Zhang Weimin

Quantitative Evaluation of Heavy Duty Machine Tools Remanufacturing Based on Modified Catastrophe Progression Method

The result of remanufacturing evaluation is the basis for judging whether the heavy duty machine tool can remanufacture in the EOL stage of the machine tool lifecycle management.The objectivity and accuracy of evaluation is the key to the evaluation method.In this paper, the catastrophe progression method is introduced into the quantitative evaluation of heavy duty machine tools remanufacturing,and the results are modified by the comprehensive adjustment method,which makes the evaluation results accord with the standard of human conventional thinking.Using the catastrophe progression method to establish the heavy duty machine tools quantitative evaluation model,to evaluate the retired TK6916 type CNC floor milling-boring machines remanufacturing.The evaluation process is simple,high quantification,the result is objective.

Research on ultrasonic echo signal detection system

In order to improve the detection accuracy of ultrasonic echo signals and ensure the useful signal could be absorbed, we study the Ultrasonic signal processing circuit. By comparing the limit, amplification, filtering and variable gain amplifier in order to choose the best option. The scheme we choose is through changing voltage to save all the low part to get more information, different from the option which gets rid of the large voltage directly.