Applied Mechanics and Materials Vols. 719-720

Abstract: The authors have designed an augmented reality based rigid body motion experiment system (ARRBMES), which could capture the physical motion information from the interaction between the users and virtual rigid bodies in real-time. The launcher and the container of the rigid bodies in this system are all positioned by tag cards, and the initial physical quantities of the rigid bodies are captured and analyzed through the motion information of the launcher tag card. Then ARRBMES will realize the real-time display of rigid body motion and collision events in a virtual-real fusion environment. ARRBMES can simulate the motion of rigid bodies in ideal state which cannot be achieved in the real world. As a result, the users can obtain realistic experience and the system can increase their physical intuition and cognitive experience. Moreover, ARRBMES can obtain physical information from the interaction in real-time between users and the system, which makes it a special Cyber-Physical System.

Abstract: Streamlines in mixed-flow impeller were deduced by solving partial differential equations of continuity, motion and energy; they could be simplified to be logarithmic spiral and parabola in vertical and horizontal sections respectively. Then a mixed-flow impeller was designed and manufactured, its vane had a logarithmic spiral and its shroud had a parabola form. Computational fluid dynamics (CFD) demonstrated that the streamlines in the impeller were coincided with the vane and shroud; particle image velocimetry (PIV) exhibited also that the streamlines in vane channel were really logarithmic spiral at the designing point of pumping flow rate and pressure head. It concludes that both theoretical and experimental methods presented in this paper are informative and convincing, and thus are worthy to be investigated further.

Abstract: Take-up roll is a key component employed in amorphous ribbon production line. The roll should supply enough adhesion fore to take up the flying ribbon with a high speed. In this paper, a novel magnetic take-up roll (MTUR) is proposed. Optimize the structure parameters with a finite element method to obtain enough and stable magnetic adhesion force (MAF). The different simulation models are established to calculate the performances of the MTUR. A prototype of the MTUR was manufactured and tested. Experiments prove that the optimal MTUR can generate MAF to overcome the resistant force that amorphous ribbon suffering in take-up process in certain air gap range

Abstract: Agriculture is the foundation of the national economy, and the guarantee of national industry. Greenhouse can grow counter-season production of crops and bring higher profits to farmers. But in our country the informatization level of agricultural is low. By using data acquisition technology, wireless communication technique and computer technology, this project can make intelligent monitoring, management and control of the large-scale plastic greenhouse come true and make agricultural information access and remote data transmission and exchange automated. The project is of simple circuit, low cost, good maintainability, and the expected results (the management of the greenhouse control) is operating conveniently and hommization, which can reduce a lot of manual work. It is expected to be widely popularized in agricultural plastic greenhouses in China. Key words: Intelligent Agriculture; Automation; Data acquisition; Sensors;

Abstract: Inspired by the astonishing ability of the fish, more and more researchers devote themselves to improving the performance of the underwater robotic propeller. In this paper, a novel design and a preliminary performance study of a lightweight robofish are presented. Firstly, the principle of the actuator by magnetomotive force is introduced. Secondly, the implementation of the biomimetic robofish is investigated. Finally, several expriments are conducted to explore the energy consumption of the magnetomoive force actuator and the affection of the kinematic parameters on the velocity. The experimental results reveal that the novel biomimetic robofish driven by magnetomotive force has a low energy consumption and shows good performance in swimming.

Abstract: In this paper, fuzzy control was applied in the technology of reducing NOx of vehicle exhaust. The calculation model of control system was obtained through theoretical derivation. The input and the output of the control system were obtained through bench test, and then established the control system table. Fulfilled the hardware installation and debugging of SCR system, DSPACE system, NOx sensor and engine system, and then the control system look-up table was be written in DSPACE /MATLAB system. It is proved that the application of fuzzy control in vehicle emission reduction is feasible through the processing and analysis of test data.

Abstract: A research of fuzzy RBF approach method based on IMGA is proposed, depending on the equivalency between RBF network and fuzzy inference, a fuzzy RBF network is designed. At the same time, the parameters and weights of the fuzzy RBF are optimized based on the immune memory genetic algorithm (IMGA), and the speed of convergence is accelerated. The optimized system is simulated by MATLAB, and compared with the original system, the approach effect of the fuzzy RBF is improved by IMGA.

Abstract: An novel methodology to solve the attitude control and momentum management problem of the space station with model uncertainties is developed. By the use of the robust output regulation theory, the attitude control and momentum management integrating model and the internal model of disturbances are combined to design a robust coupling controller such that the plant outputs track desired reference signals and the model uncertainties can be tolerated. It is proved that the designed controller guarantees stability of the closed-loop system and suppresses the disturbance well. Simulation results are provided to demonstrate the feasibility of the proposed method.

Abstract: The focus of this paper is uncertainty modeling and controller designing of air-breathing hypersonic vehicle. First, the hypersonic vehicle longitudinal dynamics model is made on the base of the fitting of aerodynamic parameters. As to the uncertainty of model parameters, a linear model of the uncertain part is established and the LQR controller parameters are thereupon designed with state transition and a first-order Taylor series expansion method, based on feedback linearization of the system. The simulation results that the hypersonic flight control system stated in this paper can well realize the tracking of speed and trajectory angle input command under the situation of floating model parameters.

Abstract: The paper deals with speed control system design for variable speed fixed-pitch (VS-FP) wind turbine based on improved internal model control. The design procedure includes two steps: first nominal controller is considered that the VS-PF wind turbine works well around its operating point; second, a stable compensator is designed to reject the influence of external disturbance on the control performance when external disturbance occurs. Finally, a numerical simulation is presented to illustrate the efficiency of the proposed method.