An aircraft engine thrust reverser simulation test bench

Abstract

The present invention relates to a simulation test bench for an aircraft engine reverse thrust device, which includes a bottom plate, gantry columns, a gantry cross beam, a hoisting cross beam, a connecting frame, an inner duct, a C-shaped movable outer cover, a synchronous actuator, an actuator support plate, a hydraulic cylinder, a choke door, and a tie rod assembly. The main purpose of the present invention is to study the dynamic effects of the choke doors in various directions in the reverse thrust device mechanism of the current new type of engine on the opening and closing processes of the movable outer cover under different loads, as well as the jamming problems caused by factors such as guide rail clearances and friction to the reverse thrust mechanism, so as to provide a simplified, new type of adjustable simulation test bench for the reverse thrust device. This test bench changes the loading method of the load force, changes the direction of the load force through the fixed pulley principle, and then uses a hydraulic cylinder for loading, and can study the dynamic effects of the choke doors at any position on the overall mechanism and the changes in the friction characteristics at the guide rails under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engines, and particularly to a simulation test bench for an aero-engine reverse thrust device. Background Art

[0002] An aero-engine reverse thrust device refers to a device that changes the direction of the engine thrust, which is mostly used after the aircraft touches the ground to reduce the aircraft speed and shorten the landing roll distance. Since the reverse thrust device is not restricted by weather conditions such as rain and snow, has good braking effect and high safety factor, it is widely used in turbojet and turbofan engines of civil and military transport aircraft and civil airliners. The reverse thrust device has characteristics such as large part size and many thin-walled parts, so problems such as local jamming and slow mechanism response speed will occur during the movement process. This test bench is mainly designed for the related problems of the cascade reverse thrust device.

[0003] In the existing research on test benches for reverse thrust devices, a test bench for an engine reverse thrust device disclosed in Chinese Patent CN 202255879 U mainly consists of a fan, an assembly vehicle frame, an adapter section and an air flow channel, and is used to detect whether the main data of the reverse thrust device meet the installation requirements. This reverse thrust device test bench mainly applies pneumatic load to the reverse thrust test bench through a wind pressure supply device, and at the same time detects the movement stability of the reverse thrust mechanism during the opening and closing processes and the opening and closing times of the reverse thrust door. For the load application device of this test bench, it mainly consists of a fan blade and a motor. Since the pneumatic load received by the engine reverse thrust device is relatively large in actual situations, it is relatively difficult to simulate using a fan blade, and the air flow loading has high requirements for the sealing performance of the experimental device; in addition, this test bench lacks research on the movement law of the choke door mechanism; there is no in-depth research on the moving outer cover guide rail, and there is a lack of analysis of the influence of the change in the friction characteristics at the guide rail on the jamming problem of the reverse thrust device.

[0004] The paper "Development and Verification of a Reverse Thrust Device Model Test Bench" introduces a model test bench for a turbofan engine reverse thrust device. This test bench mainly consists of an intake system, a sealing and heating system, an exhaust system, a fuel system, an electrical system, a measurement and control system, a force measurement system, a cooling air system, a cooling water system, etc., and can be used for basic tests of components such as aero-engine reverse thrust devices, functional nozzles, and exhaust devices. This turbofan engine reverse thrust device model test bench has a relatively complete intake, exhaust system, fuel system, and measurement and control system, and conducts test and measurement on components such as aero-engine reverse thrust devices, functional nozzles, and exhaust devices. This test bench mainly tests the overall functional system of the reverse thrust device, is not very suitable for the dynamic analysis of each component in the reverse thrust mechanism, and this test bench has a complex structure and a high manufacturing cost. Summary of the Invention

