乱序四点法直线误差分离技术

提出了一种新的时域乱序四点法直线误差分离技术, 它通过对4 个特定布置传感器的输
出数据进行冗余组合和乱序递推, 能快速精确地分离出工件的直线形状误差和工作台的直行误差运动. 该方法既避免了频域三点法中必须经过正反两次Fou rier 变换从而使计算时间相对较长的问题, 又有利于在线检测与补偿加工; 同时, 既克服了时域逐次三点法传感器之间的间距必须等于采样间隔的限制, 又可以获得更为密集的采集数据, 达到更高的分离精度.
关键词: 乱序四点法; 逐次三点法; 频域三点法; 直线形状误差
Abs tra c t: By m ean s of the redundan t com b inat ion and unconven t ional sequen t ial recu rsion on the ou tpu t s f rom fou r p robes arranged in special in tervals, st raigh tness erro r of the wo rkp iece and linear erro r mo t ion of the wo rk tab le can be ob tained qu ick ly and accu rately. Mo reover, th is p ropo sed m ethod no t on ly avo ids the long compu t ing t im e of f requency dom ain th ree2po in t m ethod, w h ich is due to Fou rier t ran sfo rm at ion and inverse Fou rier t ran sfo rm at ion, bu t also is benef icial to the on2m ach ine m easu rem en t and real2t im e compen sat ion. A lso, the lim it of p robe in tervals equaling to samp ling period in sequen t ial th ree2po in t m ethod can be overcom ed. So mo re in ten sive samp ling data can be p resen ted, and good separat ing p reci2 sion can be ob tained.
Ke y w o rds: unconven t ional sequen t ial fou r2po in t m ethod; sequen t ial th ree2po in t m ethod; f requency
dom ain th ree2po in t m ethod; st raigh tness erro r