scholarly journals In-Wheel Two-Speed AMT with Selectable One-Way Clutch for Electric Vehicles

Actuators ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 220
Author(s):  
Dele Meng ◽  
Fei Wang ◽  
Yuhai Wang ◽  
Bingzhao Gao
Keyword(s):  
Electric Vehicles ◽  
High Speed ◽  
Prototype Model ◽  
Mechanical Transmission ◽  
Technical Specifications ◽  
Simulation Results ◽  
Drive Systems ◽  
Unsprung Mass ◽  
Momentary State

To improve the efficiency of the electric vehicle (EV) drive systems and EV performance, the use of multi-speed transmissions and distributed drives has been studied extensively. In addition, to develop efficient and compact drive systems, new clutch solutions are needed. In this paper, we propose an in-wheel two-speed automatic mechanical transmission (IW-AMT) with a selectable one-way clutch (SOWC). The IW-AMT consists of a high-speed motor and a mechanical shift actuator, and it can realize shifting without power interruption, thus effectively reducing the unsprung mass and the technical specifications of the motor. We established a virtual prototype model of the IW-AMT to show the shifting process and evaluate the quality of shifting. The simulation results of the upshifting process indicated that the vehicle torque and velocity changed smoothly, and the maximum jerk is less than 10 m/s3. Furthermore, to improve the jerk induced by the downshifting process, we analyzed the momentary state of the SOWC struts that are dropped and attempted to improve the jerk from two aspects: improving the wet multi-plate clutch (WMPC) combination curve and improving the SOWC structure. The results indicated that the downshift-induced jerk can be reduced to 13 m/s3.

scholarly journals RADIO ACCESS NETWORK REQUIREMENT FOR NEW DEPLOYMENT OF WIMAX IN DHAKA

2016 ◽  
pp. 175-179
Author(s):  
Tawhid Kawser ◽  
MOHAMMED R. AL-AMIN ◽  
KHONDOKER Z. ISLAM ◽  
SIFAT-E- MOHAMMAD
Keyword(s):  
High Speed ◽  
Access Network ◽  
Mobile Wimax ◽  
Radio Network ◽  
Planning Tool ◽  
Radio Access ◽  
High Speed Data ◽  
Simulation Results ◽  
Radio Planning

Mobile WiMAX is expected to be the next generation radio-interface, complementing WLAN and challenging EVDO/HSPA/LTE. High speed data rate, reduced latency, better Quality of service, and mobility can allow WiMAX to meet the rapidly growing demand of the users. A study of WiMAX Radio Network Planning (RNP) for an urban area like Dhaka city in Bangladesh is presented in this paper in order to help predetermine the radio access infrastructure requirements. A suitable radio planning tool has been used for this purpose. The simulation results of throughput and Carrier to Interference plus Noise Ratio (CINR) are provided.

scholarly journals Motion Evaluation Of A Wheelchair Prototype For Disabled People

2015 ◽  
Vol 67 (1) ◽  
pp. 44-50
Author(s):  
Ionut Daniel Geonea ◽  
Nicolae Dumitru ◽  
Alexandru Margine
Keyword(s):  
High Speed ◽  
Design Solution ◽  
Prototype Model ◽  
Mechanical Transmission ◽  
Motion Controller ◽  
Disabled People ◽  
Video Cameras ◽  
Experimental Prototype ◽  
Solid Works ◽  
Analysis System

Abstract In this paper is presented the design solution and experimental prototype of a wheelchair for disabled people. Design solution proposed to be implemented uses two reduction gears motors and a mechanical transmission with chains. It’s developed a motion controller based on a PWM technology, which allows the user to control the wheelchair motion. The wheelchair has the ability of forward – backward motion and steering. The design solution is developed in Solid Works, and it’s implemented to a wheelchair prototype model. Wheelchair design and motion makes him suitable especially for indoor use. It is made a study of the wheelchair kinematics, first using a kinematic simulation in Adams. Are presented the wheelchair motion trajectory and kinematics parameters. The experimental prototype is tested with a motion analysis system based on ultra high speed video cameras recording. The obtained results from simulation and experimentally tests, demonstrate the efficiency of wheelchair proposed solution.

scholarly journals High-throughput free surface electrospinning using solution reservoirs with different depths and its preparation mechanism study

2020 ◽  
Author(s):  
Jing Yin ◽  
Adnan Ahmed ◽  
Lan Xu
Keyword(s):  
Free Surface ◽  
High Throughput ◽  
High Speed ◽  
Mechanism Study ◽  
Free Surface Electrospinning ◽  
Different Depths ◽  
Simulation Results ◽  
Rsm Model ◽  
Scanning Electron

