An axisymmetric vector nozzle single-link simplified test bench

Abstract

The present invention provides a single-link simplified test bench for an axisymmetric vector nozzle, which includes a frame, a simplified A9 ring, a simplified A8 ring, an expansion adjusting vane, a convergence adjusting vane, a driving device and a loading device; the simplified A9 ring and the simplified A8 ring are flat plate-like structures; the driving device includes an A8 actuator and an A9 actuator; the simplified A9 ring is connected to the expansion adjusting vane; a guide rail is horizontally installed on the vertical part of the frame, and the simplified A8 ring is slidably connected to the guide rail; a roller is rotatably installed on the simplified A8 ring, a convergence skeleton is fixedly installed on the convergence adjusting vane, and the roller is in close contact with the surface of the convergence skeleton; the loading device includes a connecting convergence vane actuator and an expansion vane actuator, and the convergence adjusting vane and the expansion adjusting vane are connected by a rotating pair. The technical solution of the present invention solves the technical problems of the existing axisymmetric thrust vector nozzle test bench, such as long processing cycle, cumbersome assembly and high cost.

Description

Technical Field

[0001] The present invention relates to the technical field of axisymmetric vector nozzles, and in particular, to an axisymmetric vector nozzle single-link simplified test bench. Background Art

[0002] The axisymmetric thrust vector nozzle is an advanced aviation technology. When applied to an engine, it can achieve omnidirectional vector propulsion, and is easy to retrofit and widely used. However, this mechanism is a highly underconstrained complex mechanism. Therefore, limited by calculation conditions, most of the understanding of the performance of the axisymmetric vector tail nozzle needs to be tested through a test bench. The key to the axisymmetric vector nozzle test lies in the simulation of the reaction forces of each kinematic pair. The three-dimensional test bench in the prior art has a long processing cycle, cumbersome assembly, complex positioning and loading mechanisms, and high costs. Summary of the Invention

[0003] In view of the above-mentioned technical problems of the existing axisymmetric thrust vector nozzle test bench, such as long processing cycle, cumbersome assembly, high costs, etc., an axisymmetric vector nozzle single-link simplified test bench is provided. The limit state is simplified for research, and the axisymmetric vector tail nozzle mechanism is simplified in design. It can save the time for building a three-dimensional axisymmetric vector nozzle test bench, save costs, and at the same time save the time for conducting experiments, and is more convenient for comparing the simulation data of the limit state with this test bench.

[0004] The technical means adopted by the present invention are as follows:

[0005] An axisymmetric vector nozzle single-link simplified test bench, comprising a frame, a simplified A9 ring, a simplified A8 ring, an expansion adjusting piece, a convergence adjusting piece, a driving device, and a loading device;

[0006] Both the simplified A9 ring and the simplified A8 ring are flat plate-like structures, with lengths respectively the same as the diameters of the A9 steering control ring and the A8 adjusting ring of the axisymmetric vector nozzle, thicknesses respectively the same as the thicknesses of the A9 steering control ring and the A8 adjusting ring, and widths respectively slightly wider than the heights of the A9 steering control ring and the A8 adjusting ring;

[0007] The frame includes a vertical part and a horizontal part;

[0008] The driving device includes an A8 actuator and an A9 actuator;

[0009] The fixed ends of the A8 actuator and the A9 actuator are respectively installed on the vertical part of the frame through a revolute pair, and the movable ends are respectively fixedly connected to the simplified A8 ring and the simplified A9 ring;

[0010] The simplified A9 ring is connected to the expansion adjustment piece through a triangular tie rod and an expansion bracket; both ends of the triangular tie rod are respectively connected to the simplified A9 ring and the expansion bracket through rotating pairs, and the expansion bracket is fixedly connected to the expansion adjustment piece; a support rod is arranged at the bottom of the simplified A9 ring, and the support rod is installed on the horizontal part of the frame through a rotating pair;

[0011] A guide rail is horizontally installed on the vertical part of the frame, and the simplified A8 ring is slidably connected to the guide rail;

[0012] A roller is rotatably installed on the simplified A8 ring, a convergence skeleton is fixedly installed on the convergence adjustment piece, the end of the convergence skeleton is installed on the vertical part of the frame through a rotating pair, and the roller is in close contact with the surface of the convergence skeleton;

[0013] The loading device includes a convergence piece actuator cylinder and an expansion piece actuator cylinder. The fixed end of the convergence piece actuator cylinder is installed on the vertical part of the frame through a rotating pair, and the movable end is fixedly connected to the convergence adjustment piece; the fixed end of the expansion piece actuator cylinder is installed on the horizontal part of the frame through a rotating pair, and the movable end is fixedly connected to the expansion adjustment piece; the convergence adjustment piece and the expansion adjustment piece are connected through a rotating pair.

