Summaries

Dynamical analysis of spatial five-link mechanisms with two
degrees of freedom. **N. Davitashvili.** "Problems of Applied Mechanics".
Tbilisi, 2003, ¹ 1(10), p.9-35, (engl.).

It is given the dynamical investigation of spatial five-link mechanisms with two degrees of freedom, when all links are absolutely rigid. 2 ill. Bibl. 10. Engl.; summ. in rus.

The dynamics of the hinged-lever system of breaking of a
railcar with one-sided press of shoes with clearances in kinematic pairs taking
supplementary and basic motions of system into account.** N. Davitashvili, A.
Chkhaidze, G. Sharashenidze, A. Sharvashidze."**Problems of Applied
Mechanics". Tbilisi,
2003, ¹ 1(10), p. 36-48, (engl.).

The dynamic study of the hinged-lever system for breaking of a railcar with one-sided press of shoes with clearances in kinematic pairs taking into account supplementary and basic motions of system is given. The dynamic processes of the performing plane four-link chain with clearances, singled out from the system, are described by 12 differential equations for the supplementary and four differential equations for the basic motions. 3 ill. Bibl. 8. Engl.; summ. in rus.

General differential equations of supplementary motions
for the operating mechanism with clearances of diesel engine refrigerator
railcar. **S. Sharashenidze.**"Problems of Applied Mechanics".
Tbilisi, 2003, ¹ 1(10), p. 49-55, (engl.).

In this paper, the problem of a statement of differential equations describing supplementary motions of the operating mechanism with clearances of diesel engine has been solved. The conditions of passage from one form of motion to another have been given. 1 ill. Bibl. 4. Engl.; summ. in rus.

Plane analogs of five-link and seven-link spatial mechanisms.
**G. Naruslishvili. **"Problems of Applied Mechanics".
Tbilisi, 2003, ¹ 1(10), p.56-63, (rus.).

In the work, the problem of quantitative reproduction of a motion of the spatial mechanism is solved with the help of plane mechanism. For the plane analogs of five-link and seven-link mechanisms the simplified formulas for determination of the motion laws of the output links of spatial five-link and seven-link mechanisms is deduced. 4 ill. Bibl. 3. Russ.

About stability of unstationary dynamic systems. **A.
Vashalomidze, G. Chkhaidze, B. Navrozashvili, T. Mchedlishvili. **"Problems
of Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p. 64-69, (rus.).

Results regarding stability evaluation of periodically unstationary systems on the basis of analysis of eigen-values of simple matrix of average systems are received. Bibl. 3. Russ.

Theoretical and experimental investigation of transitional
processes proceeding in constructions. **J. Bakhtadze, G. Lagundaridze, M.
Tsikarishvili, S. Bliadze, O. Kharshiladze.**"Problems of Applied
Mechanics". Tbilisi,
2003, ¹ 1(10), p.70-75, (rus.).

In the work the mathematical models of transmissive functions of the fiber-optic lightguide is worked out and the generalized transition functions of the fiber-optic lightguides are obtained. The offered numerical algorithms enable to describe the proceeding processes in real time. 6 ill. Bibl. 6. Russ.

Structural regularities of concrete as grainy composite
material.** G. Gvinepadze, D. Danelia, G. Kipiani."**Problems of Applied
Mechanics". Tbilisi,
2003, ¹ 1(10), p. 76-79, (rus.).

By methods of reliability theory is worked out the mathematic models of concrete as a composite material. 1 ill. Bibl. 2. Russ.

Dynamics of a drive of rotary working organs of a Tea-Cutting
Machines. **R. Makharoblidze, Z. Makharoblidze, I. Dzirkvadze."**Problems
of Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p.80-82, (rus.).

The formulas for calculation of angular velocity of a rotary tea-cutting machines’ working organ at the settled motion, and the optimal value of reduced moment of inertia are deduced. 1 ill. Bibl. 2. Russ.

For definition of parameters of surface cross-section of tea
espaliers after forming lopping. **N. Gabunia, N. Pkhakadze, A. Kiknadze, B.
Khomasuridze.** "Problems of Applied Mechanics".
Tbilisi, 2003, ¹ 1(10), p.83-88, (rus.).

In work method of definition of parameters of cross-section curve of leaf-assembly surface of tea espaliers after forming lopping is generalized by utilization of the method of the least squares. 1 ill. Bibl. 2. Russ.

