Laser strapdown inertial navigation test fixture

Abstract

This utility model relates to the field of inertial navigation testing equipment technology, and discloses a laser strapdown inertial navigation testing fixture, including a base, fixing bolts, an extension rod, a transition joint, a connecting rocker arm, and a calibration plate. The base has several fixing holes. The connecting rocker arm is connected to the front side of the base, the bottom end of the extension rod is connected to the top surface of the connecting rocker arm, and the calibration plate is connected to the top end of the extension rod. Through the arrangement of the base, extension rod, connecting rocker arm, and calibration plate, this utility model makes the overall structure of the device lightweight, integrated, and foldable. When folded, it occupies less than 0.5 m³ of space, facilitating transportation and on-site deployment. Furthermore, the entire device can be installed and disassembled in a short time. The time from setup to completion of all aircraft horizontal measurements can be controlled within 2 hours, significantly shortening the on-site operation cycle. After the horizontal measurement is completed, the entire device can be quickly folded up without affecting other assembly and installation work environments on site.

Description

Technical Field

[0001] This utility model relates to the field of inertial navigation testing equipment technology, and in particular to laser strapdown inertial navigation testing fixtures. Background Technology

[0002] Inertial navigation testing systems primarily provide precise spatial coordinate positioning, accurate angular rate, and angular acceleration test benchmarks for performance testing of inertial components or navigation systems. Strapdown inertial navigation systems are frameless systems composed of three rate gyroscopes, three linear accelerometers, and a microcomputer. By eliminating the complex electromechanical platform, they are simple in structure, small in size, light in weight, low in cost, easy to maintain, and highly reliable. Redundancy technology can also improve their fault tolerance. However, during actual installation and calibration, strapdown inertial navigation systems have extremely high requirements for the repeatability of the IMU's installation position, attitude angle, and measurement benchmark. If installation deviations are not detected and corrected in a timely and accurate manner, the attitude and position calculation results output by the system will have large errors, causing the navigation performance to fail to meet the requirements of high-precision missions.

[0003] Traditional calibration methods often rely on manual leveling, mechanical measuring instruments, or large measuring platforms, which are not only inefficient but also greatly affected by the on-site environment, workspace, and the skills of the measuring personnel. They are difficult to meet the integrated requirements of "fast, flexible, and high-precision" for modern aircraft maintenance and periodic calibration. Therefore, there is an urgent need for an auxiliary testing fixture that can achieve rapid on-site assembly and repeatable positioning, and can seamlessly cooperate with high-precision measurement methods such as laser scanning and computer vision. This fixture would allow for accurate measurement and automated correction of the installation error of the strapdown inertial navigation system without changing the aircraft's attitude, thereby significantly improving the system's stability and navigation accuracy. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a laser strapdown inertial navigation test fixture.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The laser strapdown inertial navigation test fixture includes a base, fixing bolts, an extension rod, a transition joint, a connecting rocker arm, and a calibration plate. The base has several fixing holes. The connecting rocker arm is connected to the front side of the base. The bottom end of the extension rod is connected to the top surface of the connecting rocker arm. The calibration plate is connected to the top end of the extension rod.

[0007] As a further embodiment of this utility model, the number of fixing holes is four and they are respectively set at the four corners of the base. The fixing holes adopt a 90° countersunk design, and the contact surface between the fixing holes and the body is designed with a boss.

[0008] As a further embodiment of this utility model, the base is made of ultra-hard aluminum material and has several hollow areas at the bottom, and the extension rod and calibration plate are both made of high-modulus carbon fiber.

[0009] As a further embodiment of this utility model, the calibration plate has several mounting holes at the center of the front side and near the four edges.

[0010] As a further embodiment of this utility model, the fixing bolt is a 90° countersunk bolt, and there are two transition joints. The two transition joints are slidably inserted into the top and bottom ends of the extension rod, respectively. The two transition joints are fixedly installed to the top and bottom ends of the extension rod by two fixing bolts, respectively. The two transition joints are also fixedly installed to the connecting rocker arm and the calibration plate by six fixing bolts.