This paper presented a self-made spherical section free surface electrospinning (SSFSE) using solution reservoirs with different depths for obtaining high-throughput production of nanofibers, and studied its preparation mechanism. The effects of the solution reservoir depth on the SSFSE process as well as the quality and yield of polyacrylonitrile (PAN) nanofibers were investigated experimentally using high-speed camera, precise electronic balance and scanning electron microscopy, and were analyzed theoretically by response surface methodology (RSM) and numerical simulation. The values predicted by the established RSM model and the electric field simulation results obtained by Maxwell 3D were all consistent with the experimental data, which showed that the solution reservoir depth had little effects on the quality of PAN nanofibers, but had great effects on the yields of them. When the maximum depth of solution reservoir was 4.29 mm, the PAN nanofibers prepared have the best quality and the highest yields.

scholarly journals Development of TRINETRA : A Sensor Based Vision Enhancement System for Obstacle Detection on Railway Tracks

2021 ◽  
Author(s):  
R.K. Saket
Keyword(s):  
Long Range ◽  
High Speed ◽  
Heavy Rain ◽  
Obstacle Detection ◽  
Stimulated Emission ◽  
Prototype Model ◽  
Radio Detection ◽  
Light Amplification ◽  
Wide Range ◽  
Technical Specifications

The authors have developed a prototype, which promises easy passage for trains in unknown environments such as zero visibility situations, fog, smog, and heavy rain. The prototype is based upon the integration of a camera, Radio Detection and Ranging (RADAR), and Infrared (IR) Light Amplification by Stimulated Emission of Radiation (LASER).The camera used in the prototype catches a long-range view of the track and presents it live on a mini screen fixed in the loco pilot cabin. A combined short, mid, and long-range radar sensor system is used to detect obstacles continuously in loco pilot blind spots on the track, particularly for collision avoidance assistance at high speed. The present work proposes a long-range laser IR illuminator with a wide range of color and mono cameras to aid clear and precise monitoring in zero visibility conditions, which is fixed on the front portion/engine of the locomotive/engine. The prototype experimental results for 2 m - 2 km distances have been performed on a live running train, which shows that the developed prototype tracks obstacles effectively during fog and smog conditions. The design concept, observation, prototype model, and other technical specifications have been presented, and satisfactory results were found.

scholarly journals Experimental study on high-speed endurance of electric vehicle at normal temperature (25℃)

2021 ◽  
Vol 268 ◽  
pp. 01032
Author(s):  
Chun Li ◽  
Fan Yang ◽  
Zhenchong Wang
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
High Speed ◽  
Chassis Dynamometer ◽  
Test Quality ◽  
Driving Mode ◽  
Test Conditions ◽  
Temperature Environment ◽  
Driving Range

Electric vehicle[1] endurance has always been a major concern for car buyers. Based on the six conventional electric vehicles selected from the market, the driving range of the chassis dynamometer with the environment warehouse is first carried out under the CLTC-P condition of normal temperature environment, and compared with the vehicle meter-display driving range. After testing the speed of 100 km/h of the driving range, the high-speed driving range at normal temperature is obtained, and then compared with the normal temperature driving range and the meter-display driving range, the drop rate of high-speed driving range is obtained. By analyzing and comparing the different test conditions of 6 vehicles, the influence trend of battery quantity, test quality, resistance and driving mode on high-speed driving range is obtained. Allowing consumers to anticipate their travel plans and also provides data for subsequent car companies to improve the quality of electric vehicles.

scholarly journals Development of TRINETRA : A Sensor Based Vision Enhancement System for Obstacle Detection on Railway Tracks

2021 ◽  
Author(s):  
R.K. Saket
Keyword(s):  
Long Range ◽  
High Speed ◽  
Heavy Rain ◽  
Obstacle Detection ◽  
Stimulated Emission ◽  
Prototype Model ◽  
Radio Detection ◽  
Light Amplification ◽  
Wide Range ◽  
Technical Specifications

The authors have developed a prototype, which promises easy passage for trains in unknown environments such as zero visibility situations, fog, smog, and heavy rain. The prototype is based upon the integration of a camera, Radio Detection and Ranging (RADAR), and Infrared (IR) Light Amplification by Stimulated Emission of Radiation (LASER).The camera used in the prototype catches a long-range view of the track and presents it live on a mini screen fixed in the loco pilot cabin. A combined short, mid, and long-range radar sensor system is used to detect obstacles continuously in loco pilot blind spots on the track, particularly for collision avoidance assistance at high speed. The present work proposes a long-range laser IR illuminator with a wide range of color and mono cameras to aid clear and precise monitoring in zero visibility conditions, which is fixed on the front portion/engine of the locomotive/engine. The prototype experimental results for 2 m - 2 km distances have been performed on a live running train, which shows that the developed prototype tracks obstacles effectively during fog and smog conditions. The design concept, observation, prototype model, and other technical specifications have been presented, and satisfactory results were found.

