Advanced Materials Research Vols. 317-319

Abstract: This paper research on an electromechanical hydraulic mixture control system used in large scale die-forging press, based on the national major science and technology project (2009ZX04005-011). This mixture control system used in press machine accomplishes pressing, pressure-keeping, return. The control system uses hydraulic oil to control three-position five-path slide valve as hydraulic system main valve, for drive system of giant die forging press is characteristic of ultrahigh pressure and large flow, high power. This control system consists of two parts: firstly, establishing electromechanical hydraulic mixture control model by adding electronics and feedback section to servo slide system. Secondly, combining existing slide control hydraulic cylinder model and server slide system form main circuit closed-loop control system. The last but not least, Computer simulation was conducted by matlab got the ideal control curve.

Abstract: This paper research on a new fault detection method used in large scale die-forging press, based on the national major science and technology project (2009ZX04005-011). This method combines fault tree analysis (FTA) with artificial neural network (ANN), it need to pick up training samples of ANN from fault tree constructing by analyzing system first. An effective network model can be achieved through using BP algorithm to train the samples based on the tree-layer feed-forward network structure. This network model can output fault reasons according to fault symptoms.

Abstract: Hardware-in-loop simulation (HILS) is an important approach to the development of Unmanned Aerial Vehicle (UAV) systems. In this paper, a complete HILS system for UAV was constructed based on the dSPACE real-time simulator. To simulate the real world situation, problems such as the GPS signal and accelerometer signal imitation were addressed in the dSPACE framework. The HILS simulation of a UAV’s take-off process was exhibited with comparison to the digital simulation; the results show effectiveness of the proposed HILS system.

Abstract: A novel vector control system of the split double-rotor motor based on indirect vector control principle has been proposed. The mathematic models of the primary machine and the secondary machine are set up respectively. Through the coupling of the two models, the system model of the split double-rotor motor is build. Matlab software is used for the simulation and analysis of this indirect vector control system. According to the simulation results, the validity of system model is proved with nicer static and dynamic capability, and without steady-state error in stable state. These are important to analyze and design the double-rotor motor. Furthermore, the results provide the basis for simulation and apply of double-rotor motor in HEV.

Abstract: A novel approach for probabilistic timed structure that is based on combining the formalisms of timed automata and probabilistic automata representation of the system is proposed. Due to their real-valued clocks can measure the passage of time and transitions can be probabilistic such that it can be expressed as a discrete probability distribution on the set of target states. The usage of clock variables and the specification of state space are illustrated with real value time applications. The transitions between states are probabilistic by events which describe either the occurrence of faults or normal working conditions. Additionally, the passage of discrete time and transitions can be probabilistic by mean of the theory of expectation sets to obtain a unified measure reasoning strategy.

Abstract: The hardware control system of the 5-UPS/PRPU PMT (parallel machine tool) with redundant actuation was reconstructed to realize its hybrid force/position control, which was based on the primary “IPC+PMAC motion controller” system mode. Meanwhile, more perfect open type PMT control platform was constructed. Visual Basic language was used to realize the force servo control of the redundant limb and the relevant experiment was completed in the primary CNC system, combining with the PAMC motion controller library function. The results show that the force servo control strategy is exact and the newly designed hardware control system is effective, these results also provide feasible hardware basis and control method to realize the hybrid force/position control.

Abstract: In this paper, the main research direction of optimal control is aimed at mathematical model of small unmanned helicopter longitudinal channels. Genetic algorithm was used to optimize the select of control law which is tolerance, make small unmanned helicopter operate as given requirements, and make the given performance index achieve optimal value (minimum or maximum). This paper will introduce the optimal control theory to attitude control system of small unmanned helicopter. The simulation results prove that this method can well satisfy the control accuracy requirement of small unmanned helicopter attitude system.

Abstract: This paper presents a novel approach of the track following control for a 7 degrees-of-freedom (DOF) manipulator by ADAMS, which is to solve the accurate transfer function being hard to set up. The simulation results show that the 7-DOF manipulator has better tracking performance by proportional-integral-derivative (PID) control when the moving rate of the end-effector is 215mm/s. In addition, the virtual prototype established in ADAMS can replace the traditional transfer function as the controlled plant of track following control system. Using the parametric design and optimization analysis in ADAMS, we can find the plausible control parameters more quickly.

Abstract: Though computer technology has brought about virtual manufacturing to expedite design and analysis through simulation and visualization, machines remain essential, as ultimately products need to be made. This paper presents a new type of 5-axis parallel machine tool based on a 3 degrees of freedom parallel platform manipulator with base mounted prismatic actuators. This machine tool is different from the Stewart platform type parallel machine tool in that its feed motion in X-direction is realized by the worktable on which work-piece is fixed and the parallel manipulator sliding on the gantry structure of the machine tool is responsible for the translation along Y-direction instead of the movable platform of the manipulator. Due to this special architecture, the workspace in X-direction and Y-direction of the new machine tool is enlarged greatly. And its rigidity is higher because of the adaptation of gantry structure. This machine tool is controlled by a PC based NC system in simultaneous 5 axes control mode.

Abstract: Nowadays, the stability of the mixed solution usually is improved by adding appropriate amount of emulsifier needed in many oil products, in order to reach the better effect of solution mulsification. In this paper, using silica gel column seperation to isolate pure ingredient of the emulsifier component, and all molecular structures prepared on silica gel were characterized by Fourier transform infrared (FTIR) spectum and silid-state 1H NMR experimental observations.