The acoustic emission signal of aluminum alloys spot welding includes the information of forming nugget and is one of the important parameters in the quality control. Due to the nonlinearity of the signals, classic Euclidean geometry can not be applied to depict exactly. The fractal theory is implemented to quantitatively describe the characteristics of the acoustic emission signals. The experiment and calculation results show that the box counting dimension of acoustic emission signal, between 1 and 2, are distinctive from different nugget areas in AC spot welding. It is proved that box counting dimension is an effective characteristic parameter to evaluate spot welding quality. In addition, fractal theory can also be applied in other spot welding parameters, such as voltage, current, electrode force and so on, for the purpose of recognizing the spot welding quality.
展开▼
机译:La fonction des identifications “comme si” dans un cas de psychose masquée↓A fun??o das identifica??es “como se” em um caso de psicose mascarada↓La función de las identificaciones “como si” en un caso de psicosis enmascarada↓Die Funktion der ?als ob“ Identifikationen in einem Fall maskierter Psychose↓在一个掩蔽精神病的情况,“好象”的识别作用
机译:识别从糠疹糠疹患者中分离的马拉色菌酵母菌种鉴定马德里na pit pit pit pit vers vers vers vers vers ser ser ser sul sul sul sul sul sul Bras Bras Bras Bras Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification Identification