Loading load measuring device and method for undercarriage static force / fatigue test

Abstract

The invention discloses a loading load measuring device and measuring method for undercarriage static force / fatigue test, in the device, a fixing plate is fixedly connected to a ground rail through bolts, one end of each small-range load sensor is fixedly connected to the fixing plate through bolts, and the other end of each small-range load sensor is fixedly connected to a mounting plate through bolts; the loading base is fixedly mounted on the mounting plate through bolts, the bottom end of the hydraulic actuating cylinder is hinged to the loading base through bolts, and the top end of the hydraulic actuating cylinder is hinged to the undercarriage false wheel through bolts; the loading load measuring device is used for applying a vertical load to the undercarriage false wheel through the hydraulic actuator cylinder and measuring the vertical load transmitted by the loading base and the mounting plate through a plurality of small-range load sensors; the load borne by the undercarriage false wheel in the test process is monitored and dynamically adjusted through the load measurement values of the small-range load sensors, and it is ensured that the load and the loading load required by the test are within the error range.

Description

Technical Field

[0001] The present invention relates to, but is not limited to, the technical field of static / fatigue tests for aircraft landing gears, and particularly refers to a loading load measuring device and a measuring method for static / fatigue tests of landing gears. Background Art

[0002] In the static / fatigue test of an aircraft landing gear, the magnitude of the loading load of the landing gear is fed back by sensors. When the error is greater than a certain value, it is necessary to stop the machine for inspection.

[0003] The loading load in the static / fatigue test of the landing gear is very large. It is difficult to find a load sensor with a corresponding range. The load sensor with a larger range not only has a high cost but also a large error, resulting in an over-sized or under-sized test loading load. In severe cases, it may cause the landing gear to be damaged and result in incorrect test results. Summary of the Invention

[0004] The object of the present invention is to provide a loading load measuring device and a measuring method for static / fatigue tests of landing gears to solve the problems that in the existing static / fatigue tests of landing gears, the load sensors with a large range have a high cost and a large error, resulting in an over-sized or under-sized test loading load, and in severe cases, it may cause the landing gear to be damaged and result in incorrect test results.

[0005] The technical solution of the present invention is: The present invention provides a loading load measuring device for static / fatigue tests of landing gears, including: a landing gear dummy wheel 1, a hydraulic actuator 2, a loading base 3, a mounting plate 4, a plurality of small-range load sensors 5, a fixing plate 6, a ground rail 7, and bolts 8; Wherein, the fixing plate 6 is fixedly connected to the ground rail 7 by bolts 8. One end of each small-range load sensor 5 is fixedly connected to the fixing plate 6 by bolts 8, and the other end is fixedly connected to the mounting plate 4 by bolts 8. The loading base 3 is fixedly installed on the mounting plate 4 by bolts 8. The bottom end of the hydraulic actuator 2 is hinged to the loading base 3 by bolts 8, and the top end is hinged to the landing gear dummy wheel 1 by bolts 8; The loading load measuring device is used to apply a vertical load to the landing gear dummy wheel 1 through the hydraulic actuator 2 and measure the vertical load transmitted through the loading base 3 and the mounting plate 4 by a plurality of small-range load sensors 5, so as to monitor and dynamically adjust the load borne by the landing gear dummy wheel 1 during the test through the load measurement values of the plurality of small-range load sensors 5, and ensure that it is within the error range of the required loading load for the test.

[0006] Optionally, in the loading load measuring device for static / fatigue tests of landing gears as described above, The number of the small-range load sensors 5 is determined according to the maximum load value of the static / fatigue test and the range of the small-range load sensors 5 used, and the number is an even number greater than or equal to 4.

[0007] Optionally, in the loading load measuring device for the static / fatigue test of the landing gear as described above, The loading base 3 is installed at the central position of the mounting plate 4; The multiple small-range load sensors 5 are symmetrically arranged and installed on the mounting plate 4.

[0008] Optionally, in the loading load measuring device for the static / fatigue test of the landing gear as described above, A ball bearing is nested in the central hole of the connecting lug of the loading base 3. The bolt 8 passes through the double ears of the hydraulic actuator 2 and the ball bearing, so as to connect the loading base 3 and the hydraulic actuator 2, so as to bear the load in the axial direction of the connecting lug hole during the test through the ball bearing, that is, the lateral additional load. It is required that the axial direction of the connecting lug hole is consistent with the lateral direction when the loading base 3 is installed.

