Device for extinguishing forest fires

 

The invention relates to the protection of the environment, namely, devices for extinguishing forest fires reflected waves directed blasts. The proposed device consists of independently made frame containing adjustable cantilever elements that hosts point or wire explosive charge in a pre-calculated focal point F, and screen-reflector (with focus at point F), which is made as a package of elastic laminated rectangular plates attached to the frame and provisonally with elastic guide supports axial loads acting in the direction of one of the characteristic dimensions of the screen-reflector. Use as a reflective screen laminated elastic shells or plates increases the strength of the screen-reflector. For him, the calculated estimated allowable stress strength under impact loading by the blast. This allows you to choose the suitable materials for the various layers of the package screen-reflector, and to set the necessary number of layers, their thickness, Flexural rigidity (elasticity) and the optimal mutual arrangement. Due to these design features and efficient computational methods proposed elimination of tositsa to habitat protection, namely, devices for extinguishing forest fires shock waves directed blasts.

Among the devices used to extinguish forest fires, are known, which are based on the enhancement effect of the action of shock waves on the object fire fighting due to the additional use of impact waves reflected from a special screen and directed towards the top (ground fire), for example [1].

The device consists of a flat screen-reflector, in front of which is a point or corded charge explosives (he). After you install this device on the path of fire - VILLE is located between the front of a forest fire and screen-reflector - charge undermine. Because of this, or create a barrier to the spread of fire (the so-called fire break), or stop its further spread, or both.

This device is selected as the analogue, has its main disadvantage is its relatively low efficiency. Useful energy of explosion of the explosive charge is partially reflected and sent (along with a major component of the blast wave) as a cocurrent wave toward the front of the fire, and partly useless scattered in the other direction is the work of [2].

A more effective device is a reflector for extinguishing forest fires shock waves directed blasts [3].

Here, the device includes a screen-reflector in the form of a sinusoidal cylinder, made by elastic bending of the longitudinal force initially flat sheet metal of rectangular shape; and bending elasticity is fixed steel rods, and the explosive charge, a point or wire, placed in a pre-calculated focal point F in front of the screen-reflector on the same reinforcement rods, which together with screen-reflector form a frame.

The disadvantages of this device, selected as a prototype, should include the following:

First, limited opportunities (for screen-reflector) in the embodiment are in the form of sinusoidal cylinder”, achieved through elastic bending of the longitudinal force initially flat rectangular metal sheet.

Indeed [4], while simplifying the expression for curvature is not flexible rod systems longitudinal forces, converted to compressive forces and bending moments will be the guide for forming a direct search of the cylinder (one half-wave sine wave) with amplitudephase. When bulging flexible rod systems for the achievement of significant magnitude of deflection of the curved axis of the rod system is only “roughly approximated” can be taken as a sine wave. That is not responding strategies for achieving goals.

Secondly. As follows from the description of the prototype and the first of our observations point or corded charge is located on the reinforcement rods (fixing elastic bending of initially flat rectangular sheet metal). Thus, the explosive charge cannot be located accurately in the pre-calculated focal point F in front of the screen, represented theoretically as a simple sum of the bent rod systems. Because, on the one hand, this point with a slight curvature of the bend screen-reflector (small depressions) will be almost “infinite” removal; on the other hand, the fastening curved screen, locking steel rods does not give rise to reliably differentiate itself where we expect the system (screen) and the environment (swivel, fixed or a combination of support).

In third. The first and second disadvantages are particularly significant for screen-reflector, which is actually the shell, and the same type of core systems to the shell design of the screen-reflector in the prototype is not even theoretically considered.

And the last remark. In this formulation of the cylindrical screen-reflector (with any kind of guides forming a straight line) can have more than one focal point and limit - focal line, as provided in our invention.

Thus, when using this device, the energy efficiency, reflected, and possibly increase, but only slightly.

We were set a task to develop a highly effective device for extinguishing forest fires.

This goal is achieved by a device for extinguishing forest fires reflected waves directed blasts that contains the screen-reflector made by elastic bending of the longitudinal force initially flat sheet of rectangular shape, and an explosive charge, a point or wire, placed in a pre-calculated focal point in front of the screen-reflector according to the invention, the screen-reflector attached to the independently made the frame containing adjustable cantilever elements at this point or corded explosive charge placed on the console frame elements in/on the focal point/line, and the screen-reflector is designed as a package from the t with elastic guide supports longitudinal loads, operating in the direction of the length or width of the screen-reflector, and using transverse elastic of nagrujala acting across the same size, and transverse elastic narwhale contain thrust, one ends pivotally connected to the rigid transverse edges of the screen-reflector, and the other ends are attached by springs, pressure washers and nuts with lock nuts to the frame.

