提出了一種新的時(shí)域亂序四點(diǎn)法直線誤差分離技術(shù), 它通過對4 個(gè)特定布置傳感器的輸
出數(shù)據(jù)進(jìn)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(tái)的直行誤差運(yùn)動(dòng). 該方法既避免了頻域三點(diǎn)法中必須經(jīng)過正反兩次Fou rier 變換從而使計(jì)算時(shí)間相對較長的問題, 又有利于在線檢測與補(bǔ)償加工; 同時(shí), 既克服了時(shí)域逐次三點(diǎn)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(shù)據(jù), 達(dá)到更高的分離精度.
關(guān)鍵詞: 亂序四點(diǎn)法; 逐次三點(diǎn)法; 頻域三點(diǎn)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