Zero pressure side slip angle sensor calibration tool

Abstract

The application discloses a zero-pressure side-slip angle sensor calibration tool, which comprises an angle protractor and a connecting rod; the angle protractor comprises a main shaft, a protractor disc and a base, first and second through holes are arranged on central axes of the protractor disc and the base respectively, and the connecting rod is fixedly connected with the main shaft by penetrating the first and second through holes; the connecting rod comprises a connecting part and a clamping part, a clamping groove and a clamping sheet are arranged at one end of the clamping part, and the clamping sheet is clamped with a probe of a side-slip angle sensor by penetrating the clamping groove. The application solves the problems of low test precision, poor reliability and portability of the existing side-slip angle sensor calibration tool.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, and specifically relates to a calibration fixture for a zero-pressure sideslip angle sensor. Background Technology

[0002] The research on sideslip angle sensors is a national strategic development need. Given the current international situation and the increasingly urgent need for domestic production in the aviation field, achieving the localization of high-performance sideslip angle sensors is of great significance. Generally, sideslip angle sensors can be categorized into weather vane sensors, zero-differential-pressure sensors, and differential-pressure ratio sensors.

[0003] With the continuous development of aviation technology, sideslip angle measurement plays a crucial role. Advanced high-performance aircraft require high-precision, high-reliability sideslip angle sensors as a basic requirement. As an important auxiliary device for zero-pressure sideslip angle sensors, the design of zero-pressure sideslip angle sensor calibration fixtures is also a critical step in the entire sideslip angle sensor development process. General sideslip angle sensor calibration fixtures have low testing accuracy, poor reliability, and poor portability, failing to meet the requirements of high-performance aircraft sideslip angle sensors. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a zero-pressure sideslip angle sensor calibration fixture, which solves the problems of low testing accuracy, poor reliability and poor portability of existing sideslip angle sensor calibration fixtures.

[0005] The technical solution of the present invention is: The present invention provides a zero-pressure sideslip angle sensor calibration fixture, including: an angle divider and a connecting rod;

[0006] The angle divider includes a main shaft, an indexing plate, and a base. The indexing plate and the base are respectively provided with a first through hole and a second through hole on their central axes. The connecting rod passes through the first through hole and the second through hole and is fixedly connected to the main shaft.

[0007] The connecting rod includes a connecting part and a snap-fit ​​part. One end of the snap-fit ​​part is provided with a slot and a card. The card passes through the slot and snaps into the probe of the side slip angle sensor.

[0008] Furthermore, the main shaft is detachably connected to the indexing plate, the indexing plate is rotatably connected to the base, and the central axes of the main shaft, the indexing plate, and the base coincide.

[0009] Furthermore, the indexing plate is provided with a coarse adjustment knob, which is located on the side wall of the indexing plate, and the base is provided with a coarse adjustment locking member, which is located on the side wall of the base.

[0010] Furthermore, the angle division instrument also includes a fine adjustment lead screw, which is located on the side away from the coarse adjustment locking member. The fine adjustment lead screw includes a fine adjustment knob and a fine adjustment locking member, which are respectively located at both ends of the fine adjustment lead screw. The fine adjustment lead screw is rotatably connected to the indexing plate.

[0011] Furthermore, the zero-pressure sideslip angle sensor calibration fixture also includes a mounting frame, which includes a first mounting plate, a second mounting plate, and a base plate arranged in parallel from top to bottom. The base is detachably connected to the first mounting plate. The first mounting plate is provided with a third through hole, through which the connecting rod passes. The second mounting plate is detachably connected to the sideslip angle sensor.

[0012] Furthermore, a set of support columns is provided between the second mounting plate and the base plate, the support columns are detachably connected to the second mounting plate, and a set of foot pads is provided at the end of the base plate near the ground.

[0013] Furthermore, one end of the connecting part is fixedly connected to the main shaft, and the other end is fixedly connected to the snap-fit ​​part. The snap-fit ​​part has a groove on the side near the probe, and the width of the groove near the connecting part is smaller than the width of the groove away from the connecting part.

[0014] Furthermore, the slot includes a first slot and a second slot, both of which are parallel to the axial direction of the latching part. The first slot and the second slot penetrate the outer wall of the latching part and are connected to the groove.

