RU2611446C1 - Stand for helicopter ground tests - Google Patents

Abstract

FIELD: aviation.

SUBSTANCE: invention relates to a test engineering for carring out system testing complex, includes a helicopter. The stand for helicopter ground tests contains fixed reinforced concrete foundation (1) with two supporting trusses (2), installed parallelly to each other, and inboard fuselage load frame (3). The supporting trusses (2) are rigidly fixed at the base (1) and are connected between each other by means of connecting beams. The inboard fuselage load frame (3) is made from the top (12) and bottom (13) sheets, performing the function of the power belts, fastened between each other by diaphragms (14). The frame (3), by means of the fastening units (16), is rigidly fixed from below to the standard cargo lashing points (17), located at the helicopter's floor. Through the fuselage (11) window apertures (10) of the helicopter, the upper transverse beams (7) are fixed on the top plate (12) of the frame (3). The beams (7) are attached to the top of the trusses (2).

EFFECT: invention provides the ability to create the loads to all elements of the transmission and control system for the field tests of the helicopter.

3 cl, 6 dwg

Description

The invention relates to the field of aircraft manufacturing, namely to testing equipment, and is intended to carry out a set of tests, including research, certification, and can be used to test a propeller drive system (transmission) and control system elements in a helicopter.

A device for conducting flight tests of helicopters (CN 103895873, B64F 5/00, publication 02.07.2014), in which the helicopter hangs above the ground, held by a cable. The device includes rods installed in the ground, to which a horizontal cable is attached with the possibility of its tension up to 10-15 degrees to the surface of the earth. An external power frame with a helicopter placed on it is fixed to a horizontal cable with a vertical cable, the length of which regulates the height of the helicopter above the ground.

The disadvantages of this device is the low reliability, as well as a narrow list of possible tests.

A device is known for mounting a helicopter when tested in wind tunnels (copyright certificate No. 290191, G01M 9/04, priority July 1, 1969), in which a rigid frame placed inside the fuselage of the test object is attached to the racks of the upper structure of the wind tunnel weights using two side and one rear brackets that end with spherical articulated bearings. Forks are provided on top of the brackets for pivotally mounting three dampers-dampers that perceive the longitudinal and transverse vibrations of the object.

The disadvantage of this device is the low reliability due to the large number of articulated components.

A device is known for lifting helicopters during repair work (EP 2338794, B64F 5/00, publication 06/29/2011), which includes a supporting structure with an installed lift and height-adjustable support racks connected by a crossbar. A reinforcing frame is placed inside the helicopter fuselage, the beams of which can be placed either vertically from the floor to the roof, or along the diagonal directions of the fuselage. The lifting device is connected to the reinforcing frame through the crossbar, which allows you to evenly distribute the emerging stresses.

This device has limited capabilities in accordance with the function of the lift.

A device is also known that is closest to the claimed technical solution, designed to dock the fuselage with the wing of a heavy aircraft (copyright certificate No. 272067, B64F 5/00, publication 05/26/1970). This device contains two racks mounted on a trolley with longitudinally mounted rails. The rails move the carriages of the transverse beams, which pass through the windows made in the fuselage of the aircraft and are mounted inside the latter on a false intra-fuselage frame.

The disadvantages of this device are low reliability and limited capabilities in accordance with the function of docking the wing of the aircraft with the fuselage.

The aim of the invention is to create a stand with the possibility of fixing the helicopter in a stationary state for conducting ground field tests of helicopter systems with the transfer of loads from the fuselage to the structure and base of the stand; the ability to simulate the transfer of loads during a helicopter flight with cargo placed on the floor; increase the reliability of the stand.

The goals are achieved due to the fact that in the stand for conducting ground tests of a helicopter containing a base with support trusses installed on it, removable upper cross beams placed through window openings in the fuselage of the helicopter, and the fuselage frame, in accordance with the claimed invention, are rigidly mounted on a fixed the base of the truss is fixed to each other by means of the upper transverse beams, which are equipped with mounts to the trusses and mounts to the inside frame and are designed for their horizontal placement through the window openings in the fuselage, and the fuselage frame is made of upper and lower sheets that perform the function of power belts fastened together by diaphragms, and on the top sheet there are attachment points for connecting to the transverse beams, and the bottom sheet is equipped with attachment points to regular load securing units located on the helicopter floor.

In addition, the trusses are fixed on a fixed base with anchor bolts and plates. Also, the trusses are fixed to each other using stationary connecting lower beams.

Rigid installation of supporting trusses on a fixed base, fixing the trusses with each other by means of upper cross beams, which are equipped with mounts to trusses and mounts to the inside frame, making inside frames from the top and bottom sheets fastened together by diaphragms, as well as the presence on the top sheet attachment points for connection to the upper transverse beams, and on the bottom sheet of attachment points to the standard load attachment points located on the helicopter floor, are intended for installation of a helicopter that in a stationary state for the purpose of carrying out full-scale testing ground helicopter systems to the implementation of the transfer of loads from the fuselage on the design of the stand and the base, thereby increasing the reliability of the stand, as well as simulate the transfer of loads during flight helicopter stationed on the floor of the cargo.

