Vol 8, No 2 (2009)

The paper shows the expediency of developing an electronic reference book on thermogasodynamic properties of rocket engine combustion products taking into consideration the non-ideal character of the working process. The description of the physico-mathematical model used and the algorithm of numerical solution of the model’s equations are given. The results of the approbation of the reference book developed are outlined. Its possibilities as applied to the improvement of the existing small thrust liquid-propellant rocket engines (STLPRE) as well as for developing liquid-propellant rocket engines and gas-turbine engines using promising fuel components are analysed.

A definition of the most rigid construction for several cases of loading is given and an algorithm of its search is developed. A hybrid method of optimization is proposed which combines the algorithm mentioned and the concept of the full stress level. High accuracy of the hybrid method is demonstrated using numerical examples.

The paper shows the efficiency of blanking sheet articles by polyurethane using open and semi open methods. The results of numerical and experimental analysis of these processes are given. The influence of non-uniform unit load of a polyurethane tool on the plane ness of the articles forged is shown. An efficient forging technology and technological recommendations are developed.

A die design has been developed for compressed bending of sheet articles and cutting blanks off a strip in one stroke of the press. The die provides increased thickness of material in the bending area, reduction of the radius of bending and spring back, which improves the strength, rigidity, quality and life of the articles as well as labour productivity. The procedure for calculating the basic parameters of article production process is given. The die design has been patented.

The paper justifies objective criteria for selecting brands of soundproof materials based on the classification ranging of their soundproof properties. One hundred and forty brands of soundproof materials made by 32 manufacturers have been analysed. Information on the values of "soundproof capacity" parameter as well as on categories of the acoustic quality of some brands of materials analysed is given.

The paper deals with the problem of separation of individual signals from the additive mixture of several signals, i. e. the problem of signal identification. Two groups of algorithms for solving the problem are analysed: those based on the knowledge of channel properties and the knowledge of signal source properties. The results of modeling the algorithms under consideration are given as applied to the problem of controlling data transmission rail channels widely used in railway transport.

The paper deals with the theory and method of solving the problem of consistent evaluation of multidimensional linear difference equation parameters with autocorrelated interference in input and output signals on the basis of least square method generalization (as the most common in conditions of a priori uncertainty). The consistency of the obtained estimates of unknown true parameter values is proved.

The task of optimizing the parameters of the system of serving leaving passengers at the check-in stage in the airport building has been solved by using the method of statistical modeling. Time characteristics of the check-in stage and the capacity of the check-in system which minimize time losses and provide the proper level of comfort for passengers have been determined. Detailed stochastic portraits of passenger service system functioning for the actual conditions of operation of the International Kurumotch airport (Samara) have been obtained.