Applied Mechanics and Materials Vols. 457-458

Abstract: To visualize the conditionson the sea bed. People created the robot which could move under water. Theunderwater robot control system usually consists of the host computer,interactive interface and lower machine. This paper mainly designed underwaterrobots interactive interface based on QT software in VC++ developmentenvironment, exploiting the distance measurement principle of ultrasonic andcollect information . Underwater robot feedback information mainly includescurrent velocity, distance between the front obstacle and a travelinglocus. Important ocean environmentparameter will be represented visually by analyzing forming three-dimensionalchart after the simulation by MATLAB, even the environmental factor ofSeafloor.

Abstract: Real-time image acquisition and processing system is widely used. In order to realize the fast development of the relative project, an image acquisition and processing platform is presented. In the design, the DSP of TMS320C6416 is used as high-speed signal processor core, and the FPGA of XC3S700 is taken to offer embedded memory, and connecting DSP and CMOS image sensor. To reduce the burden of CPU, the EDMA technology is used to finish the image data transmission. The main function modules of the platform include acquisition, processing, USB communication, and VGA displaying. The platform can acquire image, display image and make some image processing operations such as geometry transform, orthographic transform, features extracting, target recognition and target tracking. Experiment results show that design of the image acquisition and processing system is reasonable, feasible and has some application value.

Abstract: Stepper motors are wildly used in the many fields, such as CNC machine, motion robot, aeronautics and astronautics. To realize online precise measurement, error analysis and verification of control strategy, it is necessary to sample and analyze the driving signals of motors, and simulate mechanical motion in a computer. So a test, analysis and simulation system of stepper controllers was designed. Driving signals of stepper motors are synchronously sampled and analyzed by the unit of acquisition and analysis. A connecting Motherboard was used to link the various parts and finish the data transmission. The working states of motor divers under load were simulated by connecting motor driver to the simulation board of motor load. In the industrial computer, the control effects of multi-axis control system were displayed by 3D simulation. Test results show that the system is stable and reliable, and has a certain application value.

Abstract: One of the important causes of traffic accidents is driver fatigue. In this paper, a new real-time non-intrusive method to detect driver fatigue is proposed. Firstly, face region is detected by AdaBoost algorithm because of its robustness. Then a region of interest of the eye is defined based on face geometry. In this region, eye pupil is precisely located by radial symmetry transform. With principal component analysis (PCA), three eigen spaces are trained to recognize eye states. Open, closed eye samples and other non-eye samples in the face region are used to get these eigen spaces. At last, PERCLOS and consecutive eye closure time are adopted to detect driver fatigue. Experiments with thirty two participants in realistic driving condition show the reliability and the robustness of our system.

Abstract: In view of the present high hardware and communications problems of slope deformation monitoring, design a set based on wireless sensor network (WSN) of the slope deformation monitoring system.The system sets up a platform for wireless sensor network through the TI chip CC2530 and free ZigBee protocol,including the sensor node,the router nodes,the coordinator node,and the use of Kingview realizes the monitoring configuration data of slope deep displacement and ground water.By testing,the system can effectively realize the monitoring of the slope data,reduces the cost of the slope deformation monitoring.

Abstract: There exists a contradiction between catching time and catching valve for carrier wave catching to micro-dynamic signal in USB/UCB. So a new arithmetic of long point Base 4 FFT has been designed and emulated.

Abstract: Data aggregation technique is widely used for its advantages in reducing data throughput and avoiding collision. Meanwhile, it also introduces some additional security concerns. So it is meaningful to research secure data aggregation. We firstly introduced the related concepts and key technologies of WSNs secure data aggregation. Then an effective data aggregation algorithm (EDAA) is proposed after the SMART algorithm is analyzed. The algorithm is simulated in NS2 software, and the result shows that the data aggregation algorithm EDAA can effectively reduce the transmission costs and the energy consumption of nodes

Abstract: Health monitoring of the bridge structure has gradually become one of the hot topics. The signal decomposition technology is the key technique of the bridge structural health monitoring. The traditional data analysis and processing methods, which can only be applied to stationary or linear signal processing, have significant limitations. However, the structural response signals tested are mostly non-stationary and nonlinear. So methods that can effectively analyze non-stationary and nonlinear signal are urgently needed. Based on the summarization and analysis of the shortage of wavelet analysis method, the application of local wave method for data processing and analysis in structural health monitoring is put forward. The feasibility and superiority of local wave method is discussed. Experimental simulation results show that the application of local wave method in bridge health monitoring signal decomposition is feasible.

Abstract: Chance measure is a non-additive measure. In this paper, we derive the truncation method for chance measure. This result is a natural extension of the classical truncation method to the case where the measure tool is non-additive. The properties of chance measure are further discussed. Then the truncation method will be given on chance space. This work generalizes the research and applications of the truncation method.

Abstract: The method for setting the boundary condition of the pool surface was studied. Using the FLUENT 6.3 CFD software,the RNG k-ε turbulence model and SI MPLE algorithm,the sewage treatment pool where a submersible mixer with two leaves was numerically simulated by describing the surface as wall,VOF model and rigid-lid assumption respectively. Meanwhile, the velocity distribution in the pool was analyzed. The results showed that: the contribution of the three different treatments to the flow in the pool are small except the area near the pool surface. In the first case ( describe the surface as wall), pool surface fluid velocity is zero, which is inconsistent with the actual situation obviously. In the other two cases (describe the surface as VOF model and rigid-lid assumption), the pool surface fluid velocity has the same velocity and is not zero,which is consistent with the actual situation. In the case of rigid-lid assumption,convergence was reached easily,and it is undemanding for the computer configuration,so it ( rigid-lid assumption) is the best boundary conditions setting method for the surface and provides guidance for the mixer numerical simulation.