Applied Mechanics and Materials Vols. 556-562

Abstract: In order to improve the performance of the cars, an optimization algorithm of transmission parameters that take into account automotive dynamic and fuel economy based on genetic algorithm was presented in the paper. Firstly, the origin underway accelerate time was chose as the dynamic target function, and the 100 kilometers fuel consumption of 15-cycle driving was used to evaluate fuel economy, and the two objectives functions were putted into a comprehensive objective function. Then, the constraints were established using the requirement of automobile power performance and transmission design, and the genetic algorithm was adopted to do the optimization. At last, a simulation experiment was design to confirm the validity and effectiveness of the proposed method.

Abstract: In this paper,we have studied the overtaking process on the two-way four-lane highway in China by using the theory of multi-objective programming, establish a traffic volume model and evaluate the safety of overtaking. In order to working out the optimal offset angle, we also establish the function equation between safety coefficient, traffic flow and the offset angle during overtaking or lane-changes. Finally some safer and smarter overtaking rules are put forward by combining the offset angle and the security constraints, thus improving the safety, intelligence and traffic flow.

Abstract: Control strategy of inverter is the foundation of microsource’s power control. Based on a typical system setting method, double-loop control system of LC filter and inverter for voltage-source inverter in microgrid is designed. The feasibility is verified via the simulation.

Abstract: In order to achieve the automation of industrial production, this paper designed a control system which used a Siemens S7-412-3H PLC as the core controller, the combination software of WINCC STEP7 and PCS7 was used for the mixed solution control system, and the control system showed the dynamic magic form of the control principle. Keywords: Siemens S7-412-3PLC; PCS7; Mixed solution

Abstract: To control wheeled inverted pendulum is a good way to test all kinds of theories of control. The optimal control based on MATLAB is used to control wheeled inverted pendulum, and the control law is designed, and its feasibility is verified. However the mathematical model of the wheeled inverted pendulum is linearized and inverted pendulum is a high-order nonlinear system, both of them exist errors. Then the collaborative simulation of MATLAB and ADAMS is also used to control wheeled inverted pendulum, in which wheeled inverted pendulum is built up to virtual prototype model in ADAMS based on virtual prototype technology, and the control law designed from simulation of MATLAB is consulted. At last the results of simulation demonstrate the correctness of optimal control of wheeled inverted pendulum, and it also indicates the way is worth advocating in the study.

Abstract: The density and reserve of the weighted mud play a decisive role in dealing with the unexpected oil well blowout, how to quickly mix out the weighted mud with desired density and volume is a problem which is urgent need to be resolve by each drilling crew and the petroleum equipment manufacturing enterprises. On the base of the original manual equipment for mixing weighted mud, this paper designed an automatic control system which can make the weighted mud mixed quickly and automatically.

Abstract: This paper proposed a fault-tolerant control (FTC) for nonlinear control-affine uncertain MIMO systems. The proposed controller is no need for on-line fault detection and diagnosis unit, and inexpensive to compute. An adaptive FTC designed method based on Lyapunov-like approach is developed to overcome the affect of parameter uncertainties, matched and mismatched disturbance, and actuator failures. And the theoretical analysis demonstrates that asymptotical tracking error convergence would be guaranteed by the controller. Numerical simulations are provided to validate and illustrate the benefits of the proposed control scheme.

Abstract: Based on the ballistic characteristics of underwater rockets, the initial ballistic acceleration identification, dynamic pressure threshold and the fixed revolution number of sensitive turbine were chosen as three environmental excitation arming signal. Safety and arming logic circuit to meet the rocket ballistic characteristics was designed and using the Markov theory to model and analyze the circuit. A good match was achieved between ambient arming excitation with arming insurance and logic. And the safety of the whole trajectory was ensured. Finally, the circuit simulation experiments was designed, the results show that the circuit can meet the safety requirements of the fuze.

Abstract: To reduce the negative impact of the unexpected motion in the heave direction when hoisting on the sea, a heave compensation system is indispensable for a floating crane. In this paper, a genetic algorithm-based PID controller is presented to improve the dynamic performance of the heave compensation system. A simulation model of electro-mechanical and hydraulic integrated system of the heave compensation system is built. The simulation results show that the genetic algorithm-based PID control system improves the dynamic characteristics, strengthens the stability and rapidity of the system and even ensures the control effect of the heave compensation system.

Abstract: A novel adaptive sliding mode control is proposed to guarantee high precision and robustness of servo system of rocket launcher. An improved PID switching function is designed to smooth control input, meanwhile Chebyshev neural network is adopted to identify the system’s Jacobian information, and parameters of controller can be acquired by self-tuning law which can be derived by Lyapunov theory. Simulation results show the control input is chattering-free, and both load disturbance and parameter perturbation can be compensated.