¹
3(44), 2011
SUMMARIES
Dinamical
research of spherical four-bar mechanisms with taking into account basic and
additional motions. N.
Davitashvili, A. Talakvadze. “Problems of
Mechanics”. Tbilisi, 2011, ¹ 3(44), pp. 5-14, (Engl.).
In the work is given the
dynamical research of cone crusher actuator four-bar hinged crank-and-rocker
mechanism with consideration of clearances in two kinematical pairs. Are
investigated basic and additional motions of mechanism that are caused due
clearances. For all cases of motion are obtained systems of differential
equations that would be realized by computer. Are definer optimal dimensions of
clearances due keeping of that durability and reliability of cone crusher’s
actuator spherical mechanism would be significantly improved. 4 ill. Bibl. 33. Engl.; sum. in Russian.
comparative analysis of
output parameters of electric train motor car’s brake linkage with clearances. G. Sharashenidze, M. Glonti. “Problems of Mechanics”. Tbilisi, 2011, ¹
3(44), pp. 15-21, (Engl.).
In the work is carried out the
comparative analysis of growing dynamical loadings in various joint connections
with clearances of improved optimal leverage transmission of electric
train motor cars. For this purpose is applied layout of improved brake
transmission with variable coordinates system in centers of joint connections
and according generalized coordinates. For comparative analysis is considered
equilibrium conditions of shackle rod and vertical suspension of brake shoe
according of dynamic model. The basic expressions of comparative analysis of
dynamical loadings for rotation on arbitrary angle of drive link are obtained.
Is considered impact of developed from brake cylinders brake force on output
parameters of transmission. The carried out analysis gives the possibility to
select structural elements of improved brake transmission at existence of
external forces. 1 ill. Bibl.18. Engl.; sum. in Russian.
Mobile bridgelayer elevator on the bases of tank
“Leopard-2”. E.
Medzmariashvili, M. Sanikidze, O. Tusishvili, G. Medzmariashvili. “Problems of Mechanics”. Tbilisi,
2011, ¹ 3(44), pp. 22-26, (Engl.).
The three variants of
bridgelayer are discussed in this paper. Transportation and mounting of bridge
is carried from bridgelayer. As a base variant, here is selected the scheme of
cantilevered mobile elevator to install the bridge. It provides the bridge
mounting and dismantling process in 5-7 minutes and craw is staying in vehicle.
7 ill. Bibl. 4. Engl.; sum. in Russian.
CALCULATION
OF COMPOSITE FUSELAGE AIRCRAFT
BASED OSCILLATIONS ARISE DURING
TAKEOFF AND CREEP. A. Dumbadze,
Yu. Kanchaveli. ,,Problems of Mechanics’’. Tbilisi, 2011, ¹ 3(44), pp.
27-38, (Engl.).
The expressions that describe
the bending vibrations of the fuselage of a polymer fiber plastic (PFP) are received. The fuselage is considered as the beam is treated
with random light and other factors
(like high roughness of the runway, a gust of wind during takeoff, a large
gradient of atmospheric pressure and temperature, reducing the amount of fuel
and others). Not one of the expressions is not the maximum (extreme) at Thus, the study
of creep of the PFP, the definition of modulus of elasticity of the PFP at the
time of maximum vibrational deflection and use the resulting values of the modulus of elasticity in the
calculation of the fuselage is relevant.
2 ill. Bibl. 6. Engl.; sum. in Russian.
CATALYTIC
AND TURBULIZING TREATMENT OF BIOFUEL IN DIESEL ENGINES. Oleh Klyus. ,,Problems of Mechanics’’. Tbilisi,
2011, ¹ 3(44), pp. 39-43, (Engl.).
The
paper discusses possibilities of increasing the performance parameters of a
diesel engine and decreasing the emission of toxic compounds contained in
exhaust gases by using preliminary catalytic treatment of biofuel, executed
directly in the injector body. In order to enhance the impact of the catalyst
on the flowing fuel the author proposes to utilize the phenomenon of
turbulization in injector passages. The results of tests on a 359 type engine
have shown an improvement of operational parameters and a decrease of toxic
emission in exhaust gases. 3 ill. Bibl. 5. Engl.; sum. in Russian.
DYNAMIC OF THE WORK RESONANCE VIBRATION DEVICE AT THE COMPACTION
AND LEVELING OF CONCRETE FLOOR. H. Tsulaia, M. Tedoshvili, M. Chelidze. ,,Problems of Mechanics’’. Tbilisi,
2011, ¹ 3(44), pp. 44-47, (Engl.).
is investigated
that the use of single-cycle electromagnetic vibrator with
resonant excitation of vibrations for compaction and leveling of concrete
composite, gives a positive result. The intensity of
compacting processes depends on resonant setting of system and characteristics
of compacting materials. 8 ill. Bibl. 2. Engl.; sum. in Russian.
Conflict
of fundamental laws for incompressible fluid - consequence of second law
violations. A.
Aptsiauri. “Problems of
Mechanics”. Tbilisi, 2011, ¹ 3(44), pp. 48-57, (Engl.).
In the article on basis of
energy and momentum conservation laws is indicated that at the large scale
heat-insulated stream, in the onset of turbulence process or other relative
motions, there is an apparent effect of cooling from without and heat accumulation
into kinetic energy, at simultaneously fall of entropy, which contradicts with
the requirement of second law. 3 ill. Bibl. 9. Engl.; sum. in Russian.
dynamics
of machine-tractor aggregate with variable mass.
R. Makharoblidze, G. Chitaia, Z. Zhorzholiani.
“Problems of Mechanics”. Tbilisi, 2011, ¹ 3(44), pp. 58-62, (Engl.).
On
the example of machine-tractor aggregate is investigated dynamics of transient
processes with taking into account gradual decreasing of mass of root and tuber
crops in bunker of planting machine. Is generated the
formula for speed change as aggregate movement and is defined dependence of
this speed from parameters of engine, tractor and member of technological
machine by taking into account gradually decreasing of mass (volume) of
agricultural materials from bunker.
Bibl. 3. Engl.; sum. in Russian.
THE
FLOW OF CONDUCTING LIQUID IN MAGNETOHYDRODYNAMICS TUBES WITH HEAT TRANSFER. J. Sharikadze, V. Tsutskiridze, L. Jikidze. “Problems of Mechanics”.
Tbilisi, 2011, ¹ 3(44), pp. 63-70, (Engl.).
The
title problem is studied for the case when the flow of liquid is due to
pulsating pressure drop or pulsating motion of one wall or pulsating motion of
walls or pulsating pressure drop and pulsating motion of walls. Physical
characteristics of liquid flow are found. Bibl. 5. Engl.; Summ. in Russian.
dynamical
impact on deteriorations in “wheel-rail” system of four-axle (model 18-101)
tank running gear on curvilenar small radius disticts of rail path. A. Sharvashidze, D. Chitadze, D. Gogishvili, K.
Sharvashidze. “Problems of Mechanics”. Tbilisi, 2011, ¹ 3(44), pp. 71-74,
(Engl.).
In the article are considered
reasons of deterioration of inner faces rail heads and wheels flanges at
interaction of rail and four-axle tank for oil transportation. One of the
sources of deteriorations is presented by four-axle bogie of model 18-101. Is
recommended and is considered as advisable to decline from use of four-axle
tanks in operation, especially on such districts of path where occurs
curvilinear movement of rolling stock in non-standard or small radius curves at
that significantly is increased deterioration between contact surfaces of path
and carriages running gear in connection with that is complicated curve negotiation
in clearance of four-axle tank and its running gear. 1 ill. Bibl. 5. Engl.;
sum. in Russian.