Applied Mechanics and Materials Vols. 313-314

Abstract: Various path planning algorithms have been used to deduce optimal manipulator joint trajectories for spacecraft attitude regulation using arm motion. However, few papers have considered the unexpected factors when applying those planned path into actual situations. Even though conventional feedback control would drive the arm dynamics to the desired one, this only appears when time evolves to infinity which means during some time the actual joint paths deviate from the desired ones. However, the spacecraft attitude change is related to the entire process of arm motion. So, even a small deviation of the actual joint movement from the desired one would cause the failure of spacecraft attitude regulation task. In this paper, sliding mode control technique is adopted to force the actual joint moves along the desired trajectory from the start. Further, saturation function is used to eliminate the chattering phenomenon. Moreover, the relation between attitude regulation accuracy and controller parameters is deduced which gives instructions in tuning the controller parameters. In the end, numerical simulation is conducted to show the feasibility of the proposed controllers.

Abstract: Electric vehicles represent the direction for development of future vehicles. The control system for battery component is one of its key technologies and its performance has a vital impaction on the whole vehicle. In this paper, the state space description method is adopted to model the control system for battery component of PHEV. Taking equivalent fuel consumption and power tracing accumulated error as optimize object, the control system is testified and evaluated based on both ECE and NewYork drive cycles. The results indicate that the control system has good driving performance, good fuel economy and charge sustainability, thus satisfying the requirement of electric vehicle application well.

Abstract: To compare and improvediesel engine emission performance by different injection methods, a multi-pointnatural gas in-system and a one-point injection system were developed. In bothsystems, the electromagnetic valves are used to control injection and totalquantity. The system was designed for the type X6130 diesel engine. The testresults showed that the multi-point system has great advantages in the aspectsof emissions. To adopt multi-point gas injection is a better way to reduce theemission.

Abstract: The EtherCAT real-time Ethernettechnology that proposed by Beckhoff Company, is now widely used in industrialautomation and in motion control fields. Inthis paper, a slave moduledesign adopted the backplane type iscarried out, based on in-depth study of the ET1200 chip and the Ebusprotocol, including a communication board EKM which regards PIC microcontrolleras microprocessor, a board EKS-IO which is used for digital IO expansion,and a stepping motor control boardEKS-S. Then the overall debuggingand application on a warehousedevice show that the EtherCAT slave controller meets the performance requirements of EtherCAT buscommunication, with better reliability and a certain practical value.

Abstract: In order to increase the accuracy and real-time of grey prediction fuzzy direct torque control system, an improved grey prediction fuzzy direct torque control method was advanced. The equal-dimensional new information model was used to construct the new grey prediction model. The position angle of motor stator flux was divided into sectors, by which the simplified fuzzy algorithm was obtained. The simulation results show that the improved method can greatly overcome the shortcomings caused by the original method, such as the overlarge dimensions of original time sequence and the decrease of effective information amount due to the lasting of time. The calculation quantity in prediction process is reduced. The precision of prediction and the real-time of fuzzy control system are increased. The instability of stator flux is lowered and the speed respond of motor is meliorated.

Abstract: Basing on the analysis, the functions of the V2G system, such as peak shaving, frequency adjusting, UPS and disturbance stabilizing, are discussed in this paper. And the key technologies of V2G are put forward according to the ongoing research and demonstration. The main research route and methods are established, which includes the nonlinear multivariable decoupling method of power battery pack, the integrated process control method of EV energy and driving system, the statistical characteristics of EV large-scale demonstration and the control theory and method.

Abstract: In this paper, the collaboration of CPG networks with the feedback control system which are composed with the maximum hopping height detector and the Proportional Integral (PI) controller as an engineering application for the CPG network is proposed with the developed control systems. By adding the feedback loop through the feedback controller, the developed quadruped hopping robot not only can generate the continuous hopping performances but also can control the desired hopping height. As the result, the effectiveness of CPG networks to keep the stability of the developed quadruped hopping robot besides of confirming the validity of using reference height control system to generate hopping capability at different reference height, respectively.

Abstract: The purpose of this paper is to discuss a modeling and control of stand- alone photovoltaic system using voltage mode control maximum power point tracking (MPPT) method. The PV module was modeled based on the parameters obtained from a commercial PV data sheet while voltage mode control was modeled using simulink block model. A DC-DC boost converter was chosen to step-up and regulates the input DC voltage of the PV module. The voltage mode control (VMC) maximum power point tracking model was simulated and compared with perturb and observe (P&O) maximum power point tracker in order to validate the performance of output results. Results showed that the voltage mode control maximum power point tracking model yields the similar performance as produced by the photovoltaic system controlled by perturb and observe maximum power point tracking algorithm. The simulation is made to analyze the voltage, current and power generated under the changing irradiant and temperature condition. As a conclusion, the voltage mode control technique is possible to implement which yields the similar performance as the results from conventional MPPT method.

Abstract: This work is a study of UPQC in a transient regime, using a new method of identifying disruptive currents based on continuous power, with a comparison of performance of two controler PI and IP of the two voltage inverters. The results of this work showed that this new method is very efficient, and the regulating IP has be able to keep the value of the continuous tension to the close to his value of reference.

Abstract: Finite-time stability concerns the boundless of system during a fixed finite-time interval. In this paper, the problem of finite-time stabilization for switched discrete-time systems is addressed. Both the fast switching and slow switching case are considered. In fast switching case, the designed state feedback controller combines controllers for each subsystem and resetting controller at switching instant, it is shown that the resetting controller can reduce the conservativeness on controller design. Under slow switching, state feedback controller is designed with admissible average dwell time. Several numerical examples are given to illustrate the proposed results within this paper.