[0005] In view of the above problems, the object of the present invention is to provide a simulation test bench for an aero-engine reverse thrust device. This test bench changes the loading method of the load force, changes the direction of the load force through the principle of a fixed pulley, and then uses a hydraulic cylinder for loading, so as to study the dynamic effects of the choke doors at any position on the overall mechanism and the change of friction characteristics at the guide rail under different working conditions.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A simulation test bench for an aero-engine reverse thrust device proposed by the present invention includes a bottom plate, gantry columns, a gantry cross beam, a lifting cross beam, a connecting frame, an inner duct, a C-shaped movable outer cover, a synchronous actuator, an actuator support plate, a hydraulic cylinder, a choke door, and a tie rod assembly; the gantry columns are respectively vertically arranged at the four corners of the upper surface of the bottom plate; the gantry cross beams are respectively arranged between the tops of the front and rear two gantry columns on the left side and between the tops of the front and rear two gantry columns on the right side; the lifting cross beam is arranged between the middle parts of the upper end faces of the two gantry cross beams on both sides; the hydraulic cylinder is vertically fixed under one end of the lifting cross beam; the connecting frame is horizontally fixedly connected below the middle area of the lifting cross beam; the inner duct is fixedly connected to the lower end of the connecting frame; the C-shaped movable outer cover is symmetrically arranged on the left and right sides of the inner duct, and the upper and lower ends of its open side are respectively movably matched with the upper and lower ends of the inner duct; the actuator support plate is arranged between the upper and lower parts of the front and rear two gantry columns on the right side; the synchronous actuators are respectively symmetrically arranged on the upper and lower sides of the C-shaped movable outer cover, one end of which is connected to the C-shaped movable outer cover by a spherical pair, and the other end is connected to the actuator support plate by a spherical pair; the choke door is arranged inside the C-shaped movable outer cover; the choke door is connected to the inner duct and the C-shaped movable outer cover through a tie rod assembly.

[0008] Further, T-shaped grooves are respectively arranged at the upper and lower ends of the inner duct, and six inner duct hinge supports are vertically and evenly distributed on the right sides of the front and rear end faces of the inner duct for connecting the tie rod assembly; the upper and lower ends of the C-shaped movable outer cover are respectively movably matched with the T-shaped grooves at the upper and lower ends of the inner duct.

[0009] Further, bushings are installed inside the T-shaped grooves for studying the friction characteristics of the guide rails.

[0010] Further, the C-shaped movable outer cover is composed of two semi-circular flanges and a cylindrical steel plate connected between the inner circumferences of the two semi-circular flanges.

[0011] Further, T-shaped guide rails movably matched with the T-shaped grooves are respectively arranged at the upper and lower ends of the open side of the semi-circular flange.

[0012] Furthermore, on the upper and lower parts of the right end face of the semi-circular flange on the side far from the actuating cylinder support plate, actuating cylinder hinge supports are respectively arranged; on the upper and lower parts of the semi-circular flange on the side close to the actuating cylinder support plate, rectangular grooves are arranged at positions corresponding to the actuating cylinder; one end of the synchronous actuating cylinder is connected to the actuating cylinder hinge support through a spherical pair, and the other end passes through the rectangular groove and is connected to the actuating cylinder support plate through a spherical pair; on the inner circumferential end face of the semi-circular flange, outer duct hinge supports and direction pull rod hinge supports with the same orientation are evenly distributed respectively, for connecting the choke valve and the pull rod assembly.

[0013] Furthermore, the pull rod assembly includes a direction pull rod, a choke valve mounting support, a choke valve pull rod, a connecting rod and a small pull rod; one end of the direction pull rod is hinged to the direction pull rod hinge support, and the other end is hinged to one end of the connecting rod; the other end of the connecting rod is hinged to the end of the choke valve, and the front end of the choke valve is hinged to the outer duct hinge support, ensuring that the direction pull rod and the choke valve are always parallel during the movement process; one end of the choke valve pull rod is hinged to the choke valve through a small pull rod, and the other end is correspondingly hinged to the inner duct hinge support; the choke valve mounting support is fixed to the back of the choke valve.

[0014] The present invention has the following beneficial effects compared with the prior art:

[0015] (1) Simplify large and complex parts in the reverse thrust device of aero-engines, and greatly reduce the overall weight of the test bench on the premise of ensuring the movement requirements.

