A model positioning measurement tool and method suitable for trajectory capture experiments

Abstract

This invention belongs to the field of aerospace structural component positioning technology, and discloses a model positioning measurement tool and method suitable for capture trajectory testing. The tool includes a clamping structure, a platform body, a telescopic measuring plate, a stroke measuring plate, and a lateral constraint structure. The clamping structure is fixed above the platform body and is used to clamp the CTS (Continuous Trajectory Target) hanger. The telescopic measuring plate is mounted below the platform body and can move forward and backward. The stroke measuring plate is rotatably connected to the telescopic measuring plate. A lateral constraint structure is provided in the middle of the telescopic measuring plate, which works in conjunction with the stroke measuring plate to constrain and fix the suspended object. Both the telescopic measuring plate and the stroke measuring plate have measuring ranges. This invention can universally measure and adjust the position of the suspended object on the hanger, facilitating wind tunnel measurements, and is applicable to suspended object models of different scales and types.

Description

Technical Field

[0001] This invention belongs to the field of aviation structural component positioning technology, and relates to a positioning measurement tool and method for aircraft suspensions, specifically a model positioning measurement tool and method suitable for trajectory capture tests. Background Technology

[0002] Suspended objects, as devices attached to aircraft, include various types of drones, pods, and auxiliary fuel tanks. With the increasing functionality of aircraft, any suspended objects that need to be jettisoned, such as drones or those potentially jettisonable, such as auxiliary fuel tanks and pods, must meet the requirements for aircraft-to-aircraft separation safety. This means that during the separation process, the suspended object must not collide with the aircraft and must maintain a minimum distance.

[0003] Current research on the safety of aircraft-projectile separation mainly relies on wind tunnel testing, among which trajectory capture testing, or CTS (Captive Trajectory System) testing, is a relatively effective evaluation method. Trajectory capture testing is based on the coordinated operation of computers, six-degree-of-freedom mechanisms, and wind tunnels. By measuring the aerodynamic load of the launched object, calculating its trajectory, and controlling the six degrees of freedom of the launched object, it simulates the trajectory of the suspended object after it leaves the carrier aircraft.

[0004] CTS (Cyclic Trajectory System) testing primarily uses the attitude of the suspended object at the end of the stroke as the initial state for trajectory research. This necessitates precise positioning of the suspended object before wind tunnel testing, as accurate positioning is crucial to the test results. Currently, the position of the suspended object is generally adjusted by manually measuring the relative position of the tip of symmetrical or adjacent identical suspended objects to the hanger. After determining the position, the model is moved to the end-stroke position, and then the lateral displacement of the model needs to be adjusted to ensure that the model does not shift. This entire process, due to the use of manual measurement, has a large error margin, and the entire model adjustment requires a considerable amount of time. Another method uses measurement positioning blocks. This method can determine the position of the model's tip more accurately and conveniently within the measurement plane, but different measurement positioning blocks need to be designed for different models, and these positioning blocks cannot effectively adjust the lateral attitude of the model. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a model positioning measurement tool and method suitable for trajectory capture experiments. By designing and using this tool, it is possible to quickly locate different suspension separation positions and adjust their attitude.

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

[0007] A model positioning measurement tool suitable for trajectory capture testing includes a clamping structure, a platform body, a telescopic measuring plate, a stroke measuring plate, and a lateral constraint structure. The clamping structure is fixed above the platform body and is used to clamp the CTS hanger. The telescopic measuring plate is mounted below the platform body and can move forward and backward. The stroke measuring plate is connected to the telescopic measuring plate by yaw rotation. The telescopic measuring plate has a lateral constraint structure in the middle, which is used to cooperate with the stroke measuring plate to constrain and fix the suspended object. Both the telescopic measuring plate and the stroke measuring plate have measuring ranges.

[0008] Furthermore, the bottom of the platform body is provided with a sliding groove, and the top of the telescopic measuring plate cooperates with the sliding groove of the platform body.

[0009] Furthermore, the maximum rotation angle of the stroke measuring plate relative to the telescopic measuring plate is 90°.

[0010] Furthermore, the lateral constraint structure includes a lateral constraint rod and a fixed claw. One end of the lateral constraint rod is fixed to the middle of the telescopic measuring plate, and the lateral constraint rod can rotate relative to the telescopic measuring plate along the flight direction. The fixed claw is installed at the other end of the lateral constraint rod, and the fixed claw can rotate relative to the lateral constraint rod along the flight direction. The bottom of the fixed claw is provided with a triangular groove for constraining the suspended object.

[0011] Furthermore, the fixing claw and the lateral constraint rod are detachably connected, and there are fixing claws of different specifications. The size and opening angle of the triangular groove at the bottom of the fixing claws of different specifications are different.

