A Survey on Internet of Vehicles Applications, Architecture, Communication Models and Challenges

To solve the problems of long shifting time and low transmission efficiency of motor transmission in unmanned electric vehicles, the performance test of motor transmission is carried out. The EMT transmission system is selected as the test object of the motor transmission of an unmanned electric vehicle. The gear number of the transmission is determined with the aim of reducing the speed requirement of the motor when the motor runs at high speed and working in the high-efficiency area near the base speed as far as possible. According to the gear speed and torque of the load motor, the driving moment and torsion moment of the drive motor in the acceleration stage are determined based on the total inertia of the drive motor and other parameters. Finally, the test bench of the motor transmission towing is set up and the test is carried out. The experimental results show that when the rated torque of the motor transmission is 100% at 1600r/min shift speed point and 150% at 1800r/min shift speed point, the minimum shift time of the motor transmission is 425ms. Meanwhile, the transmission efficiency of the motor transmission of the unmanned electric vehicle is between 90% and 92% and the transmission performance is high.

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Optimal Falling Track Design for Twice detonating Fuze of Double event Fuel air Explosive with High Speed

Defence Science Journal ◽

10.14429/dsj.70.14868 ◽

2020 ◽

Vol 70 (4) ◽

pp. 366-373

Author(s):

Congliang Ye ◽

Qi Zhang

Keyword(s):

High Speed ◽

High Efficiency ◽

Single Point ◽

Design System ◽

Motion Trajectory ◽

Novel Approach ◽

Scale Experiment ◽

Set Up ◽

Point Center ◽

Double Event

To prevent the initiation failure caused by the uncontrolled fuze and improve the weapon reliability in the high-speed double-event fuel-air explosive (DEFAE) application, it is necessary to study the TDF motion trajectory and set up a twice-detonating fuze (TDF) design system. Hence, a novel approach of realising the fixed single-point center initiation by TDF within the fuel air cloud is proposed. Accordingly, a computational model for the TDF motion state with the nonlinear mechanics analysis is built due to the expensive and difficult full-scale experiment. Moreover, the TDF guidance design system is programmed using MATLAB with the equations of mechanical equilibrium. In addition, by this system, influences of various input parameters on the TDF motion trajectory are studied in detail singly. Conclusively, the result of a certain TDF example indicates that this paper provides an economical idea for the TDF design, and the developed graphical user interface of high-efficiency for the weapon designers to facilitate the high-speed DEFAE missile development.

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Simulation and experimental study on lubrication of high-speed reducer of electric vehicle

Industrial Lubrication and Tribology ◽

10.1108/ilt-08-2020-0309 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Fuchun Jia ◽

Yulong Lei ◽

Xianghuan Liu ◽

Yao Fu ◽

Jianlong Hu

Keyword(s):

Flow Field ◽

Electric Vehicle ◽

High Speed ◽

Content Type ◽

Speed Reducer ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Novel Method ◽

Set Up ◽

Volume Method

Purpose The lubrication of the high-speed reducer of an electric vehicle is investigated. The specific contents include visualization of the flow field inside reducer, lubrication evaluation of bearings and efficiency experiment. Design/methodology/approach The flow field inside reducer at five working conditions: straight, uphill, downhill, left lean and right lean is simulated by smoothed particle hydrodynamics (SPH). According to the instantaneous number of particles through bearings, the lubrication states of bearings are evaluated. The test platform is set up to measure the efficiency of the reducer. Findings The flow field inside the reducer is obtained, the lubrication of bearings needs to be improved, the efficiency of the electric vehicle reducer meets the requirement. Originality/value The SPH method is used to simulate lubrication instead of using the traditional grid-based finite volume method. A novel method to evaluate the lubrication of bearings is proposed. The method and conclusions can guide electric vehicle reducer design.

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The Design of Flexible Manufacturing System Design Based on Fieldbus

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.850-851.628 ◽

2013 ◽

Vol 850-851 ◽

pp. 628-631

Author(s):

Fang He

Keyword(s):

Real Time ◽

Time Management ◽

Flexible Manufacturing ◽

High Speed ◽

Manufacturing System ◽

Flexible Manufacturing System ◽

High Efficiency ◽

Manufacturing System Design ◽

Multi Level ◽

Set Up

Control system is a very important part of flexible manufacturing system, But the disadvantages of traditional FMS communication network is getting more and more can't meet the need of the high-speed development of flexible manufacturing system technology, the real-time and the high efficiency of the communication system, this paper puts forward the fieldbus network used in flexible manufacturing system. By means of field bus communication technology to realize flexible manufacturing system, set up the master station and slave station in the system, multi-level real-time management, the reliability of the system has been greatly improved.