[0009] In a second aspect, an embodiment of the present invention further provides a measurement method for the static / fatigue test of the landing gear. The loading load is measured during the static / fatigue test of the landing gear by using the loading load measuring device as described in any one of the above. The method includes: Step 1, connect the landing gear dummy wheel 1 by using the loading load measuring device, and the top of the landing gear dummy wheel 1 is fixedly installed on the landing gear; Step 2, apply a vertical load to the landing gear dummy wheel 1 through the hydraulic actuator 2 to perform a static test or a fatigue test; Step 3, during the load loading process of the static test or the fatigue test, measure the vertical load transmitted through the loading base 3 and the mounting plate 4 by using the multiple small-range load sensors 5; Step 4, monitor the vertical load borne by the landing gear dummy wheel 1 during the test through the vertical load values measured by the multiple small-range load sensors 5 and dynamically adjust it to ensure that it is within the error range of the required loading load for the test.

[0010] Optionally, in the measurement method for the static / fatigue test of the landing gear as described above, the step 4 includes: Perform a summation calculation on the vertical load values measured by the multiple small-range load sensors 5, that is, obtain the vertical load borne by the landing gear dummy wheel 1.

[0011] Optionally, in the measurement method for the static / fatigue test of the landing gear as described above, it further includes: Step 5: Calculate the additional yaw load and lateral additional load caused by loading deformation of the landing gear during the test by using the vertical loads measured by all small-range load sensors 5 and the relative positions of all small-range sensors 5, so as to evaluate the influence of the additional load on the strength of the landing gear.

[0012] Optionally, in the measurement method for the static / fatigue test of the landing gear as described above, the calculation methods for the additional yaw load and lateral additional load in the above steps are as follows: Take the geometric center of the mounting plate 4 as the origin, use the two symmetric centerlines of the mounting plate 4 as the x-direction and y-direction respectively, and determine the Z-direction according to the left-hand rule to establish a coordinate system; Obtain the coordinate values Lxi and Lyi of each small-range load sensor 5 relative to the origin, and the vertical distance L from the center hole of the connecting lug of the loading base 3 to the thickness center of the mounting plate 4; According to the Z-direction loads Fzi measured by each small-range load sensor 5, the coordinate values Lxi and Lyi of each small-range load sensor 5, and the vertical distance L, calculate the additional yaw load Fx and lateral additional load Fy of the dummy wheel 1 of the landing gear as follows: .

[0013] The beneficial effects of the present invention are as follows: The present invention provides a loading load measurement device and a measurement method for the static / fatigue test of the landing gear. By using the measurement values of multiple small-range load sensors 5, the true feedback value of the large load in the landing gear test can be obtained through calculation. By adopting the loading load measurement device provided by the present invention, on the one hand, there is no need to purchase new large-range load sensors, which reduces the test cost; on the other hand, by flexibly combining the characteristics of high precision of multiple small-range load sensors 5, the large load can be decomposed into multiple small loads for measurement, which improves the test accuracy and the accuracy of the loading load; on the other hand, the additional load outside the main loading direction can be obtained by arranging multiple small-range load sensors 5, which is used to accurately evaluate the mechanical properties of the landing gear. In addition, the structure of the loading load measurement device provided by the present invention is simple, easy to maintain, and has high reliability. Description of the Drawings

[0014] The drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

[0015] Figure 1 It is a schematic structural diagram of the loading load measurement device for the static / fatigue test of the landing gear provided by the embodiment of the present invention.

[0016] Description of the Reference Numerals: Landing gear dummy wheel 1, hydraulic actuator 2, loading base 3, mounting plate 4, small-range load sensor 5, fixing plate 6, ground rail 7, bolt 8. Detailed implementation manners

[0017] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0018] As described in the above background art, there are problems in the measurement of the loading load in the static / fatigue test of the aircraft landing gear, that is, using a large-range sensor not only has a high cost but also a large error, resulting in the test loading load being too large or too small. Seriously, it may cause the landing gear to be damaged and result in incorrect test results. Further, when the landing gear is under a large load, it deforms, resulting in the deviation of the loading direction of the load from the requirement, and the load borne by the landing gear deviates from the loading load required by the test, resulting in the deviation of the test results from the actual use situation.

