RU2364554C1 - Helicopter external load sling system - Google Patents

Abstract

FIELD: aircraft engineering.

SUBSTANCE: invention relates to helicopter external load sling systems. Proposed system comprises at least three radial beams (1) fastened to helicopter fuselage bottom (2). Aforesaid beams have eyes (3) to sling ropes (4) of the system. Lower end of the said ropes are furnished with grippers (5) clipped to hoisting members (6) basket (7) accommodating cargo (8).

EFFECT: elimination of cargo rocking at all flight conditions.

3 dwg

Description

The invention relates to the equipment of helicopters and can be used for the safe transportation of goods that cannot be dropped from a helicopter if they are swaying from a strong wind or if necessary, fly at high speed, for example, when transporting radioisotope generators for automatic beacons in case of flight with them over the sea, during transportation of valuable goods, during the installation of various equipment and building structures, as well as if urgent delivery is required Ruzov.

A device for transporting goods on the external suspension of helicopters designed by M. Mil, which is a cable, the upper end of which is fixed to the fuselage of this helicopter, and the lower end is equipped with a sling unit for hanging the transported cargo [1].

This device, as shown by the practice of helicopter transport, can be used at a speed of 80-100 km / h according to the instrument, depending on the shape of the load, since at high speeds the loads swing, this swinging is transmitted to the helicopter in the form of jerks and threatens the helicopter with catastrophe, in view of why the cargo in these cases, as well as when flying at a high wind speed, had to be dumped. In addition, the swinging of the load complicates the piloting of the helicopter using the control levers.

A device for transporting goods on the external suspension of a S-56 helicopter designed by I.I. Sikorsky, adopted as a prototype, which includes several suspension cables, the upper ends of which are spaced from each other and mounted on the fuselage of the helicopter, and their lower ends are connected with sling unit, used for fastening several slings carrying a transported cargo [2].

The disadvantage of this device is the small distance between the attachment points of the upper ends of the suspension cables on the fuselage of the helicopter, which is limited by the size of the latter, as well as the small angle between each suspension cable and the vertical, due to which it can swing. In addition, the center of gravity of the load is located on the vertical passing through the sling unit, and the point of application to the load of full aerodynamic force is located at a great distance from the sling unit, which also creates conditions for the load to swing. The swinging of the load, as in the helicopters designed by M.L. Mil, complicates the piloting of the helicopter with the help of control levers, as well as the installation of equipment and building structures. In addition, at a high speed of flight or flight at a high speed of wind, the load can also swing strongly, and this swing is transmitted to the helicopter in the form of jerks and threatens the helicopter with catastrophe, which is why in such situations the cargo has to be dumped.

The objective of the invention is to eliminate the buildup of cargo during transportation on the external suspension of the helicopter at all permissible flight conditions of the latter and the installation of various equipment and building structures, increasing the safety of such operations and facilitating piloting of the helicopter using the control levers, in addition, increasing the permissible flight speed and permissible wind speed when transporting goods by external helicopter by helicopter.

This problem is solved by the fact that at least three radially oriented beams are fixed on the bottom of the fuselage of the helicopter, on which, in turn, the upper ends of the corresponding suspension cables are fixed, and the cargo is fixed in a basket, the gripping bodies on the lower ends of these cables are hooked to the lifting nodes the suspension, or the load is directly sprinkled behind its rigging units using gripping bodies at the lower ends of the respective suspension cables. Moreover, for all permissible flight modes of the helicopter, the angle of inclination to the vertical of the vector of the sum of the total aerodynamic force and other external forces, as well as the force of the weight acting on the transported objects, respectively, on the basket without cargo, the basket with the cargo fixed in it or the cargo, which is sprinkled directly behind its rigging nodes falling on one of their rigging nodes located on the side of application of the mentioned external forces, and through the sling point of which passes a plane on which lies the sum vector of all corresponding constituents above the forces acting on the rigging assembly is less than or equal to the angle of inclination to the vertical of the corresponding suspension rope whose axis lies on said plane.

