanism. AIP Advances 2021, 11, 055208 .
AMA StyleMingliang Zhang, Deshui Yu, Zigang Deng, Pengfei Liu, Jiangchuan Niu, Zhiqiang Yu, Yingshuo Liu, Xinyang Xu. The mechanical characteristics and control of high temperature superconducting magnetic docking mechanism. AIP Advances. 2021; 11 (5):055208.
Chicago/Turabian StyleMingliang Zhang; Deshui Yu; Zigang Deng; Pengfei Liu; Jiangchuan Niu; Zhiqiang Yu; Yingshuo Liu; Xinyang Xu. 2021. "The mechanical characteristics and control of high temperature superconducting magnetic docking mechanism." AIP Advances 11, no. 5: 055208.
The high-temperature superconducting (HTS) magnetic levitation (maglev) vehicle system is a kind of self-stable levitation mode, which is benefited from the characteristic of flux pinning of non-ideal type II superconductor. And this novel prototype has the outstanding advantages of simple structure, reliable principle, friendly environment and so on. But in the HTS maglev vehicle system, the damping coefficients of the primary suspension are very small. The vibration of the YBCO bulks over a permanent magnet guideway (PMG) will be incurred by the fluctuant external magnetic field, which is easily transmitted to the car body to affect the running comfort. The primary goal of this paper is to apply active vibration control into two linear electromagnetic actuators on each bogie. Each electromagnetic actuator is combined with an air spring as a kind of active suspension system in secondary suspension. Initially, the primary suspension stiffness coefficient and damping coefficient of YBCO bulks are measured by experiments. And the mathematical model of HTS maglev vehicle with active actuators was built using the German track spectrum of low interference as PMG irregularity. Then, the dynamic responses of HTS maglev vehicle system were simulated with PID and Fuzzy-PID controllers used in the active actuator to verify the feasibility of the control methods, and compared with the uncontrolled system. Finally, the results of the simulation indicate that both control strategies could improve vehicle comfortable and greatly improve the stability of the system compared to the passive bogie system.
Qingshu Li; Zigang Deng; Li Wang; Haitao Li; Jianghua Zhang; Elkin F. Rodriguez. Active vibration control of secondary suspension based on high-temperature superconducting maglev vehicle system. Physica C: Superconductivity 2021, 585, 1353872 .
AMA StyleQingshu Li, Zigang Deng, Li Wang, Haitao Li, Jianghua Zhang, Elkin F. Rodriguez. Active vibration control of secondary suspension based on high-temperature superconducting maglev vehicle system. Physica C: Superconductivity. 2021; 585 ():1353872.
Chicago/Turabian StyleQingshu Li; Zigang Deng; Li Wang; Haitao Li; Jianghua Zhang; Elkin F. Rodriguez. 2021. "Active vibration control of secondary suspension based on high-temperature superconducting maglev vehicle system." Physica C: Superconductivity 585, no. : 1353872.
With the merits of self-levitation, self-stabilization, zero magnetic drag, environment-friendliness and low energy consumption, high-temperature superconducting (HTS) maglev is regarded as one of the main technology modes for the future rail transit. For the researches on the lateral-vertical coupled dynamics of the HTS maglev, there is still a lack of lateral-vertical coupled force model that can characterize the macroscopic force between high-temperature superconductor and permanent magnet guideway (PMG). In this paper, a scanning experiment of levitation force and guidance force in a selected area on the vertical plane was carried out, and the law of levitation force and guidance force changing with coordinates was studied as well. Moreover, the finite element method (FEM) was used to calculate the magnetic field distribution of the Halbach-type PMG, meanwhile, the Lorentz force formula was utilized to analyze the influence law of PMG's magnetic field on the levitation force and guidance force. On the basis of this research, a two-dimension force model that neglects the hysteretic between high-temperature superconductor and PMG was established. By comparing the simulation results of the model with the measured data of the experiment, it is found that both of them are in good agreement, which verifies the reliability of the proposed model. The two-dimension force model is very helpful to the future research and calculation of the dynamics of the HTS maglev.
Long Kou; Zigang Deng; Haitao Li; Li Wang; Yingyu Rao; Zhihao Ke. A Two-Dimension Force Model Between High-Temperature Superconducting Bulk YBaCuO and Halbach-Type Permanent Magnet Guideway. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -8.
AMA StyleLong Kou, Zigang Deng, Haitao Li, Li Wang, Yingyu Rao, Zhihao Ke. A Two-Dimension Force Model Between High-Temperature Superconducting Bulk YBaCuO and Halbach-Type Permanent Magnet Guideway. IEEE Transactions on Applied Superconductivity. 2021; 31 (4):1-8.