[0015] Furthermore, the first card slot is provided with a set of first cards, the length of the first cards being less than the length of the first card slot, and the first cards are slidably connected to the first card slot; the second card slot is provided with a set of second cards, the second cards are slidably connected to the second card slot, and both the first cards and the second cards are engaged with the air inlet on the probe.

[0016] Furthermore, the first card and the second card are respectively provided with a first card hole and a second card hole, both of which are located at one end near the connecting portion.

[0017] The beneficial effects of this invention are as follows: This invention calibrates the sensor by setting an angle divider and a connecting rod. The scale on the angle divider has precise graduation marks, which can achieve high-precision angle division and provide an accurate reference angle for sensor calibration. The first and second through holes on the central axis of the scale and the base ensure that the connecting rod is precisely aligned with the spindle, reducing installation errors and improving the angle transmission accuracy of the overall system. The connecting rod is fixedly connected to the spindle, so that changes in angle division can be transmitted to the sensor probe without loss, ensuring calibration accuracy. The combination of the slot and the card provides reliable probe fixation, preventing data distortion caused by probe loosening or displacement during calibration, improving calibration repeatability and stability, and facilitating quick assembly and disassembly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a zero-pressure sideslip angle sensor calibration fixture provided in this application embodiment;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the angle divider;

[0021] Figure 3 for Figure 1 A schematic diagram of the first structure of the connecting rod;

[0022] Figure 4 for Figure 1 A schematic diagram of the second structure of the connecting rod.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Angle divider, 2-Connecting rod, 3-Mounting bracket, 4-Side slip angle sensor;

[0025] 11-Spindle, 12-Indexing plate, 13-Base, 14-Fine adjustment screw, 21-Connecting part, 22-Snap-fit ​​part, 31-First mounting plate, 32-Second mounting plate, 33-Base plate, 34-Support column, 35-Foot pad;

[0026] 121 - Coarse adjustment knob, 131 - Coarse adjustment locking element, 141 - Fine adjustment knob, 142 - Fine adjustment locking element, 221 - First slot, 222 - Second slot, 223 - First card, 224 - Second card, 225 - Groove. Detailed Implementation

[0027] 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In this invention, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0029] The implementation of the present invention will be described in detail below with reference to the accompanying drawings:

[0030] Figure 1 A schematic diagram of a zero-pressure sideslip angle sensor calibration fixture structure provided in this application embodiment is shown below. Figure 1 As shown, the sideslip angle sensor calibration fixture includes: an angle divider 1, a connecting rod 2, and a mounting bracket 3. Both the angle divider 1 and the sideslip angle sensor 4 to be measured are detachably connected to the mounting bracket 3. This single device integrates angle reference generation, transmission, and sensor fixing functions, eliminating the need for additional auxiliary tools and simplifying the calibration process.

[0031] Figure 2 for Figure 1A schematic diagram of the angle graduated instrument is shown. The angle graduated instrument 1 includes a spindle 11, an indexing plate 12, a base 13, and a fine-tuning screw 14. The central axes of the spindle 11, the indexing plate 12, and the base 13 coincide. The spindle 11 and the indexing plate 12 are detachably connected. The spindle 11 has four bolts for easy assembly and disassembly. The spindle 11 is fixedly connected to a connecting rod 1, which in turn is fixedly connected to the spindle 11, allowing changes in angle graduation to be transmitted to the sensor probe without loss, ensuring calibration accuracy. The base is the fundamental component supporting the entire graduated instrument. It typically has good rigidity and stability and is used for mounting on machine tools, providing a solid foundation. The base provides stable support. The precise connection between the spindle and the connecting rod improves the overall device's resistance to vibration and deformation, making it suitable for various working conditions. The indexing plate is the core component of the graduated instrument, engraved with equally divided scales or indexing holes, used to determine the workpiece's graduation angle. The scales on the indexing plate are usually marked in degrees or minutes to ensure high precision. The spindle of the angle indexing instrument is used to fix the workpiece and can rotate freely on the base. The rotation of the spindle drives the workpiece to rotate to the required angle. A first through hole and a second through hole are respectively provided on the central axis of the indexing plate 12 and the base 13. The connecting rod 2 passes through the first and second through holes and connects to the spindle. The diameters of the first and second through holes are larger than the diameter of the connecting rod 2, and the connecting rod 2 does not contact the indexing plate 12 or the base 13. The first and second through holes on the central axis of the indexing plate 12 and the base 13 ensure precise alignment between the connecting rod and the spindle, reducing installation errors and improving the overall angle transmission accuracy of the system.