[0012] Furthermore, the clamping structure includes a left clamping plate, a right clamping plate, a front movable plate, and a rear movable plate. The front and rear movable plates are rotatably mounted on the platform body around the center. The left and right clamping plates are respectively mounted between the left and right sides of the front and rear movable plates. The left and right clamping plates are of the same length and are parallel to the heading. It also includes a long screw, which pushes the front or rear movable plate to rotate, thereby adjusting the relative distance between the left and right clamping plates.

[0013] Furthermore, a fixed positioning block is provided on the upper surface of the platform body at the inner side of the center of the front or rear movable plate.

[0014] A model localization measurement method suitable for trajectory capture experiments, using the aforementioned model localization measurement tool suitable for trajectory capture experiments, includes the following steps:

[0015] S1, align the CTS bracket corresponding to the test model with the top position of the measuring tool;

[0016] S2, clamp the CTS hanger using the clamping structure; install the test model below the measuring tool;

[0017] S3, Measure the relative position difference ΔL1 between the head of the CTS rack and the tip of the test model in the heading;

[0018] S4, Measure the vertical relative position ΔL2 between the head of the CTS hanger and the tip of the test model head;

[0019] S5, lower the lateral constraint structure of the measuring tool, adjust the lateral position of the test model, and ensure that the lateral constraint structure can constrain the test model;

[0020] S6, complete the positioning adjustment and remove the measurement platform;

[0021] The experimental model is a suspended object model.

[0022] Furthermore, in S4, if the test model head is in front of the CTS hanger head, the telescopic measuring plate ΔL1 is moved forward; if the test model head is behind the CTS hanger head, the telescopic measuring plate ΔL1 is moved backward.

[0023] Furthermore, in S5, the vertical position of the moving test model is precisely positioned so that the tip of its head is precisely aligned with the scale corresponding to ΔL2+ stroke on the stroke measuring plate.

[0024] The beneficial effects of this invention are:

[0025] 1. This invention can universally measure and adjust the position of suspended objects on the hanger, which is convenient for wind tunnel measurement and can be applied to suspended object models of different scales and types.

[0026] 2. Compared with traditional positioning blocks, this invention can very conveniently adjust the lateral displacement and attitude of the test model;

[0027] 3. The tool of the present invention has a simple structure, is easy and flexible to adjust, and is easy to install;

[0028] 4. This invention is easy to process, has low cost, and can effectively improve the measurement efficiency in wind tunnels and save on test costs. Attached Figure Description

[0029] Figure 1 This is an exploded view of the measuring tool of the present invention.

[0030] Figure 2 This is a top view of the assembly of the measuring tool of the present invention.

[0031] Figure 3 This is a left view of the assembly of the measuring tool of the present invention.

[0032] Figure 4 This is a front view of the assembly of the measuring tool of the present invention.

[0033] Figure 5This is a bottom view of the assembly of the measuring tool of the present invention.

[0034] Figure 6 This is a schematic diagram of an actual test model of a suspended object.

[0035] Figure 7 yes Figure 6 Side view.

[0036] Figure 8 yes Figure 6 The front view.

[0037] Among them, 1—platform body, 2—left clamping plate, 3—right clamping plate, 4—long screw, 5—rear movable plate, 6—front movable plate, 7—reset spring, 8—telescopic measuring plate, 9—stroke measuring plate, 10—lateral constraint rod, 11—fixed claw. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1:

[0040] A model positioning measurement tool suitable for trajectory capture testing includes a clamping structure, a platform body 1, a telescopic measuring plate 8, a stroke measuring plate 9, and a lateral constraint structure. The clamping structure is fixed above the platform body 1 and is used to clamp the CTS hanger. The telescopic measuring plate 8 is mounted below the platform body 1 and can move forward and backward. The stroke measuring plate 9 is rotatably connected to the telescopic measuring plate 8. The telescopic measuring plate 8 has a lateral constraint structure in the middle, which is used to cooperate with the stroke measuring plate 9 to constrain and fix the suspended object. Both the telescopic measuring plate 8 and the stroke measuring plate 9 are provided with measuring ranges.

[0041] The bottom of the platform body 1 is provided with a sliding groove, and the top of the telescopic measuring plate 8 cooperates with the sliding groove of the platform body 1.

[0042] The maximum rotation angle of the stroke measuring plate 9 relative to the telescopic measuring plate 8 is 90°.

[0043] The lateral constraint structure includes a lateral constraint rod 10 and a fixing claw 11. One end of the lateral constraint rod 10 is fixed to the middle of the telescopic measuring plate 8, and the lateral constraint rod 10 can rotate relative to the telescopic measuring plate 8 along the flight direction. The fixing claw 11 is installed at the other end of the lateral constraint rod 10, and the fixing claw 11 can rotate relative to the lateral constraint rod 10 along the flight direction. The bottom of the fixing claw 11 is provided with a triangular groove for constraining the suspended object.

