Simulation of dynamic of devices of systems of protection from defeat factors

Abstract

Scientific article perspective. To estimat action of factors of defeat on the elements of protective constructions and military technique is possible: by model tests on polygons; by tests on the special laboratory stands and theoretical researches yet on the stage of planning with the use of calculation models of elements of constructions. The safety of elements of constructions exploitation depends on authenticity of information about its shock strength and stability.The intensive shock loading can reduce in destruction both a separate constructive part, and a construction as a whole. For the shock loading characteristic is: a short time of action in comparison with the least periods of eigentones of construction and and evocation of the considerable relative moving of elements of construction. Significant transitions are accompanied big dynamic and contact tensions, that negatively influences on durability. Consequently, for the estimation of dynamic properties of elements of constructions it is expedient to forecast their conduct at a blow.The purpose. The purpose of work is determination of reaction of the cored element of construction at the different methods of fixing of its ends on the action of shock impulse of small duration and large intensity. Also research of influence of geometrical parameters of bar is on the size of reaction on a blow.Essence of researches, used methods. The reaction of the cored element of construction on a blow is certain from the decision of differential equation of motion of bar on the basis of theory of transversal blow of S. P. Timoshenko. Initial conditions are accepted zero. Boundary conditions depended on the method of fixing of ends of bar. Moving of points of bar in the place of blow is calculated after the integral of Duhamel taking into account the first two forms of bend eigentones. A shock impulse is given with a semisinewave form.The obtained results and conclusions. As a result of work the certain moving of points of bars is in the place of blow at three methods of fixing of ends: joint doing all the washing, hard jamming and cantilever fastening. Influence of geometrical parameters of steel bar is analysed on the size of reaction on a blow. It is indicated on pointlessness of placing of cantilever bar in constructions which work at the action of the shock loading.