[0019] To solve the above problems, there is an urgent need for a loading load measurement method in the static / fatigue test of the aircraft landing gear. The present invention provides a loading load measurement device and a measurement method for the static / fatigue test of the landing gear. By combining multiple load sensors to measure the load, it is possible to measure a large load through multiple small-range load sensors 5, reducing the sensor procurement cost; using the advantage of the high precision of the small-range sensor 5 to avoid too large an error in the measured load, improving the test precision and the accuracy of the loading load; at the same time, by arranging multiple small-range load sensors 5, additional loads other than the main loading direction can be obtained, accurately evaluating the mechanical properties of the landing gear.

[0020] The present invention provides the following several specific embodiments that can be combined with each other. For the same or similar concepts or processes, they may not be repeated in some embodiments.

[0021] The first part, the embodiment of the present invention provides a loading load measurement device for the static / fatigue test of the landing gear.

[0022] Figure 1 FIG. is a schematic structural diagram of the loading load measurement device for the static / fatigue test of the landing gear provided by the embodiment of the present invention. The components of the loading load measurement device include: landing gear dummy wheel 1, hydraulic actuator 2, loading base 3, mounting plate 4, multiple small-range load sensors 5, fixing plate 6, ground rail 7 and bolt 8.

[0023] As Figure 1In the structure of the loading load measuring device shown, the fixed plate 6 is fixedly connected to the ground rail 7 by bolts 8. One end of each small-range load sensor 5 is fixedly connected to the fixed plate 6 by bolts 8, and the other end is fixedly connected to the mounting plate 4 by bolts 8. The loading base 3 is fixedly installed on the mounting plate 4 by bolts 8. The bottom end of the hydraulic actuator 2 is hinged to the loading base 3 by bolts 8, and the top end is hinged to the landing gear dummy wheel 1 by bolts 8.

[0024] Based on the structural form of the loading load measuring device provided by the embodiments of the present invention, its functions are as follows: applying a vertical load to the landing gear dummy wheel 1 through the hydraulic actuator 2, and measuring the vertical load transmitted through the loading base 3 and the mounting plate 4 by multiple small-range load sensors 5, so as to monitor and dynamically adjust the load borne by the landing gear dummy wheel 1 during the test through the load measurement values of the multiple small-range load sensors 5, and ensure that the load is within the error range of the required loading load in the test.

[0025] In one implementation manner of the embodiments of the present invention, the number of small-range load sensors 5 is determined according to the maximum load value of the static / fatigue test and the range of the small-range load sensors 5 used, and the number is more than 4 and an even number.

[0026] In one implementation manner of the embodiments of the present invention, the loading base 3 is installed at the central position of the mounting plate 4; correspondingly, multiple small-range load sensors 5 are symmetrically arranged and installed on the mounting plate 4.

[0027] In one implementation manner of the embodiments of the present invention, a ball bearing is embedded in the central hole of the connecting lug of the loading base 3. The bolts 8 pass through the double ears of the hydraulic actuator 2 and the ball bearing, thereby connecting the loading base 3 and the hydraulic actuator 2, so as to bear the load in the axial direction of the connecting lug hole during the test through the ball bearing.

[0028] It should be noted that in this implementation manner, it is required that the ball bearing bears the lateral additional load, and correspondingly, the installation requires that the axial direction of the connecting lug hole of the loading base 3 is consistent with the lateral direction during installation.

[0029] Second, the embodiments of the present invention also provide a measurement method for the static / fatigue test of the landing gear.