[0016] (2) Adopt a hoisting and fixing method for the overall test bench through a gantry crane frame, simulating the installation method of the actual engine reverse thrust device, making the force on the test bench more reasonable.

[0017] (3) Replace the engine fairing with a movable outer cover connected by flanges, shorten the length dimension but retain the complete spatial structure of the reverse thrust device. At the same time, hinge supports with different orientations are set, which can study the dynamic effects of choke valves in any orientation on the reverse thrust device, and are convenient for disassembly and assembly.

[0018] (4) Change the traditional pneumatic load application method to hydraulic cylinder loading, eliminate the influence of sealing performance on the test bench, and simplify the complexity of the test bench.

[0019] (5) Set a load force parallel loading mechanism between the choke valve and the movable outer cover to ensure that the direction of the load force received by the choke valve is always parallel to the air flow direction.

[0020] (6) Adopt a new underactuated structure design for the choke valve, add a small pull rod between the pull rod and the choke valve, and meet the research on the movement law of the choke valve under different loads.

[0021] (7) A detachable bushing is installed inside the sliding guide rail of the movable cover. The influence of the friction clearance characteristics of the guide rail on the jamming problem of the mechanism can be studied by changing the bushing material, size or friction coefficient. Brief Description of the Drawings

[0022] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a simulation test bench for an aero-engine reverse thrust device proposed by the present invention;

[0023] Figure 2 is Figure 1 a front view schematic diagram of a partial structure in FIG.

[0024] Figure 3 FIG. 2 is a schematic diagram of the structure of the C-shaped movable outer cover;

[0025] Figure 4 FIG. 3 is a partial schematic diagram of the installation of the flow blocking door and the pull rod assembly;

[0026] Among them, reference numerals: 1 - bottom plate; 2 - gantry column; 3 - actuator support plate; 4 - synchronous actuator; 41 - actuator hinge support 5 - spherical pair; 6 - gantry cross beam; 7 - hoisting cross beam; 8 - connecting frame; 9 - hydraulic cylinder; 10 - inner duct; 11 - C-shaped movable outer cover; 111 - semi-circular flange; 112 - cylindrical steel plate; 113 - outer duct hinge support; 114 - direction pull rod hinge support; 115 - T-shaped guide rail; 12 - direction pull rod; 13 - flow blocking door installation support; 14 - flow blocking door; 15 - bushing; 16 - T-shaped groove; 17 - inner duct hinge support; 18 - flow blocking door pull rod; 19 - connecting rod; 20 - small pull rod. Detailed Embodiment

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0029] Refer to the attached Figure 1 and 2, a specific structure of an embodiment of a simulation test bench for an aeroengine reverse thrust device proposed by the present invention is given. The test bench includes a bottom plate 1, gantry columns 2, actuator support plates 3, synchronous actuators 4, gantry crossbeams 6, hoisting crossbeams 7, connecting frames 8, hydraulic cylinders 9, inner ducts 10, C-shaped movable outer covers 11, choke doors 14 and tie rod assemblies; the bottom plate 1 is of a rectangular structure; four gantry columns 2 are provided, and are respectively vertically and fixedly connected to the four corners of the upper surface of the bottom plate 1; the gantry crossbeams 6 are respectively fixedly connected between the tops of the front and rear two gantry columns 2 on the left side and between the tops of the front and rear two gantry columns 2 on the right side; the hoisting crossbeam 7 is fixedly connected between the middle parts of the upper end faces of the left and right gantry crossbeams 6; the hydraulic cylinder 9 is vertically fixed below the left end of the hoisting crossbeam 7, and one end of the piston rod faces downward; the connecting frame 8 is horizontally fixedly connected below the middle area of the hoisting crossbeam 7; the inner duct 10 is fixedly connected to the lower end of the connecting frame 8; the C-shaped movable outer covers 11 are arranged on the front and rear sides of the inner duct 10, and the upper and lower ends of the open side thereof are respectively in movable pair cooperation with the upper and lower ends of the inner duct 10; the actuator support plates 3 are fixedly connected between the upper and lower parts of the front and rear two gantry columns 2 on the right side; the synchronous actuators 4 are symmetrically arranged on the upper and lower sides of the two C-shaped movable outer covers 11, one end of which is in spherical pair connection with the C-shaped movable outer cover, and the other end is in spherical pair connection with the actuator support plate, that is, each movable outer cover 11 is driven by two synchronous actuators 4; the choke door 14 is arranged inside the middle of the C-shaped movable outer cover 11; the choke door 14 is connected to the inner duct 10 and the C-shaped movable outer cover 11 through a tie rod assembly.

