A vector thrust in-situ calibration device for a six-component force test bench
By designing a vector thrust in-situ calibration device including a hemispherical shell, hydraulic cylinder and ball socket structure, the problem of difficult to ensure calibration accuracy and accuracy of the six-part force tread in the prior art is solved, and the vector force of the six-part force tread is realized to replicate the vector thrust of the engine.
Patent Information
- Application Number
- CN202211213331.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-30
- Publication Date
- 2025-04-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing six-part force bench calibration method cannot accurately reproduce the effect of engine vector thrust on the bench, making it difficult to ensure calibration accuracy and accuracy.
A vector thrust in-situ calibration device including a fixed frame, a driving frame, an engine simulation hanger, a hemispherical shell, a vector calibration force loading rod and a position adjustment component was designed. Vector thrust in different directions and sizes were simulated through hydraulic cylinder and ball socket structures, and the engine simulation hanger generated pitch torque and yaw torque, so that six force measuring sensors could measure these forces and torques.
The vector force of the six-part force mount is realized in-situ calibration, which can reproduce the vector thrust of the engine without the need to set up multiple calibration force generation devices, improving calibration accuracy and accuracy.
Smart Images
Figure CN115585938B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of aero-engine testing, in particular to a vector thrust in-situ calibration device for a six-component force bench. Background Art
[0002] In order to make the aircraft more maneuverable and agile, more and more aircraft are using vector nozzle engine technology. Compared with ordinary thrust engines that only generate forward thrust, vector engines with rotatable nozzles can change the direction of the nozzle, thereby changing the direction of the jet, so that the engine can obtain a certain additional deflection torque. The forward thrust and the deflection torque finally synthesize a specific vector thrust. In order to achieve precise control of the vector thrust, it is first necessary to use a six-component test bench to measure the engine vector thrust. The six-component test bench generally consists of a fixed frame, a dynamic frame and six force sensors, wherein the fixed frame is fixed to the ground, and the dynamic frame is connected to the fixed frame through six force sensors. During measurement, the vector thrust is calculated by substituting the readings on the six force sensors into the working formula of the test bench. Since there are a large number of systematic factors and random factors that interfere with the precision and accuracy during the manufacture and use of the six-component test bench, it must be calibrated regularly to obtain the current working formula of the test bench.
[0003] A commonly used calibration method is to arrange six calibration force generating devices in the same direction or opposite direction as the sensors at the same position of the six force sensors, and then let a single or multiple force generating devices generate a single calibration force or a combined calibration force to calibrate the test bench. The disadvantage of this calibration method is that since the hydraulic cylinders in these calibration force devices are installed in the coaxial direction of the six sensors, the resultant force generated by the combination of multiple hydraulic cylinders is mostly a force spiral, while the instantaneous thrust generated by the engine is mostly a force line vector. Therefore, the calibration force generated by this structural calibration equipment cannot accurately reproduce the effect of the engine vector thrust on the test bench.
[0004] In order to better reproduce the vector thrust of the engine and reduce the number of calibration force generating devices, it is necessary to design a device that can realize in-situ calibration of the vector force of the six-component force test bench. Summary of the invention
[0005] The purpose of the present invention is to provide a vector thrust in-situ calibration device for a six-component force test bench to solve the problems of the above-mentioned background technology.
[0006] The technical solution of the present invention is: a vector thrust in-situ calibration device for a six-component force test bench, comprising a fixed frame, a movable frame, an engine simulation bracket, a hemispherical shell, a vector calibration force loading rod and a position adjustment component; the movable frame is connected to the fixed frame by six force sensors; the engine simulation bracket is detachably connected to the movable frame, and a ball bowl is provided on the engine simulation bracket; the hemispherical shell is fixed to the fixed frame, and an opening is arranged opposite to the ball bowl, and a plurality of ball sockets are arranged inside the hemispherical shell; the vector calibration force loading rod comprises a first ball head rod, a hydraulic cylinder, a tension and compression sensor, and a second ball head rod, the ball head end of the first ball head rod is connected to the ball bowl, the other end of the first ball head rod is connected to the hydraulic cylinder, the hydraulic cylinder and the second ball head rod are connected by the tension and compression sensor, and the ball head end of the second ball head rod is connected to a ball socket in the hemispherical shell; the position adjustment component is connected to the second ball head rod, and is used to adjust the position of the second ball head rod in the ball socket in the hemispherical shell.
