DEVELOPMENT OF A NEW METHOD FOR DELIVERY OF FIRE EXTINGUISHING SUBSTANCES IN A CYLINDRICAL CONTAINER

Abstract

The delivery of fire extinguishing substances to a distant fire zone is carried out using a predominantly mechanical throwing operation. For this, the substance is placed in a special container. After being delivered to the site of the fire by means of the launching device, the container must collapse and release a substance that will allow the fire to be extinguished. In practice, cylindrical containers are used more often. Pneumatic guns are used as starting devices. But the "cannon" fire extinguishing technology has certain disadvantages, among which the main one is the difficulty of providing axial rotation of a cylindrical container to ensure the stability of its movement.

This disadvantage is proposed to be eliminated by using a fundamentally different type of rotation of the cylindrical container. Namely, it is proposed to replace the axial rotation of the cylinder with its rotational-translational movement within the vertical plane. To do this, it is necessary to use a starting device capable of providing a rotational-translational motion to the cylinder. It is assumed that the starting device provides the simultaneous action of two explosive impulses of the squibs directed at the end points of the generatrix of the cylinder. As a result of the start, the cylinder acquires the required trajectory of movement in the vertical plane.

To describe the dynamics of motion of a cylinder in a vertical plane, differential equations were compiled and solved. First, a system of differential equations was solved to determine the parabolic trajectory of the cylinder's center of mass, depending on its parameters: mass, length and radius, and also on the coefficient of air drag and on the coordinates of the starting point, the angle and speed of the cylinder departure. At the second stage, the differential equation of the cylinder rotation around the point of its center of mass is solved, provided that this point moves along a parabolic trajectory. Examples of modeling the trajectories of a cylinder depending on the values of the parameters are given.

Key words: geometric modeling, cylindrical container, differential equations of motion, rotational-translational motion of the container.