CONTRIBUTIONS TO THE THEORETICAL STUDY OF THE PRECISION SOWING MACHINES DYNAMICS
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1 COTIBUTIOS TO THE THEOETICAL STUDY O THE PECISIO SOWI MACHIES DYAMICS S. O. Oi nd S. Poecu Atct: In the e e eoted the equivent dynmic mode nd min mthemtic mode of the eede unit of eciion owing mchine ccoding to the couing to the fme mechnim tye, ocitoy od mechnim, ocitoy eogm mechnim, nce mechnim nd ncing m mechnim. The dynmic nd mthemtic mode which e ceted ow the detemintion y ccuu (comute imution) of the gound nom ection uon the comction whee we of othe dynmic nd kinemtic mete of the woking ytem fo the nyzed owing ection. Key wod: eciion eede, dynmic mode, mthemtic mode, oi ection, wok tiity ITODUCTIO The min cheme of the eede unit fo eciion owing mchine e hown in figue, fo which thee wi e mde dynmic nd mthemtic mode futhe on in ide unning condition, on hoizont tein t contnt eed, in ode to etih the mete on which thei tiity deend duing the woking oce. ig.. The min cheme of the eede unit fo eciion owing mchine: with ocitoy nd djuting woking deth whee; with eogm mechnim nd djute etting whee; c with nce eve tye; d with ocitoy m. MATEIAL AD METHODS. Dynmic nd mthemtic modeing of the mechnim with ocitoy nd djuting woking deth whee om the kinemtic nd dynmic oint of view thi tye of eede unit (fig. ) eeent tht ocite ound the joint O, woking deth eing djuted y men of the djuting whee fo woking deth (tht otte ound O 4 nd diu ). uthe on thi ocitoy thee i the joined fok of the etting whee, which i eticy foced ound the joint O with the moment M in the diection of inceing nom ection etween the etting whee nd the oi t. In ode to detemine the nom ection of the oi uon the ettement whee t., we wite the equiiium eqution of the moment egding joint O, negecting the oing eitnce moment M, ( it i vey m), hence it eut:
2 () ( ) t h [( h ) ] M ( in co ). ig.. Dynmic mode of the eede unit equied with the ocitoy nd djuting woking deth whee. It i noticed tht the tiity of the ytem on the oi ( 0) deend oth on the dvncing eitnce of the he tht incee with the woking deth nd tend to ie the ocitoy nd the etic moment M, which tend to ie the he fom the oi.. Dynmic nd mthemtic modeing of the eede unit with eogm mechnim nd djute etting whee (ig. ) om the kinemtic oint of view thi tye of eede unit eeent fme on which the etting whee i fixed (djute veticy) nd eectivey t the othe extemity of the kte tye he. The fme i tied y men of the tie O O nd eectivey O O 4 kinemtic eement, which e ticuted to the eede fme nd t the fme of the eede unit, thu eizing defome eogm mechnim. The kinemtic eement O O nd O O 4 e of the me ength nd incintion to the hoizont of the ce, defined y nge β. Becue the necey tction foce (doe not e on the cheme) i t X X X X 4 nd in ode the ection to e tiony cught in the fme of the mchine, it i necey tht X X nd it eut tht X X 4 we. Thu, fte tnfomtion, the nom ection uon the etting whee ecome: () ( ) h [( / ) ( ) ] ( / )( h h )( in ) in 4 It i noticed the deendence of the nom ection on the etic foce, given y the ytem of ing, we y the eitnce to dvncing of the he, which, t it tun, deend on the woking deth.