[0007] Preferably, the engine simulation bracket includes a connecting rod, a first flange and a second flange, the first flange and the second flange are concentrically arranged, and the first flange and the second flange are connected by a plurality of connecting rods, and the side wall of the first flange and the side wall of the second flange are connected to the longitudinal beam arranged on the moving frame by screws.
[0008] Preferably, the position adjustment assembly includes a guide lever, a U-shaped adjustment support, a base, and a U-shaped support frame; the guide lever is arranged below the vector calibration force loading rod, and a horizontally arranged through hole is provided in the middle of the guide lever; a horizontally arranged support shaft is mounted inside the opening of the U-shaped adjustment support, and the guide lever is arranged in the opening of the U-shaped adjustment support and is slidably connected to the support shaft through the through hole; the base is fixedly connected to the middle of the crossbeam arranged on the fixed frame, and the bottom of the U-shaped adjustment support is rotatably connected to the base through a connecting column; the U-shaped support frame is fixed to one end of the guide lever close to the second ball head rod, and the second ball head rod is clamped in the U-shaped support frame.
[0009] Preferably, threaded holes are provided at the centers of the first flange and the second flange, and a screw is connected to the threaded hole, one end of the screw passes through the first flange and the second flange and is fixed to the ball bowl, there are multiple first ball head rods, and the multiple first ball head rods are of different lengths, and the rod portion of each first ball head rod is provided with an external thread, and the cylinder body of the hydraulic cylinder facing the first ball head rod is provided with an internal thread, and the rod portion of the first ball head rod is threadedly connected to the hydraulic cylinder.
[0010] Preferably, a trumpet-shaped gasket is connected to the side wall of the ball bowl facing the second flange.
[0011] Preferably, a third flange is fixed at the open end of the hemispherical shell, and the third flange is fixed to the fixed frame.
[0012] Preferably, each ball socket has an independent number.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] 1. The present invention is based on the fact that the shell structure has good spatial force transmission performance and can form a load-bearing structure with high bearing capacity and high rigidity with a small component thickness. Therefore, a hemispherical shell is set, and a plurality of ball sockets are provided on the hemispherical shell. At the same time, the present invention changes the ball head end of the second ball head rod to be placed in the ball sockets at different longitudes and latitudes through a position adjustment component, and allows the hydraulic cylinder to generate axial pressures of different sizes, thereby simulating the vector thrusts from different directions and sizes generated by the deflection of the vector nozzle of the vector thrust engine. The first ball head rod pushes the simulated bracket that simulates the engine vector thrust transmission path, and the engine simulated bracket is used to make the dynamic frame generate different pitch moments and yaw moments. These forces and moments will be measured by six force sensors distributed on the dynamic frame, so there is no need to set up multiple calibration force generating devices, and the vector thrust of the engine can be reproduced.