[0032] The indexing plate 12 has a coarse adjustment knob 121 on its side wall, and the base 13 has a coarse adjustment locking element 131 on its side wall. The coarse adjustment knob 121 is used for large-range preliminary adjustment of the indexing plate or spindle, which can quickly rotate the indexing instrument to a near-target angle range, reducing adjustment time and improving work efficiency. The coarse adjustment locking element 131 is located on the side of the base 13 and is locked by a pressure plate connected to the indexing plate 12.

[0033] The fine-tuning screw 14 is located opposite the coarse-tuning locking member 131. Both ends of the fine-tuning screw 14 are equipped with a fine-tuning knob 141 and a fine-tuning locking member 142, respectively. The fine-tuning screw 14, through rotation, converts minute linear displacements into angular changes in the indexing plate 12, ensuring adjustment accuracy. The fine-tuning screw 14 features a threaded structure; the thread design provides greater torque and higher adjustment smoothness, facilitating precise angle positioning. After fine-tuning, the fine-tuning locking member 142 secures the screw 14 and the indexing plate 12 through a clamping structure, ensuring the adjusted position will not shift due to external force or vibration. The use of a dual locking device—the coarse-tuning locking member 131 and the fine-tuning locking member 142—ensures that the indexing instrument is not easily shifted due to vibration or external force after coarse adjustment, further improving the reliability of the device.

[0034] The calibration structure also includes a mounting frame 3, which includes a first mounting plate 31, a second mounting plate 32, and a base plate 33. The first mounting plate 31 has a third through hole, through which the connecting rod 2 passes and is connected to the main shaft 21. The base 13 is detachably connected to the first mounting plate 31 by bolts. The side slip angle sensor to be measured is detachably connected to the second mounting plate 32. A set of support columns 34 is provided between the second mounting plate 32 and the base plate 33. The support columns 34 are detachably connected to the second mounting plate 32 and are fixedly connected to the base plate 33. The support columns 34 can adjust the distance between the second mounting plate 32 and the base plate 33. The base plate 33 has a foot pad 35 on the side closest to the ground.

[0035] The connecting rod 2 includes a connecting part 21 and a snap-fit ​​part 22. One end of the connecting part 21 is connected to the main shaft 11, and the other end is connected to the snap-fit ​​part 22. The snap-fit ​​part 22 is provided with a first snap-fit ​​groove 221 and a second snap-fit ​​groove 222 parallel to the central axis of the snap-fit ​​part 22. A first card 223 is provided in the first snap-fit ​​groove 221, and a second card 224 is provided in the second snap-fit ​​groove 222. The first card 223 is slidably connected to the first snap-fit ​​groove 221, and the second card 224 is slidably connected to the second snap-fit ​​groove 222. The width of the first card 223 is smaller than the width of the first snap-fit ​​groove 221, and the width of the second card 224 is smaller than the width of the second snap-fit ​​groove 222. The universal snap-fit ​​method is used to adapt to different models of side-slip angle sensors, ensuring the universality and long-term reliability of the tooling. Both the first card 223 and the second card 224 are inserted into the air inlet on the sideslip angle sensor probe to fix the angle of the sideslip angle sensor probe. The combination of the slot and the card provides reliable probe fixation, preventing data distortion caused by probe loosening or displacement during calibration, and improving the repeatability and stability of calibration.

[0036] The snap-fit ​​part 22 has a groove 225 on the side near the probe. The groove 225 fits the probe. The width of the groove 225 at the end near the connecting part 21 is greater than the width at the end away from the connecting part 21. The first slot 221 and the second slot 222 penetrate the outer wall of the snap-fit ​​part 22 and the bottom of the groove 225. The first card 223 and the second card 224 are respectively provided with a first card hole and a second card hole to facilitate the movement of the first card 223 and the second card 224.

[0037] This invention achieves high precision, high reliability, and convenience by designing a zero-pressure side-slip angle sensor calibration fixture.

