#3(48), 2012

SUMMARIES

 

kinematics of seven-bar Automatic manipulator. N. Davitashvili. Problems of Mechanics. Tbilisi, 2012, 3(48), pp. 5-12, (Engl.).

In stated the description, principle of operation and kinematical analysis of newly invented seven-bar spherical automatic manipulator that is created on the basis of spherical four-bar crank-and-rocker mechanism. Are defined kinematical parameters of automatic manipulator, results of that age stated for its dynamical analysis. 3 ill. Bibl. 11. Engl.; sum. in Russian.

 

KINEMATIC SYNTHESIS OF THE MOTION GENERATION OF LINKAGES. Mehmet İsmet Can Dede, Duygu Çömen, Gökhan Berker, İlkay Erkılınçoğlu. Problems of Mechanics. Tbilisi, 2012, 3(48), pp. 13-20, (Engl.).

The kinematic synthesis of two degree-of-freedom (DoF) manipulators is studied. Firstly, the motion generation requirements of manipulators are established according to the problem statement. Mathematical models for three and four poses of the gripper are determined. The motion generation synthesis of planar manipulators as a systematic methodology is presented. Dimensions of two-DoF manipulator are determined by interpolation approximation method. Finally combining the two real synthesis solutions of two-DoF manipulator kinematic synthesis for motion generation of four-bar linkage is accomplished. 3 ill. Bibl. 15. Engl.; sum. in Russian

 

general task of dynamics of slider-piston mechanism with clearances in kinematical pairs. N. Davitashvili, V. Bakhshaliev. Problems of Mechanics. Tbilisi, 2012, 3 (48), pp. 21-31, (Engl.).

Is stated the general analysis of crank-piston mechanism with clearances in kinematic pairs. Is revealed that at existence of three clearances in kinematic pairs the solution dynamics task with taking into account the basic and additional motions of mechanism is significantly complicated. Is recommended to carry out the solution of dynamics task at existing of clearances in two kinematic pairs of mechanism. 2 ill. Bibl. 25. Engl.; sum. in Russian.

 

PARAMETERS SYNTHESIS OF THE HYDRAULIC POSITIONING SYSTEM WITH THE CONSTANT FORCE LOAD. G.V. Kreinin, S.Yu. Misyurin. Problems of Mechanics, Tbilisi, 2012, 3(48), pp. 32-37, (Engl.).

The synthesis of a fast-acting positioning system with a hydraulic drive and a mechanism with constant transfer ratio that displaces mass and force load are considered. The procedure is based on a dimensionless dynamic similarity criterion and the criterial relationships that make it possible to find the nearly optimal values of all the basic parameters of the actuating device, the mechanism, the distributing device, and the digital control system. 4 ill. Bibl. 7. Engl.; sum. in Russian.

 

KINEMATIC SYNTHESIS OF PATH GENERATION OF PLANAR MECHANISMS. Mehmet İsmet Can Dede, Duygu Çömen, İlkay Erkılınçoğlu, Emre Uzunoğlu. Problems of Mechanics, Tbilisi, 2012, 3(48), pp. 38-42, (Engl.).

Kinematic synthesis of planar mechanisms is studied. Path generation method is applied to generate planar four-bar mechanism. The task of synthesis refers to a problem in which a coupler point is desired to generate a given path. Nonlinear systems of equations with one constraint equations for each independent loop are obtained. Generated square equations with respect to the Lagrange coefficients are solved by using interpolation approximation method and design parameters are obtained. Results are given in tables. 2 ill. Bibl. 6. Engl.; sum. in Russian.

 

passability of tandem-wheeled self-propelled chassis. R. Makharoblidze, I. Lagvilava, O. Asatiani, A. Kobakhidze. Problems of Mechanics. Tbilisi, 2012, 3(48), pp. 43-47, (Engl.).

The passability of tandem-wheeled self-propelled chassis is evaluated by such relative indicators as passability on the wheels sinking into the ground, patency of passability on bearing capacity, passability on adhesion of wheels, passability on engine traction, a passage between space between rows crops and tea plantations. The passability indicators give the possibility to take into account the soils rheological properties and the parameters of adaptive tandem wheeled self-propelled chassis. Bibl. 5. Engl.; sum. in Russian.

 

theory of soil compaction by running bodies of adaptive tandem-wheeled self-propelled chassis. R. Makharoblidze, I. Lagvilava, O. Asatiani, A. Kobakhidze. Problems of Mechanics. Tbilisi, 2012, 3(48), pp. 48-53, (Engl.).

The theory of soil compaction by running bodies an adaptive tandem-wheeled self-propelled chassis is developed. Proceeding from the soil rheological properties and parameters of adaptive tandem-wheeled self-propelled chassis in the deformation distribution zone is defined functional dependency between soil average density and running parts of adaptive tandem-wheeled self-propelled chassis. Is developed the technique of calculation of all physical values that are stipulated due standard for assessment of running systems parameters impact on ground. Due these parameters is stated the comparison of experimental and serial self-propelled chassis. 1 ill. Bibl. 6. Engl.; sum. in Russian.

 

DEFINITION OF IMPACT INTERACTION PARAMETERS AT GRIP OF METAL BY MILL ROLLERS. T. Natriashvili, S. Mebonia, M. Mikautadze, D. Demetradze. Problems of Mechanics. Tbilisi, 2012, 3(48), pp. 54-59, (Engl.).

The method of selection of the calculation scheme and the reological model of impact process of rolling and tube mills elements is given there. The formulae for definition of the impact process main parameters are presented. 3 ill. Bibl. 8. Engl.; sum. in Russian.

 

research mode of deformation of thin depressed shells with elliptical holes. I. Badzagua. Problems of Mechanics. Tbilisi, 2012, 3(48), pp. 60-64, (Engl.).

Is considered depressed shell with elliptical holes, which two opposite sides are rigidly fixed, and other two opposite sides are simply supported. Are considered two cases: the shell with small hole and shell with large hole. For the calculation of shell with small hole is applied generalized method and for shell with large hole is applied the method of contour points discretization method. 1 ill. Bibl. 4. Engl.; sum. in Russ.