[0044] The fixing claw 11 and the lateral constraint rod 10 are detachably connected. There are different specifications of fixing claw 11, and the size and opening angle of the triangular groove at the bottom of the fixing claw 11 of different specifications are different.

[0045] The clamping structure includes a left clamping plate 2, a right clamping plate 3, a front movable plate 6, and a rear movable plate 5. The front movable plate 6 and the rear movable plate 5 are rotatably mounted on the platform body 1 around the center. The left clamping plate 2 and the right clamping plate 3 are respectively mounted between the left and right sides of the front movable plate 6 and the rear movable plate 5. The left clamping plate 2 and the right clamping plate 3 are of the same length and are parallel to the heading. It also includes a long screw 4, which pushes the front movable plate 6 or the rear movable plate 5 to rotate, thereby adjusting the relative distance between the left clamping plate 2 and the right clamping plate 3.

[0046] The upper surface of the platform body 1 is provided with a fixed positioning block at the inner side of the center of the front movable plate 6 or the rear movable plate 5.

[0047] A model localization measurement method suitable for trajectory capture experiments, using the aforementioned model localization measurement tool suitable for trajectory capture experiments, includes the following steps:

[0048] S1, align the CTS bracket corresponding to the test model with the top position of the measuring tool;

[0049] S2, clamp the CTS hanger using the clamping structure; install the test model below the measuring tool;

[0050] S3, Measure the relative position difference ΔL1 between the head of the CTS rack and the tip of the test model in the heading;

[0051] S4, Measure the vertical relative position ΔL2 between the head of the CTS hanger and the tip of the test model head;

[0052] S5, lower the lateral constraint structure of the measuring tool, adjust the lateral position of the test model, and ensure that the lateral constraint structure can constrain the test model;

[0053] S6, complete the positioning adjustment and remove the measurement platform;

[0054] The experimental model is a suspended object model.

[0055] In S4, pull the telescopic measuring plate. If the head of the test model is in front of the head of the CTS hanger, move the telescopic measuring plate forward by ΔL1. If the head of the test model is behind the head of the CTS hanger, move the telescopic measuring plate backward by ΔL1.

[0056] In S5, the vertical position of the moving test model is precisely positioned so that the tip of its head is accurately positioned on the scale corresponding to ΔL2+ stroke on the stroke measuring plate.

[0057] Example 2:

[0058] Step 1: Align the lower surface of the CTS bracket corresponding to the test model with the upper surface of the measuring tool, and align the center front point of the bracket with the center point of the positioning block of the measuring platform.

[0059] Step 2: By rotating the long screw at the rear of the platform, the screw pushes the clamping block on the left side to move, and at the same time drives the front and rear movable plates to rotate clockwise around the middle. At this time, the clamping blocks on the left and right sides move towards the middle and clamp the hanger.

[0060] Step 3: The relative position ΔL1 between the head of the mounting bracket and the tip of the model head along the trajectory axis of the missile can be accurately measured using a 3D digital model. Pull the movable plate on the lower side of the measuring tool. If the model head is in front of the mounting bracket head, move it forward by ΔL1; if the model head is behind the mounting bracket head, move it backward by ΔL1. The movable plate is engraved with a precise range to ensure accurate movement of ΔL1.

[0061] Step 4: The relative position ΔL2 between the head of the mounting bracket and the tip of the head of the measuring model along the spring-normal body axis can be accurately measured using a 3D digital model. Lower the stroke measuring plate, which is also engraved with a precise range. Its starting scale is the distance from the bottom surface of the lower movable plate to the upper surface of the tool. The CTS model can be moved to precisely position its tip of the head on the corresponding scale on the stroke measuring plate (ΔL2 + stroke).

[0062] Step 5: Lower the lateral constraint rod and the fixing claw, adjust the lateral position of the CTS model to ensure that the fixing claw can constrain the model, and the model is now in the correct end-stroke position.

[0063] Step Six: After the positioning and adjustment are completed, retract each measuring plate and simultaneously rotate the long screw at the rear of the platform in the opposite direction. The spring on the right side will pull the clamping block open, and the tool can be removed.

[0064] The tool body has a clamping mechanism on its horizontal upper surface. Two clamping blocks are mounted on two movable plates at the front and rear, and these plates can rotate around their center. Rotating the tool's rear screw causes the clamping blocks on both sides to converge towards the center. A spring mechanism is located at the front right of the tool and connected to the right clamping block. Rotating the tool's rear screw causes the spring mechanism to pull the clamping blocks on both sides outwards.

[0065] The telescopic plate can move back and forth via a slide groove. The telescopic plate is engraved with a specific range, allowing for accurate measurement of the distance ΔL1 between the leading edge of the telescopic plate and the leading edge of the CTS hanger. The stroke measuring plate is hinged to the telescopic plate. After determining ΔL1, the stroke measuring plate is rotated until it forms a 90° angle with the telescopic plate. The stroke measuring plate is also engraved with a specific range, allowing for accurate measurement of the tip position of the CTS model's stroke end point.

