壓力容器焊接質量控制中的數(shù)據(jù)挖掘方法及其應用研究
[Abstract]:At present, welding is becoming more and more important in the manufacturing process of pressure vessels. In order to ensure the quality of pressure vessels, the control and management of welding quality is particularly critical. With the rapid development of computer technology and database technology, the modern manufacturing industry has produced massive data in the process of production. Obviously, the traditional statistical method is in a dilemma and can not meet the needs of the development of the times. Aiming at the problem that mass data can not extract knowledge in modern manufacturing industry, this paper applies data mining technology to welding quality control in manufacturing industry, combining with the actual project of a company. On the basis of previous studies, this paper focuses on the work of welding quality control of pressure vessels. The research contents are summarized as follows: first, aiming at the phenomenon of nonconformity of welding quality of pressure vessels, the quality management 5M1E (operator, machine equipment), Raw materials, process methods, environment and measurement, etc., the whole process, multi-direction, multi-angle to analyze the factors that affect the welding quality of pressure vessels, and reduce the abnormal range of welding quality. Secondly, this paper proposes a classification method based on feature selection and decision tree C5.0. Firstly, the feature selection algorithm is used to reduce the dimension of a large number of features. The decision tree C5.0 algorithm is used to construct the welding classification model, so as to find out the influencing factors that affect the welding quality. Regard these important factors as "quality control points" and strictly control them. Finally, the decision tree algorithm is compared with the neural network algorithm and the Logistic regression algorithm. The experimental results show that the accuracy of the decision tree algorithm is better than that of the neural network algorithm and the Logistic regression algorithm. The result of decision tree analysis is applied to the actual welding work of the company, and the welding problem is obviously improved. Its concept and guiding ideology have a definite value of popularization and application in the pressure vessel manufacturing industry.
【學位授予單位】:天津工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG457.5
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