Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Special features of dynamic design of a tractor track

Ivantsov V., Ivantsov A., Ivantsov S.

Journal of KONES

2009

Vol. 16, No. 1

203-207

In the paper chosen problems of dynamics of caterpillar finger in an open metal seven eyelet hinge is described. A low reliability of the caterpillar chains seems to be a consequence of design proces s of agricultural tractors. For this reason, dynamic calculation of the caterpillar finger of tractor is presented. Probe is spent on tractor VT - 150 manufactures TK "VgTz" having caterpillars with seven eyelets cast track in a mode of correction of the set direction of working-class movement on plough. In the paper example results of theoretical and experimental researches is presented. Results of the study experimental of the dynamics loads in caterpillar finger of the tractor with plow have shown that it is possible his consideration as springy symmetric steel peg on two steel full tilts. Analysis of usage of the agricultural caterpillar tractors and results of calculations confirm that the dynamics calculations are more exact then previous assumptions. New recommendations to caterpillars constructors are put in order to increase tractors reliability. The frequency of caterpillar finger should be enlarged by increasing of his acerbity. In the paper, a new set of main parameters of VT — 150 caterpillar fingers is presented in comparison with nominal one.

Articulated palaeoscolecid sclerite arrays from the Lower Cambrian of eastern Siberia

Ivantsov A., Wrona R.

Acta Geologica Polonica

2004

Vol. 54, no. 1

1-22

Phosphatized palaeoscolecid cuticle fragments of Palaeoscolex lubovae sp. nov., P. spinosus sp. nov., Palaeoscolex sp. and Sahascolex labyrinthus gen. et sp. nov., as well as disarticulated sclerites, are described from the Early Cambrian Sinsk Formation (Siberian Platform) at the Achchagyy Tuoydakh fossil-Lagerstatte. These remarkably well preserved arrays of plates and platelets display ornamentation identical to widely reported isolated sclerites assigned to Hadimopanella, Kaimenella, Milaculum, and Utahphospha. The precise relationship of the Palaeoscolecida to the priapulids or alternatively with the nematomorphs remains under discussion, but suggested is their systematic position within the superphylum Ecdysozoa, comprising moulting animals. some of the described cuticular trunks exhibit distinction between the dorsal and ventral sides: nodular sclerites occur on the dorsal and spiny sclerites on the ventral sides of the worm body. Such a pattern of ornamentation may suggest adaptation for a level-bottom, vagile benthic and probably epifaunal mode of life. The Siberian palaeoscolecids are compared with the type species of Palaeoscolex, P. piscatorum Whittard, 1953, and with palaeoscolecid worms from Australia, Bohemia and China. Sclerites recorded with microplates accreted into the basal brim may support a hypothesis that the more complex sclerite structure bearing a series of nodes was derived from simple small sclerites with single node. The biostratigraphic utility of isolated sclerites remains low, because of the same morphology occur in different sclerites may occur in one scleritome.