[0066] The telescopic plate has a lateral constraint rod and a fixing claw installed in the middle. The fixing claw can rotate relative to the lateral constraint rod. The fixing claw's fixing groove is a triangular groove that can constrain suspended object models of different diameters. This can be used to adjust the lateral displacement and deflection angle of the model.

[0067] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A model positioning measurement tool suitable for trajectory capture experiments, characterized in that, The system includes a clamping structure, a platform body (1), a telescopic measuring plate (8), a stroke measuring plate (9), and a lateral constraint structure. The clamping structure is fixed above the platform body (1) and is used to clamp the CTS hanger. The telescopic measuring plate (8) is installed below the platform body (1) and can move forward and backward. The stroke measuring plate (9) is connected to the telescopic measuring plate (8) by yaw rotation. The telescopic measuring plate (8) has a lateral constraint structure in the middle and is used to cooperate with the stroke measuring plate (9) to constrain and fix the suspended object. Both the telescopic measuring plate (8) and the stroke measuring plate (9) are equipped with measuring ranges. The lateral constraint structure includes a lateral constraint rod (10) and a fixed claw (11). One end of the lateral constraint rod (10) is fixed to the middle of the telescopic measuring plate (8), and the lateral constraint rod (10) can rotate relative to the telescopic measuring plate (8) along the flight direction. The fixed claw (11) is installed at the other end of the lateral constraint rod (10), and the fixed claw (11) can rotate relative to the lateral constraint rod (10) along the flight direction. The bottom of the fixed claw (11) is provided with a triangular groove for constraining the suspended object. The clamping structure includes a left clamping plate (2), a right clamping plate (3), a front movable plate (6), and a rear movable plate (5). The front movable plate (6) and the rear movable plate (5) are rotatably mounted on the platform body (1) around the center. The left clamping plate (2) and the right clamping plate (3) are respectively mounted between the left and right sides of the front movable plate (6) and the rear movable plate (5). The left clamping plate (2) and the right clamping plate (3) are of the same length and are parallel to the heading. It also includes a long screw (4), which pushes the front movable plate (6) or the rear movable plate (5) to rotate, thereby adjusting the relative distance between the left clamping plate (2) and the right clamping plate (3).

2. The model positioning and measurement tool suitable for trajectory capture experiments according to claim 1, characterized in that, The bottom of the platform body (1) is provided with a sliding groove, and the top of the telescopic measuring plate (8) cooperates with the sliding groove of the platform body (1).

3. The model positioning and measurement tool suitable for trajectory capture experiments according to claim 1, characterized in that, The maximum rotation angle of the stroke measuring plate (9) relative to the telescopic measuring plate (8) is 90°.

4. The model positioning and measurement tool suitable for trajectory capture experiments according to claim 1, characterized in that, The fixing claw (11) and the lateral constraint rod (10) are detachably connected. There are different specifications of fixing claws (11). The size and opening angle of the triangular groove at the bottom of the fixing claws (11) of different specifications are different.

5. A model positioning and measurement tool suitable for trajectory capture experiments according to claim 1, characterized in that, The upper surface of the platform body (1) is provided with a fixed positioning block at the inner side of the center of the front movable plate (6) or the rear movable plate (5).

6. A model positioning measurement method suitable for trajectory capture experiments, using a model positioning measurement tool suitable for trajectory capture experiments as described in any one of claims 2-5, characterized in that, The following steps are involved: S1, align the CTS bracket corresponding to the test model with the top position of the measuring tool; S2, clamp the CTS hanger using the clamping structure; install the test model below the measuring tool; S3, Measure the relative position difference ΔL1 between the head of the CTS rack and the tip of the test model in the heading; S4, Measure the vertical relative position ΔL2 between the head of the CTS hanger and the tip of the test model head; S5, lower the lateral constraint structure of the measuring tool, adjust the lateral position of the test model, and ensure that the lateral constraint structure can constrain the test model; S6, complete the positioning adjustment and remove the measurement platform; The experimental model is a suspended object model.

7. A model positioning measurement method suitable for trajectory capture experiments according to claim 6, characterized in that, In S4, pull the telescopic measuring plate. If the head of the test model is in front of the head of the CTS hanger, move the telescopic measuring plate forward by ΔL1. If the head of the test model is behind the head of the CTS hanger, move the telescopic measuring plate backward by ΔL1.

8. A model positioning measurement method suitable for trajectory capture experiments according to claim 6, characterized in that, In S5, the vertical position of the moving test model is precisely positioned so that the tip of its head is accurately positioned on the scale corresponding to ΔL2+ stroke on the stroke measuring plate.

Images