Regularities and possibilities of laser methods for material
properties improving. **E. Semiletova, T. Dumbadze, R. Kasumov.**"Problems
of Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p.89-94, (rus.).

The results of investigation of thermohardening of st. Ó8A from solid, mixed and liquid condition under pulse radiation action are presented. The results of researches of st. Ó8A alloying with WC powder are also investigated, when powder was applied to a sample surface in thin layer or injected into the zone of simultaneous action of CO2 – laser (P=1-3 kW). 8 ill. Bibl. 3. Russ.

Damping the noise emission of a body of high speed shipmodels.
**S. Gevorkyan, A. Shahazizyan."**Problems of Applied Mechanics".
Tbilisi, 2003, ¹ 1(10), p.95-99, (rus.).

The work deals with the problem on damping the noise of vibrations in multi-layer elements of high speed shipmodels. For three-layer element it is conducted a numerical analysis concerning rigidity and loss factors. 3 ill. Bibl. 4. Russ.

On estimation of hoses durability. **Z. Arcania, I.
Saginadze."**Problems of Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p.100-103, (rus.).

In this work is stated the algorithm of the decision of the equation of absolutely flexible hoses balance, with leaking liquid, loaded with concentrated forces and taking place in air or liquid flow. The algorithm allows to estimate durability of hoses with the account by rigidity on a bend and enables to approach to a choice of parameters of a hose and parameters of an internal flow of a liquid and hereby increase reliability of hoses at operation. 1 ill. Bibl. 4. Russ.

Control and regulation of the process of gravitational
filling of metal particles into alloy liquid flow at exogeni-csuspensional
casting of Ferrosilicomanganese. **G. Jandieri, D. Robakidze."**Problems
of Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p.104-107, (rus.).

The arcicle deals with schematic and structural models of automatized control of the process of gravitational filling into ferrosilicomanganese alloy liquid flow at exogenic-suspensional casting of a solid alloy of the same chemical composition. The principles of operating of these models and their advantages are described. 2 ill. Bibl. 3. Russ.

Vegetable fuel for diesel engines. **O. Klyus."**Problems
of Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p.108-111, (rus.).

The paper presents some results of use of sunflower oil as an addition for diesel oil. It is shown that mixture can be used as a fuel in diesel engines with worn-out complete set of injection apparatus with satisfactory toxic and economic characteristics of diesel engines. 3 ill. Bibl. 2. Russ.

Increase in the effectiveness of use of energy reserves of
ship installations. **G. Behrendt."**Problems of Applied Mechanics".
Tbilisi, 2003, ¹ 1(10), p.112-116, (rus.).

The more complete utilization of the waste heat of exhaust gases of main engines is one of the ways of increasing the effectiveness in the work of ship power plants. The paper presents the results of investigations regarding the parameters of exhaust gases of low-speed ship diesels taking the real conditions for their operation into account. The obtained results testify the high compatibility of calculated and experimental data. 2 ill. Bibl. 4. Russ.

Energetic efficiency of the modern systems for automatic
defrosting of air coolers. **B. Zakrzewski, E. Partskhalaidze.**"Problems
of Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p. 117-122, (rus.).

Criteria of assessment of influence of defrosting on the general energetic indices of cooling device are presented. Data concerning efficiency of the most common air cooler defrosting systems are given. 3 ill. Bibl. 7. Russ.

Urgent issues of development of railway passenger
transportation in modern circumstances. **P. Kenkadze.** "Problems of
Applied Mechanics". Tbilisi,
2003, ¹ 1(10), p.123-127, (rus.)

The article analyses the present situation in the field of railway passenger transportation in the leading countries with well-developed railway communication, basic directions of railway passenger transportation contributing to ensuring high level of competitiveness to other means of transportation are determined. 2 ill. Bibl. 4. Russ..

Intensification of usage of traffic capacity of two-way lines. **P. Kenkadze.**
"Problems of Applied Mechanics". Tbilisi, 2003,
¹ 1(10), p.128-133, (rus.).

The article focuses upon significances of output coefficient on two-way lines dependant upon number of single trains in unified and various forms of organizations of passenger train movements. Conditions for reducing significance of output coefficient are recommended. 2 ill. Bibl. 5. Russ.