The drawing schematically shows a device for extinguishing forest fires. It contains independently made the frame 1. On the frame, adjustable cantilever elements 2 placed in a point or wire explosive charge 3/focal point/line F. the Screen-reflector 4 (with foci on line (F) executed as a batch elastic multilayer initially flat rectangular plates 5 and attached to the frame 1. The package 5 is elastically bent by means of elastic guides the longitudinal load supports 6 acting in the direction of one of the characteristic dimensions of the screen-reflector 4 (length or width), and using transverse elastic of nagrujala 7 operating across the same characteristic dimension; and transverse narwhale 7 contain thrust 8, one ends pivotally connected to the rigid transverse ribs 9 screen-reflector 4, and the other, the formation of the screen-reflector 4 is complete when the installation of the device by simultaneous exposure to screen-reflector longitudinal forces from the elastic guides the longitudinal load supports 6, uniformly distributed on a different characteristic size on the frame 1, and when the elastic bending of the package transverse forces from the transverse elastic of nagrujala 7 operating so that the screen-reflector 4, with prescribed accuracy of the approximation may have a cylindrical shape with any type of guide to forming a straight line. Thus, by varying the number of elastic guides the longitudinal load supports 6, the corresponding number of transverse elastic nagrujala 7, the rigidity characteristics of the springs and the Flexural rigidity of the layers of the package, you can zoom in view of the reflective surface of the screen-reflector to the desired sinusoidal form of a cylinder (with a focus in/on the dot/line F).

Using adjustable cantilever elements 2 is the placement of the explosive charge it in/on the focal point/line F.

The device operates as follows. During the blasting EXPLOSIVES blast wave from a point or cord charge, having a spherical or cylindrical shape, partially moves in the direction of the front of a forest fire. Another E. the situation of the movement of the first part of the blast wave and increases its activity [3]. Thus, the effectiveness of the extinguishing of forest fires increases due to more fully utilize the energy of explosion of the explosive.

Use as a reflective screen laminated elastic plates (shells) makes it possible to increase the strength of the screen-reflector. For him, the calculated estimated allowable stress strength under impact loading by the blast. This allows you to choose the suitable materials for the various layers of the package screen-reflector, and to set the necessary number of layers, their thickness, Flexural rigidity and optimal mutual arrangement. Then all of this is coordinated with the safe location of the explosive charge on line tricks F.

For theoretical calculations of these parameters is used theory of multi-layer (I is the number of layers) of plates and shells of the first order [5]. During this movement of the reflective surface of the screen-reflector is written in the form:

wi=w0;i-1zi;

The equations of motion m and have the form:

Here- vector whose components are the desired functions:

[] and [] symmetric matrix of dimension (2I+3)((2I+3);

Q is the vector of external forces.

External load is modeled by a particular law, or in the form of the Heaviside function, or a function of the Dirac or dependence [2].

The work is at the stage of development of design documentation.

Literature

1. A. S. No. 1644976 (USSR)/A. M. Grishin, N. A. Alekseev, A. N. Golovanov. Method of extinguishing forest fires. No. 400619, class. And 62 1/22, 1988.

2. Reva, Century, Kutsenko L. M. Method once intensivnost d udarna hwil directed the Bang for Genna lavich pages. - Kharkiv: HPB MVS Okra neither, 1998. - 80 S.

3. Reva, Century, Tenchijin Y. N. Reflector for extinguishing forest fires shock waves directed blasts//proc. the Intern. scientific-practical. conference "Modern problems of geometric modeling". - Donetsk, 2000. - 87-89 C.

4. Belyaev N. M. Strength of materials. - M.: State publishing house of technical and theoretical literature, 1953. - 856 S.

5. Chepikov A. N., Dolgopolov N. In. Vibrations of a multilayer cylindric-top:2mm;">Claims

Device for extinguishing forest fires reflected waves directed blasts that contains the screen-reflector made by elastic bending of the longitudinal force initially flat sheet of rectangular shape, and an explosive charge, a point or wire, placed in a pre-calculated focal point in front of the screen-reflector, characterized in that the screen-reflector attached to the independently made the frame containing adjustable cantilever elements at this point or corded explosive charge placed on the console frame elements in/on the focal point/line and screen-reflector is designed as a package of elastic multilayer initially flat rectangular plates, attached to the frame and elastically bent with elastic guide supports axial loads acting in the direction of the length or width of the screen-reflector, and using transverse elastic of nagrujala acting across the same size, and transverse elastic narwhale contain thrust, one ends pivotally connected to the rigid transverse edges of the screen-reflector, and the other ends are attached by springs, pressure washers and g

 

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