Papers by Keyword: Sampling Method

Abstract: Optimization of a flatness error inspection activity on coordinate measuring machine (CMM) is a very crucial problem which demands minimization of a probe path for productive inspection. In the present work, the approach is explained to minimize the total probe travelling length and hence, the time of flatness inspection. Three sampling methods with eight sample sizes have been considered for this work. The ant colony optimization (ACO) algorithm based on travelling salesman problem (TSP) approach was developed in MATLAB environment to find the shortest probe paths. It was verified that the probe path depends on the sampling method used to measure the flatness. The sampling method giving the shortest probe path was selected as the best-suited method for a particular sample size. The results obtained by analyzing an illustrative example shows that the proposed approach is both effective and optimum.

Abstract: By analyzing the component population and the requirements in the standards, we proposed sampling plan for project site. We can gain the lot acceptance by the minimum sample size.

Abstract: Based on the analysis of the method of natural sampling, symmetry regular sampling and all kinds of asymmetry regular sampling, a sampling method based on MATLAB and MCU is presented in this essay, which is called digitized quasi-natural sampling method. With the use of the powerful operation ability of MATLAB in this method to calculate the numerical value required in advance, much more operation burden of MCU is reduced , then MCU can do the control easily according to the value presented. By the division of labor cooperation the calculation precision and control speed can be ensured at the same time, thus very strong practicability does the digitized quasi-natural sampling method have.

Abstract: The higher order maximal orthogonal vector basis functions are used to get targets sampling information in interpolation/extrapolation of electromagnetic responses in time and frequency domain. With the method, the computational complexity of sampling would decrease sharply without loss of accuracy. As a result, the proposed method solved the problem of high computational complexity and great resource consuming of traditional sampling method. Some numerical results are given to verify the high efficiency and accuracy of this method.

Abstract: For an inverse potential scattering problem of stationary Schrödinger equation, we employ a direct sampling method to reconstruct the support of the potential. Compared with the general sampling method, the method we adopt is applicable even when the measured data (near-field data) are only available for one or several incident directions, and has the advantages of simple computation and insensitivity to noises. By the mathematical derivations, we conclude theoretically that for both two dimensional and three dimensional cases, this direct sampling method is feasible and efficient.

Abstract: The evaluation of the reliability of structural systems is of extreme importance in structural design, mainly when the variables are random. A method is presented to efficiently assess the random response of stochastic structures. The article uses two-level sampling method to partial fiber element. First, the homogeneous random field of concrete and rebar can be created by modified Latin-hypercube sampling. Then section discretization method is adopted to assign fiber random variables of concrete section fiber. The algorithm is then used to analyze the random response of a concrete beam, and the result proves that the method is efficient.

Abstract: According to problems of flatness error measurement of revolving body end-face, sampling method and evaluation method are studied in this paper. First, spiral sampling method is presented, in order to meet the needs of flatness error measurement sampling of revolving body end-face. Second, combined with least squares method, mathematical model applied to flatness error measurement evaluation of revolving body end-face is proposed. Finally, through the simulation, the mathematical model is proved to be correct.

Abstract: This paper analyzes the origin of maintainability test sample, discusses the problems which exists in the selection process of similar maintenance tasks in GJB2072-94, provides the first level of sample grouping methods based on equipment entity and work relationship of maintenance, and also puts forward the method of maintenance task similarity degree in the second level of sample grouping by maintenance time.

Abstract: An analytical study of high-temperature corrosive failure in a waste incineration plant was conducted using a new type EPMA equipped with a Schottky type field emission gun. For sample preparation, a cross-section polisher that uses an argon ion beam was applied. Both the element distribution through the alloy substrate to the scale and the chemical states of sub-micron sized corrosion products were revealed, leading to inferences about the corrosion mechanism.