[0014] Further, the A8 actuator cylinder includes an A8 hydraulic cylinder and an A8 hydraulic rod; one end of the A8 hydraulic cylinder is a fixed end and is installed on the vertical part of the frame through a rotating pair; one end of the A8 hydraulic rod is a movable end and is fixedly connected to the simplified A8 ring through a bifurcated connecting rod, and both ends of the bifurcated connecting rod are respectively fixedly connected to the A8 hydraulic rod and the simplified A8 ring.

[0015] Further, the bifurcated connecting rod is a U-shaped rod, and the open end of the U-shaped rod is fixedly connected to the simplified A8 ring.

[0016] Further, the A9 actuator cylinder includes an A9 hydraulic cylinder and an A9 hydraulic rod; one end of the A9 hydraulic cylinder is a fixed end and is installed on the vertical part of the frame through a rotating pair; one end of the A9 hydraulic rod is a movable end and is fixedly connected to the simplified A9 ring.

[0017] Further, the roller is rotatably installed on the simplified A8 ring through a shaft and a shaft sleeve.

[0018] Further, a convergence skeleton mounting seat is arranged on the vertical part of the frame, and the end of the convergence skeleton is installed on the convergence skeleton mounting seat through a rotating pair.

[0019] Further, the convergence adjustment piece and the expansion adjustment piece are connected through a cross joint, and the cross joint is respectively connected to the convergence adjustment piece and the expansion adjustment piece through a rotating pair.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The single-link simplified test bench for the axisymmetric vector nozzle provided by the present invention simplifies the three-dimensional nozzle mechanism, can achieve the given deflection angles of the expansion piece and the convergent piece, analyze the kinematic and dynamic data in each state, analyze different limit states, is simpler to operate compared with the three-dimensional mechanism, has a good simulation effect on friction and wear, and can save costs at the same time.

[0022] For the above reasons, the present invention can be widely promoted in the field of axisymmetric vector nozzles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the test bench described in the present invention.

[0025] Figure 2 It is a schematic structural diagram of the bifurcated connecting rod described in the present invention.

[0026] In the figure: 1, frame; 101, vertical part; 102, convergent frame mounting seat; 103, horizontal part; 2, A9 hydraulic cylinder; 3, A9 hydraulic rod; 4, simplified A9 ring; 5, triangular tie rod; 6, expansion bracket; 7, expansion adjusting piece; 8, guide rail; 9, A8 hydraulic cylinder; 10, A8 hydraulic rod; 11, bifurcated connecting rod; 12, simplified A8 ring; 13, roller; 14, convergent frame; 15, convergent piece actuating cylinder; 16, convergent adjusting piece; 17, cross joint; 18, expansion piece actuating cylinder; 19, support rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine the embodiments to detail the present invention.

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0031] In the description of the present invention, it should be understood that the orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. generally indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention. The orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0032] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figures and other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures for the device. For example, if the device in the attached drawing is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0033] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus cannot be construed as limitations on the protection scope of the present invention.

[0034] Embodiment 1

[0035] As Figure 1 shown, the present invention provides an axisymmetric vector nozzle single-link simplified test bench, which includes a frame 1, a simplified A9 ring 4, a simplified A8 ring 12, an expansion adjusting piece 7, a convergence adjusting piece 16, a driving device and a loading device;

[0036] Both the simplified A9 ring 4 and the simplified A8 ring 12 are in a planar plate-like structure, with lengths respectively the same as the diameters of the A9 steering control ring and the A8 adjusting ring of the axisymmetric vector nozzle, thicknesses respectively the same as the thicknesses of the A9 steering control ring and the A8 adjusting ring, and widths respectively slightly wider than the heights of the A9 steering control ring and the A8 adjusting ring;

[0037] The frame 1 includes a vertical part 101 and a horizontal part 103;

[0038] The driving device includes an A8 actuator and an A9 actuator;

