Applied Mechanics and Materials Vols. 336-338

Abstract: For wheeled robot motion control, brushless DC motor speed control system of wheeled mobile robot parameters time-varying, nonlinear, uncertainties and other factors, with the traditional PID control algorithm is difficult to meet the control requirements this article combination of traditional PID control technology and fuzzy control technology, is designed based on the parameters of fuzzy self-tuning PID DC motor control. This article describes the principles and design steps of fuzzy self-tuning PID Matlab simulation of the control program, the results show that the controller has achieved a good speed and stability.

Abstract: This paper deals with chaos synchronization of the Liu chaotic system with fractional-order. Based on the fractional-order stability theory, an adaptive sliding mode controller has been constructed to realize projective synchronization of fractional-order Liu chaotic system with unknown parameter. An illustrative simulation result is given to demonstrate the effectiveness of the proposed sliding mode controller.

Abstract: In allusion to the issues of system line state transfer that may arise in adverse weather, a new method of probability calculation is proposed. In a statistical analysis, this article firstly defines that failure probability of the first line subjects to Poisson distribution. Secondly, we figure out the power flow transferring distribution after first line fault, according to the method of Flow Transferring Relativity Factor (FTRF), and combine with the protective possibility so as to build the probability model between the load rate and protection action. Then, the method defines the severity of line load rate. Finally, the approach constructs the line state transition probability model considering direct and indirect factors in adverse weather. The effectiveness and correctness of the proposed method are verified by simulation based on IEEE 39-node system.

Abstract: MR damper (magnetorheological damper) has broad application prospects, and equivalent damping coefficient is very important of its dynamic characteristic analysis. Based on the modified Bouc_Wen model, the performance of MR damper was analyzed and the equivalent linear damping coefficient of MR damper was calculated. Based on simulation date of the modified Bouc_Wen model, the relationships between the equivalent linear damping coefficient of MR damper and the parameters of control voltage and MR dampers movement amplitude were established by the curve fitting regression analysis method. Verification results prove that the equivalent linear damping coefficient model has higher accuracy. For the vibration systems using strongly nonlinear MR damper, new model can effectively improve the efficiency of calculating the vibration analysis and the stability of the system in a certain frequency. At the same time, the model provides a theoretical basis for the application of MR damper control.

Abstract: Model for drive system of four-wheel-drive electric vehicle was investigated. By combing the balance equation for the vehicle movement with the equation of motor mechanical properties, a mathematical model of driving system of electric vehicle was established, PI control strategy was used for the optimal control and the model was simulated by the software Matlab/Simulink. The simulation results show that the mathematical model of driving system of the electric vehicle can represent the vehicle running states accurately.

Abstract: Based on the analysis of the mathematical model of the three-phase asynchronous motor and sine pulse width modulation principle, According to the theory of asynchronous motors vector control , software is building simulation model of asynchronous motors vector control system according to the rotor flux in Matlab/Simulink, analysis dynamic characteristics of rotational speed, torque and stator current ,provided the simulation results of the control system, verify the vector control is effective and feasible.

Abstract: Inverted pendulum system is a complex, non-linear and uncertain high-order system. It is a simple model of the rockets vertical attitude control and two-legged walking robot control. It is used to study and validation of different control methods. The paper analysis the non-linear inverted pendulum system, then deduces sufficiency conditions of the existence of controller with output feedback and designs controller. It utilizes MATLAB software to get the answer. The feasibility of control method and robustness of controller are demonstrated by numerical examples.

Abstract: Due to its excellent performances, the combined diesel and diesel (CODAD) propulsion plant is widely applied in modern medium-sized marine vessels. An experimental test rig of marine CODAD propulsion plant is built in the laboratory so that characteristics of the CODAD propulsion plant can be investigated in detail. Modeling of the CODAD test rig is presented at first in the paper. Validity of the model is proved with the experimental data. In order that an optimized merging process of the test rig can be accessed, a simulation analysis based on the model is carried out to choose rational engaging parameters of the clutches.

Abstract: FMI is put forward by ITEA2, the target is the realization of cross platform, many areas of joint simulation. FMI is a standard interface which is used to implement the simulation. It is complete the following parts of specific functions: To load FMU model which is generated by other software , edit and compile the model , then download to target machine which VxWorks is running on; Realization of seamless connection with VxWorks target machine; Supporting the simulation model which is build by C/C++ language . Through this platform, FMU model and C/C++ model can be used in the Real time operating system of VxWorks, and realize the real time monitoring of simulation data, which make it becoming possible to realization of joint simulation.

Abstract: To reduce the calculation brought by attitude angle and attitude matrix matching as well as to insure the transfer alignment accuracy, the paper gives a method that uses slave inertial navigation system (SINS) error model as the state-space model. The complexity of the state equation can be simplified by this method, for the lever-arm effect can be compensated in the observables rather than considering it in the equation of state, in which the inputs do not need to be brought in the equation of state; On the basis of element matching of the attitude matrix with SINS and master inertial navigation system (MINS), the paper raises row elements sum matching method of attitude matrix, which has simpler structure of the observation matrix and lower dimension compared to attitude angle matching and element matching of the attitude matrix, so as to decrease filtering computation. Simulation results have proved that the model and matching algorithm in this paper are effective and the system can achieve higher transfer alignment accuracy.