RU2773301C1 - Installation of duplicated steering actuators on the hydraulic actuator - Google Patents

Abstract

FIELD: aircraft control system.

SUBSTANCE: invention relates to an aircraft control system. The hydromechanical control system contains hydraulic boosters (1), steering actuators (7, 8) with rods, mechanical control wiring. The steering actuators (7, 8) are installed parallel to the mechanical control wiring. Each hydraulic booster (1) has two steering actuators (7, 8) fixed in series or connected to each other by means of a supporting rocker (6). The first actuator is connected to the main automatic control system. The second actuator is connected to the redundant stability improvement system. The axis of rotation of the rocking chair, on which the support of the flexible control rod is located, coincides with the axis of rotation of the hydraulic booster in the bracket of its hinged mount.

EFFECT: enabling the use of an automatic control system with flight modes when the pilot is not in the control loop.

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Description

SUBSTANCE: invention relates to the field of combined aircraft control systems and can be used in control systems with flexible rods for installing duplicated steering actuators of an automatic control system directly on hydromechanical steering gears.

Known hydromechanical control system of the main rotor, installed on the Mi-38 helicopter, containing: three hydraulic boosters that control the position of the swashplate, mechanical wiring of the longitudinal-transverse control of rigid rods and rocking chairs, in which twin steering actuators of the stability improvement system are installed. Steering actuators IRMD-1, installed in series in the control wiring, by moving their rods according to the signals of the stability improvement system, correct the displacements of the control wiring specified by moving the control lever by the pilot (Mi-38-2 helicopter. Technical operation manual. 4.2. Longitudinal-transverse control - description and work, 065.41.00, p. 1, 03.02.2014).

The disadvantage of this technical solution is the placement of the steering actuators not on the hydraulic booster, but on the previous link in the chain of mechanical control wiring, which, during the operation of the stability improvement system, increases the likelihood of the return of the movements of the steering actuator rods to the control lever instead of the movement of the hydraulic booster spool. The dimensions of the twin steering actuators IRMD-1, when placed in series in the mechanical control wiring, do not allow them to be placed as close as possible to the hydraulic booster spool to prevent kickback into the control lever.

Known hydromechanical control system containing hydraulic boosters located on three sides of the swashplate, steering actuators with rods, mechanical control wiring, consisting of rods and rockers, while the steering actuators are installed parallel to the mechanical control wiring, made using flexible rods, with the ability to control the position of the supports of the shells of flexible rods (Patent RU 2636195 C2. Installing the steering actuator on a hydraulic drive. - IPC: B64C 13/42, B64C 13/40). This analog is taken as a prototype.

When installing only one non-redundant steering actuator on each hydraulic booster in automatic flight modes, when the pilot is outside the control loop, it is impossible to ensure the safety of the helicopter flight in case of failure of the automatic control system, including the failure of the steering actuator itself.

With a fixed control wiring and a fixed rod of the steering actuator, the rotation of the hydraulic booster in the bracket of its hinged mount causes a change in the position of its output link, which introduces an error in the control of the hydraulic booster (Fig. 3).

The objective of the invention is to provide the possibility of using an automatic control system with flight modes when the pilot is not in the control loop, by installing duplicated steering actuators on the hydraulic booster and eliminating the effect of changing the angular position of the hydraulic booster on the position of its output link.

The problem is solved due to the fact that in a hydromechanical control system containing hydraulic boosters located on three sides of the swashplate, steering actuators with rods, mechanical control wiring, consisting of rods and rocking chairs, while the steering actuators are installed parallel to the mechanical control wiring, made with the use of flexible rods, with the ability to control the position of the supports of the shells of the flexible rods, each hydraulic booster is equipped with two steering actuators connected in series to each other or connected to each other by means of a supporting rocker, one of which is connected to the main automatic control system, and the second - to the reserve system for improving stability, while the axis of rotation of the rocking chair, on which the support of the flexible control rod is located, coincides with the axis of rotation of the hydraulic booster in the bracket of its hinged mount.

In FIG. 1 shows a diagram of the installation of redundant SEMA 8493 steering actuators, where it is indicated:

1. hydraulic booster RP-14;

2. flexible control rod;

3. rocking chair;

4. hard traction;

5. two-shoulder rocking chair;

6. supporting rocker;

7. steering actuator SEMA 8493;

8. steering actuator SEMA 8493;

9. hydraulic booster input link;

10. hydraulic booster output link;

11. hydraulic booster swivel bracket.

