Applied Mechanics and Materials Vols. 347-350

Abstract: The dual-excited electromagnetic flowmeter with arc-electrodes in the paper can measures liquid level and flow velocity. A pair of electrodes is set as signal injection electrodes on the pipe bottom. AC signal injected used to determine liquid level. The theoretical analysis and experiment results indicate that it is feasible for partially filled pipes.

Abstract: the design of vessel centralized water supply system which can use diesel exhaust heat and solar energy hybrid, the system is better than the traditional water supply system and it can make full use of waste heat and solar energy,so the design will save the energy and protect environment .PLC centralized control system can realize the purpose of energy saving and intelligent control.

Abstract: A new type of three-legged robot design scheme is proposed and the movement control of it is studied in this paper. Spatial crank rocker mechanism (RSSR) is used to will the motor rotation into a leg swinging in mechanical design. Advanced reduced instruction-set computer machines (ARM) chip, wireless communication module and magnetic encoder are used in controller design. Proportional and differential (PD) closed loop control arithmetic is used to realize the control of the robot. The robot realizes the movement of straight walk, curve walk, turning in situ, jumping and so on. It has a broad application prospect.

Abstract: The stability analysis and controller design of discrete linear systems with time-varying delay are addressed. Firstly, the uniformly asymptotical stability criterion with adjustable parameter is derived by Lyapunov-Razumikhin approach. Then, the stabilization approaches for linear systems with time delay by state feedback and observer based-on state feedback are also presented. Sufficient conditions for the existence of state feedback gain and the observer gain are derived through the numerical solution of a set of obtained linear matrix inequalities. Compared with methods in the references, the dynamic performance of systems, such as the overshoot and the convergence rate of the response, can be adjusted by changing the adjustable parameter. Lastly, an illustrative example is given to show the effectiveness of the proposed.

Abstract: In the past years, the routing problems of wireless sensor network (WSN) have attracted great interest, and many routing protocols for WSN have being proposed. However, these routing protocols pay little attention to the transmission reliability. Therefore, this paper proposes a new multipath ring routing algorithm for WSNs. The proposed algorithm utilizes ring level to separate sensor nodes into several sections, which can improve the reliability of the data transmission. Using the multipath ring routing data delivery improves as an average of 27.58% to leach routing and 113.06% to directing routing.

Abstract: The weak signal, which is usually submerged in strong noise, is very difficult to detecte for its amplitude and frequency. The dynamic properties of VanderPol-Duffing are studied in this paper. Such system can go into the chaos under certain parameters. In chaotic state the disturbance of weak periodic signals can make the system dynamic behavior change dramatically. Our research results show that the system is from period doubling state to chaotic state when the amplitude of input signal is changed. And it has a remarkable impact influence on the system dynamic performance when the input frequency is varied. The unknown frequency can be detected through counting the numbers of turning point in phase diagram. The simulation results verified that the presented method is feasible and there are a lot of theory values in the research.

Abstract: An miniature underwater robotic system for hazardous environment has been developed. The system consists of an underwater robot, a robot control station and a cameral control station. The underwater robot is installed two cameras for inspection, one is a camera of radiation resistant with two-freedom PTZ in the front of the robot, and the other is a fixed camera in the back of the robot. A miniature manipulator is equipped under the fore-camera to catch the small parts like bolts and nuts in the pools. The movement of the underwater robot is controlled by the master control station and the cameral control station controls the rotation and focus of the fore-camera. Besides, the underwater robot is equipped with the sensors, as MEMS inertial measurement unit, magnetometers, side scan sonar, water-depth gauges, which are integrated to determine the orientation and location of the robot. Meanwhile the navigation information is displayed in the virtual environment, which is modeled upon the real pools of the nuclear power plant. The underwater robotic system is easy to operate and will be applied to the hazardous environment like nuclear environment in future.

Abstract: Networking of city tunnel monitoring systems is an application instance of Internet of Things. Situation awareness of city tunnel traffic is a method of analyzing the traffic safety of city tunnel. This paper studies the ontology model for monitoring tunnel traffic situation. The model reflects the basic concepts and semantic meanings of an integrated traffic network. The situation of the integrated traffic network can be described in standard formats. The use and management of the integrated traffic network is improved. Therefore this model can improve the effectiveness and efficiency of intelligent transportation service.

Abstract: Existing redundancy control algorithms in WSN often have some evident shortcomings such as hypothesis is too much, application backgrounds are not clear, the precision of redundancy control is low and computing complexity is high. In this paper a probabilistic based redundancy control algorithm (PBRCA) is proposed. Aiming at specific application scenarios, PBRCA introduces the probabilistic estimation theory, taking uncertainty in reasonable range as cost to determine redundant nodes in network and allow as many redundant nodes as possible to sleep. This algorithm requires fewer assumed conditions and less computational complexity as well as high flexibility. In addition, it can adapt to various redundancy control requirements of WSN with different network scales and node densities. Simulation results show that, PBRCA can control network topology node redundancy effectively with little cost and improve network efficiency.

Abstract: In this paper, an on-chip clock (OCC) controller with bypass function based on an internal phase locked loop (PLL) is designed to test the faults in system on chip (SOC), such as the transition-delay faults and the stuck-at faults. A clock chain logic which can eliminate the metastable state is realized to generate an enable signal for the OCC controller, and then, the test pattern is generated by the automatic test pattern generation (ATPG) tools. Next, the scan test pattern is simulated by the Synopsys tool and the correctness of the design is verified. The result shows that the design of at-speed scan test in this paper is high efficient for detecting the timing-related defects. Finally, the 89.29 percent transition-delay fault coverage and the 94.50 percent stuck-at fault coverage are achieved, and it is successfully applied to an integrated circuit design.