[0038] This side-slip angle sensor calibration fixture improves calibration accuracy through several key improvements: The application of an angle divider: The indexing dial features precise scale markings, enabling high-precision angle division and providing an accurate reference angle for sensor calibration. Center axis alignment design: The first and second through holes on the center axes of the indexing dial and base ensure precise alignment of the connecting rod with the spindle, reducing installation errors and improving the overall system's angle transmission accuracy. Stable mechanical transmission: The connecting rod is fixedly connected to the spindle, allowing changes in angle division to be transmitted to the sensor probe without loss, ensuring calibration accuracy.

[0039] This side-slip angle sensor calibration fixture boasts reliability, specifically including: a robust structural design: the base provides stable support, and the precise connection of the spindle and connecting rod enhances the overall device's resistance to vibration and deformation, making it suitable for various working conditions. A snap-fit ​​design: the combination of slots and clips provides reliable probe fixation, preventing data distortion due to probe loosening or displacement during calibration, thus improving calibration repeatability and stability. Standardized connection: a universal snap-fit ​​method adapts to different models of side-slip angle sensors, ensuring the fixture's versatility and long-term reliability.

[0040] This side-slip angle sensor calibration fixture features a modular design for easy assembly and disassembly, with modular connecting and snap-fit ​​parts that facilitate quick installation and removal, reducing the complexity of sensor calibration. The integrated calibration fixture combines angle reference generation, transmission, and sensor fixation into a single unit, eliminating the need for additional tools and simplifying the calibration process. The easy-to-operate indexing dial features clear markings and simple adjustments, reducing manual intervention time and improving work efficiency.

[0041] Therefore, this tooling combines mechanical precision and ease of operation, ensuring high accuracy and reliability in complex calibration tasks while reducing the difficulty and error of manual operation, providing an efficient and stable solution for the calibration of sideslip angle sensors in practical use.

[0042] The zero-pressure sideslip angle sensor calibration fixture, through precise mechanical design and calibration process, provides a high-precision, stable, and convenient calibration method for sensors. Sensor calibration methods based on this fixture include:

[0043] 1. Installation and initial alignment

[0044] Fixture fixing: Securely install the base of the calibration fixture onto the calibration platform to ensure its levelness and stability.

[0045] Sensor installation: Use the connecting rod snap-fit ​​part in the tooling to firmly connect the zero-pressure side slip angle sensor to the tooling probe, ensuring that the sensor is aligned with the spindle.

[0046] Initial alignment: Quickly adjust the angle of the indexing plate using the coarse adjustment knob to make the approximate direction of the sensor consistent with the reference, reducing subsequent adjustment time.

[0047] 2. Reference Angle Generation

[0048] Graduation adjustment: Use the scale of the graduations to generate preset reference angles. For example, set standard angles such as 0°, 10°, and 20° for calibration.

[0049] Precise fine-tuning: Adjust the indexing plate to the target angle using the fine-tuning screw and fine-tuning knob to ensure high precision in angle setting.

[0050] Locking Angle: After adjustment, use coarse and fine locking parts to fix the indexing plate and spindle to ensure the stability of the tooling angle.

[0051] 3. Data Acquisition and Sensor Calibration

[0052] Zero-point calibration: With the scale set to 0°, record the initial output value of the sensor and correct for zero-pressure deviation. If the sensor has a deviation at 0°, perform zero-point compensation using a computer calibration system.

[0053] Angle calibration: Gradually adjust the scale to different angles (e.g., ±10°, ±20°, etc.) and record the sensor output value corresponding to each angle. Compare the output value with the actual angle of the scale to generate a calibration curve or calibration table for the sensor.

[0054] Repeated verification: Repeatedly adjust the scale to the same angle to check the repeatability of the sensor and ensure that its calibration results are stable and reliable.

[0055] 4. Calibration error correction

[0056] Nonlinear error compensation: If there is a nonlinear error between the sensor output and the actual angle, a compensation formula is generated using the data fitting function (such as polynomial fitting) in the calibration system.

[0057] Temperature compensation: If the sensor is susceptible to the influence of ambient temperature, it can be repeatedly calibrated under different temperature conditions to establish a model of the relationship between temperature and error, and then real-time compensation can be applied.

[0058] 5. Saving and exporting calibration results

[0059] Parameter storage: The corrected zero point, linear compensation coefficient and other parameters are written into the sensor’s internal memory for subsequent automatic correction.