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A Research on Stability Control for EMU Network Communication

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.846-847.774 ◽

2013 ◽

Vol 846-847 ◽

pp. 774-777

Author(s):

Wei Zhang

Keyword(s):

High Speed ◽

High Efficiency ◽

Data Communication ◽

Doppler Frequency ◽

Signal Propagation ◽

Transmission Efficiency ◽

Stability Control ◽

Network Communication ◽

The Stability ◽

Communication Control

Conventional communication control methods cannot solve the Doppler frequency shift problem in high-speed moving network communication of EMU. The shift phenomenon in signal propagation, the high error rate and the low transmission efficiency make it's unable to ensure the stability of the high-speed communication network. Therefore, the paper designs the control model accordance with fuzzy estimation and data communication error correction for stability control of EMU network communications. Experimental results show that under the method delay and bandwidth changes of EMU communication is relatively stable, which means that the method can achieve high efficiency, high precision control for EMU network communication, and with a high application value.

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A Study on Regenerative Braking Control Strategy for an Extended-Range Electric Vehicle

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.1122 ◽

2014 ◽

Vol 602-605 ◽

pp. 1122-1126

Author(s):

Ji Gao Niu ◽

Chun Hua Xu

Keyword(s):

Electric Vehicle ◽

Control Strategy ◽

Energy Recovery ◽

High Efficiency ◽

Regenerative Braking ◽

Extended Range ◽

Braking Force ◽

Braking Control ◽

Set Up ◽

Hybrid Motor

In order to further improve the baking energy recovery rate of extended-range electric vehicle (E-REV), thus to extend driving distance, a high efficiency regenerative braking control strategy for E-REV was proposed. Based on the co-simulation platform with AVL-Cruise and Simulink, a dynamic model for E-REV was set up and simulation calculations on hybrid motor-mechanical regenerative braking were performed. The simulation results with typical driving cycles illustrate that the friction braking force and the regenerative braking force could be well integrated, braking energy recovery efficiency was high, and the proposed control strategy of regenerative braking in the paper is effective.

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Research on Electronic Differential Control Method of Electric Vehicle with Motorized Wheels Based on Adhesion Coefficient

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.706-708.950 ◽

2013 ◽

Vol 706-708 ◽

pp. 950-956

Author(s):

Ying Chun Long ◽

Li Fu Li

Keyword(s):

Electric Vehicle ◽

High Speed ◽

Control Method ◽

Permanent Magnet Synchronous Motor ◽

Adhesion Coefficient ◽

Set Up ◽

Differential Control ◽

Six Degree Of Freedom ◽

Vehicle Dynamic Model ◽

Differential Control Method

This paper presents an electronic differential control strategy based on equal adhesion coefficient, it makes electric vehicle (EV) with two dual-motorized-wheels achieve differential by distributing and controlling the driving torque. First, six degree-of-freedom (6-DOF) vehicle dynamic model was set up and electronic differential system based on permanent magnet synchronous motor (PMSM) vector control was designed, then the simulation of differential control method with Matlab/Simulink was performed. The results show that when the high-speed vehicle steering in the low road adhesion coefficient, the electronic differential control method based on the principle of equal adhesion coefficient can keep two driving wheels’ adhesion coefficient utilization ratio the same, avoiding single wheel skid and improving the steering stability.

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Research and Development of a Transportable Optical Ground Station in NICT: The Results of the First Performance Test

Frontiers in Physics ◽

10.3389/fphy.2021.636696 ◽

2021 ◽

Vol 9 ◽

Author(s):

Yoshihiko Saito ◽

Hideki Takenaka ◽

Koichi Shiratama ◽

Yasushi Munemasa ◽

Alberto Carrasco-Casado ◽

...

Keyword(s):

High Speed ◽

Performance Test ◽

The Other ◽

Atmospheric Conditions ◽

Free Space Optical ◽

Ground Station ◽

Pointing Accuracy ◽

Set Up ◽

Site Diversity ◽

Diversity Technique

In recent years, the necessity of free-space optical (FSO) communications has increased as a method for realizing high-speed communications between satellites and the ground. However, one disadvantage of FSO communications is the significant influence of the atmosphere. Specifically, FSO communications cannot be utilized under certain atmospheric conditions, especially in the presence of clouds. One of the solutions to this problem is the site diversity technique, which makes it possible to select a given ground station with better atmospheric conditions among a number of fixed ground stations. The other solution is to prepare a ground station that can be moved to a place with better atmospheric conditions. We applied the latter method and developed a transportable optical ground station in NICT. We utilize a realistic telescope diameter, which is about 30 cm at the maximum, capable of being set up quickly, and with a pointing accuracy of about 100 µrad. In addition, it is necessary to prepare a fine-pointing optical system that performs tracking with about 1/10 of the pointing accuracy of the telescope. In this paper, we report the results of the first performance test of the transportable optical ground station in NICT.

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