[0030] The measurement method provided by the embodiments of the present invention measures the loading load in the static / fatigue test of the landing gear by using the loading load measuring device provided in any of the above embodiments. The method includes: Step 1, connecting the landing gear dummy wheel 1 by using the loading load measuring device, and fixedly installing the top of the landing gear dummy wheel 1 on the landing gear; Step 2, applying a vertical load to the landing gear dummy wheel 1 through the hydraulic actuator 2 to perform the static / fatigue test; Step 3, during the load application process of the static / fatigue test, measure the vertical load transmitted through the loading base 3 and the mounting plate 4 by multiple small-range load sensors 5; Step 4, monitor and dynamically adjust the load borne by the landing gear dummy wheel 1 during the test through the vertical load values measured by multiple small-range load sensors 5 to ensure that it is within the error range of the required loading load for the test. Calculate the sum of the vertical load values measured by multiple small-range load sensors 5, and the vertical load borne by the landing gear dummy wheel 1 can be obtained; Step 5, use the vertical loads measured by all small-range load sensors 5 and the relative positions of all small-range sensors 5 to calculate the additional heading load and lateral additional load caused by the loading deformation of the landing gear during the test, so as to evaluate the influence of the additional load on the strength of the landing gear.

[0031] In the embodiment of the present invention, taking the geometric center of the mounting plate 4 as the origin, taking the two symmetric centerlines of the mounting plate 4 as the x-direction and the y-direction respectively, and determining the z-direction according to the left-hand rule to establish a coordinate system, where the positive direction of the x-direction is to the right, the positive direction of the y-direction is backward, and the positive direction of the z-direction is upward. Obtain the coordinate values Lxi and Lyi of each small-range load sensor 5 relative to the origin, and the vertical distance L from the center hole of the connecting lug of the loading base 3 to the center of the thickness of the mounting plate 4.

[0032] According to the z-direction load Fzi measured by each small-range load sensor 5, the coordinate values Lxi, Lyi of each small-range load sensor 5, and the vertical distance L, calculate the additional heading load Fx and lateral additional load Fy of the landing gear dummy wheel 1 as: .

[0033] The present invention provides a loading load measuring device and measuring method for the static / fatigue test of a landing gear. By using the measured values of multiple small-range load sensors 5, the true feedback value of the large load in the landing gear test can be obtained through calculation. By adopting the loading load measuring device provided by the present invention, on the one hand, there is no need to purchase new large-range load sensors, which reduces the test cost; on the other hand, by flexibly combining the characteristics of high precision of multiple small-range load sensors 5, the large load can be decomposed into multiple small loads for measurement, which improves the test precision and the accuracy of the loading load; on the other hand, the additional load outside the main loading direction can be obtained by arranging multiple small-range load sensors 5, which is used to accurately evaluate the mechanical properties of the landing gear. In addition, the structure of the loading load measuring device provided by the present invention is simple, easy to maintain, and has high reliability.

[0034] The following is a schematic illustration of the implementation manner of a loading load measuring device and measuring method for the static / fatigue test of a landing gear provided by the present invention through an implementation example.

[0035] Implementation Example In the loading load measuring device in this embodiment, according to the maximum test load of 178 KN and the range of the small-range load sensor 5 being 50 KN, 4 small-range load sensors 5 are selected to measure the test load, and the maximum test load accounts for 89% of the total range of the load sensor 5. The load values measured by the 4 small-range load sensors 5 in the test are respectively: 44.841 KN, 44.716 KN, 44.463 KN, 43.526 KN. Assuming that the X-direction coordinate values of the 4 small-range load sensors 5 relative to the coordinate origin are respectively: 120 mm, 120 mm, -120 mm, -120 mm, and the Y-direction coordinate values are respectively: 160 mm, 160 mm, -160 mm, -160 mm, the vertical distance from the center hole of the connecting lug of the loading base 3 to the thickness center of the mounting plate 4 is 150 mm.

[0036] Sum up the vertical load values measured by the small-range load sensors 5 to obtain the vertical load borne by the landing gear dummy wheel 1 as 177.546 KN, with an error of 0.26%. According to the load values measured by each small-range load sensor 5 and the relative positions of the small-range load sensors 5, the heading additional load is obtained as -0.650 KN, and the lateral additional load is obtained as -1.673 KN.