The device stand for ground testing of the helicopter is illustrated by drawings, which depict:

in FIG. 1 - stand, side view.

In FIG. 2 is a section DD of FIG. 1, stand, front view.

In FIG. 3 - stand with a mounted helicopter, side view.

In FIG. 4 - stand with a mounted helicopter, front view.

In FIG. 5 is a view D of FIG. 4, stand, top view.

In FIG. 6 is a partial view Ε of FIG. 4, fixing the inside frame to the cargo floor of the helicopter.

The test bench for ground testing of the helicopter contains (Fig. 1) a fixed reinforced concrete base 1 with two support trusses 2 mounted parallel to each other, and an intra-fuselage power frame 3. Truss 2, rigidly fixed to the base 1, for example, using anchor bolts 4 and plates 5 are interconnected by means of connecting welded beams 6 and 7 of box section. Moreover, the lower beams 6 are stationary, and the upper transverse beams 7 are removable (Fig. 2) and are located in the horizontal plane.

The upper transverse beams 7, equipped with attachment points 8 to the trusses 2 and attachment points 9 to the fuselage frame 3, are designed for their placement through the window openings 10 of the fuselage 11 of the helicopter and subsequent rigid attachment to the trusses 2 (Fig. 3, 4, 5).

The intra-body power frame 3 (Fig. 1, 2) is a box-shaped structure consisting of upper 12 and lower 13 metal sheets that perform the function of power belts fastened together to give rigidity to the diaphragms 14, in which openings 15 are made for access to the inner part frames 3. Moreover, the top sheet 12 contains welded fasteners (for example, plates, not shown) for detachable connection with the transverse beams 7, and the bottom sheet 13 is equipped with fasteners 16 to the standard nodes 17 of the load securing, located on the helicopter, for example, to its load-bearing frames (Figs. 2, 6).

The installation of the stand and the installation of the test helicopter is as follows.

On a reinforced concrete base 1, support trusses 2 are installed using anchor bolts 4 and plates 5, connecting them using stationary lower beams 6.

Previously, outside the booth, in the fuselage 11 of the helicopter, through the open rear cargo doors (not shown), an intra-fuselage power frame 3 is placed. Then, the frame 3 is fastened to the regular load securing nodes 17 located on the helicopter’s floor, via attachment points 16 from below, for example, to its power frames .

In the window openings 10 of the fuselage 11 of the helicopter, removable upper transverse beams are placed 7. Then they are fixed on the top sheet 12 of the frame 3 using the attachment points 9.

Next, the test helicopter with the power frame 3 and the beams 7 fixed inside is lifted by the rotor shaft using lifting equipment, such as a crane, and placed between the trusses 2. After that, the beams 7 are attached to the upper part of the trusses 2 via attachment points 8, for example, using bolts and nuts (Fig. 4).

Thus, the helicopter is fixedly mounted in the stand structures and is ready for ground tests of its systems at any engine operating conditions. Since the helicopter touches the stand structures only in the area of the cargo floor, it turns out to be fixed to the floor on the reinforced concrete base of 1 stand. At the same time, the power set of the stand forms a spatial structure that allows you to connect the cargo floor of the helicopter with the reinforced concrete base of 1 stand.

Stand for ground testing of the helicopter operates as follows.

After installing the helicopter in the stand, the pilot turns on the engine and begins to control the helicopter systems in accordance with the test program.

During the rotation of the rotor, a vertical lifting force is generated, which presses the helicopter with the floor to the power frame 3.

This creates a load on the rotor shaft of the main gearbox (not shown) by loading forces, bending and torques that are transmitted to the fuselage 11, and the torque is parried completely or partially by the tail rotor (not shown) of the helicopter, depending on the test program. Load stresses and moments are perceived by the frame 3 and then through the upper transverse beams 7 and stand farms 2 are transferred to the base 1.

As a result of using the stand, a load is created on all elements of the transmission and helicopter control systems in order to conduct their ground field tests, including in accordance with the requirements of the Certification basis.

Dismantling the device occurs in the reverse order.

Claims (3)

1. A stand for conducting ground tests of a helicopter, comprising a base with supporting trusses installed on it, removable upper transverse beams placed through window openings in the fuselage of the helicopter, and an intra-frame frame, characterized in that the trusses rigidly mounted on a fixed base are fixed to each other by upper transverse beams, which are equipped with attachment points to trusses and attachment points to the fuselage frame and are designed for horizontal placement through window openings in the fuselage, and trifyuzelyazhnaya frame formed of upper and lower sheets of performing the function of power belts, diaphragms bonded together, wherein arranged on the top sheet attachment points for connection with the transverse beams, and the bottom sheet is provided with fixing units to regular nodes lashing arranged on the floor of the helicopter. 2. The stand according to claim 1, characterized in that the trusses are fixed on a fixed base with anchor bolts and plates. 3. The stand according to claim 1, characterized in that the trusses are fixed to each other using stationary connecting lower beams.

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