[0030] Wherein, T-shaped grooves 16 are respectively arranged at the upper and lower ends of the inner duct 10, and six inner duct hinge supports 17 are vertically and uniformly arranged at the corresponding positions on the right side of the front end face and the rear end face of the inner duct 10 for connecting the tie rod assembly; the upper and lower ends of the C-shaped movable outer cover 11 are respectively in movable pair cooperation with the T-shaped grooves 16 at the upper and lower ends of the inner duct; in this embodiment, bushings 15 are installed inside the T-shaped grooves 16 for studying the friction characteristics of the T-shaped grooves 16.

[0031] The C-shaped movable outer cover 11 is composed of two semi-circular flanges and a cylindrical steel plate 112 connected between the inner circumferences of the two semi-circular flanges 111; T-shaped guide rails 115 that cooperate with the T-shaped groove 16 moving pairs are respectively arranged at the upper and lower ends of the open side of the semi-circular flange 111; on the upper and lower parts of the right end face of the semi-circular flange 111 far from one side of the actuating cylinder support plate 3, actuating cylinder hinge supports 41 are respectively arranged; rectangular grooves are arranged at the positions corresponding to the actuating cylinder 4 on the upper and lower parts of the semi-circular flange 111 close to one side of the actuating cylinder support plate 3; one end of the synchronous actuating cylinder 4 is connected to the actuating cylinder hinge support 41 through a spherical pair 5, and the other end passes through the rectangular groove and is connected to the actuating cylinder support plate 3 through a spherical pair 5; wherein, outer duct hinge supports 113 and direction pull rod hinge supports 114 with the same orientation are evenly distributed on the inner circumferential end faces of the two semi-circular flanges 111 respectively, for connecting the flow blocking door 14 and the pull rod assembly.

[0032] The pull rod assembly includes a direction pull rod 12, a flow blocking door mounting support 13, a flow blocking door pull rod 18, a connecting rod 19 and a small pull rod 20; one end of the direction pull rod 12 is correspondingly hinged to the direction pull rod hinge support 114, and the other end is hinged to one end of the connecting rod 19; the other end of the connecting rod 19 is hinged to the end of the flow blocking door 14 through a hinge support, and the front end of the flow blocking door 14 is correspondingly hinged to the outer duct hinge support 113 to ensure that the direction pull rod 12 and the flow blocking door 14 are always parallel during the movement process; one end of the flow blocking door pull rod 18 is hinged to the bottom surface of the flow blocking door 14 through a small pull rod 20, and the other end is correspondingly hinged to the inner duct hinge support 113; the flow blocking door mounting support 13 is fixed to the back of the flow blocking door 14 for mounting a torsion spring.

[0033] The test method using this test bench includes the following steps:

[0034] S1. Assemble the test bench main body, drive system and components;

[0035] S2. Install the speed sensor and displacement sensor on the flow blocking door and the C-shaped movable outer cover 11 respectively, and install the tension sensor at the connection of the loading rope;

[0036] S3. Install the strain gauge inside the T-shaped groove 16 to detect the real-time pressure of the guide rail, and connect each sensor and strain gauge to the computer system;

[0037] S4. Start the drive system, and the synchronous actuating cylinder drives the C-shaped movable outer cover 11 to move;

[0038] S5. Observe the changes of various parameters through the computer and analyze them;

[0039] S6. Change the magnitude of the load force, the material of the guide rail bushing 15 or the friction coefficient to conduct repeated tests and compare and analyze the test results.