A comparative analysis of the claimed solutions and the prototype shows the presence of the following new distinctive features characterizing the level of invention:

- at least three radially oriented beams are fixed on the bottom of the helicopter fuselage, on which, in turn, the upper ends of the respective suspension cables are fixed, and the load is fixed in a basket, the gripping bodies on the lower ends of these suspension cables are hooked to the lifting nodes it is cropped for its rigging nodes with the help of gripping bodies at the lower ends of the corresponding suspension cables, which makes it possible to sling transported objects to ensure a significant angle between each cable under Eski and vertical, and to create the necessary conditions to prevent the buildup of object to be conveyed at high speed helicopter flight and a large wind speed;

- for all acceptable flight modes of the helicopter, the angle of inclination to the vertical of the vector of the sum of the total aerodynamic force and other external forces, as well as the force of the weight acting on the transported objects, respectively, on the basket without cargo, the basket with the cargo secured in it or the cargo, which is sprinkled directly behind its rigging nodes falling on one of their rigging nodes located on the side of application of the mentioned external forces and through the sling point of which passes a plane on which lies the vector of the sum of all corresponding the aforementioned forces acting on this rigging unit is less than or equal to the angle of inclination to the vertical of the corresponding suspension cable, whose axis lies on the said plane, which is also a necessary condition to prevent the transported object from swaying under all permissible helicopter flight modes and to facilitate helicopter piloting using levers control, as well as to ensure the safety of work carried out with goods on the external suspension of helicopters.

These new distinguishing features and the technical result achieved in this way allow us to consider the proposed design of the device for transporting goods on the external suspension of helicopters corresponding to the inventive step.

Figure 1 shows a device for transporting goods on the external suspension of helicopters with cargo fixed in a basket. Figure 2 shows View A of this device (the helicopter is not conventionally shown, and radially oriented beams mounted on the bottom of the fuselage of the helicopter are made with a broken axis in order to ensure that the racks do not touch the landing gears of helicopters of common designs). Figure 3 shows the same device with cargo transported without a basket.

The proposed device for transporting goods on an external sling contains radially oriented beams 1, mounted on the bottom of the fuselage of the helicopter 2, on which the eyes 3 are mounted, the cables 4 of the suspension are suspended on them, the lower ends of which are equipped with gripping bodies 5, hooked to the lifting units 6 of the basket 7, carrying the load 8. When transporting goods without a basket, the latter is slid for the rigging nodes 9 using gripping bodies 5 at the lower ends of the suspension cables 4.

A device for transporting goods on the external suspension of helicopters is operated as follows. In the presence of a standard basket and standard suspension cables, the weight of the cargo intended for transportation, its maximum dimensions and maximum cross-sectional area, as well as the lateral surface area of the cargo in the transverse direction, the approximate position of its center of gravity and some other characteristics are first established, and then these characteristics are compared with the calculated data in a special table compiled during the design and testing of the external suspension, as a result, the possibility of trans porting cargo on a standard helicopter suspension. When transporting a basket without cargo, a basket with cargo fixed in it, or cargo without a basket, the transported objects are affected by the full aerodynamic force and other external forces, as well as the force of their weight. In this case, the angle of inclination to the vertical of the vector of the sum of external forces acting on the transported objects under all permissible helicopter flight conditions and the weight of the transported objects falling on one of their rigging units located on the application side of the mentioned external forces and through which the plane passes through the sling point which lies the vector of the sum of all the above forces acting on this rigging unit, is equal to the angle of inclination to the vertical of the corresponding suspension cable, the axis of which lies on the said plane, and ezultiruyuschaya all these forces is directed along the suspension cable or the resultant of this is directed at a smaller angle to the vertical than said suspension cable. As a result, transported objects will not swing under all permissible helicopter flight modes.

Information sources

1. The journal "Technology - Youth", No. 10, 1991, p. 2, p. 4.

2. The journal "Technology - Youth", No. 7, 1989, p. 44.

Claims (1)

A device for transporting goods on the external suspension of helicopters, containing several suspension cables, the upper ends of which are spaced from each other, characterized in that at least three radially oriented beams are fixed on the bottom of the helicopter fuselage, on which, in turn, the upper ends of the corresponding cables are fixed suspension, and the load is secured in a basket, for the lifting nodes of which the gripping bodies are hooked at the lower ends of these suspension cables, or the cargo is directly sprinkled for its lifting nodes with grasping bodies at the lower ends of the respective suspension cables, and for all permissible helicopter flight modes, the angle of inclination to the vertical of the vector of the sum of the total aerodynamic force and other external forces, as well as the weight force acting on the transported objects, respectively, on a basket without cargo, a basket with fixed it with cargo or with cargo sprinkled directly behind its rigging units, falling on one of their rigging unit located on the side of application of the mentioned external forces, and through the sling point which about passes a plane on which lies the sum vector of all the corresponding above-mentioned forces acting on this rigging unit, less than or equal to the angle of inclination to the vertical of the corresponding suspension cable, the axis of which lies on the said plane.

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