Chicago/Turabian StyleLong Kou; Zigang Deng; Haitao Li; Li Wang; Yingyu Rao; Zhihao Ke. 2021. "A Two-Dimension Force Model Between High-Temperature Superconducting Bulk YBaCuO and Halbach-Type Permanent Magnet Guideway." IEEE Transactions on Applied Superconductivity 31, no. 4: 1-8.
Based on 3- D, unsteady compressible Navier-Stokes equations and SST k-ω two-equation IDDES turbulence model, the effect of cross passage on aerodynamic characteristics of evacuated tube transportation is simulated by overset mesh technology. The flow structure, aerodynamic force and aerothermal environment in three train/tube configurations are studied. The results show that there is a linear relationship between the length of the disturbed region of normal shock wave and running time. Cross passage can reduce both aerodynamic drag and aerothermal environment in the case of a single train passing. The transport channel and diffusion channel are formed to transport the air from tube A (B) to tube B (A). However, the lateral force fluctuates greatly. After the train leaves the cross passage, the lateral force coefficient periodically decays and oscillates. While, in the case of two train crossing, the existence of the cross passage could aggravate pressure field and aerothermal environment in the tube. Besides, the aerodynamic drag coefficient fluctuates during the intersection of two trains and the lateral force coefficient of the train fluctuates greatly and the maximum lateral force coefficient of two trains crossing is 2.86 times that of a single train passing.
Xiao Hu; Zigang Deng; Weihua Zhang. Effect of cross passage on aerodynamic characteristics of super-high-speed evacuated tube transportation. Journal of Wind Engineering and Industrial Aerodynamics 2021, 211, 104562 .
AMA StyleXiao Hu, Zigang Deng, Weihua Zhang. Effect of cross passage on aerodynamic characteristics of super-high-speed evacuated tube transportation. Journal of Wind Engineering and Industrial Aerodynamics. 2021; 211 ():104562.
Chicago/Turabian StyleXiao Hu; Zigang Deng; Weihua Zhang. 2021. "Effect of cross passage on aerodynamic characteristics of super-high-speed evacuated tube transportation." Journal of Wind Engineering and Industrial Aerodynamics 211, no. : 104562.
Dynamic electromagnetic characteristics is significant for the de-sign and operation of superconducting (SC) electrodynamic sus-pension (EDS) train. This paper established a three-dimensional transient numerical model in COMSOL. The current density exci-tation comes from the homogenized model of the superconducting magnet. In order to decrease the computing time, periodic boundary is introduced taking the place of finitely long route. Mapping operator is adopted to ensure the continuity of physical quantities in the case of geometric discontinuity in the process of motion. Induced current and magnetic force at different opera-tion velocity and different structure are simulated. In general, this model could be applied to simulate long term operation. It is also suited for the simulation of propulsion systems for EDS systems. In addition, this model provides electromagnetic environment in-tuitively that would be helpful for the stability analysis and de-sign of onboard SC magnets during long term operation.
Huan Huang; Zigang Deng; Haitao Li; Hanlin Zhu; Hongfu Shi; Jun Zheng. Numerical Simulation of Dynamic Electromagnetic Characteristics of Superconducting Electrodynamic Suspension (EDS) Train. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -5.
AMA StyleHuan Huang, Zigang Deng, Haitao Li, Hanlin Zhu, Hongfu Shi, Jun Zheng. Numerical Simulation of Dynamic Electromagnetic Characteristics of Superconducting Electrodynamic Suspension (EDS) Train. IEEE Transactions on Applied Superconductivity. 2021; 31 (5):1-5.
Chicago/Turabian StyleHuan Huang; Zigang Deng; Haitao Li; Hanlin Zhu; Hongfu Shi; Jun Zheng. 2021. "Numerical Simulation of Dynamic Electromagnetic Characteristics of Superconducting Electrodynamic Suspension (EDS) Train." IEEE Transactions on Applied Superconductivity 31, no. 5: 1-5.
High-temperature superconducting (HTS) maglev system, based on the magnetic flux pinning characteristic of non-ideal type II superconductors, can realize self-stable above permanent magnets. HTS maglev possesses the advantages of low-energy consumption, simple mechanical structure and environment-friendly, which make it an ideal high-speed transportation mode. When an HTS maglev vehicle crosses a ramp, the levitation height will fluctuate due to the rapid change of the track curve, which may affect the safety and stability of the system. In this paper, first, a levitation force model was obtained based on experimental data. Based on this model, a dynamic model of the HTS maglev vehicle-bridge coupled system was established. The dynamic response of the maglev train was simulated and analyzed when it operated through track grade change points under different track slopes, vertical curve radii and speeds. The influence of these parameters on the stability of the system was investigated, and the optimized design parameters for the vehicle and the track slope are proposed as well. This study provides references for the future engineering development of HTS maglev transportation.