[0039] The fixed ends of the A8 actuator and the A9 actuator are both installed to the vertical part 101 of the frame 1 through rotating pairs, and the movable ends are respectively fixedly connected to the simplified A8 ring 12 and the simplified A9 ring 4;

[0040] The simplified A9 ring 4 is connected to the expansion adjustment piece 7 through a triangular pull rod 5 and an expansion bracket 6; both ends of the triangular pull rod 5 are respectively connected to the simplified A9 ring 4 and the expansion bracket 6 through rotating pairs, and the expansion bracket 6 is fixedly connected to the expansion adjustment piece 7; a support rod 19 is arranged at the bottom of the simplified A9 ring 4, and the support rod 19 is installed on the horizontal part 103 of the frame 1 through a rotating pair.

[0041] A guide rail 8 is horizontally installed on the vertical part 101 of the frame 1, and the simplified A8 ring 12 is slidably connected to the guide rail 8. The A8 actuator is used to drive the simplified A8 ring 12 to move linearly along the guide rail 8.

[0042] A roller 13 is rotatably installed on the simplified A8 ring 12, a convergence skeleton 14 is fixedly installed on the convergence adjustment piece 16, and the end of the convergence skeleton 14 is installed on the vertical part 101 of the frame 1 through a rotating pair. The roller 13 is in close contact with the surface of the convergence skeleton 14.

[0043] The loading device includes a convergence piece actuator 15 and an expansion piece actuator 18. The fixed end of the convergence piece actuator 15 is installed on the vertical part 101 of the frame 1 through a rotating pair, and the movable end is fixedly connected to the convergence adjustment piece 16; the fixed end of the expansion piece actuator 18 is installed on the horizontal part 103 of the frame 1 through a rotating pair, and the movable end is fixedly connected to the expansion adjustment piece 7; the convergence piece actuator 15 and the expansion piece actuator 18 are respectively used to apply loads to the convergence adjustment piece 16 and the expansion adjustment piece 7; the convergence adjustment piece 16 and the expansion adjustment piece 7 are connected through a rotating pair.

[0044] Further, the A8 actuator includes an A8 hydraulic cylinder 9 and an A8 hydraulic rod 10; one end of the A8 hydraulic cylinder 9 is a fixed end and is installed on the vertical part 101 of the frame 1 through a rotating pair; one end of the A8 hydraulic rod 10 is a movable end and is fixedly connected to the simplified A8 ring 12 through a bifurcated connecting rod. Both ends of the bifurcated connecting rod are respectively fixedly connected to the A8 hydraulic rod 10 and the simplified A8 ring 12; the bifurcated connecting rod 12 is equivalent to extending the A8 actuator and can avoid movement interference between the A8 actuator and the convergence skeleton 14.

[0045] Further, the bifurcated connecting rod 11 is a U-shaped rod, and the open end of the U-shaped rod is fixedly connected to the simplified A8 ring 12.

[0046] Further, the A9 actuator includes an A9 hydraulic cylinder 2 and an A9 hydraulic rod 3; one end of the A9 hydraulic cylinder 2 is a fixed end and is installed on the vertical part 101 of the frame 1 through a rotating pair; one end of the A9 hydraulic rod 3 is a movable end and is fixedly connected to the simplified A9 ring 4.

[0047] Further, the roller 13 is rotatably mounted on the simplified A8 ring 12 through a shaft and a bushing.

[0048] Further, a converging frame mounting seat 102 is provided on the vertical portion 101 of the frame 1, and the end of the converging frame 14 is mounted to the converging frame mounting seat 102 through a rotating pair.

[0049] Further, the converging adjusting piece 16 and the expanding adjusting piece 7 are connected by a cross joint 17, and the cross joint 17 is respectively connected to the converging adjusting piece 16 and the expanding adjusting piece 7 through a rotating pair.