3 ig.. Dynmic mode of the of eede unit with eogm mechnim nd djute etting whee. Dynmic nd mthemtic modeing of the eede unit with nce eve The nce eve tye eede unit with nce eve mechnim (ig.4) eeent uoted y two whee whee in font nd the econd whee ehind, which in mot itution h the oe of etting whee. On the fme of the eede unit, etween the two whee, thee i kte tye he, joined togethe with it, whee t the me time it i ticuted oth with the tie (joint O ) tht eve oth to the tction of the ection nd the ing ytem tht ovide uementy foce, of etic ntue, necey fo inceing the contct eue etween the whee nd the oi necey condition in ode to hve continuity of the oing, tht i the contnt deth of eeding, we the unifom etting of the ow of eed. ig.4. Dynmic mode of the eede unit equied with the nce eve tye. In ode to exe the nom ection of the oi uon the whee, we wite the equiiium eqution of the moment, egding the contct oint etween the whee nd the oi A nd B eectivey. Thu, fte tnfomtion, it eut:
4 ( ) ( ) ( ) [ ] ( ) ( ) / co co in (), whence it eut tht the nom ection of the oi uon the font whee incee togethe with the foce in the ing ytem nd decee togethe with the eitnce to dvncing of the he, eectivey the woking deth nd o decee when the tction foce incee. Simiy, fom the equiiium eqution of the moment egding contct oint B ( M B 0) etween the font whee nd the oi it i detemined y the nom ection of the oi uon the ck whee B,which in the mjoity of ce i o the etting whee: ( ) ( ) ( ) [ ] ( ) ( ) / co co in (4) om the ove etionhi it eut tht the ection of the oi uon the etting whee incee with the weight of the whee nd of the eed ox nd with own weight of the kte we with the etic foce in the ing nd decee togethe with the wok eitnce of the he (theefoe with the eeding deth ) nd with the tction foce tnmitted in the ticuted tie in the couing O 4 nd O. 4. Dynmic nd mthemtic modeing of the eede unit with ocitoy m ig.. The dynmic mode the eede unit with ocitoy m
5 The eede unit with ocitoy m eeent n m () ticuted in the eede fme, which ocite ound the ticution oint O nd i uoted y the oi of uot (etting) whee in oint A (ig.). If i negected the oing eitnce moment M of the etting whee (it vue e m) nd fte tnfomtion in the equiiium eqution, eut the ection on the etting whee : O ( h h ) ( h h ) O O O f h O f h O O in O O co M O ( f h ) O d h O () It my e noticed tht the fit tem i oitive, o the foce, S, nd z (whee z in) od the uoting (etting) whee, nd the econd tem (y the foce,, T nd (whee COCLUSIOS d x co ) tend to unod thi whee. x. om the kinemtic oint of view, the high eciion eede unit my e conideed mechnim, utined on uot whee oing on oi. In ode fo the dynmic nd mthemtic modeing to e cied out, the eede unit mut e educed to ticu ce of ime mechnim.. o n efficient oetion of eede unit duing the woking oce, it i necey fo the uot whee to emnenty ty in contct with the oi. Thu, it i eenti to etih the mthemtic etion of how the oi ct uon the whee thee unit e utined on.. Stting fom the mthemtic etion tht how how the oi ct uon the uot whee of the eede unit, we cn nyze the deendence of the oi contct oce on the contuctive nd function mete of eede unit. EEECES []. Oiş, O.S., Poecu, S. eeche concening the dming of vetic ocition of the wok unit of the eciion eeding mchine fo imoving the eeding mete. In: Poceeding of the Intention Confeence eech Peoe nd Actu Tk on Mutidiciiny Science June 007, Lozenec, Bugi, Vo., []. Poecu, S., Oiş S. Mşini de emănt de ecizie. Pocee de ucu, contucţie şi exote. În: Mecnize Agicutuii, 007, n., [4]. Soucek,., Piig,. Mchinen und eäte fü Bodeneeitung, Düngung und Aut. Veg Technik mh, Bein, 990. ABOUT THE AUTHOS S. O. Oi, Ph D, Tnivni Univeity of Bov, Bdu Eoio 9, 0006 Bov, omni, E-mi: ondo7000@yhoo.com S. Poecu, Ph D, Pofeo, Tnivni Univeity of Bov Bdu Eoio 9, 0006 Bov, omni, E-mi: imio8@yhoo.com
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