Zhehao Liu; Zigang Deng; Long Kou; Li Wang; Haitao Li; Yuhang Yuan. The Stability of HTS Maglev Vehicle Through Grade Change Point. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -5.
AMA StyleZhehao Liu, Zigang Deng, Long Kou, Li Wang, Haitao Li, Yuhang Yuan. The Stability of HTS Maglev Vehicle Through Grade Change Point. IEEE Transactions on Applied Superconductivity. 2021; 31 (5):1-5.
Chicago/Turabian StyleZhehao Liu; Zigang Deng; Long Kou; Li Wang; Haitao Li; Yuhang Yuan. 2021. "The Stability of HTS Maglev Vehicle Through Grade Change Point." IEEE Transactions on Applied Superconductivity 31, no. 5: 1-5.
With the advantages of high-speed, low-noise and environment-friendly, magnetic levitation (maglev) train has the potential to become a high-speed transportation mode. High-temperature superconducting (HTS) maglev, which can remain stable levitation without any control system, is a competitive type of maglev rail transit. As a kind of high-speed transit, the vibration of the HTS maglev system is inevitable. Hence, studies about its dynamics are necessary and significant. The developments and researches for the HTS maglev vehicle dynamics in Applied Superconductivity Laboratory (ASCLab) are elaborated in detail in this paper. Based on the improved HTS maglev ring test line “Super-Maglev”, a series of research works have been carried out. First, the mathematical model of the pinning force was proposed. Second, motion stability and nonlinear vibration characteristics were studied. Then, the dynamic simulation of vehicle-bridge coupled system of the HTS maglev train was performed. Finally, certain vibration reduction optimizations were added. These dynamics researches give a strong verification for the future application prospect and feasibility of HTS maglev transportation, and the results can provide reference for the engineering application.
Zigang Deng; Li Wang; Haitao Li; Jipeng Li; Hongdi Wang; Jinbo Yu. Dynamic Studies of the HTS Maglev Transit System. IEEE Transactions on Applied Superconductivity 2021, 31, 1 -5.
AMA StyleZigang Deng, Li Wang, Haitao Li, Jipeng Li, Hongdi Wang, Jinbo Yu. Dynamic Studies of the HTS Maglev Transit System. IEEE Transactions on Applied Superconductivity. 2021; 31 (5):1-5.
Chicago/Turabian StyleZigang Deng; Li Wang; Haitao Li; Jipeng Li; Hongdi Wang; Jinbo Yu. 2021. "Dynamic Studies of the HTS Maglev Transit System." IEEE Transactions on Applied Superconductivity 31, no. 5: 1-5.
The evacuated tube transportation has great potential in the future because of its advantages of energy saving and environmental protection. The train runs in the closed tube at ultra-high speed. The heat quantity generated by aerodynamic heating is not easy to spread to external environment and then accumulates in the tube, inducing the ambient temperature in the tube to rise gradually. In this paper, a three-dimensional geometric model and the Shear Stress Transport (SST) κ-ω turbulence model are used to study the influence of initial ambient temperature on the structure of the flow field in the tube. Simulation results show that when the train runs at transonic speed, the supersonic flow region with low temperature and low-pressure is produced in the wake. The structure of the flow field of the wake will change with the initial ambient temperature. And the higher the initial ambient temperature is, the shorter the low temperature region in the wake will be. The larger temperature difference caused by the low temperature region may increase the temperature stress of the tube and affect the equipment inside the tube. Consequently, the temperature inside the tube can be maintained at a reasonable value to reduce the influence of the low temperature region in the wake on the system.
Shijie Bao; Xiao Hu; Jukun Wang; Tianhao Ma; Yingyu Rao; Zigang Deng. Numerical study on the influence of initial ambient temperature on the aerodynamic heating in the tube train system. Advances in Aerodynamics 2020, 2, 1 -18.
AMA StyleShijie Bao, Xiao Hu, Jukun Wang, Tianhao Ma, Yingyu Rao, Zigang Deng. Numerical study on the influence of initial ambient temperature on the aerodynamic heating in the tube train system. Advances in Aerodynamics. 2020; 2 (1):1-18.
Chicago/Turabian StyleShijie Bao; Xiao Hu; Jukun Wang; Tianhao Ma; Yingyu Rao; Zigang Deng. 2020. "Numerical study on the influence of initial ambient temperature on the aerodynamic heating in the tube train system." Advances in Aerodynamics 2, no. 1: 1-18.