Advanced Materials Research Vols. 798-799

Abstract: Studying on adaptive active noise control (AANC) system of the truck interior cab to reduce the low-frequency noise,a normalization FLMS algorithm simulink model is established in Matlab/Simulink.Then taking it as the core,a feedforward adaptive active control system and a feedback adaptive active control system of the tuck interior cab are established in Matlab/Simulink .Considerating the actual error channels effects on systems ,the noise reduction effects of two adaptive active control systems are verified from the simulintion results.Through comparing the two wo adaptive active control systems,we found that the feedforward adaptive active control system is more stable.

Abstract: This article considers the problem of trajectory tracking control for a micro fixed-wing unmanned air vehicle (UAV). With Bank-to-Turn (BTT) method to manage lateral deviation control of UAV, this paper discusses the outer loop guidance system, which separates the vehicle guidance problems into lateral control loop and longitudinal control loop. Based on the kinematic model of the coordinated turning of UAV, the aircraft can track a pre-specified flight path with desired error range. Flight test results on a fixed-wing UAV have indicated that the trajectory tracking control law is quite effective.

Abstract: Alternating current field Measurement is one of the important progresses about electromagnetic nondestructive testing in recent years. Alternating magnetic fields excitation testing model is established by using electromagnetic simulation software ANSOFT, a flat plate crack defects are simulated. By analyzing its principle, crack depth and the width change influence on test results, finally the simulation results are verified by the method of experiment. The experimental results are consistent with the simulation results. The results show that this differential probe has good effect on crack defects test.

Abstract: This paper mainly conducts multi-attribute evaluation for the deployment of air defense programs through TOPSIS method, quantifies multiple indices whose attributes are interval numbers in the deployment of air defense programs, and verifies the theory in four groups of experimental data. Compared with the actual situation, the proposed method is proved to be feasible.

Abstract: Hierarchical mobile IPv6 fastens the binding update process of micro mobile handoff and reduces handoff delay. A large number of binding updates and registrations increase signaling load and lengthen handoff delay. For this reason, it is proposed to apply tunneling mechanism to hierarchical mobile IPv6 optimization scheme (T-HMIPv6) to obtain care-of address in advance based on handoff information, conduct duplicate address detection, and complete local binding update while building a tunnel. Simulation experiments show that compared with hierarchical mobile IPv6, this scheme can greatly reduce handoff delay and packet loss rate and effectively improve mobile node's macro handoff performance.

Abstract: The Articulated Arm Coordinate Measuring Machine (AACMM) is a new type of non-orthogonal system precision instrument with the advantages of large measuring range, small volume, low weight and portability. To improve the measurement accuracy of AACMMs, an error analysis and calibration method for AACMMs is proposed. The kinematic model of the AACMM was established with D-H model, and then the error model of the AACMM was established on the basis of kinematic model with total differential transforming method and the singular value decomposition of Jacobian matrix and the decomposition of orthogonal matrix elementary row transform. Finally, the error model was validated by position error residual calculation. The error model provides a theoretical foundation for calibration and compensation of the AACMM.

Abstract: We present an ontology-based device description model which abstracts the general information of device in smart home. And we use XML to describe the device model which could be understood by machine. The device model is not restricted by software platform and easy to be reused.

Abstract: By the mountain landslide generated conditions of the analysis, the paper proposes to build the monitoring area of the mountain wireless sensor monitoring network, real-time monitoring of the mountain landslide natural disasters, monitored data, real-time transfer to the same installed in the monitoring area collection terminal equipment, acquisition terminal will get the signal carried digitizing, wireless transmission device, the data transmitter back to the data management center, data management center real-time data capture carry out treatment, landslides of analysis, assessment and early warning, can greatly improve the early warning capability to avoid the loss of personnel and property.

Abstract: This paper represents an engineering method to develop a desktop-based interactive virtual maintenance training system, which could configure scenarios dynamically. The interactions of maintenance training scenarios are constructed by hierarchical Petri net. The maintenance knowledge and procedures of assembly/disassembly in virtual environment are presented by using high level Petri net. Each maintenance task is decomposed into a set of sequential basic action element done through left/right hand or both hands. The Petri net presentation of coordination and execution of each task helps to configure scenarios dynamically. This method is conducive to the interactive representation of task and action scenarios in the virtual maintenance training system.

Abstract: The new method used the node to make up the keyword management tree. The keyword management tree was optimized with renewing the group keyword. In the meanwhile, the use of father nodes and the processing batch method improved the keyword renewing efficiency. The analysis result of theory shows that the method is a high efficiency and extendible group keyword management method which used in the heterogeneous wireless sensor network.