Applied Mechanics and Materials Vols. 475-476

Abstract: Localization of sensors is one key technique in wireless sensor networks (WSN).Because the midnormal-based localization algorithm (MBLA) has shortcomings such as low accuracy, relatively large number of iterations, a localization algorithm based on permutation and combination midnormal (PACMLA) for WSN is proposed. Nodes are divided into anchor nodes and unknown nodes. In its own communication range, unknown node can communicate with anchor nodes. In PACMLA algorithm, the unknown node communicates with the anchor nodes in turn, and collects their coordinate information and RSSI value. Then by comparing the RSSI values received by unknown node, these RSSI values are formed an array in accordance with the order from small to large. Then starting from the first value of the RSSI array, each of these values and the value behind them will be combined into data sets. Finally, according to corresponding coordinate information of the RSSI value in the data sets, we will determine the position of the unknown node by Point In Which Side (PIWS) determination. In addition, our algorithm is a kind of Range-free algorithm, and it can cuts down the node energy cost. The experiment results illustrate that the PACMLA algorithm has lower error and higher accuracy.

Abstract: The existing clustering protocols exists shortages that the nodes with small residual energy may be choose as cluster nodes, which communicate directly with sink causes more energy consumption. Member nodes transmit data directly to cluster head also caused more energy consumption. A reliable energy efficient wireless sensor network hierarchical routing algorithm (REHRA) is proposed to further improve energy efficiency. It introduces residual energy factor for election of heads that makes nodes with more residual energy priority become heads. The data transmission for heads to sink uses flooding algorithm that ensures reliability. Routing tree is formed within local cluster and data delivers from leaf nodes to the cluster head. Performance analysis and simulation experiment shows that the new algorithm provides higher energy efficiency and longer lifetime.

Abstract: A new measurement apparatus was developed to characterize the dynamic liquid moisture transfer properties of textile materials such as textile fabrics, based on the mechanical equipment, microelectronics, sensors and control system. Derived from the test data, five indices were defined to characterize the dynamic liquid moisture transfer difference between two surfaces of textile fabrics. The test principle and the evaluation method for the dynamic moisture transfer difference between two surfaces of textile fabrics were introduced. Six types of fabrics made from different textile materials were measured. The one-way ANOVA analysis was carried out to identify the significance of the differences of the indices among the test fabrics. The results show that each evaluation index is significantly different (P<0.05) among different test fabrics, and fabric 3 has a better liquid moisture transfer from inner surface to outer surface with the highest value of moisture transfer difference.

Abstract: The node localization is one of the key technologies in wireless sensor networks. To the accurate positioning of the nodes as the premise and foundation, this paper presents a centroid localization algorithm based on Cellular network. First, the anchor nodes are distributed in a regular hexagonal cellular network. Unknown nodes collect the RSSI of the unknown nodes nearby, then select the anchor nodes whose RSSI is above the threshold. Finally, the average of these anchor nodes coordinates is the positioning results. MATLAB simulation results show that localization algorithm is simple and effective, it applies to the need for hardware is relatively low.

Abstract: Based on the nonlinear control strategy of beam halo - chaos, this paper studies the sinc function control method of beam halo - chaos in uniform focusing magnetic channel. And we use Poincare section technology to simulate the beam envelope oscillations and single-particle trajectories. The results show that the use of this method can effectively eliminate beam halo and its regeneration, so that we can achieve effective control on beam halo - chaos.

Abstract: A control system for multimedia classroom is designed based on Mitsubishi PLC. The specific hardware design and software design are also given. The control system functions are as follows: The manual control of classroom doors, or automatic control by the detection signals of microwave radar sensors; The manual control of lights, or automatic control by the detection signals of the Human pyroelectric sensors and light switch type sensors; The manual control of the air-conditions, or automatic control by the detection signals of the temperature sensors; The control of the projector and screen; Intelligent fault detection and alarm. In addition, the touch screen is used as man-machine interface, which have the advantages of convenient operation and maintenance, also the generous beauty. Through simulation experiment, the control system can achieve all of the above control functions stably and reliably.

Abstract: The self-healing control problems attract many concerns of researchers who major in power distribution network. This paper proposes a novel self-control method for a class of power distributed network with uncertainties. The fuzzy set idea is introduced to solve the uncertainties considered here. The efficiency of the proposed method is demonstrated by simulation results.

Abstract: In fuzzy system, the selection of fuzzy rules is difficult. For the whole system, the merits of the rules seriously influence the final result. This paper uses the ant colony algorithm (ACA) to optimize the weights of the rules in the standard additive fuzzy system. At present, the ship dynamic positioning system has caused wide public concern. In the paper, a ship dynamic positioning controller based on the ACA and the standard additive model is proposed. Through the new controller is applied to control the dynamic positioning ship in the complex sea conditions, the results show that the proposed controller is effective.

Abstract: For an electric vehicle, during pedal tip in/out, driveline torsional resonance frequency can be excited by a quick motor torque response. As a result, noticeable oscillations can occur in the vehicle acceleration without adequate controls, which can cause discomfort for passengers. This paper proposes robust controllers to damp driveline oscillations during pedal tip in/out for an electric vehicle. Based on control-oriented system models that take account of various parameter uncertainties and unmodeled dynamics, robust controllers were designed by using the mu synthesis method. The results of the simulation demonstrate the effectiveness of the proposed control algorithms.

Abstract: This paper addresses the observability problem of 2D Multiple Autonomous Underwater Vehicles (MAUVs) cooperative navigation system. We derive the conditions to keep the local weak observability of navigation system using the Lie derivatives, and characterize the unobservable trajectories of AUVs. We design a series of simulation experiments using the Extended Kalman Filter (EKF) to verify the theoretical results. Finally, the simulation results show that the good performance of navigation system can be presented if avoiding the unobservable trajectories of AUVs.