缠角 meaning in Chinese

angle of rifling
angle of spiral
angle of twist
twist angle

Based on in - depth analysis on characteristic and function principles of psd , combined with characteristic of measured object , this article presents an new real - time measurement for symmetrical degree , guiding - groove , twining angle , inside radius of long direction pipe ; completes designing work for hardware of function module and application software ; and gives analysis and computation on error sources and uncertain - degree of measure result . based on above work , this article develops a parameter - auto - chosen , integrated and automatic measurement device for beeline degree , guiding - groove symmetrical degree , twining angle and inside radius of long direction pipe
本文在深入分析研究psd的特点和工作原理的基础上，结合被测量对象的特点，首次提出了长定向管导槽对称度、缠角、内径等实时自动化测量的一种新方法；完成了硬件功能模块及应用软件的设计工作；并对测量结果的误差源及不确定度进行了分析和计算；在此基础上研制了长定向管的直线度、导槽对称度、缠角及内径等参数自动、实时综合测量设备。