提出了一種新的時域亂序四點法直線誤差分離技術, 它通過對4 個特定布置傳感器的輸
出數據進行冗余組合和亂序遞推, 能快速精確地分離出工件的直線形狀誤差和工作臺的直行誤差運動. 該方法既避免了頻域三點法中必須經過正反兩次Fou rier 變換從而使計算時間相對較長的問題, 又有利于在線檢測與補償加工; 同時, 既克服了時域逐次三點法傳感器之間的間距必須等于采樣間隔的限制, 又可以獲得更為密集的采集數據, 達到更高的分離精度.
關鍵詞: 亂序四點法; 逐次三點法; 頻域三點法; 直線形狀誤差
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