[0015] 2. When changing the direction of the vector calibration force, the present invention distributes Num ball sockets on the hemispherical shell and adjusts the pressure of the hydraulic cylinder to divide the pressure into M loading conditions of different sizes, thereby realizing M×Num vector forces generated during the calibration process. In addition, taking into account the possible axial offset phenomenon of the vector force action point of the engine, in order to simulate the offset, the action point of the vector calibration force loading rod on the engine simulation bracket is changed, that is, the position of the ball bowl is changed N times. At the same time, each time the position of the ball bowl is changed, it is necessary to traverse and measure M forces of different sizes at each ball socket, so a maximum of M×N×Num calibration loading forces can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a side view structural schematic diagram of the present invention;
[0017] Figure 2 A schematic diagram of a ball socket on a hemispherical shell in the present invention;
[0018] Figure 3 It is a schematic diagram of the three-dimensional structure after the present invention is assembled with the six-component force stand;
[0019] Figure 4 It is a structural schematic diagram of the position adjustment component in the present invention;
[0020] Figure 5 It is a schematic diagram of the installation structure of the gasket ring in the present invention. DETAILED DESCRIPTION
[0021] The following is combined with Figures 1 to 5, the specific embodiments of the present invention are described in detail. In the description of the invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.
[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the invention, unless otherwise specified, "plurality" means two or more.
[0023] Example 1
[0024] like Figures 1 to 5 As shown, an embodiment of the present invention provides a vector thrust in-situ calibration device for a six-component force test bench, comprising a fixed frame 5-1, a movable frame 5-2, an engine simulation bracket, a hemispherical shell 3-1, a distance adjustment component, a vector calibration force loading rod and a position adjustment component; the movable frame 5-2 is connected to the fixed frame 5-1 through six force sensors 5-3; the engine simulation bracket is detachably connected to the movable frame 5-2, and a ball bowl 1-5 is provided on the engine simulation bracket; the hemispherical shell 3-1 is fixed on the fixed frame 5-1, and the opening is arranged opposite to the ball bowl 1-5, and a plurality of ball bowls are provided inside the hemispherical shell 3-1 The vector calibration force loading rod includes a first ball head rod 2-1, a hydraulic cylinder 2-2, a tension and compression sensor 2-3 and a second ball head rod 2-4. The ball head end of the first ball head rod 2-1 is connected to the ball bowl 1-5, and the other end of the first ball head rod 2-1 is connected to the hydraulic cylinder 2-2. The hydraulic cylinder 2-2 and the second ball head rod 2-4 are connected through the tension and compression sensor 2-3. The ball head end of the second ball head rod 2-4 is connected to a ball socket in the hemispherical shell 3-1. The position adjustment component is connected to the second ball head rod 2-4, and is used to adjust the position of the second ball head rod 2-4 in the ball socket in the hemispherical shell 3-1.
[0025] The present invention places the ball head end of the second ball head rod 2-4 in the ball sockets at different longitudes and latitudes through a position adjustment component, and allows the hydraulic cylinder 2-2 to generate axial pressures of different sizes, thereby simulating the vector thrusts of the vector thrust engine from different directions and sizes. The first ball head rod 2-1 pushes the simulated bracket that simulates the vector thrust transmission path of the engine, and uses the engine simulated bracket to make the dynamic frame generate different pitch moments and yaw moments. These forces and moments will be measured by six force sensors distributed on the dynamic frame; the number of ball sockets is Num, and the number of ball sockets Num is related to the parameters contained in the polynomial model selected for calibration. The general principle is that the number of all constructed vector forces (different directions, different sizes) is not less than 1.5 times the model parameters), and at the same time, the range of the hydraulic cylinder 2-2 is divided into M (generally M is 3 or 4) equal parts, and then the pressure of the hydraulic cylinder is segmented and increased to the maximum range M times, so that M×Num vector forces generated during the calibration process can be achieved.
[0026] Example 2
[0027] This embodiment defines the structure of the engine simulation bracket on the basis of the embodiment 1, specifically, Figure 3 As shown, in order to facilitate installation and disassembly, the engine simulation bracket includes a connecting rod 1-1, a first flange 1-2 and a second flange 1-3. The first flange 1-2 and the second flange 1-3 are concentrically arranged, and the first flange 1-2 and the second flange 1-3 are connected by multiple connecting rods 1-1. The side walls of the first flange 1-2 and the side walls of the second flange 1-3 are connected to the longitudinal beams arranged on the movable frame 5-2 by screws.
