基于LabVIEW的GMAW短路过渡电信号周期参数提取

传统的参数提取是使用汉诺威分析仪或其二次开发,在LabVIEW中,先前的提取方法操作不便且易受噪声影响而出错,文中根据LabVIEW脉冲测量函数,以电压短路结束为中心,在对应的电流波形的一定范围内查询最大值是否小于阈值为标准,判定是否为瞬时短路,将测量函数制作成子vi;为改善程序结构提高人机交互性,使用JKI状态机,以U-PDD,I-PDD为辅助,设计简洁的人机交互界面,选择合适的参考电平和阈值电流,测量得出短路时间、短路周期时间变化图、频次图及其变异系数。试验表明此方法可以准确的测量所需要的结果。

Extract periodic parameters of GMAW electric signal with short-circuit transition craft based on LabVIEW

Traditional parameter extraction method is to use Analysator Hannover or it’s development,the previous extraction methods is hard to operate and easily go error by noise in LabVIEW.In this paper,based on the LabVIEW pulse measurement function and centered on the ends of a short circuit voltage signal,the corresponding current waveform with a certain range was checked whether it’s maximum value was less than the threshold value as the standard,and was determined whether it was an instantaneous short circuit.The measurement function was made into a sub vi.In order to improve the program structure and human-machine interaction,JKI state machine was used to design a concise human-machine interface with U-PDD and I-PDD as assistants.By selecting the appropriate reference level and threshold current,variation diagram and frequency diagram of short circuit time,short circuit cycle time,frequency diagram and it’s variation coefficient were measured.Experiments showed that this method could accurately measure the required results.