Design Simulation on Automatic Mechanical Transmission of Electric Vehicle

2013 ◽  
Vol 319 ◽  
pp. 605-609
Author(s):  
Yan Dong Song
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Dynamic Characteristics ◽  
Automatic Transmission ◽  
Drive Train ◽  
Mechanical Transmission ◽  
Vehicle Dynamic ◽  
Vehicle Model ◽  
Overall Performance ◽  
Simulation Results

By optimizing the matching of automatic transmission of car, it could improve the overall performance of electric vehicles. This article analyzes the structure of the electric vehicle drive train, then selects the automatic mechanical transmission combined with the motor-driven features. Then calculate the parameters of motors, batteries, transmission and other parts. The electric vehicle model was created in the Advisor software, then the simulation conditions were selected to test the car, so the vehicle dynamic characteristics and economy were verified by simulation results.

Robustness Analysis of Two-Speed Electric Vehicles

2013 ◽  
Author(s):  
Holger Roser ◽  
Paul D. Walker ◽  
Nong Zhang
Keyword(s):  
Electric Vehicles ◽  
High Speed ◽  
Robustness Analysis ◽  
Dual Clutch Transmission ◽  
Electric Drives ◽  
Driving Cycles ◽  
Bulk Weight ◽  
Operating Region ◽  
Driving Range ◽  
Simulation Results

This paper presents the findings of a theoretical analysis of a two-speed Dual-Clutch Transmission (DCT) for electric vehicle applications. Electric drives incorporating DCTs can offer improved driving economy and range, acceleration and climbing gradeability, with potentially smaller electric motors (EMs). Overall powertrain performance is simulated with different standard driving cycles, including urban, extra-urban, and constant speed driving, and different EM power ratings. Simulation results are compared against equivalent single-speed powertrain, including a conceptual evaluation of powertrain bulk, weight and cost. Despite added complexity of including a DCT, the simulated driving range is increased by shifting the operating region of the electric motor to greater efficiency regions. This is shown to be more predominant during high-speed driving. In addition, satisfactory drive performance can be achieved with smaller EMs, compensating for added transmission bulk, weight and cost. An outline of further areas of two-speed electric drive research and applications conclude this paper.

scholarly journals Design of XOR and XNOR Based Full Adder Circuits

2019 ◽  
Vol 9 (2) ◽  
pp. 2434-2437
Keyword(s):  
High Speed ◽  
Short Circuit ◽  
Full Adder ◽  
Short Delay ◽  
Xnor Gate ◽  
Simulation Results ◽  
Yield Capacity ◽  
Hybrid Circuit ◽  
Current Drain

This paper has a XOR / XNOR gate circuits produces separate and establishes a simultaneous XOR - XNOR function.. Due to stubby yield capacity and short-circuit energy dissipation, the power utilization and latency of these circuits is increasing A new one-bit adder hybrid circuit is chosen built on the effective gates of xor xnor or xor / xnor. Each prefer circuit has its own advantages as it is known for its high speed, low current drain, short delay product (PDP), galvanic ability, etc. Simulations of the planned models were carried out using Mentor Graphics to see the quality of these projects. The simulation results are based on the 130-nm CMOS engineering design. A recent technique of transistor sizing is implemented to improve the circuits ' PDP.

Four - Wheel Steering Vehicle Modeling and Simulation Based on ADAMS

2013 ◽  
Vol 690-693 ◽  
pp. 2796-2799
Author(s):  
Wen Ting Wang
Keyword(s):  
Control Strategy ◽  
High Speed ◽  
Experimental Simulation ◽  
Motor Vehicles ◽  
Prototype Model ◽  
Vehicle Modeling ◽  
Model And Simulation ◽  
Simulation Based ◽  
Speed Stability ◽  
Simulation Results

Based on ADAMS CAR module, and the establishment of four - wheel steering vehicle virtual prototype model of the Motor Vehicles ( the WS ). Front and rear comer is proportional to the control strategy, the angle step experimental simulation model and simulation results are analyzed. The results showed that 4WS cars can improve low speed maneuverability and high speed stability, but high speed likely to increase driver fatigue strength.

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