[0028] Example 3
[0029] This embodiment defines the structure of the position adjustment component on the basis of the embodiment 1, specifically, Figures 1 to 4 As shown, the position adjustment component includes a guide lever 4-1, a U-shaped adjustment support 4-2, a base 4-3, and a U-shaped support frame 4-4; the guide lever 4-1 is arranged below the vector calibration force loading rod, and a horizontally arranged through hole is arranged in the middle of the guide lever 4-1; a horizontally arranged support shaft is arranged inside the opening of the U-shaped adjustment support 4-2, and the guide lever 4-1 is arranged in the opening of the U-shaped adjustment support 4-2, and is slidably connected to the support shaft through the through hole; the base 4-3 is fixedly connected to the middle of the crossbeam arranged on the fixed frame 5-1, and the bottom of the U-shaped adjustment support 4-2 is rotatably connected to the base 4-3 through a connecting column; the U-shaped support frame 4-4 is fixed to one end of the guide lever 4-1 close to the second ball head rod 2-4, and the second ball head rod 2-4 is clamped in the U-shaped support frame 4-4.
[0030] When the position of the second ball head rod 2-4 in the ball socket in the hemispherical shell 3-1 is changed by the position adjustment component to change the direction of the vector calibration force, the second ball head rod 2-4 is lifted to a certain ball socket position by the U-shaped support frame 4-4 arranged on the guide lever 4-1, and then the hydraulic cylinder 2-2 provides a pre-tightening force, so that the ball of the first ball head rod 2-1 and the ball bowl 1-5 as well as the ball of the second ball rod 2-4 and the ball socket are in close contact, and finally the guide lever 4-1 is withdrawn.
[0031] Example 4
[0032] Based on Example 2, this embodiment takes into account the possible axial offset of the vector force action point of the engine. In order to simulate the offset, threaded holes are provided at the centers of the first flange 1-2 and the second flange 1-3, and the threaded holes are connected to screw rods 1-4. One end of the screw rod 1-4 passes through the first flange 1-2 and the second flange 1-3 and is fixed to the ball bowl 1-5. There are multiple first ball head rods 2-1, and the multiple first ball head rods 2-1 are of different lengths. The rod portion of each first ball head rod 2-1 is provided with an external thread, and the cylinder body of the hydraulic cylinder 2-2 facing the first ball head rod 2-1 is provided with an internal thread, and the rod portion of the first ball head rod 2-1 is threadedly connected to the hydraulic cylinder 2-2.
[0033] If the point of action of the vector calibration force loading rod on the engine simulation bracket 1 is to be changed, it is necessary to change the position of the ball bowl 1-5 on the central screw 1-4 and replace the first ball head rod 2-1 of the corresponding length, that is, by rotating the screw 1-4, the horizontal distance between the ball bowl 1-5 and the hemispherical shell 3-1 is adjusted. Each time the position of the ball bowl 1-4 is changed, it is necessary to traverse and measure M forces of different magnitudes at each ball socket. For example, the position of the ball bowl 1-5 is changed N times (generally N is 2 or 3) during the entire measurement process. Therefore, the number of all vector forces generated by the entire calibration device during the calibration process can be at most M×N×Num.
[0034] Further, such as Figure 5 As shown, in order to make the ball bowl 1-5 that rotates to the right have higher rigidity and resist bending deformation caused by vector force, a trumpet-shaped gasket 1-6 needs to be connected to the side wall of the ball bowl 1-5 facing the second flange 1-3.
[0035] Further, such as Figure 3 As shown, a third flange 3-2 is fixed at the open end of the hemispherical shell 3-1, and the third flange 3-2 is fixed to the fixed frame 5-1.
[0036] Furthermore, in order to facilitate obtaining the direction of the vector calibration force, each ball socket has an independent number, and the direction of the vector calibration force of the corresponding number can be obtained by querying the ball socket number.