[0011] As a further embodiment of this utility model, the connecting rocker arm has a hollow internal structure, is made of ultra-hard aluminum material, and has reinforcing ribs fixed inside.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The design incorporates a base, extension rod, connecting rocker arm, and calibration plate, resulting in a lightweight, integrated, and foldable overall structure that occupies less than 0.5 m of space when folded. 3 This device is easy to transport and deploy on-site, and its overall installation and dismantling can be completed in a short time. The time from setup to completion of all aircraft horizontal measurements can be controlled within 2 hours, significantly shortening the on-site operation cycle. After the horizontal measurements are completed, the entire device can be quickly retracted without affecting other assembly and installation work environments on-site. Several mounting holes on the calibration plate provide excellent scalability, allowing for the addition of more cameras. Multiple movable camera mounts can be installed, each holding a vertically movable precision industrial measuring camera, which can be adapted to different aircraft models. The measurement coverage of the testing station can be adjusted in a timely manner to meet the horizontal measurement needs of different models. The base and connecting rocker arm adopt a hollow structure design with hollowing and reinforcing ribs. The extension rod and calibration plate are made of high-modulus carbon fiber material, which reduces the overall weight while maintaining sufficient rigidity. All connections are locked with 90° countersunk bolts, and the sliding plug-in transition joint ensures the locking accuracy of the extension rod. This ensures that the rod can quickly and repeatedly return to the predetermined position after each clamping, improving the consistency and reliability of the test data. The tooling is made of corrosion-resistant and high-strength materials. The structure is simple and the parts are highly interchangeable. Daily maintenance only requires routine cleaning and tightening checks, without the need for complex calibration, which greatly reduces maintenance costs and extends the service life of the equipment. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the front three-dimensional structure of the laser strapdown inertial navigation test fixture proposed in this utility model;

[0015] Figure 2 This is a three-dimensional disassembled structural diagram of the laser strapdown inertial navigation test fixture proposed in this utility model.

[0016] Figure 3 for Figure 2 A magnified schematic diagram of the partial three-dimensional structure of A in the middle;

[0017] Figure 4 This is a schematic diagram of the bottom three-dimensional structure of the laser strapdown inertial navigation test fixture proposed in this utility model.

[0018] In the diagram: 1. Base; 11. Fixing hole; 2. Fixing bolt; 3. Transition joint; 4. Extension rod; 5. Connecting rocker arm; 51. Reinforcing rib; 6. Calibration plate; 601. Mounting hole. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1-4As shown, the laser strapdown inertial navigation test fixture includes a base 1, fixing bolts 2, extension rod 4, transition joint 3, connecting rocker arm 5, and calibration plate 6. The base 1 has several fixing holes 11. The connecting rocker arm 5 is connected to the front side of the base 1. The bottom end of the extension rod 4 is connected to the top surface of the connecting rocker arm 5. The calibration plate 6 is connected to the top end of the extension rod 4.

[0023] like Figures 2-4 As shown, in this embodiment, there are four fixing holes 11, which are respectively set at the four corners of the base 1. The fixing holes 11 adopt a 90° countersunk design and a boss is designed on the contact surface between the fixing holes 11 and the body. The fixing holes 11 are used to fix the measuring device on the accelerometer mounting point. The 90° countersunk design of the fixing holes 11 improves the accuracy of repeated installation. The boss design on the contact surface between the fixing holes 11 and the body better matches the structure of the mounting point.

[0024] like Figures 2-4 As shown, in this embodiment, the base 1 is made of ultra-hard aluminum material and has several hollow areas at the bottom. The extension rod 4 and the calibration plate 6 are both made of high-modulus carbon fiber. The use of ultra-hard aluminum material in the base 1 improves the structural stability and makes it less prone to deformation. The hollow treatment on the bottom surface of the base 1 can reduce the overall weight of the base 1 and facilitate disassembly and assembly during use.

[0025] like Figures 2-4 As shown in this embodiment, the calibration plate 6 has several mounting holes 601 at the center of the front side and near the four edges. By opening several mounting holes 601 on the calibration plate 6, the device has good scalability, which can increase the number of cameras and install multiple movable camera mounts, each of which can be installed with a precision industrial measuring camera that can move up and down. The measurement coverage of the testing station can be adjusted in a timely manner according to the difference in aircraft models, which can meet the horizontal measurement needs of different aircraft models.

[0026] like Figures 2-4 As shown, in this embodiment, the fixing bolt 2 is a 90° countersunk bolt, and there are two transition joints 3. The two transition joints 3 are slidably inserted into the top and bottom ends of the extension rod 4, respectively. The two transition joints 3 are fixedly installed to the top and bottom ends of the extension rod 4 by two fixing bolts 2, respectively. The two transition joints 3 are also fixedly installed to the connecting rocker arm 5 and the calibration plate 6 by six fixing bolts 2, respectively. The fixing bolts 2 are 90° countersunk bolts, which cooperate with the mounting holes on the docking structure to ensure the accuracy of repeated installation. The connection rocker arm 5 and the extension rod 4 are fixedly installed by the transition joints 3 and the fixing bolts 2 to ensure the stability and directional accuracy of the extension rod 4 during use. The calibration plate 6 is also fixedly installed by the transition joints 3, the fixing bolts 2, and the extension rod 4 to ensure the strength and stability of the calibration surface.