[0037] Although the disclosed embodiments of the present invention are as above, the content is only an embodiment adopted for the convenience of understanding the present invention and is not used to limit the present invention. Any person skilled in the art within the scope of the present invention can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A loading load measuring device for static / fatigue tests of landing gears, characterized in that, Comprising: A landing gear dummy wheel (1), a hydraulic actuator (2), a loading base (3), a mounting plate (4), a plurality of small-range load sensors (5), a fixing plate (6), a ground rail (7) and bolts (8); Wherein, the fixing plate (6) is fixedly connected to the ground rail (7) by bolts (8). One end of each small-range load sensor (5) is fixedly connected to the fixing plate (6) by bolts (8), and the other end is fixedly connected to the mounting plate (4) by bolts (8). The loading base (3) is fixedly installed on the mounting plate (4) by bolts (8). The bottom end of the hydraulic actuator (2) is hinged to the loading base (3) by bolts (8), and the top end is hinged to the landing gear dummy wheel (1) by bolts (8); The loading load measuring device is used to apply a vertical load to the landing gear dummy wheel (1) through the hydraulic actuator (2), and measure the vertical load transmitted through the loading base (3) and the mounting plate (4) by a plurality of small-range load sensors (5), so as to monitor and dynamically adjust the load borne by the landing gear dummy wheel (1) during the test through the load measurement values of the plurality of small-range load sensors (5), and ensure that it is within the error range of the required loading load for the test.

2. The loading load measuring device for static / fatigue test of landing gear according to claim 1, wherein The number of the small-range load sensors (5) is determined according to the maximum load value of the static / fatigue test and the range of the small-range load sensors (5) used, and the number is an even number of 4 or more.

3. The loading load measuring device for static / fatigue test of landing gear according to claim 1, wherein The loading base (3) is installed at the central position of the mounting plate (4); The plurality of small-range load sensors (5) are symmetrically arranged and installed on the mounting plate (4) about the center.

4. The loading load measuring device for static / fatigue test of landing gear according to claim 1, wherein A ball bearing is nested in the central hole of the connecting lug of the loading base (3). Bolts (8) pass through the double ears of the hydraulic actuator (2) and the ball bearing, so as to connect the loading base (3) and the hydraulic actuator (2), so as to bear the load in the axial direction of the connecting lug hole during the test through the ball bearing.

5. A measurement method for static / fatigue tests of landing gears, characterized in that, When measuring the loading load by using the loading load measuring device for static / fatigue test of landing gear as described in any one of claims 1 to 4, the method includes: Step 1, connecting the landing gear dummy wheel (1) by using the loading load measuring device, and fixedly installing the top of the landing gear dummy wheel (1) on the landing gear; Step 2, applying a vertical load to the landing gear dummy wheel (1) through the hydraulic actuator (2) to perform a static test or a fatigue test; Step 3, during the load loading process of the static test or the fatigue test, measuring the vertical load transmitted through the loading base (3) and the mounting plate (4) by a plurality of small-range load sensors (5); Step 4, monitoring and dynamically adjusting the load borne by the landing gear dummy wheel (1) during the test through the vertical load values measured by the plurality of small-range load sensors (5).

6. The measurement method for static / fatigue tests of landing gears according to claim 5, characterized in that, Said step 4 includes: Sum up the vertical load values measured by multiple small-range load sensors (5), and the vertical load borne by the false wheel (1) of the landing gear can be obtained.

7. The measuring method for the static / fatigue test of the landing gear according to claim 5, characterized in that It further includes: Step 5: Calculate the additional yaw load and additional lateral load caused by loading deformation during the test of the landing gear by using the vertical loads measured by all small-range load sensors (5) and the relative positions of all small-range load sensors (5), so as to evaluate the influence of the additional load on the strength of the landing gear.

8. The measuring method for static / fatigue test of landing gear according to claim 7, characterized in that, The calculation methods of the additional yaw load and additional lateral load in the above step are as follows: Taking the geometric center of the mounting plate (4) as the origin, taking the two symmetric center lines of the mounting plate (4) as the x-direction and y-direction respectively, and determining the Z-direction according to the left-hand rule to establish a coordinate system; Obtain the coordinate values Lxi and Lyi of each small-range load sensor (5) relative to the origin, and the vertical distance L from the center hole of the connecting lug of the loading base (3) to the thickness center of the mounting plate (4); According to the Z-direction load Fzi measured by each small-range load sensor (5), the coordinate values Lxi and Lyi of each small-range load sensor (5), and the vertical distance L, calculate the additional yaw load Fx and additional lateral load Fy of the false wheel (1) of the landing gear: 。

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