[0037] The overall calibration operation of the present invention is as follows:
[0038] When the six-component force test bench of the engine is calibrated by the present device, the engine simulation bracket 1 is installed on the longitudinal beam set on the moving frame 5-2 through the first flange 1-2 and the second flange 1-3 by screws. After installation, it is necessary to ensure that the straight line where the central axis of the screw rod 1-4 is located coincides with the straight line connecting the center of the hemispherical shell 3-1 and the center of the ball socket at the vertex of the hemispherical shell. The screwing distance between the screw rod 1-4 and the two screw holes at the center of the flange surface of the first flange 1-2 and the second flange 1-3 is adjusted so that the distance between the vertex of the ball bowl 1-5 and the vertex of the central ball socket on the inner side of the hemispherical shell 3-1 is exactly equal to the length of the vector calibration force loading rod, that is, the distance between the vertex of the first ball head rod 2-1 and the vertex of the second ball head rod 2-4. After satisfying the above-mentioned distance and position constraints, tighten the nut of the screw rod 1-4 near the first flange 1-2, and transmit the vector force generated by the vector calibration force loading rod to the simulation bracket through the ball bowl 1-5 and further to the moving frame, and then it is sensed and measured by the six force sensors installed between the moving frame 5-2 and the fixed frame 5-1.
[0039] If the direction of the vector calibration force is to be changed, it is only necessary to change the direction of the loading rod 2, that is, to change the position of the ball socket inside the hemispherical shell 3-1 that is in close contact with the ball head at the top of the second ball head rod 2-4. This function is realized by the guide guide lever 4-1. The rod body of the guide lever 4-1 is drilled with a hole and installed on the support shaft of the U-shaped adjustment support 4-2, so that the guide lever 4-1 can rotate up and down around the support shaft in the latitude direction of the hemispherical shell. The bottom of the U-shaped adjustment support 4-2 is embedded in the base 4-3 through a connecting column and is rotatably connected to it, so that the guide lever 4-1 can rotate left and right around the column in the longitude direction of the hemispherical shell. The base 4-3 is installed in the middle of the rear crossbeam of the fixed frame and serves as the fulcrum of the guide lever 4-1. The adjustment process is as follows: first, the U-shaped support frame 4-4 set on the guide lever 4-1 is used to lift the second ball head rod 2-4 to a certain ball socket position, and then the hydraulic cylinder 2-2 provides a pre-tightening force so that the ball of the first ball head rod 2-1 and the ball bowl 1-5 and the ball of the second ball rod 2-4 and the ball socket are in close contact, and finally the guide lever 4-1 is withdrawn.
[0040] The measurement process is as follows: the hydraulic cylinder range is divided into M equal parts (usually M is 3 or 4), and then the pressure of the hydraulic cylinder is increased to the maximum range in M times. Then the readings on the high-precision tension and compression sensor 2-3 and the readings on the six force sensors are recorded one by one. After the hydraulic cylinder 2-2 is unloaded, the vector calibration force loading rod is lifted to another ball socket position by the guide lever 4, and the responses of the six force sensors on the dynamic frame under the action of another vector calibration force are measured similarly.
[0041] If the point of action of the vector calibration force loading rod on the engine simulation bracket 1 is to be changed, it is necessary to change the position of the ball bowl 1-5 on the central screw 1-4 and replace the first ball head rod 2-1 of the corresponding length. Each time the position of the ball bowl is changed, it is necessary to traverse and measure M forces of different magnitudes at each ball socket. If the position of the ball bowl is changed N times during the entire measurement process (generally N is 2 or 3), the number of all vector forces generated by the entire calibration device during the calibration process can be at most M×N×Num.
[0042] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.
