Advanced Materials Research Vols. 875-877

Abstract: Modeling and simulation of generator, frequency converter, motor, propeller of integrated power system in PSCAD environment respectively, finally form a complete system, which contains the diesel engine and speed regulation system, generator and excitation system, motor and vector control system. Establish the propeller model as motor load by Fortran language. The motor load constantly changing, traditional PI controller parameters are not easily adjusted in real time, SNAPID controller based on the error changes in the changing, complete SNAPID controller in MATLAB environment and call MATLAB continually, the control effect of speed is improved in the process of marine propulsion. Finally simulate typical working condition of system, the simulation results show that propeller shaft torque is smaller when grading operating, the influence of electric propulsion system is smaller and conducive to maintaining the stability of the system.

Abstract: Wind turbine power performance testing consists of power, temperature, air pressure and wind speed measurements collected for this study during which measuring uncertainties are involved. Due to the measurement uncertainties, the results of power performance testing are affected; therefore, it is necessary to consider the measurement uncertainties for evaluating the accuracy of turbine testing. For this purpose of this study, uncertainty analysis for one 5kW wind turbine power performance testing was conducted. The results of uncertainty analysis indicated that the uncertainty negatively affected the validity of conclusions drawn from power performance testing, and the uncertainty sources are various in different wind speed bins.

Abstract: In this paper, a custom-made energy management system based on embedded system with a touch panel/LCD/FPGA and microprocessor is implemented, it not only solve the problem of energy waste, control scattered energy supply and saving, but also generate a user-friendly control platform. The life of the proposed system is also longer than an EMS with personal computer. In the proposed embedded EMS, a simulation of FPGA is firstly designed and processed with the control circuit of touch panel, RENESASs micro-processor, and communication panels of ZIGBEE and CAN BUS to constitute the system hardware. Analysis and allocation of energy is then done to complete the software design. Finally, experimental results are used to verify the feasibility and reliability of the proposed EMS.

Abstract: Architecture is the one that must satisfy the needs of human activities and therefore depends on the day/night cycle in the process of building designing, in the functional distribution and also in the way the image is perceived by people, in different moments of the day. This is where the concern for intensity and light type appears when designing a building. Light features, heat, air circulation represent key words in assessing the energy consumption of a building. When these features are correctly manipulated and controlled, they will diminish the consumptions made by used inside artificial lighting systems and will lead to the growth of energetic efficiency and thermal comfort. Thus, the architect should know all possibilities, usage and imaginary methods for materials, as well as the effects one can expect when applying and exploiting natural and artificial light. Sustainable development means minimizing environment costs and maximizing economic profit, so that satisfaction of the present needs can be possible without compromising the possibility for future generations to satisfy their own needs.

Abstract: In recent years, modeling and control of flexible space robots are extensively researched. Compared with traditional rigid robots, flexible robots have low energy consumption, wide operating space, high carrying capacity and other characteristics. However, due to its special structure, the robot arm will get deformation and vibration in motion, which brings a lot of problems to the positioning and tracking control of flexible space robots. Therefore, directing at the dynamics modeling and control issues of the free-floating flexible dual-arm space robots, this article carries out in-depth study. This paper first studies the elastic deformation and vibration of the flexible space manipulator and the robust control problem of the system trajectory tracking for free-floating flexible dual-arm space robots.

Abstract: The set-up time in robotic welding needs to be reduced so that it can be used for limited production runs. One challenge in achieving this reduction is the automatic localisation of the weld seam. A method is developed in this paper to locate the weld seams by human-machine interface. In particular, this method uses an RGB-Depth sensor, such as the Microsoft XBOX Kinect sensor, to identify a human hand that is pointing at the weld seam. A ‘hybrid hand detector’ is developed to recognise the human hand and fingers using both the depth and colour information. In turn it enables the identification of the weld seam. Experimental results shown that the weld seam can be reliably identified using the proposed method at near real time speeds.

Abstract: With rapid development of the geographic information system technique, the electronic chart has come into being and is more and more mature. The electronic chart can provide the accurate and detailed information about the ocean environment, including the depth of water, situation of the seabed, distance from the shore, position, orientation and velocity of the ship, and other useful information. This paper first gives some introduction about the electronic chart. After analyzing the characteristics of the electronic chart, the application of the electronic chart in ocean navigation is provided. Finally the existing problem of the electronic chart and its future development trend are also discussed.

Abstract: Considering backlash, radial clearance of bearing and time-varying mesh stiffness, nonlinear dynamic model of gear bearing rotor system is established considering unbalance and loosening fault. Nonlinear dynamic equations are solved using Runge-Kutta method and Newton-Raphson method. Numerical simulations of the dynamic equations and the affection of the depth of crack and length of wear to the nonlinear dynamic behavior are studied. The results shows that tooth off, bilateral impact phenomenon are occurred, with increasing gear failure when unbalance occurs, and the gear system exhibits a diverse range of periodic, quasi-periodic and chaotic motion. When loosening fault occurs, the range of chaos motion is increased, and gear burnishing is also intensified.

Abstract: Speckle noise is a common phenomenon in Optical Coherence Tomography (OCT) images. This paper describes a dynamic filtering approach for anterior chamber OCT images to reduce the speckle noise in wavelet domain. The approach proposed segments the OCT image into some parts and identifies if the parts have region of interest (ROI), which includes the anterior chamber tissues. Then, it suppresses noise with three different suppression strategies in part with ROI. For the part without ROI, it sets the discrete wavelet transform coefficients of this part to zero. Here, the sampling-based sub-band adaptive algorithm is used to distinguish the ROI; and the correlations of neighboring wavelet coefficients and the coefficients of the corresponding locations in adjacent decomposition levels are used to suppress the noise. The performance improvement over the previously published method is quantified in terms of noise suppression, image structural preservation and visual quality. The numerical values of the image quality metrics along with the qualitative analysis results indicated that the approach proposed has better performance.

Abstract: A set of dynamic field tests were conducted on the Chulitna River Bridge recently. The Chulitna River Bridge, built in 1970, is located at Historic Mile Post 133 on the Parks Highway between Fairbanks and Anchorage, Alaska. Ambient free-decay response approach is used to estimate the dynamic properties of the bridge. Stationary and dynamic tests on the acceleration responses of the bridge recorded at different locations and in different directions during traveling vehicle passing the bridge. The natural frequencies are identified are characterized by the FFT methods. Results show that there are several components at 1.50, 2.20, 2.85, 3.23, 4.58 Hz are characterized, 2.85, 3.23, 4.58 Hz are bridge vertical mode; 1.50, 2.20 Hz are the longitudinal mode of bridge. Compared with the finite element model results, the measured results matched very well. The modal parameters identified from the bridge responses recorded at different locations are compared with each other to check their consistency, and are compared with FEM analytical results. The results demonstrated that (1) the modal parameters consistent with the FEM results; (2) The modal frequencies results are very sensitive to measurement locations, as such, multiple measurement points are necessary, and the optimization of measurement location is critical to conduct the test efficiently; (3). The identified modal properties of the Chulitna River Bridge could be used as benchmark in on-going health monitoring studies of this bridge.