[0050] The axisymmetric vector nozzle includes an A9 steering control ring (for controlling steering and performing vector deflection) and an A8 adjusting ring (for adjusting the throat area, also known as the throat area adjusting ring). The three-dimensional test benches in the prior art usually adopt a three-dimensional A8 and A9 ring structure for simulation. When performing simulation, 15 links are connected at the edges, and the structure is complex. However, in the present invention, one of the links is simplified, which can save the time for building the three-dimensional axisymmetric vector nozzle test bench, save costs, and at the same time save the time for experiments. It is more convenient to compare the simulation data of the limit state with this test bench. The present invention simplifies the driving device to the same plane. At the same time, in order to avoid interference problems after simplification, the A8 and A9 rings are simplified. The length and thickness of the simplified structure are respectively the same as the diameter length and thickness of the A9 steering control ring and the A8 adjusting ring of the axisymmetric vector nozzle, and the width is slightly wider to avoid interference and does not affect the motion law. By using the simplified A9 ring and the simplified A8 ring provided by the present invention, the problem that the central axis of the three-dimensional A9 and A8 ring structures can move is ignored during the test process, and only the axis deflection is considered. The simplified A9 ring is connected to the frame through a support rod and a rotating pair, and can realize the deflection of the simplified A9 ring. At the same time, through the setting of the guide rail, the simplified A8 ring can be constrained to maintain linear motion. The simplified A8 ring and the simplified A9 ring will not affect the motion characteristics of a single link and can also avoid the generation of interference problems.

[0051] During the test, starting the converging piece actuator 15 and the expanding piece actuator 18 can respectively apply loads to the converging adjusting piece 16 and the expanding adjusting piece 7 as needed (the specific load is determined according to the test requirements);

[0052] Starting the A9 actuator can drive the simplified A9 ring 4 to move through the A9 hydraulic rod 3, and then drive the expanding adjusting piece 7 to swing through the triangular pull rod 5 and the expanding bracket 6, change the angle of the expanding adjusting piece 7, achieve the purpose of deflection, and enable the simplified A9 ring 4 to deflect to the required state;

[0053] Similarly, starting the A8 actuator can drive the simplified A8 ring 12 to move through the A8 hydraulic rod 10. At the same time, through the action of the guide rail 8, the movement of the simplified A8 ring 12 can be constrained to be only linear. During the movement, the roller 13 can roll on the surface of the convergent framework 14 and apply pressure. As the A8 actuator drives the back-and-forth movement of the simplified A8 ring 12 and the roller 13, the convergent framework 14 can drive the convergent adjusting piece 16 to rotate, thereby realizing the adjustment of the deflection angle of the convergent adjusting piece 16.

[0054] Further, a speed sensor and a displacement sensor are respectively installed on the convergent adjusting piece 16 and the expansion adjusting piece 7, for collecting the speed data and displacement data of the convergent adjusting piece 16 and the expansion adjusting piece 7 during the movement process and in different working states.

[0055] Further, pressure sensors are respectively installed at the connection between the simplified A9 ring 4 and the triangular tie rod 5, the connections between the cross joint 17 and the convergent adjusting piece 16 and the expansion adjusting piece 7, the connection between the convergent framework 14 and the convergent framework mounting seat 102, and the roller 13, for collecting the pressure data at various locations during the working process.

[0056] Further, strain gauges are respectively installed on the roller 13, the convergent framework 14, the triangular tie rod, the convergent adjusting piece 16 and the expansion adjusting piece 7, for collecting the deformation data of each structure in different working states.

[0057] The limit states of the deflection of the convergent adjusting piece and the expansion adjusting piece of the axisymmetric vector nozzle include three states: large area ratio, small area ratio, and axis deflection of 20°. By adjusting the deflection angles of the convergent adjusting piece 16 and the expansion adjusting piece 7 of the present invention, the simulation of the above three states can be achieved; when using the single-link simplified test bench of the axisymmetric vector nozzle of the present invention for simulation tests, after assembling the various structures of the test bench as required, start the driving device, drive the simplified A9 ring and the simplified A8 ring to move according to the test requirements, and then drive the swinging of the expansion adjusting piece and the convergent adjusting piece. Start the loading device, apply loads to the expansion adjusting piece and the convergent adjusting piece according to the test requirements. By adjusting the driving device and the loading device, the expansion adjusting piece and the convergent adjusting piece can reach different limit states. The speed data, displacement data, pressure data, and deformation data monitored during the movement process and when reaching different limit states can be used for relevant force and friction wear analysis, and can also be compared and analyzed with the simulation data.