Claims
1. A vector thrust in-situ calibration device for a six-component force test bench, comprising a fixed frame (5-1) and a movable frame (5-2), wherein the movable frame (5-2) and the fixed frame (5-1) are connected via six force sensors (5-3), characterized in that: Also includes: An engine simulation bracket is detachably connected to the moving frame (5-2), and a ball bowl (1-5) is provided on the engine simulation bracket; A hemispherical shell (3-1) is fixed on the fixed frame, and its opening is arranged facing the ball bowl (1-5). A plurality of ball sockets are arranged inside the hemispherical shell (3-1); A vector calibration force loading rod, comprising a first ball head rod (2-1), a hydraulic cylinder (2-2), a tension and compression sensor (2-3) and a second ball head rod (2-4); the ball head end of the first ball head rod (2-1) is connected to the ball bowl (1-5); the other end of the first ball head rod (2-1) is connected to the hydraulic cylinder (2-2); the hydraulic cylinder (2-2) and the second ball head rod (2-4) are connected via the tension and compression sensor (2-3); and the ball head end of the second ball head rod (2-4) is connected to a ball socket in a hemispherical shell (3-1); The position adjustment component is connected to the second ball head rod (2-4) and is used to adjust the position of the second ball head rod (2-4) in the ball socket in the hemispherical shell (3-1).
2. The vector thrust in-situ calibration device for a six-component force test bench according to claim 1, characterized in that: The engine simulation hanger comprises a connecting rod (1-1), a first flange (1-2) and a second flange (1-3); the first flange (1-2) and the second flange (1-3) are arranged concentrically, and the first flange (1-2) and the second flange (1-3) are connected via a plurality of connecting rods (1-1); and the side wall of the first flange (1-2) and the side wall of the second flange (1-3) are connected to a longitudinal beam arranged on the moving frame (5-2) via screws.
3. The vector thrust in-situ calibration device for a six-component force test bench according to claim 1, characterized in that: The position adjustment component comprises: A guide lever (4-1) is arranged below the vector calibration force loading rod, and a horizontally arranged through hole is provided in the middle of the guide lever (4-1); A U-shaped adjustment support (4-2) has an opening inside which a horizontally arranged support shaft is mounted, and the guide lever (4-1) is arranged in the opening of the U-shaped adjustment support (4-2) and is slidably connected to the support shaft through a through opening; The base (4-3) is fixedly connected to the middle part of the crossbeam arranged on the fixed frame (5-1), and the bottom of the U-shaped adjustment support (4-2) is rotatably connected to the base (4-3) via a connecting column; The U-shaped support frame (4-4) is fixed to one end of the guide lever (4-1) close to the second ball head rod (2-4), and the second ball head rod (2-4) is clamped in the U-shaped support frame (4-4).
4. The vector thrust in-situ calibration device for a six-component force test bench according to claim 2, characterized in that: The first flange (1-2) and the second flange (1-3) are both provided with threaded holes at their centers, and a screw rod (1-4) is connected to the threaded holes. One end of the screw rod (1-4) passes through the first flange (1-2) and the second flange (1-3) and is fixed to the ball bowl (1-5). There are a plurality of first ball head rods (2-1), and the plurality of first ball head rods (2-1) are of different lengths. The rod portion of each first ball head rod (2-1) is provided with an external thread. The cylinder body of the hydraulic cylinder (2-2) facing the first ball head rod (2-1) is provided with an internal thread, and the rod portion of the first ball head rod (2-1) is threadedly connected to the hydraulic cylinder (2-2).
5. The vector thrust in-situ calibration device for a six-component force test bench according to claim 4, characterized in that: A trumpet-shaped gasket (1-6) is connected to the side wall of the ball bowl (1-5) facing the second flange (1-3).
6. The vector thrust in-situ calibration device for a six-component force test bench according to claim 1, characterized in that: A third flange (3-2) is fixed at the open end of the hemispherical shell (3-1), and the third flange (3-2) is fixed to the fixed frame (5-1).
7. The vector thrust in-situ calibration device for a six-component force test bench according to claim 1, characterized in that: Each of the ball sockets has an independent number.
Citation Information
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