基于Q_(15)的横机针位置跟踪算法

Q15-based flat knitting machine′s needle position tracking algorithm

通过分析横机的2种针位置跟踪方法,给出采用伺服电动机反馈正交编码信号的横机针位置跟踪算法原理。为了解决定点处理器浮点运算的问题,提出以Q变换进行浮点运算的方法,运用统计分析法确定Q值。在横机测试平台上进行了实时硬件仿真对比试验。结果表明,基于Q15的横机针位置跟踪算法完成1次针位置计算所消耗的平均系统时间为141.05 ns,与传统算法相比,运算效率提高了65.43%。该算法可为其他针织机械,如袜机、圆机等纬编针织机控制系统的针位置跟踪算法提供参考。

Having analyzed the two tracking methods of needle position of flat knitting machine, a new algorithm principle of needle position tracking of flat knitting machine is proposed, which is based on quadrature encoding signals feeding back from AC servo motor. The algorithm, based on Q15, is successfully applied to convert floating-point into fixed-point. The Q value is determined by statistical analysis. The real-time simulation and comparison of hardware is performed on the platform of the flat knitting machine. The results indicate that the time consumption completing once computation of needle position tracking with Q15 is 141.05 ns, and computing efficiency increased by 65.43% as compared with the conventional algorithm. This algorithm can be applied to needle position tracking of other knitting machines, such as socks knitting machine, circular knitting machine, underwear machine, etc.