[0027] like Figures 2-4 As shown, in this embodiment, the connecting rocker arm 5 has a hollow structure inside. The connecting rocker arm 5 is made of ultra-hard aluminum material. A reinforcing rib 51 is fixed inside the connecting rocker arm 5. The reinforcing rib 51 serves as the connecting component between the extension rod 4 and the base 1. The use of ultra-hard aluminum material ensures a strict vertical angle. The specially designed reinforcing rib 51 serves as a support to ensure the stability and qualified angle of the component, and it will not deform during use.

[0028] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: through the arrangement of the base 1, extension rod 4, connecting rocker arm 5 and calibration plate 6, the overall structure of the device is lightweight, integrated and foldable, and occupies less than 0.5 m of space after folding. 3 This device is easy to transport and deploy on-site, and its overall installation and disassembly can be completed in a short time. The time from setup to completion of all aircraft horizontal measurements can be controlled within 2 hours, significantly shortening the on-site operation cycle. After the horizontal measurements are completed, the entire device can be quickly retracted without affecting other assembly and installation work environments on-site. Several mounting holes 601 on the calibration plate 6 provide excellent scalability, allowing for the addition of more cameras. Multiple movable camera mounts can be installed, each holding a vertically movable precision industrial measuring camera, which can be adjusted according to different aircraft models. The measurement coverage of the testing station can be adjusted in a timely manner to meet the horizontal measurement needs of different models. The base 1 and the connecting rocker arm 5 adopt a hollow structure design with hollow cutouts and reinforcing ribs 51. The extension rod 4 and the calibration plate 6 are made of high-modulus carbon fiber material, which reduces the overall weight while maintaining sufficient rigidity. All connections are locked with 90° countersunk fixing bolts 2. The sliding plug-in transition joint 3 ensures the locking accuracy of the extension rod 4, ensuring that it can quickly and repeatedly return to the predetermined position after each clamping, improving the consistency and reliability of the test data. The tooling is made of corrosion-resistant and high-strength materials. The structure is simple and the parts are highly interchangeable. Daily maintenance only requires routine cleaning and tightening checks, without the need for complex calibration, which greatly reduces maintenance costs and extends the service life of the equipment.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A laser strapdown inertial navigation test tool, comprising a base (1), a fixing bolt (2), an extension rod (4), a transition joint (3), a connecting rocker arm (5) and a calibration plate (6), characterized in that, The base (1) has several fixing holes (11) for connecting the rocker arm (5) to the front side of the base (1), the bottom end of the extension rod (4) is connected to the top surface of the rocker arm (5), and the calibration plate (6) is connected to the top end of the extension rod (4).

2. The laser strapdown inertial navigation test tool of claim 1, wherein, The number of fixing holes (11) is four and they are respectively set at the four corners of the base (1). The fixing holes (11) adopt a 90° countersunk design and the contact surface between the fixing holes (11) and the body is designed with a boss.

3. The laser strapdown inertial navigation test tooling of claim 2, wherein, The base (1) is made of ultra-hard aluminum material and has several hollow areas at the bottom. The extension rod (4) and the calibration plate (6) are both made of high modulus carbon fiber.

4. The laser strapdown inertial navigation test tooling of claim 3, wherein, The calibration plate (6) has several mounting holes (601) at the middle of the front side and near the four edges.

5. The laser strapdown inertial navigation test fixture of claim 4, wherein, The fixing bolt (2) is a 90° countersunk bolt. There are two transition joints (3). The two transition joints (3) are slidably inserted into the top and bottom of the extension rod (4). The two transition joints (3) are fixedly installed to the top and bottom of the extension rod (4) by two fixing bolts (2). The two transition joints (3) are also fixedly installed to the connecting rocker arm (5) and the calibration plate (6) by six fixing bolts (2).

6. The laser strapdown inertial navigation test tool of claim 5, wherein, The connecting rocker arm (5) has a hollow structure inside. The connecting rocker arm (5) is made of ultra-hard aluminum material and has a reinforcing rib (51) fixed inside.

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