Advanced Materials Research Vols. 201-203

Abstract: This paper introduces a solution for laser scanning system, which utilizes machine vision technology. It includes algorithm for positioning and matrix for scanning control. The system can be used to detect an object and laser mark on specific position. This work explains how to use one CCD to catch an object’s position variation relative to a reference point, and how to translate the different coordination systems for laser scanner etc.

Abstract: Based on the analysis of the existing VDP document making process and VDP page description formats, this paper proposes a SVG based web-to-VDP technology, design and implements the web-to-VDP systems architecture and resource database.

Abstract: Using the elasticity and the singular integral equation method, an analysis of a bending cylinder containing inclusions is carried out. The disturbing interface stresses on the inclusion sides and the stress intensity factors at the inclusion tips are obtained. The results given in this paper are useful for the strength design of the engineering structures or mechanical components containing inclusions.

Abstract: Because of their complex structures, diverse functions, and cross-correlation among subsystems, the fault of large-scale equipments occurs easily, but its trouble shooting is difficult. Firstly, a hybrid reasoning method is proposed, and the framework of fault diagnosis system is constructed according to characteristics of case based reasoning (CBR) and rule based reasoning (RBR). Secondly, CBR and RBR applied to fault diagnosis for large-scale NC equipments are analyzed. In RBR process, the fault tree was obtained by reachability matrix, and the rules knowledge is automatically generated by fault tree, so the bottleneck of acquiring rules knowledge is solved. Lastly, this method is used in the fault diagnosis of certain large-scale NC equipment, which verifies the validity of the method.

Abstract: An index system for structure safety assessment was presented on the basis of analyzing and comparing of the domestic and foreign researchers. In addition, a method for structure safety measurement using Bayesian network, which has the excellent abilities of expressing and reasoning knowledge under uncertain environment, was proposed to construct a safety assessment model afterward. The assessment model is able to deal with complicated relationship as well as the different opinions of experts. The output of the safety assessment model can be used to predict and diagnose different safety conditions. Finally the model is applied to evaluate the security level of a certain overhead traveling crane.Its results show this method is effective and reasonable.

Abstract: With the gradual development of the study of mechanical structure design to system-level, When the system is too complex, the traditional method of calculating the structure of fuzzy reliability has been unable to calculate the fuzzy reliability of structural systems. This paper present a system based on fuzzy fault tree reliability calculation method to solve this problem, it expanse the application of fuzzy theory in the mechanical design. The method has been test in the calculations fuzzy reliability of torpedo shell structure.

Abstract: This paper presents a simple but effective method for inertial parameter identification with symmetrical trifilar pendulum and inertial measurement unit (IMU). An improvement upon conventional pendulum method is described by introducing IMU to identify the orientation of specimen by self-alignment, and then complicated equipment and experimental manipulation are not needed any more. Based on the excellent capacity of motion tracking, the IMU is also used for recording the characteristic of periodic movement by collected the information about acceleration and angular velocity. The main sources of identification errors are discussed from a set of examples. Then an experiment is carried out, and Fourier analysis is used to gain the oscillation period, which made the measurement much more convenient and accurate. The identification results are also presented by comparing with reference values computed from geometrical considerations, which proves the effectiveness of such method.

Abstract: Based on analysis of different guidelines and standards for material selection of casing which belong to six companies in four countries, the main factors that influence the material selection of casing have been generalized. Through comparing the safety and corrosion resistance properties of materials recommended by different guidelines in specific conditions, a synthetic guideline has been developed, which can provide a more appropriate suggestion. The environmental conditions and materials adopted in East Sichuan region have been taken for example. By comparing the proposed results with adopted materials of field well completion, it demonstrates that the result provided by the synthetic guideline is accurate and reliable.

Abstract: In order to reduce the impact of data noise to quality control and make monitor results more precise in manufacturing process, the method of statistical process control based on Kalman filter was proposed. In this method, the statistical process control model based on Kalman filter was built and the quality control method of exponentially weighted moving average based on Kalman filter was put forward. While monitoring manufacturing process, first the technology of Kalman filter was used to smooth data and to reduce noise, and then control charts were built by the method of exponentially weighted moving average to monitor quality. Finally, the performance of the exponentially weighted moving average method based on Kalman filter and the tranditional exponentially weighted moving average method was compared. The performance result illustrates the feasibility and validity of the proposed quality monitor method.

Abstract: ID3 algorithm is a classic method in the classification of data mining, but it has several limits that the notable one is it can not deal with constant values. This paper introduces a new Improved_ID3 algorithm and make use of it in the coal mine safety monitoring process. It has been proved from the production that Improved_ID3 can not only handle the constant attribute values, but also has higher efficiency when creating the rules. Its application in the coal mine safety monitoring is of great significance.