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.

Micro Power Multiplexer, a Compact Device That Controls Mechanical Power Flow

A novel device that we have named Micro Power Multiplexer was developed. The goal of this work was to create a device that can split one power input to several outputs with controllable distribution while providing high modularity, robustness, and compactness. This device is capable to greatly reduce the size, weight, and complexity of a mechanical system requiring complicated distribution of mechanical power. To reduce friction and provide robustness, a device with “mechanical intelligence” named Non-Contact Flexure was designed. Non-Contact Flexure and a clutching mechanism for this device was theoretically modeled and are discussed in this paper. A zero-load prototype was built to test the design. The effect of main shaft and shift speed was studied during dynamic shifting experiments. Shifting with zero main shaft speed was also tested. The device was proven to be stable and robust. This paper further discusses in detail the various test results obtained.

The Influence of Technology Head Shift Speed, Abrasive Kind and Granularity on Technology Head Vibration during Hard-to-Machine Material Cutting

The submitted paper deals with examining the influence of technology head shift speed, abrasive kind and granularity on AWJ technology head vibration generation during manufacturing process of hard-to-machine material Hardox 500 of various thickness. The aim of the paper is to point at an early diagnostics and elimination of unwanted sources of vibration being generated on a technology head due to technological and technical parametre changes and a following design of optimal technological parametres for AWJ technology cutting.

Dynamic Analysis of a Gearless Wind Turbine Coupled to a DFIG

Most modern wind turbines use power electronic converters to maintain voltage phase, frequency, and magnitude at the grid-dictated values. However, such converters have often been reported to have high failure rates and cost. Further, failure of conventional wind turbine gearboxes adds to the overall cost and downtime. One remedy to limit the size of these converters is to implement a continuously variable transmission (CVT) which has fewer moving parts, e.g. a belt/chain CVT. Further, a CVT may completely eliminate the conventional gearbox architecture used in current wind turbine drivetrains. However, several dynamical issues related to CVTs prevent their widespread use. Current dynamical understanding of the most common CVTs (i.e. a belt/chain CVT) is limited by formulations of shift speed, belt-pulley friction torques, as well as belt-pulley slip. This paper aims to redress the shift speed formulation which has been widely based on quasi-static equilibrium analyses and, surprisingly, on slip definitions that provide minimal detail on the inertial interactions between the belt and the pulleys. Consequently, the paper proposes a new definition of slip to capture such interactions and uses it to develop more accurate representations of belt-pulley friction torques. Using MATLAB/Simulink, the CVT model is incorporated into a wind turbine model with a doubly-fed induction generator (DFIG). Further, the entire turbine/rotor-CVT-generator model is coupled to the grid through the conventional grid- and rotor-side converters (i.e. GSC and RSC respectively). The results for the overall integrated powertrain are presented and discussed in detail with the CVT operated in open-loop and the DFIG in closed-loop. The intent is to study how control inputs of a CVT affect power flow through the entire drivetrain to meet the objectives of a) maximal power extraction from the wind and b) tracking the grid demands without degrading the CVT performance (with regard to slip, torque capacity, etc.). Further, the results presented herein examine the ability of a CVT to provide speed control (which traditionally is achieved via RSC), thereby, offering the potential to downsize RSC and thus the overall converter.