The hydraulic booster 1 RP-14, the output link 10 of which controls the position of the helicopter swashplate (the swashplate is conventionally not shown), is pivotally mounted in its mounting bracket 11.

Rocker 3 is hinged on bracket 11 in such a way that the axis of rotation of rocker 3 coincides with the axis of rotation of hydraulic booster 1.

The flexible control rod 2 is connected at one end to the input link 9 of the hydraulic booster 1, and the shell support is fixed to the rocker 3, which is connected by means of a rigid rod 4 to the two-arm rocker 5, pivotally mounted on the body of the hydraulic booster 1.

On the hydraulic booster 1 RP-14, in parallel with the mechanical control wiring, two steering actuators 7 and 8 SEMA 8493 are installed, connected in series with each other (both rigid fixed connection (Fig. 2) and through a supporting rocker 6 (Fig. 1) are possible) . The upper tip of the steering actuator 7 is connected to the body of the hydraulic booster 1, and the lower tip of the steering actuator 8 is connected to the two-arm rocker 5, while one of the steering actuators is connected to the main automatic control system, and the other to the backup stability improvement system.

The steering actuator mounted on a hydraulic drive operates as follows.

In the automatic control mode, upon receiving a signal from the main automatic control system, the steering actuator 8 SEMA 8493 through a two-arm rocker 5, a rigid rod 4 and a rocker 3 with a flexible control rod support 2 pivotally mounted on it, changing its position, moves the input link 9 hydraulic booster 1, causing the movement of its output link 10. The movement of the flexible control rod 2, set by the steering actuator 8 SEMA 8493, occurs without changing the output value of its rod.

In the event of a failure of the main automatic control system, the backup system for improving stability sends signals to the steering actuator 7 SEMA 8493, which, through the supporting rocker 6, the passively movable steering actuator 8 SEMA 8493, the two-arm rocker 5, the rigid link 4, changes the position of the rocker 3 with a hinged the support of the flexible control rod 2 installed on it. The flexible control rod 2 changes its position without changing the value of the output of its rod, moves the input link 9 of the hydraulic booster 1 RP-14, causing the movement of its output link 10.

In the manual control mode (the main automatic control system and the backup system for improving stability are completely turned off, the steering actuators do not work), the rod of the flexible control rod 2 moves with the input link 9 of the hydraulic booster 1 RP-14, with the rocker 3 stationary.

At any position of the rods of the steering actuators, the rotation of the hydraulic booster relative to the axis of its hinged mount leads to the rotation of the SEMA 8493 7 and 8 steering actuators installed on the hydraulic booster, the supporting rocker 6 and the two-arm rocker 5 with rigid traction 4 relative to the same axis by the same angle turn. Due to the fact that the axis of rotation of the rocker 3 coincides with the axis of rotation of the hydraulic booster RP-14, the rigid rod 4 turns the rocker 3 at the same angle that the hydraulic booster 1 rotates. the position of the rod of the flexible control rod relative to its shell, the input link of the hydraulic booster 9 does not change its position relative to the body, and the output link of the hydraulic booster 10 remains stationary relative to the body. As a result, there is no change in the position of the output link of the hydraulic booster when it is rotated in the mounting bracket 11.

This invention allows:

- install two steering actuators on each hydraulic booster, one of which is connected to the main automatic control system, and the second - to the backup stability improvement system;

- to ensure the use of the automatic control system with flight modes in which the pilot is not in the control loop, due to the possibility of putting into operation backup steering actuators connected to the backup system for improving stability;

- retain the ability to control the hydraulic booster by changing the position of the support of the shell of the flexible rod for controlling any of the two steering actuators;

- ensure independence of the position of the output link of the hydraulic booster from the rotation of the hydraulic booster in the bracket of its hinged fastening.

Claims (1)

Hydromechanical control system containing hydraulic boosters located on three sides of the swashplate, steering actuators with rods, mechanical control wiring, consisting of rods and rockers, while the steering actuators are installed parallel to the mechanical control wiring, made using flexible rods, with the possibility for controlling the position of the supports of the shells of flexible rods, characterized in that each hydraulic booster has two steering actuators connected in series, fixed to each other or connected to each other by means of a supporting rocker, one of which is connected to the main automatic control system, and the second to the backup improvement system stability, while the axis of rotation of the rocking chair, on which the support of the flexible control rod is located, coincides with the axis of rotation of the hydraulic booster in the bracket of its hinged mount.

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