Applied Mechanics and Materials Vols. 631-632

Abstract: Aiming at the water bath temperature control system of great inertia, pure time-delay, non-linear and time changeable characteristics, a kind of simple and practical control algorithm is put forward in this paper：ITGC (Intelligent Track Guiding Control). ITGC and PID control system was carried out respectively step response test and the disturbance test in the MATLAB/SIMULINK simulation platform; And can be successfully applied in practical projects. Studies have shown that: ITGC control on the overshoot and adjustment time are better than the conventional PID method, the control scheme has stronger robustness and anti-jamming capability under various operating conditions and an increase in external disturbance case. Successfully resolved the difficulty of time-varying parameters and large lag in the temperature control system.

Abstract: Hearth negative pressure is an important indicator of steam boiler. It's stable or not only directly affect the coal’s combustion efficiency but also an important parameter to ensure safety production. In the process of control, it has the characteristics of time-varying, nonlinear and coupling. In order to solve this problem, this thesis introduces Intelligent Track Guide Controller(ITGC) control scheme. ITGC principle is that transform the classic PID’s "objective control" to "process control". The ITGC simulation results were compared with PID, and simulation results show that: ITGC control scheme is better than the classics PID scheme in overshoot and settling time. Under a variety of conditions, the ITGC control scheme have an anti-interference ability. Applying ITGC to steam boiler’s hearth negative pressure control, it is fully capable of such a control system which have a multi-couplings and time variation.

Abstract: In the potentiometer as the Angle sensor monitoring and control system, the relationship between voltage sampling value of potentiometer and the angle actual value is linear, but there are more interference in the measurement and control environment, contributing to the relationship of the actual value and the sampled value deviating from the set of linear relationship. In order to improve the performance of the controller, the controller operating parameters need to fix, this paper uses the method of least squares treatment sampling data to correction controller parameters. Experiments show that the curve fitting accuracy improve greatly after data processing.

Abstract: According the characteristics of the tasks and the messages transmitted in Networked Control System,the CPN model of NCS is established. The model is detecting by using the simulation facility provided by CPN tools. It indicates the model is validated. Keyword: 1553B bus,Networked Control System,Coloured Petri Nets

Abstract: As for the aperiodic tasks of node in network control systems, the FC-ABS (Feedback Controlled Adaptive Bandwidth Server) scheduling algorithm is designed. The different scheduling methods are used according to time characteristics of aperiodic tasks, and feedback scheduling is used to mitigate the effect of aperiodic tasks on periodic tasks. The simulation results show that the method is effective. Keyword: Network Control Systems; Server Scheduling; Feedback Scheduling; FC-ABS.

Abstract: To represent the physical characteristics of the micro flapping wing rotor and to further control it, a dynamic model of the electromagnetic mechanism is necessary to be built. Lagrange’s equation method is used to model and analyze the relationship of input and output system parameters. Analysis shows the flapping frequency is the more critical one to decide the efficiency of the rotation of mechanism. Finally, simulation and test verify the mathematical model of its dynamics phenomena for future application.

Abstract: The target of this paper is to simulate the stretching process of sheet aluminum profile using ABAQUS/CAE software. Stretching investigations were conducted using the finite element method. The main contents of research work include simulation software, which give in details the stretching steps followed to obtain an optimization springback .This paper focus on the influence of stretching force and angles on springback of aircraft panel.

Abstract: According to the key parameters of automobile seats’ pendulum machine, a calculating method considering the anti-collision is proposed. Then the mathematical modeling of the pendulum system with actual working condition is established based on rigid body dynamical theories. With the momentum law and collision theory, a equation describes what condition for the center of collision and the point of impact to coincidence is derived. For system optimization, the minimal pendulum weight is taken as the objective function, multiple parameters as design variables, the pendulums’ optimum parameters are calculated by using mixed penalty function method.

Abstract: The carrier generates complex movement on the sea subjected to wave interference. The motion of carrier will affect the measurement precision of the shipboard radar. In order to reduce the influence of carrier motion on the accuracy of radar need to establish a model of ocean wave and then establish the motion model of carrier and analysis carrier motion rule of influence on the accuracy of radar. The stationary random ocean wave model also has an important significance in the prediction of the wave, ship dynamic positioning.

Abstract: We selected the Shenhu region in South China Sea as our research area, and use 3D modeling methods to develop visualization technologies oriented to strata modeling of irregular gas hydrate, hybrid rendering of ore bodies and boreholes, and contour extraction. Through real-time display of seismic attribute data volume, 3D geometry building, and integrated modeling of geologic strata and seismic attributes based on these technologies, we accomplished overlay analysis of seismic attributes, and spatial distribution description and detailed geologic feature depiction of gas hydrate bodies in the test area, and acquired good results.