Applied Mechanics and Materials Vols. 716-717

Abstract: This paper addresses issues related to robust control for an airbreathing hypersonic flight vehicle. Owing to aero-propulsion couplings caused by the unique structure shape, the model of the vehicle is greatly nonlinear and complex, which presents an enormous technical challenge for control. The nonlinear model is transformed into a linear fractional transformation (LFT) model, and a robust gain-scheduling controller based on linear parameter-varying control (LPV) with full block multipliers is obtained. Simulations illustrate great improvements of the dynamic performance in closed-loop system.

Abstract: The main content of this paper is based on the estimate of LWH(length width and height) dimensions of a machine vision moving vehicle. The information of a vehicle’s length width and height is an important parameter to monitor Road. To achieve non-contact rapid detection of the parameter of a moving vehicle’s size, can effectively improve the efficiency of the road monitoring and provide effective technical means for China's road transport management department. First get the vehicle in sequences image and extract the vehicle from background. Then, we transform the two-dimensional image to three-dimensional image with a simple projection model for getting the parameters of the length, width and height of the vehicle. Experiments show that the accuracy of the test results of this algorithm is relatively high.

Abstract: With the development of social, people’s requirement for the quality of life is higher and higher, for the convenience of life, people introduce more and more lighting equipment in various places, and lighting in the proportion of energy consumption is increasing. This design based on PLC to set an intelligent lighting control system, in order to achieve the purpose of saving energy.

Abstract: Outdoor SVG is the SVG that is derived from conventional SVG, and can be used on sites of limited space. After repeated technical upgrading, this kind of SVG is functioning more and more stably, and is well received by clients. However, since the internal space of outdoor SVG is greatly compressed, and overheat trip still occurs in “extreme environment”. Because the “extreme environment” is just occasional, increase in number or power of fans will greatly increase equipment cost and failure points, most SVG manufacturers are not willing to adopt this strategy. In this paper, the outdoor SVG “overheat capacity reduction” control strategy based on wireless bluetooth humidity and temperature monitoring system is proposed, which ensures that the equipment can run safely in “extreme environment”, saving labor and materials remarkably.

Abstract: In order to achieve greater workspace motion, it’s designed a high aspect ratio 3-PPSR flexible parallel robot, driven by a piezoelectric motor, connected by flexible hinges, which has the advantages of simple structure, non singular, seamless, high motion precision. Because of the stiffness of the system directly affecting the motion accuracy, load bearing performance, according to the characteristics of high aspect ratio flexible hinge, It’s established the mathematical model of flexible hinge through finite element method. Using method of integral stiffness, conbined coordination equation with force balance equation, the flexible stiffness model of system is obtained. Finally, through using Ansys, it’s confirmed the validity of the theoretical model by comparing of the theoretical stiffness model results with the finite element analysis of the model results, to provide a reliable guarantee for optimization and analysis of kinematics and dynamics of flexible parallel robot.

Abstract: Control strategy under unbalanced and distorted grid voltage is one of the most significant tasks for grid-connected inverter (GCI). In order to guarantee that the grid current meets the related IEEE Std.929-2000, a new control scheme was presented. Firstly, the typical model of GCI was presented. Secondly, the GCI control model based on PI-QR controller in synchronous reference frame (SRF) was built. Finally, the system’s simulation was conducted under distorted and unbalanced grid voltage. The results demonstrate the effectiveness of the presented control strategy.

Abstract: Picking and placing products manually on the production line has flaws of inefficient, it takes a long time, slow, unsafe, Non-flexible, high labor intensity. A gantry robot system is designed, which includes the gantry robot, conveyor belts and its control system base on PLC. The development of this system is to show the application through PLC, and then the efficiency of the system improved effectively. It provides an effective design for improving the system.

Abstract: In large-scale thermal power plants, the control of boiler main steam temperature functions as an indispensable part to improve the economic efficiency and ensure the unit’s safety. Currently, the main steam system is always characterized as a dynamic system with big delay, large inertia and huge uncertainties. Considering the characteristics above, the Active Disturbance Rejection Control (ADRC) is designed and serves as a creative solution to the problem of main steam temperature control. In this paper, a guiding temperature signal is adopted as an auxiliary feedback signal, which constitutes the cascade control loop of ADRC-PI.

Abstract: To avoid the fuzzy rules getting into “rule exploding” in fuzzy control system, a fuzzy control rules optimization algorithm based on compatibility coefficient is proposed. The method defines the compatibility coefficient of fuzzy rules, and the compatibility coefficient matrix is used to be the heuristic information in ant colony algorithm. Ant colony algorithm is used to optimize designed complete fuzzy rule base. Simulation results show that the fuzzy rules have good compatibility and control performance.

Abstract: Control problem of mechanical cutting is a development bottleneck of processing technology of robot. As compared to the simple mechanical process, the control process of automatic processing trajectory for cutting robot is relatively complex. This paper uses the CAD/CAM integrated control system to control the robot cutting process, which realizes the integration design of robot machining process. The extraction of G code is through the VC program, and then it uses MATLAB to do data analysis, which completes the design of process parameter for cutting path. Finally we use ADAMS simulation to forecaster the process parameters and machining process, through the analysis of the data it improves the machining accuracy. And it provides a theoretical reference for the research on mechanical automation process.