[0040] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the spirit of the present invention's design, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An aircraft engine reverse thrust device simulation test bench, characterized in that: The test bench includes a base plate, gantry columns, gantry beams, a hoisting beam, a connecting frame, an inner channel, a C-shaped movable outer cover, a synchronous actuator, an actuator support plate, a hydraulic cylinder, a baffle and a pull rod assembly; the gantry columns are vertically arranged at the four corners of the upper surface of the base plate; the gantry beams are arranged between the top ends of the two front and rear gantry columns on the left and between the top ends of the two front and rear gantry columns on the right; the hoisting beam is arranged between the middle parts of the upper end surfaces of the gantry beams on both sides; the hydraulic cylinder is vertically fixed to the lower part of one end of the hoisting beam; the connecting frame is transversely fixed to the lower middle area of ​​the hoisting beam ; The inner channel is fixedly connected to the lower end of the connecting frame; the C-shaped movable outer cover is symmetrically arranged on the left and right sides of the inner channel, and the upper and lower ends of its opening side correspond to the upper and lower movable pairs of the inner channel respectively; the actuator support plate is arranged between the upper and lower parts of the two front and rear gantry columns on the right side; the synchronous actuator is symmetrically arranged on the upper and lower sides of the C-shaped movable outer cover, one end of which is connected to the ball pair of the C-shaped movable outer cover, and the other end is connected to the ball pair of the actuator support plate; the baffle is arranged inside the C-shaped movable outer cover; the baffle is connected to the inner channel and the C-shaped movable outer cover through a pull rod assembly; The upper and lower ends of the inner channel are respectively provided with T-slots, and the right sides of the front and rear end surfaces of the inner channel are respectively vertically evenly distributed with six inner channel hinge supports for connecting the pull rod assembly; the upper and lower ends of the C-shaped movable outer cover are respectively matched with the T-slot movable pairs at the upper and lower ends of the inner channel; The C-type movable outer cover is composed of two semicircular flanges and a cylindrical steel plate connected between the inner circumferences of the two semicircular flanges; The upper and lower ends of the semicircular flange opening side are respectively provided with T-shaped guide rails that cooperate with the T-shaped slot moving pair; Bushings are installed inside the T-slots to study the friction characteristics of the guide rails.

2. The simulation test bench for the reverse thrust device of an aero-engine according to claim 1, wherein: Actuator cylinder hinge supports are respectively arranged on the upper and lower parts of the right end surface of the semicircular flange away from the actuator cylinder support plate; rectangular grooves are arranged on the upper and lower parts of the semicircular flange close to the actuator cylinder support plate at positions corresponding to the actuator cylinder; one end of the synchronous actuator is connected to the actuator cylinder hinge support through a ball pair, and the other end passes through the rectangular groove and is connected to the actuator cylinder support plate through a ball pair; the inner circumferential end surface of the semicircular flange is evenly distributed with external duct hinge supports and direction pull rod hinge supports in the same orientation, which are used to connect the baffle door and the pull rod assembly.

3. The simulation test bench for an aero-engine reverse thrust device according to claim 2, characterized in that: The pull rod assembly includes a direction pull rod, a baffle door mounting support, a baffle door pull rod, a connecting rod and a small pull rod; one end of the direction pull rod is hinged to the direction pull rod hinge support, and the other end is hinged to one end of the connecting rod; the other end of the connecting rod is hinged to the end of the baffle door, and the front end of the baffle door is hinged to the outer duct hinge support to ensure that the direction pull rod and the baffle door are always parallel during movement; one end of the baffle door pull rod is hinged to the baffle door through a small pull rod, and the other end is hinged to the inner duct hinge support; the baffle door mounting support is fixed to the back of the baffle door.

Images