Applied Mechanics and Materials Vols. 385-386

Abstract: This paper works on extended Kalman filter (EKF) for model-based fault detection of an electro-hydraulic system to deal with stochastic behaviour during control. A mathematical model of an electro-hydraulic system is developed. Some faults are introduced to evaluate the EKF fault detection method. Comparison of the EKF estimation accuracy and a linearised model-based accuracy shows the advantage of the EKF.

Abstract: This paper probes into the design of the remote wireless monitoring system for wind turbine, based on STC89C54RD+ microprocessor. TC35 produced by Siemens is used to send and receive information. Through this we can obtain the Real-time information of the temperature and vibration of the wind turbines.

Abstract: The circuit board fault detection based on infrared technology is a new non-contact and non-destructive method. During studying the system structure of circuit board fault infrared detection, the author analyzes the key influence factors of infrared information extraction, gives a new fault diagnosis method of infrared image processing and pattern recognition, then points out the problems in the practical application of fault detection instrument, provides the reference for the further study of the technology.

Abstract: Due to the influence of interference signals, such as the electromagnetic interference, noise interference, temperature drift, and so on. The traditionally used metal detectors have the shortcomings of the inaccuracy and poor anti-interference ability. This paper is based on analyzing the principles and characteristics of traditionally used metal detectors, presents a new full digital beneficiation metal detector, which using MSP430 MCU as the core, the FFT algorithm is employed successfully to analyze the induction signals that collected when the metal through the induction coil, gets the amplitude-frequency and phase frequency characteristics, determines whether metal impurities through the coil by the characteristics of cross-correlation function. In the end, achieves good harmonization between sensibility and reliability.

Abstract: In the current mine ventilators monitoring system, there are some difficulties in the installation and maintenance because of the wired connection. To solve the problem, this paper introduces a new ventilators monitoring system based on ZigBee in which the monitoring parameters are transmitted wirelessly. The collecting devices are designed to form a cluster network to collect temperature, vibration, air pressure and other parameters of the mine ventilator. All these devices are battery-powered. Besides, the monitoring software in PC is developed using MFC. Experiments show that the designed wireless sensor network works well in the site environmental condition and the system is very convenient to install since the wireless connection. This monitoring system will have a wide application prospect in the upgrade of the old monitoring system of the ventilators.

Abstract: Assessing displacement fields of coronary arterial skeletons from a pair of nearly orthogonal cineangiographic image sequences is addressed. Projections of vessel skeletons are firstly extracted from each frame. Then, 2D displacement vectors of vessel skeletons during each temporal interval are estimated along the image sequences. 3D displacement vectors of each skeleton point are finally reconstructed along the overall sequences. Possible errors are discussed. Experimental results with clinically acquired in vivo image data have demonstrated the validity of the method.

Abstract: Based on the diffraction theory of the one-dimensional gratings at oblique incidence, by introducing the laser autocollimation system, a novel approach of dynamically measuring small angles with three degrees of freedom is proposed. By matrix transform, a mathematical model is established to describe the changes of small 3D angles as a function of the variation of the image position of the diffraction spot, and the solution of this model is demonstrated. A prototype machine has been made to verify the practicability of the measuring method proposed. Analysis of the measuring range and resolution of the system shows that within the range of ±1.6 degrees.

Abstract: Three-dimensional modeling of the image acquisition system based on binocular computer vision scanning system scene with MCU processing the two-dimensional image data collected by the CCD sensor, and complete the image binarization processing using hardware, to improve the efficiency of the image processing; using timing delay analysis circuit the edge of the identification image characteristics, the data amount of the compression of the image processing; will be collected by the CCD sensor the two-dimensional image data transmission to a computer, thereby effectively shortening the transmission time of the data.

Abstract: Aiming at the strict environment limit of existing technology and industrial production in the textile industry, a multi-point temperature and humidity monitoring system has been introduced based on the wireless sensor network. The data collected by the sensors was transmitted through wireless data transmitting module. And the base station will transmit the data received from this module to the computer after data processing. Thus the temperature and humidity data monitoring management has been realized in computer. This system is developed by using the Visual C++, and has realized the SQL Server database storage by using ADO technology. Finally, the environment monitoring in the textile factor has been received and the production requirements has been satisfied.

Abstract: We established a typical ripped-rock revetment engineering geoelectric model based the resistivity difference of ripped-rock and its surrounding rock. And we also realized the models’ forward and inversion calculation for different device types of high density resistivity method using finite element method. Results show that the α device could delineate the horizontal scope of the ripped-rock better, and the γ device could reflect the bottom of ripped-rock better than the other three device. In addition, we can also get riprap’s bottom boundary according to the gradient belt of resistivity of the β device. In a real world application, we use the small subdomain filtering technology to enhance the image, better divide the riprap distribution range.