Applied Mechanics and Materials Vols. 668-669

Abstract: Aiming at the features of nonlinearity, time delay, high dimension, big noise and others in the electric furnace smelting process, and the smelting process parameters some control process needs cannot be obtained by sensors, so the online parameter prediction method is of great significance for dynamic optimization control of system. In this paper, by using chaos theory and phase space reconstruction method, based on the idea of data-driven modeling, the temperature prediction model of crucible in the smelting process of ferroalloy electric furnace is established based on multivariate time series. Experiments show that the established data-driven prediction model can well predict the temperature change in the electric furnace smelting process, the root mean square errors of prediction are respectively less than 0.0715,and this has good guidance for practical production.

Abstract: In order to supervise and control the ship power system remotely and automatically, the automatic monitoring system is designed based on Modbus protocol. The system realizes unattended and long-distance concentrate supervision and control of power system, and it manages power automatically. The system has the ability to improve the automation level and to reduce labor intensity.

Abstract: This paper built 5 KVA / 400 Hz medium frequency power supply AC - DC - AC main circuit, Output filter is designed in detail. Based on SPWM control strategy and the voltage RMS feedback loop and PI adjustment, the Matlab/Simulink simulation model is established, and Harmonics are analyzed, the conclusion is obtained.

Abstract: Based on the convex (concave) arc sheet flanging experiment data, the springback prediction research in the sheet flanging was carried out, using radial basis function (RBF) neural network (NN) and the dynamic structure design method. By comparing with the experiment results, the validity of this method was verified.

Abstract: Effective control algorithm can be applied to the real-time control system by the data exchange between MCGS and MATLAB with OPC technology, as a result, a testing platform for advanced control algorithms is established. The paper presents a second-order liquid level control system for research example; the BP neural network algorithm is applied to the control system. The communication process verifies that the data exchange is reliable and the simulation results show the control of the BP neural network algorithm for real-time optimized control process is effective.

Abstract: This paper investigates the co-design problem of both robust integrity and the usage of communication resources for a class of actuator-saturated networked control system(NCS) based on a novel discrete event-triggered communication scheme(DETCS). First, a new model of NCS is established that parameter uncertainty, network-induced delay, actuator saturation and faults, and the state error arising from the DETCS are taken into consideration in a unified framework. Second, based on the model, the set of invariance condition of the closed-loop fault NCS with actuator saturation is proposed, which is the delay-dependent and event-dependent sufficient condition for ensuring the system stability. Then, a co-design approach which includes both robust fault-tolerant controller and the corresponding trigger weight matrix is given via linear matrix inequalities. The reciprocally convex combination lemma and the improved Jensen integral inequality are employed to deal with the derivative terms of the Lyapunov-Krasovakii functional, which can reduce the conservatism and computation of the results. Finally, a simulation example is used to demonstrate the advantage and the effectiveness of the proposed co-design approach, meanwhile, the quantitative relationship between the system performance and the communication resources is provided.

Abstract: In this paper, we first put forward the simulating function of AIS simulator. We give a brief introduction on how to develop AIS simulator, combined with the simulator interface, the simulate of operating process, the calculating of dangerous target’s parameter and the switching of different display mode. The simulator comprehensively simulated the FA-150 AIS equipment and meet AIS training.

Abstract: The core unit of the flight control system being the central part of the Unmanned Aerial Vehicle (UAV) system is the flight control computer playing a vital role in the stability and security of the entire system, which has fast and reliable requirements for system startup. Bootloader is the first section of software code that runs after powering on, mainly responsible for initializing hardware devices. By loading an application or operating system kernel, the bootloader completes the system startup. Based on MPC8280 processor’s hardware platform of the central processing unit of distributed flight control computer, this paper designs and implements a non-operating system boot scheme. Under the boot scheme, an optimal boot scheme aiming at increasing efficiency of software development for VxWorks operating system is provide.

Abstract: The motor described in this paper is a limited-angle torque motor (LATM) used in thermal imaging applications. Based on electromagnetic theory, the formula of motor torque was obtained by analyzing the magnetic circuit and energy of the motor. In the meantime, main factors that affect the performance characteristics of the motor were investigated according to the formulas of motor torque. The simulation of the motor was done using Maxwell2D, a Finite Element Method. The simulation results show excellent agreement with theoretical analysis. The conclusions in this paper may provide suggestions for further work which may improve the performance of the LATM to meet special requirements.

Abstract: To restrain the influence of armature reaction, flux barriers is added to rotor structure and enhance the output power ability of brushless doubly-fed machine. Design scheme of brushless doubly-fed machine with barrier rotor is provided. Based on field-circuit coupled finite element method, The asynchronous operation performance of brushless doubly-fed machine with barrier rotor is studied under the condition of no-load, including adjusting voltage adjusting speed and series resistance adjusting voltage. The prototype is carried out on the condition of no-load asynchronous operation; comparison analysis of simulation speed values and tested speed values is realized. The designed machine is reasonable and reliable.