Optimization of Construction of the rocket-assisted projectile

New scheme of the rocket motor of rocket-assisted projectile providing the increase in distance of flight due to controlled and optimal delay time of ignition of the solid-propellant charge of the SRM and increase in reliability of initiation of the SRM by means of the autonomous system of ignition excluding the influence of high pressure gases of the propellant charge in the gun barrel has been considered. Results of the analysis of effectiveness of using of the ignition delay device on motion characteristics of the rocket-assisted projectile has been presented

Technique of the research of characteristics of ignition of the condensed systems to variables heat flux

This paper presents a method for determining the ignition delay time of condensed systems when exposed to radiant heat flux on the sample surface. The heat flow through the focusing lens with the ability to move along the axis was applied to the sample. Changing the geometric characteristics of the optical system can be used for measurements of the ignition of samples condensed systems in a wide range of values

Gravitational sedimentation of cloud of solid spherical particles at small Reynolds numbers

The experimental results of study of gravitational sedimentation of highly-concentrated systems of solid spherical particles at small Reynolds numbers Re<1 are presented. Empirical equation for drag coefficient of the particle assembly has been obtained. The influence of initial particle concentration in the cloud on its dynamics and velocity has been analysed

Assessment of the effect of borides on the thermodynamic characteristics of heterogeneous systems

The possibility of creating high-energy materials with increased ecological purity of combustion products based on a mixed oxidizer (ammonium nitrate, ammonium perchlorate), and inorganic fuel (boron, diboride or aluminum polyboride) is shown

Dynamics of bubble rising at small Reynolds numbers

Results of experimental study of a single spherical bubble rising in the non-stationary regime in a viscous liquid (with and without surfactant) at small Reynolds numbers Re<1 have been presented. Improved empirical correlations for drag coefficient of the bubble rising with and without surfactant in the stationary regime have been obtained. Influence of nonstationary effects on the dynamics of bubble rising has been analyzed

Influence of dispersed heat-resistant additives on ignition and combustion of heterogeneous systems

The results of experimental studies of the effect of dispersion of heat-resistant additives powders on ignition and combustion of heterogeneous condensed systems. The method of measuring the time delay ignition conductive and radiant heating, and combustion rate at atmospheric pressure. The effect of additives powders of boron, silicon and titanium dioxide on the ignition and combustion of heterogeneous condensed systems

Identification of size and concentration of submicron particles on the basis of rayleigh scattering model

A method of identification of maximum size and concentration of submicron aerosol particles based on measurement of intensity attenuation of a parallel beam of probe optical radiation is described. Offered method makes it possible to determine both particle concentration and maximum particle size with controlled accuracy for aerosol media without any initial information about particle size distribution

BIOMECHANICAL CONTROL OF SPORT TECHNIQUE WITH THE APPLICATION OF VIDEO-COMPUTER MODELS

INTRODUCTION: The development of personal computers and video-technique in the 90s gave a new impulse for improving the automation of training process control. By this time, in biomechanics, the wide experiences in the analysis of human movements in sport have been yet cumulated. However, its large scale usage, based mainly on the traditional cinematography & photography technologies of movements registration, has been slowed by a complexity and capacity of digital operations during kinograms processing in practice. So a wellturned conjunction of video-technology for movement registration and very effective technology for results processing based on biomechanical analysis algorithms, already tested in multiple experiments, have had impressive results. This direction of sport training was mostly expanded in civilized states where just from the beginning of the 80s the technological base was exchanged in the athlete's movement measuring sphere to «on-line» (real time) mode. The advanced biomechanical achievements employment in sport practice resulted in a research technology exchange that was a major computerization at all levels, designing and manufacturing the highly productive and inexpensive microcomputers. That is why a more effective measuring technology and complicated precise measuring equipment which is available to register any necessary parameter, are important characteristics of this exchanging. Among the advanced technologies, the remote and non-contact researching technologies are in first place. The above statements identify three basic directions of measuring system development in sport biomechanics today: • high-speed video-cameras connected with video-film converter for personal computer; • stationary mounted dynamographic platforms operated in natural conditions of sport training and providing data output through analog-to-digital converters with personal computers; • automated videogram processing systems including personal computers. In of three cases, data fixation & processing technology while personal computer is used in «real time» mode, gives a possibility to operate with large data dimensions. At that, the accent of the research is directed to the studying of the technique model for highly skilled athletes. It became the ground for mobile laboratories with compact measuring systems which gave a possibility to control the athlete's motor action during the training process under natural conditions and to give close solutions to sport technique simulation problems. The main goal of the given research is to solve the problem of how to improve training process quality by means of skill technique improvement with elite athletes on the base of application of group and individual biomechanical models of their technique (Augulo & Dapena 1992, Haliand, Tamp & Soosar, 1988). The following main tasks were solved: • process design for biomechanical criteria control in the technique of studied actions; • identification of quantitative (kinematical) technique model for highly skilled athletes; • forecasting different variants and possibilities for element correction of studied motor action technique on the basis of video-computer animation with designed models