Applied Mechanics and Materials Vol. 274

Abstract: The analytical life prediction model of natural gas well pipe in CO2 corrosion is established based on the research of CO2 corrosion. The residual life of the pipe, which will provide foundation for pipe examining and replacing decision can be calculated by the model. The research is valuable in terms of theory and practice.

Abstract: Abstract. Web as the main platform of information manufacturing, issuing, processing and transacting, has emerged massive isomerous dynamic semi-structural or non-structural information resources [1], so how to extract useful information from the mass Web resources has become a question which need to be solved. This paper introduces the background and status from domestic and abroad, and expounds the related theory and technology of text classification, constructs the Web text classification system model, gives a Web text collection algorithm and collection system. It verified the theoretical method which proposed in this paper by experiment, the result show that the extraction of information and Web classification is more accurate.

Abstract: After the research on the velocity perception, and the analysis and studies to the effect generated from various illusion forms of movement pattern speed, surveys of perceptual speed and physical speed differences, know the features of impacting the speed to perceive the special design. Form an interest that reflects a picture on the road of the geometry impact. Through the study, then prove the relationship and influence factors between the perceptual speed and geometry, which makes contribution to research development of road mode.

Abstract: Sensor sensitivity field in Electrical Capacitance Tomography is affected by the distribution of multiphase medium, which is the peculiarity of soft field, which brings great difficulty for image reconstruction, to improve the quality of image reconstruction, it is important to analyze the distribution of sensitivity field. In this paper, using finite element model, comparing the two different plotting patterns to field, then, expound a new kind of plotting pattern to field, and computer simulation to the distribution of sensitivity field. From experiments, simulation result will be fine if adopting unequal interval plotting patterns, at the same time, the result has high precision.

Abstract: An ultralow frequency vibration table can easily receive external interferences when it works. These interferences result to distortion of the output and reduction of calibration precision. A new method was adopted to reduce the distortion of an ultralow frequency vibration. At first, we modeled a vibration table by analyzing its structure, so that we got its transfer function. Then a fuzzy self-tuning PID controller was introduced and it was based on closed loop feedback theory. We verified the controller by MATLAB and experiments on an ultralow frequency vibration table. Simulation and experiments show that the fuzzy self-tuning controller can effectively reduce the distortion of a vibration table.

Abstract: For the single channel autoregressive moving average (ARMA) signals with multisensor and a colored measurement noise, when the model parameters and noise variances are partially unknown, based on identification method and Gevers-Wouters algorithm with a dead band, a self-tuning weighted measurement fusion Kalman signal filter is presented. A simulation example applied to signal processing shows its effectiveness.

Abstract: According to the present situation and development of testing variational momentum of the zero position for optical telescopic aiming system.A new measurement mechanism is designed and a new micromotion reading subdivision method is putted forward. Based of these, the main structure of micromotion reading system is described and the errors are analyzed and calculated. The experimented results show that the actual maximum measurement of this mechanism is 10.8"and the resolution is 2.16".

Abstract: In the paper the multi-gas sensor are detected aimed at the problem of cross interference between the eight kinds of toxic and harmful gases. The cross sensitive characteristics between the different gases are determined through the interference degree, and the cross sensitive model with the environment parameters is built. The BP network is designed with the Matlab toolbox and the data are trained. The results show that the forecast accuracy of the gas concentration can be improved effectively, and the average relative error is reduced. So the new method is put forward to solve the cross interference problem of dangerous chemicals gas effectively.

Abstract: This paper makes an exhaustive analysis to common defect magnetic leakage field based on dipole theory, obtaining the analytical expression of some common injury shapes and exploiting distribution curves of the magnetic field intensity by MATLAB software, and based on this a new scheme is proposed to simulate various injuries using an ellipsoid tables defect model, and finally confirms the superiority of ellipsoidal model in analysis of defect leakage field by comparison.

Abstract: Flow behavior of gas and particles is performed by means of gas–solid two-fluid model with the large eddy simulation for gas and the second order moment for particles in the riser. This study shows that the computed solids volume fractions of two cases are compared with the experimental data using a two-dimensional model. The gas and solid velocity is computed.