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1、Study o n a Ne w High Accura c y Dual - a xi s Ele ctro nic Le velWang Baoguang( Tianjin U niversit y , Tianjin 300072)Abstract The st udy and t he develop ment of a new dual - axis , high accuracy and low cost elec2t ro nic level have been int roduced. In t his paper , t he idea of t he overall des
2、ign is described , and t he de2 terminatio n for t he main mechanical and elect ro nic parameters , including t he overall testing , has been discussed in detail . Based upo n t he p ractical characteristic and t he specificatio ns of t he inst rument , it willbe widely used in t he field of machine
3、 tool , auto mobile , airplane and shipping manufact ures.Key Words : Elect ro nic level ; Plate sp ring ;L VD T ; Tilt measurementwo r k - piece 2 will move back alo ng t he re2verse directio n to t he tilt by t he gravit y. Therefo re , t he coil and t he co re of t he L VD T (linear variable diff
4、erential t ransfo r mer) will have relative displacement , and t he relative displacement will be co nverted to analog volt2 age o utp ut . The pair of plate sp rings are guideway to keep t he swing wo r k - piece 2 moving.1Int ro ductio nThe new dual -called tilt senso r too .axis elect ro nic leve
5、l isIt is a unique tilt mea2suring system capable of simultaneo uslyreco rding t he degree and directio n of tilt wit h high accuracy up to 1 arc - sec. wit hin a range of 400 arc - sec. , up to 3 arc - sec. wit hin a range of 800 arc - sec. It has a reading resolu2 tio n up to 0 . 1 arc - sec.The w
6、o r king p rinciple of t he inst rument is show n in Fig. 1 . It is co mpo sed of t hree part s. One part is t he co mbinatio n of t he sup2 po rt f rame and t he base . Anot her part is sta2 tio nary wo r k - piece 5 fixed o n t he top of sup2 po rt f rame . The t hird part is t he swing wo r k- pi
7、ece 2 . The wo r k - pieces 5 and 2 are co n2 nected by a pair of do uble plate sp rings 3 . During measurement if t he surf ace w hich t he inst rument is set o n is tilt , t he w hole st ruct ureof t he inst rument will tilt too . But t he swingFig. 1 The st ruct ure of t he elect ro nic level .Be
8、cause of t he simple st ruct ure of t he in2st rument , it is wo r king wit ho ut wear andManuscript received 1996 - 12 - 09 ,revised 1997210228 .第 19 卷 第 1 期王宝光 : 一种高精度的新型双坐标电子水平仪的研究23tear , also no cro ss influence upo n t he f unctio no r p recisio n . It is suitable fo r wide field of ap2 plicat
9、io n in qualit y assurance and engineering , t wo examples are given as follow s.1 . 1 Checking the f latness of mea suring ta2blesThe applicatio n p rocess is show n in Fig. 2 (a) . One head of t he inst rument is set o n a standard t riangular base . During measure2 ment , t he t riangular base is
10、 moved against a ruler step by step . Every step is just equal to a side lengt h of t he t riangle . Two dimensio nal tilt data are picked up in every step by a co m2 p uter . The anot her head of t he inst rument is set o n a co r ner of t he measured table to mo ni2 to r t he defo r matio n of t h
11、e w hole table . U sual2 ly t he micro - defo r matio n of t he w hole table is caused by t he weight of t he testing inst ru2ment wit h co ntinuo us moving.co mpensate t he tilt of a measured equip mentcan be reached. The p urpo se of using anot her head of t he inst rument is t he same as in above
12、 example .2The p rinciple of op e ratio nDuring measurement , t he inst rument isset up o n a surf ace to be measured and is ad2justed to t he zero indicatio n wit h t hree screw s8 . If t he surf ace is tilted a small angle to t he ho rizo ntal , t hen t he swing part will bear a fo rce F and a fo
13、rce co uple M . Wit h t he mul2 tiple influence of F and M , a deflectio n Y oft he do uble plate sp rings will be generated as show n in Fig. 3 . It can be exp ressed by t hefo r mula (1) :Fig. 3The wor king sit uatio n of t he plate sp rings.3FLFig. 2 Applicatio n Examples.(1)Y =24 EI1 . 2 Mon ito
14、ring the level or compensat ingthe t ilt of a mea suring equipment a u2tomat icallyThis applicatio n p rocess is show n in Fig.2 ( b) . One head of t he inst rument is set o n t he slide stage of a measured inst rument o r a machine tool . Anot her head of t he inst rument is set o n t he base of t
15、he measured equip ment . During t he slide stage moving , t wo dimen2 sio nal erro rs of t he guide way , pitch and roll erro rs , are picked up auto matically by a co m2p uter. Therefo re , to mo nito r t he level o r toHere :E is t he elastic mo dulus of t he sp ring ,I is t he mo ment of inertia . Also I = bh3 / 12 ( b is t he widt h , h is t he t hickness of t he sp rings) is know n . Because t he tilt angle iso nly wit hin 800 arc - sec. , F = Psincan bew
