Advanced Materials Research Vols. 503-504

Abstract: The paper, based on expressway cases of foundations reinforcement by compaction grouting, presents the results of comparative test among the different traditional engineering method, including soil test, in-situ test, deflection test. It is proved that the application of transient Rayleigh wave(TRW) technology will greatly improve the efficiency of highway surveys, with advantages of high-efficiency, wide –use, non-destructivity and reliability.

Abstract: Calibration is crucial to the accuracy of grating measurement, which directly determines the accuracy of the measurement. The traditional calibration principle is easily influenced by some factors in projection measurement for lack of flexibility. This paper presents a new calibration method by using and improving Zhang’s Calibration Method, by which high accuracy and efficiency are achieved with low cost.

Abstract: To overcome the disadvantages of existing large-scale coordinate measurement systems about low level of automation and poor parallelism, this paper introduces a novel system which characters multi-sensor measuring network, while a single sensor measures angle via a couple of non-parallel planar laser beams rotating around a fixed shaft. The novel method for measuring angle improves automation in large-scale coordinate measurement. Furthermore, measuring network assures that measurement accuracy keeps to the same level even when the measuring range is enlarged. Measurement model and calibration are the key technologies of the system. They are the main sources of measuring errors. Therefore, to minimize the error, a practical global calibration method for the multi-sensor network system is proposed, with constructing a precise mathematical model. In this model, the parameters of the system are divided to inner and outer parts. While the inner parameters are obtained by aided instrument, the outer which means transform parameters between different sensors are figured out in spot calibration. Finally, the objective function based on transform coefficients between different sensor coordinate systems is defined and the outer parameters are optimized by bundle adjustment method. Thus, the whole system can finish global calibration by one time，and no medi-coordinate-frame is needed．Therewith，transformation time of coordinate frame decreases and calibration process is facilitated. Finally，measurement experiments are conducted with root mean square(RMS) error of not more than 0.1 mm.

Abstract: Based on the study of coiler tension indirect control process, the purpose is to improve the control accuracy of the constant tension by the introduction of RBF neural networks and inverse system control theory. Depending on the physical characteristic of coiling tension control process, it could build the inverse system model for coiling tension control. By analyzing simulation results, this control strategy has great significance to the actual production.

Abstract: This paper presents a 3D body measurement system based on structured light. We analyze the principal of projection profile measurement and model binocular system with two cameras which comprise a stereo vision system. The goal of calibration method is to achieve the high accuracy for human body dimensions. The system software based on VS 2008 and OpenGL provides a visual interface with standard data interface for CAD/CAM.

Abstract: Retroreflective film are used widely in traffic and municipal field as information carrier, the retroreflection index is considered the most important parameter, test methods of this parameter including absolute and relative method, traditional instruments are consisted of light source, photometric detector, angle adjust device, etc. The complex structure of instrument add the uncertainty component, so reflectance spectrum is used to calculated the film retroreflection index, this method would improve the testament accuracy and provide more light sources choices without structure adjustment.

Abstract: The Tin coating thickness has significant influence on the quality of the mobile phone case product. It is very difficult to obtain the Tin coating thickness using conventional testing method. This paper proposes a new technique for efficient and accurate measuring the Tin thickness plated on the surface of mobile phone case products through analyzing the section image of the product derived from SEM. A computer image analysis has been carried out to obtain the thickness of the Tin coating. In the paper, we describe the detailed sample preparing processes which involve the use of rubber container, clamp, PS resin, firming agent, polishing machine, 3000 mesh sanding paper, silk, SEM and other tooling, scanning the sample section with SEM to obtain the image in computer and analyzing the image in the computer. This new method is very efficient and quite accurate, thus can be used in the production line to monitor the Tin coating thickness to help control the product quality.

Abstract: The coal dust storms create great harm to the environment and human health. The main source of coal dust is the low coal moisture on various types of coal conveying belt. The intensity of coal dust is heavy, especially in the coal-fired power plant, coal transportation coal conveyor belt and in areas, where various reprint point was heavy. In this paper, a measurement method on moisture content of coal conveying belt was proposed. The local group based on the probability can eliminate the factors affecting measuring accuracy such as the big piece of coal, the thickness of coal seam, and coal rock. The rationality behind the measurement was verified by simulation experiments. The proposed method gives an effective method to measure the moisture content of coal on the conveyer belt and provides technical support to prevent the spontaneous combustion and explosion of coal when the moisture content of coal is too low.

Abstract: There is strong interest in a robust lower power wireless solution for utility meter reading, especially for reading electricity meters. This paper describes a mesh network that is relatively simple to implement and takes up less resources than well known alternatives such as Zigbee.

Abstract: With respect to airport damage assessment problem, the analysis method is proposed. The airport damage is assessed according to the secondary fuzzy comprehensive evaluation model. Then the evaluation method of target damage level is given by the compare methods of interval numbers. Finally, the example calculations are given to demonstrating the effectiveness of this method.