[0060] Report Export: Generates a calibration report, including angle reference values, sensor output values, compensation data, and calibration accuracy assessment, as a complete record of the calibration.

[0061] The beneficial effects of using this calibration fixture and calibration method are as follows:

[0062] High precision: The tooling provides a precise angle reference through the indexing plate and fine-tuning screw, ensuring calibration accuracy; Efficiency: The combination of coarse and fine adjustments makes the calibration process fast and efficient; High reliability: The tooling design ensures that the sensor is stable and secure during calibration, without loosening or error accumulation; Repeatability: The results of multiple calibrations are consistent and can meet high industrial standards.

[0063] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

[0064] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A calibration fixture for a zero-pressure sideslip angle sensor, characterized in that, include: Angle divider and connecting rod; The angle divider includes a main shaft, an indexing plate, and a base. The indexing plate and the base are respectively provided with a first through hole and a second through hole on their central axes. The connecting rod passes through the first through hole and the second through hole and is fixedly connected to the main shaft. The diameter of the first through hole and the second through hole is larger than the diameter of the connecting rod. The connecting rod does not contact the indexing plate and the base. The connecting rod includes a connecting part and a snap-fit ​​part. One end of the snap-fit ​​part is provided with a slot and a card. The card passes through the slot and snaps into the probe of the side slip angle sensor. The latching part has a groove on the side near the probe. The latching groove includes a first latching groove and a second latching groove. Both the first latching groove and the second latching groove are parallel to the axial direction of the latching part. The first latching groove and the second latching groove penetrate the outer wall of the latching part and extend to the bottom of the groove.

2. The zero-pressure sideslip angle sensor calibration fixture as described in claim 1, characterized in that, The main shaft is detachably connected to the indexing plate, the indexing plate is rotatably connected to the base, and the central axes of the main shaft, the indexing plate, and the base coincide.

3. The zero-pressure sideslip angle sensor calibration fixture as described in claim 2, characterized in that, The indexing plate is provided with a coarse adjustment knob, which is located on the side wall of the indexing plate. The base is provided with a coarse adjustment locking component, which is located on the side wall of the base.

4. The zero-pressure sideslip angle sensor calibration fixture as described in claim 3, characterized in that, The angle division instrument also includes a fine adjustment lead screw, which is located on the side away from the coarse adjustment locking member. The fine adjustment lead screw includes a fine adjustment knob and a fine adjustment locking member, which are respectively located at both ends of the fine adjustment lead screw. The fine adjustment lead screw is rotatably connected to the indexing plate.

5. The zero-pressure sideslip angle sensor calibration fixture as described in claim 1, characterized in that, The zero-pressure sideslip angle sensor calibration fixture also includes a mounting frame, which includes a first mounting plate, a second mounting plate, and a base plate arranged in parallel from top to bottom. The base is detachably connected to the first mounting plate. The first mounting plate is provided with a third through hole, through which the connecting rod passes. The second mounting plate is detachably connected to the sideslip angle sensor.

6. The zero-pressure sideslip angle sensor calibration fixture as described in claim 5, characterized in that, A set of support columns is provided between the second mounting plate and the base plate. The support columns are detachably connected to the second mounting plate. A set of foot pads is provided at one end of the base plate near the ground.

7. The zero-pressure sideslip angle sensor calibration fixture as described in claim 1, characterized in that, One end of the connecting part is fixedly connected to the main shaft, and the other end is fixedly connected to the snap-fit ​​part. The snap-fit ​​part has a groove on the side near the probe, and the width of the groove near the connecting part is smaller than the width of the groove away from the connecting part.

8. The zero-pressure sideslip angle sensor calibration fixture as described in claim 7, characterized in that, The first card slot contains a set of first cards, the length of which is less than the length of the first card slot, and the first cards are slidably connected to the first card slot; the second card slot contains a set of second cards, the second cards are slidably connected to the second card slot, and both the first cards and the second cards are engaged with the air inlet on the probe.

9. The zero-pressure sideslip angle sensor calibration fixture as described in claim 8, characterized in that, The first card and the second card are respectively provided with a first card hole and a second card hole, and both the first card hole and the second card hole are located at one end near the connecting part.

Images