Applied Mechanics and Materials Vol. 681

Abstract: The structural health monitoring technology has been one of the most important issues. In this paper, the design of wireless sensor network for structural health monitoring application is studied. The basic concept, significance, state of the art of structural health monitoring, the architecture and the principle of the wireless structural health monitoring system are described. The hardware and software of the overall system are designed and built. The WLANonSAN architecture network is particularly proposed as a solution for the large-scale networks.

Abstract: In case of existing localization system, it usually depends on video information by camera. Therefore, the camera has to be operated 24 hours a day. For the special region of interest, position recognition is available, however, for the most cases, once the camera is out of observed extent, the position recognition is not available. In order to back up these disadvantages, the Wireless Sensor Network, by using GPS and various sensors, can detect and monitoring the data up to the area which the image information cannot detect. For this, the thesis suggests the efficient monitoring system using GPS and human body detecting sensor.

Abstract: This paper presents an unsupervised structure damage classification method based on the AiNet immune network clustering for the large-scale structure. The AiNet clustering is employed to update memory cell sets and get the clustering center. The memory cell sets are used to classify measured data. The algorithm is tested using a Benchmark structure. The test results show the feasibility of using this algorithm for the unsupervised structure damage classification.

Abstract: The infrared theodolite is unable to realize the practical problems of star school, put forward a set of indirect detection method for measuring accuracy of photoelectric theodolite, This method not only solves the infrared theodolite test precision,but also can be convenient for full visual field and a full range of accuracy evaluation of equipment.

Abstract: In this paper, we propose a seismic wave detection process using a laser interferometer as a seismometer. The laser interferometer system is an important equipment with its remarkable accurate capability for displacement measurement. During the process of the seismic wave measurement, however, environmental and nonlinearity error are occurred in a heterodyne laser interferometer. Through the extended Kalman filter compensation, the distortion is reduced. With a recursive STA/LTA algorithm, the PS-time of the seismic wave is determined and then the epicenter distance can be derived. Through some simulations, it is demonstrated that the proposed algorithm can reduce error factors and improve the measurement accuracy of a seismometer.

Abstract: In this paper, with the development of Information technology, application service between IT and traditional industry has been on the rise. And there are many on-going discussions actively regarding the Air quality system based on wireless sensor network which monitors and control the industrial environment automatically and manually with the application service of detecting harmful gas. In this thesis, operation program constitute the administrator monitoring device, which collects data from sensor node of wireless sensor network and sensor node and transmits environment information to display and server. Also for remote monitoring, user operation program constitutes based on PC/Smartphone Under this, the harmful gas which is made in daily life is measured. Real time monitoring system based on wireless sensor network is designed and realized.

Abstract: For complex spacecraft assembly conditions, how to play effective and flexible robotic characteristics, and improve production efficiency, is the problem needed to solve.this paper presents a flexible force control method on robotic assembly: a 6-axis force/torque sensor is mounted between tools and the end of robots, the operator operates the load by hands directly, and the system can obtain the force/torque information caused by operator’s hands through gravity compensation algorithm, then the force/torque information is used as input parameters to control the robots moving with the hands. The detailed scheme and algorithms are presented in this paper.

Abstract: To reduce launching load of rocket and power consumption of rover, design of sampling manipulator was proposed which was lightweight, low-power consumption and multifunctional. Stability principle of triangle was used to comprise stable structure between robotic arm and locking device. And the weight of planetary rover was effectively reduced and its energy efficiency was greatly improved by combining manipulator and mast lifting stereo camera into one. Forward and inverse formulas were built by using D-H method and Robotics Toolbox was used for kinematics simulation. The simulation results indicate that the design of samping manipulator is reasonal which meets the purposes of lightweight and low power consumption.

Abstract: A novel design method for modal space controller with dynamic pressure feedback is proposed for hydraulically-driven Stewart platforms. By exploiting properties of the joint-space inverse mass matrix, an analytic modal matrix is derived which can be used for transforming the highly coupled multiple-input multiple-output (MIMO) dynamics into six independent single-input single-output (SISO) channels in modal space. Based on classical control method, the modal space controller with dynamic pressure feedback is implemented and used to broaden the bandwidth of each channel in modal space separately. The effectiveness of the proposed method is examined through experiment.

Abstract: Generally, robots are a class of technical systems which imitate or substitute driver or human intellectual functions. This is achieved by the combination of various types of handling equipment or locomotors system, causing the anthropomorphic robot character, the different types of computer equipment, or logical, which determines the intellectual functions thereof. The robots operate in a specific environment, the characteristics of which may remain constant or variable over time. While battery technology is of great interest for mobile robots, but it is not reliable in the time, there are several strategies for the storage of energy (fuel cells and the micro-fuel cell), as well as strategies for harvesting energy from the environment in various ways and energy management using sophisticated control techniques to improve power supply costs. One of these strategies is to use solar energy to power mobile robots. The solar cells appearance is due to the need to supply power spacecraft since not require maintenance for a period of time.