[0058] The test bench provided by the present invention can simulate the expansion adjustment piece and the convergence adjustment piece to reach the specified limit state. By starting the load device while starting the driving device and applying loads to the expansion adjustment piece and the convergence adjustment piece according to the test requirements, the relevant forces, friction and wear, etc. during the movement process between the two specified limit states of the expansion adjustment piece and the convergence adjustment piece can be analyzed. Or, after controlling the expansion adjustment piece and the convergence adjustment piece to reach the specified limit state, then start the load device, and the relevant forces, friction and wear, etc. of each structure and rotating pair of the expansion adjustment piece and the convergence adjustment piece in a certain limit state can be analyzed to see if they conform to the theoretical situation.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An axisymmetric vector nozzle single-link simplified test bench, characterized in that It includes a frame, a simplified A9 ring, a simplified A8 ring, an expansion adjusting piece, a convergence adjusting piece, a driving device and a loading device; Both the simplified A9 ring and the simplified A8 ring are flat plate-like structures, with lengths respectively the same as the diameters of the A9 steering control ring and the A8 adjusting ring of the axisymmetric vector nozzle, thicknesses respectively the same as those of the A9 steering control ring and the A8 adjusting ring, and widths slightly wider than the heights of the A9 steering control ring and the A8 adjusting ring; The frame includes a vertical part and a horizontal part; The driving device includes an A8 actuator cylinder and an A9 actuator cylinder; The fixed ends of the A8 actuator cylinder and the A9 actuator cylinder are both installed to the vertical part of the frame through rotating pairs, and the movable ends are respectively fixedly connected to the simplified A8 ring and the simplified A9 ring; The simplified A9 ring is connected to the expansion adjusting piece through a triangular pull rod and an expansion bracket; both ends of the triangular pull rod are respectively connected to the simplified A9 ring and the expansion bracket through rotating pairs, and the expansion bracket is fixedly connected to the expansion adjusting piece; a support rod is arranged at the bottom of the simplified A9 ring, and the support rod is installed to the horizontal part of the frame through a rotating pair; A guide rail is horizontally installed on the vertical part of the frame, and the simplified A8 ring is slidably connected to the guide rail; A roller is rotatably installed on the simplified A8 ring, a convergence skeleton is fixedly installed on the convergence adjusting piece, the end of the convergence skeleton is installed to the vertical part of the frame through a rotating pair, and the roller is in close contact with the surface of the convergence skeleton; The loading device includes a connecting convergence piece actuator cylinder and an expansion piece actuator cylinder. The fixed end of the convergence piece actuator cylinder is installed to the vertical part of the frame through a rotating pair, and the movable end is fixedly connected to the convergence adjusting piece; the fixed end of the expansion piece actuator cylinder is installed to the horizontal part of the frame through a rotating pair, and the movable end is fixedly connected to the expansion adjusting piece; the convergence adjusting piece and the expansion adjusting piece are connected through a rotating pair.

2. The single-link simplified test bench for an axisymmetric vector nozzle according to claim 1, wherein The A8 actuator cylinder includes an A8 hydraulic cylinder and an A8 hydraulic rod; one end of the A8 hydraulic cylinder is a fixed end and is installed to the vertical part of the frame through a rotating pair; one end of the A8 hydraulic rod is a movable end and is fixedly connected to the simplified A8 ring through a bifurcated connecting rod, and both ends of the bifurcated connecting rod are respectively fixedly connected to the A8 hydraulic rod and the simplified A8 ring.

3. The single-link simplified test bench for an axisymmetric vector nozzle according to claim 2, characterized in that, The bifurcated connecting rod is a U-shaped rod, and the open end of the U-shaped rod is fixedly connected to the simplified A8 ring.

4. The single-link simplified test bench for the axisymmetric vector nozzle according to claim 1, characterized in that, The A9 actuator cylinder includes an A9 hydraulic cylinder and an A9 hydraulic rod; one end of the A9 hydraulic cylinder is a fixed end and is installed to the vertical part of the frame through a rotating pair; one end of the A9 hydraulic rod is a movable end and is fixedly connected to the simplified A9 ring.

5. The single-link simplified test bench for the axisymmetric vector nozzle according to claim 1, characterized in that The roller is rotatably installed on the simplified A8 ring through a shaft and a bushing.

6. The single-link simplified test bench for an axisymmetric vector nozzle according to claim 1, characterized in that, A convergence skeleton mounting seat is arranged on the vertical part of the frame, and the end of the convergence skeleton is installed to the convergence skeleton mounting seat through a rotating pair.

7. The single-link simplified test bench for the axisymmetric vector nozzle according to claim 1, characterized in that, The convergence adjusting piece and the expansion adjusting piece are connected through a cross joint, and the cross joint is respectively connected to the convergence adjusting piece and the expansion adjusting piece through a rotating pair.

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