it introduces the theory of digital radioscopy(DR) &CT testing technology, according to analyze actuality of testing for railway key parts and advantage of digital radioscopy(DR) &CT testing technology, and research the feasibility for making the technology use in railway rolling stock key parts, it concludes that the digital radioscopy(DR) &CT testing technology can fit the testing requirements of railway rolling stock key parts.
A weight least squares algorithm is developed for rational models with outliers in this paper. Different weights are assigned for each cost function, and by calculating the derivatives of these cost functions, the parameter estimates can be estimated. Compared with the traditional least squares algorithm, the proposed algorithm can remove the bad effect caused by the outliers, thus has more accurate parameter estimates. A simulation example is proposed to validate the effectiveness of the proposed algorithm.
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