Applied Mechanics and Materials Vol. 431

Abstract: Algorithms for motor control unit in electric vehicles are being actively developed with consideration given to safety and reliability these days. Faults during driving are a critical problem that is directly linked to the safety of drivers, and studies on fault detection of control units in various situations are needed. This study investigated the faults of control units in a signal level interface with a dynamic model of drive motor and the real-time interconnection of motor control unit and HILS (hardware-in-the-loop simulation). It was found through real-time simulation that simulating the fault conditions with the sensors of motor control unit could reveal different characteristics of motor control unit. Furthermore, vehicle driving simulations with electric motor control were performed. The results of this study are expected to help the development of electric motor simulations and the evaluation of MCU and control algorithms.

Abstract: The energy conversion and the step-down voltage waveform of apiezo transformer are required to achieve an optimal working condition of the resonant frequency. To fulfill this requirement, a reliable and precise instrument is needed to scan the resonant point of the piezo transformer such that its output power performance can conform to the required specification. This paper describes the design and modeling of a new step-down piezo transformer deployed in NSRRC. This transformer is capable of delivering energy conversion with a highly efficient performance, better than that of a traditional transformer, and the voltage transfer ratio is correct. Use ofa simulation circuit model to develop its driver circuit is included in the design of this new step-down transformer. It has been tested and proved to work satisfactorily in power conversion with excellent efficiency and reliability.

Abstract: The aim of this article is to achieve the application of single chip microcomputer in SCR light regulation circuit. Its control part is simplified by analyzing the principle of SCR light regulation circuit. According to control function, the design scheme that let the single chip microcomputer bring about a good control function in SCR light regulation circuit is proposed. The experiment results demonstrate this design is practicable. The light regulation function could be realized by the single chip microcomputer.

Abstract: 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.

Abstract: In order to facilitate the advanced measurement system with real-time interaction in smart grid and to satisfy the requirements for power quality management, a wireless ad hoc smart metering system for power quality using Internet of things (IoTs) technology is presented in the paper. By utilizing the energy metering module to collect energy information, the ZigBee ad hoc networks to transmit energy information, and the user monitoring terminal to support power grids management, the proposed system is able to efficiently realize the power quality information collection, transmission, processing and sharing. Experimental results demonstrate that the system performs real-time and precious monitoring of the distributed client power quality information, together with friendly and intelligent interaction capability.

Abstract: This paper tries using Inventor software to create the three-dimensional model of the the palletizing robots operation rear arm, and then importing this model to ABAQUS to proceed finite element analysis of statics. We verified these two softwares interface issues, the correctness of the calculation method and the steps by analyzing. From analyzing we found the security issues in the operation rear arm. Then we checked and optimized the model for the issues. From the result, the optimized model meets the strength design requirements. The study has reference value for engineering and technical people.

Abstract: This design uses the Arduino development board as a controller. The control program of servo motor is developed. It could control multiple servos for sub-periods. With the aid of the secondary development of software such as servo controller, the program is written in the development board directly to control servos. This mode allows the robot independently complete the required action in offline state, which is advanced.

Abstract: Walking robot has complicate structure and strong ability to adapt ground conditions, and it is difficult to control. To realize dynamic walking of the humanoid robot, we have to establish robot dynamic models, design the control algorithm for gait and the stability postures. In this paper, study dynamic model and control system of a 7-links biped robot, build parameterized simulation model of biped walking robot, proceed gait planning and simulation experiments in the simulation surrounding, and get some experiment results. Compare the experiment data with the theoretic stable region and confirm that the biped walking robot as leg mechanism has good stability of static walking, and provide theoretic and data information for further work.

Abstract: Proposed an uncertain environment path planning method for mobile robot in the presence of moving obstacles. Combining the global planning with the local planning, this dissertation presents a new approach to on-line real-time path planning with respect to the dynamic uncertain environment. With current sampling position, the autoregressive model predicts motion trajectories of moving obstacles. And the predicted positions are treated as instantaneously static. So moving obstacles in the predicted positions can be considered as static in the path planning process. Simulation examples demonstrated the effectiveness, feasibility, real-time capability, high stability and perfect performance of obstacle avoidance.

Abstract: The ESP hardware in the loop simulation test bench has been built based on LabVIEW PXI. In the paper a 7 DOF vehicle model has been built and the ESP PD control algorithm has been designed, which characteristic parameter is yaw rate and sideslip angle. A sharp double lane change test has been done by using the experiment bench built in the paper, the results of which has proved that the hardware in the loop method is an effective means to detect ESP controller reliability, test control algorithm validity by establishing the virtual extreme test site and match the controller parameters.