Applied Mechanics and Materials Vols. 278-280

Abstract: This article introduced the design of motion controlling module in the brand laser incising automatically system, and discussed how to conform the angle that is used in coordinates transform and the current location of laser head using a LED.This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Abstract: Precision motion trajectory tracking control of a single rod pneumatic cylinder driven by two proportional pressure valves is considered. Rather severe nonlinearities and uncertainties exist in the dynamic modeling of the system. In order to guarantee both the transient performance and final accuracy, a nonlinear adaptive robust controller is developed. The proposed controller comprises a sliding mode controller (SMC) and an on-line recursive least squares estimator (RLSE). The RLSE is utilized to reduce the extent of parametric uncertainties, and the SMC is adopted to attenuate the effects of parameter estimation errors, unmodelled dynamics and disturbance. Since pressure in each cylinder chamber is controlled independently, output stiffness regulation can be achieved by changing the nominal control voltage. Several experiments are conducted to test the proposed control strategy, and the results well fulfill the design requirements.

Abstract: This paper introduces the actual method for adjusting the real-time PID parameters in PLC through the BP neural network PID algorithm in Matlab. Basing on OPC communication mode, the zinc refining electric furnace temperature BP neural network PID on-line control system is designed by combining Matlab algorithm process and industrial control process. In this way, the precision and real-time control of the electric furnace temperature will be improved, and production consumption and cost can be reduced effectively.

Abstract: This paper presents a parametric optimization approach to solve reentry guidance. Due to the various constraints imposed on the trajectory, original guidance problem can be converted into an optimal control problem with a merit function to be minimized. Direct implementation of method of variation and is too complex to get a reasonable result, while a numerical parametric optimization approach is feasible and efficient if we choose appropriate control variables as the optimization parameters and effective optimization algorithm. A simulation of the approach is performed to show its validity on reentry guidance problem: as the value of merit function converges to acceptable threshold, all constraints are hold.

Abstract: One challenge in the use of semi-active technology is in developing nonlinear control algorithms that are appropriate for implementation in full-scale structures. Based on the basic characteristics of magnetorheological (MR) damper, the structural control algorithms are introduced. The nonlinear control algorithms are systematically reviewed from the aspects including clipped optimal control, LQR control, and Lyapunov stability control. Finally, the existed problem in application and the future developing in research on the structural control algorithms are summarized respectively.

Abstract: The load changes of working machinery in the running process will certainly result in poor matches in the characteristics of the transmission system. For the issue, this paper studies the adaptive power control model and algorithm. The adaptive power control system is developed using the adaptive power control technology based on the load identification, and is applied in the full AC electric forklift and the CNC band sawing machine. The variable frequency system and intelligent control method based on the integration of the load characteristic recognition and control proposed in this paper, adaptively adjust the parameters of the PID controller according to the load characteristic parameters identified real-timely for the transmission system of the working machinery, so as to achieve the best performance matches, the highest effectiveness and lowest energy consumption of the entire transmission system.

Abstract: A new vehicle stability control method integrated direct yaw moment control (DYC) with active front wheel steering (AFS) was proposed. On the basis of the vehicle nonlinear model, vehicle stable domain was determined by the phase plane of sideslip angle and sideslip angular velocity. When the vehicle was outside the stable domain, DYC was firstly used to produce direct yaw moment, which can make vehicle inside the stable domain. Then AFS sliding mode control was used to make the sideslip angle and yaw rate track the reference vehicle model. The simulation results show that the integrated controller improves vehicle stability more effectively than using the AFS controller alone.

Abstract: Abstract. Parison wall thickness electro-hydraulic control system is the core of parison wall thickness control for large scale blow molding machine. In order to ensure the equalization of the wall thickness for the hollow products and to save material, in this paper analyzed the project of the parison wall thickness electro-hydraulic control system for blow molding machine and designed the parison wall thickness electro-hydraulic positional closed-loop control system which adopted the high performance proportional valve. Through simulation analysis and experiment, it was proved that through positional feedback control of the core of high performance proportional valve, the response frequency of the electro-hydraulic proportional valve can be improved so as to improve the dynamic quality of the system, achieved the requirement for higher control precision and dynamic response and satisfied the requirement for fast speed and control precision for plastic extrusion-blow hollow molding machine. It can be seen that it is effective to adopt the closed-loop control strategy for Parison wall thickness electro-hydraulic control system and more important, it has operation significance for improving the quality and ensure the precision of the products.

Abstract: Since most of the control systems in real industrial production are fractional，there is necessery to propose fractional order PIλDμ controller, which extend the traditional integer-order PID controller to fractional order, it has increased two free degree: Integral-order λ and differential-order μ, to more accurately control those complex systems. At the same time analysis the performance of fractional order PIλDμ controller in frequency domain. Especially,the two degrees’ effect to controller.

Abstract: An automatic control system of sampling package for sample coal is designed according to the realities of sample coal powdery materials which are based on controller (PLC). The system can realize the functions of random sampling, auto-weighting, auto-packaging, and auto-sealing off. It also can adjust waste less, control convenient, zero point self-tuning and dynamics weighing measurement. It can be used in sampling weighing package of sample coal. Various performance indicators can be stably and reliably used in field.