Propeller fairing acceleration test device

Abstract

The invention relates to the technical field of acceleration test equipment, in particular to a propeller fairing acceleration test device, which comprises a fixed seat and a mounting seat, and is characterized in that the fixed seat is used for being connected with an acceleration test bed; the mounting seat is arranged on the fixing seat and comprises a bottom plate, a top plate and a supporting column, the lower end of the supporting column is connected with the bottom plate, the upper end of the supporting column is connected with the top plate, the bottom plate is used for being connected with a chassis of the fairing, and the top plate is used for being connected with an inner disc of the fairing. According to the propeller fairing acceleration test device, through the structure of the fixing seat and the mounting seat, reliable connection between the fairing and the test bench is realized, and the stress state under the real use working condition is precisely restored; by additionally arranging the elastic cushion, the pressure sensor, the rib plate and other assemblies, the problems of rigid damage, stress concentration, data distortion and the like of a traditional device are solved, and the universality, stability and reliability of the device are improved.

Description

Technical Field

[0001] This application relates to the field of acceleration testing equipment technology, and in particular to a propeller fairing acceleration testing device. Background Technology

[0002] As a critical aerodynamic component of an aircraft, the propeller fairing must withstand the acceleration overload generated by maneuvers during flight, and its structural strength is directly related to flight safety. According to the relevant requirements of GJB 150A standards, the propeller fairing must undergo an acceleration test before leaving the factory to verify whether its strength meets the usage requirements.

[0003] In existing technologies, propeller fairings are mostly thin-walled composite material structures. Traditional acceleration testing devices suffer from the following drawbacks: First, the installation structure design is unreasonable, failing to accurately reproduce the actual connection state between the fairing and the propeller casing, leading to distorted test load transmission paths and low reliability of verification results. Second, there is a lack of pressure monitoring mechanisms at the fairing connection points, making it difficult to detect localized stress concentrations and comprehensively assess structural strength. Third, rigid connection methods are prone to causing extrusion damage to the thin-walled composite structure and have poor adaptability, making it difficult to meet the testing requirements of fairings of different specifications. Therefore, there is an urgent need to design a propeller fairing acceleration testing device with a reasonable structure, accurate testing, and strong adaptability. Summary of the Invention

[0004] This application provides a propeller fairing acceleration testing device. By optimizing the installation structure, adding monitoring components and buffer structures, it achieves precise matching between the test conditions and the actual use conditions, improves the accuracy and reliability of the test data, and protects the composite thin-walled structure from damage.

[0005] This application provides a propeller fairing acceleration testing device, comprising:

[0006] Mounting bracket for connection to acceleration test bench;

[0007] The mounting base is set on the fixed base. The mounting base includes a base plate, a top plate and a support column. The lower end of the support column is connected to the base plate and the upper end of the support column is connected to the top plate. The base plate is used to connect to the chassis of the fairing and the top plate is used to connect to the inner plate of the fairing.

[0008] In one possible design, the base plate is circular, with a diameter larger than that of the central hole of the fairing's chassis. Multiple mounting holes are evenly distributed near the edge of the base plate, and the edge of the base plate connects to the central hole of the fairing's chassis.

[0009] In one possible design, the top plate is in the shape of a stepped column, comprising an upper section with a smaller diameter and a lower section with a larger diameter. The diameter of the upper section is smaller than the diameter of the central hole of the inner disk of the fairing, and the diameter of the lower section is larger than the diameter of the central hole of the inner disk of the fairing. The upper section extends upward from the central hole of the inner disk of the fairing.

[0010] In one possible design, elastic pads are provided on the outer wall of the upper section and the upper end face of the lower section.

[0011] In one possible design, multiple pressure sensors are arranged circumferentially between the outer wall of the upper section and the elastic pad, which are used to collect pressure values ​​at different locations on the outer wall of the upper section.

[0012] In one possible design, the sidewalls of the support column are provided with side ribs along their radial direction.

[0013] In one possible design, the mounting base includes a fixed plate and a vertical plate. The fixed plate is used to connect to the acceleration test bench, the lower end of the vertical plate is connected to the fixed plate, and the upper end of the vertical plate is connected to the base plate.

[0014] In one possible design, the mounting base also includes reinforcing ribs, which are located on the outside of the upright plate and perpendicular to both the upright plate and the mounting plate.

[0015] In one possible design, the mounting plate has multiple mounting holes.

[0016] The beneficial effects of this application are as follows:

[0017] The propeller fairing acceleration test device of this application achieves a reliable connection between the fairing and the test bench through the structure of the fixed base and the mounting base, accurately restoring the stress state under real use conditions; by adding components such as elastic pads, pressure sensors, and ribs, it not only solves the problems of rigid damage, stress concentration, and data distortion of traditional devices, but also improves the versatility, stability and reliability of the device. Attached Figure Description

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

[0019] Figure 1 This is a schematic diagram of the propeller fairing acceleration test device provided in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the internal structure of the propeller fairing;

[0021] Figure 3 The installation state of the propeller fairing acceleration test device provided in the embodiments of this application. Figure 1 ;

[0022] Figure 4 The installation state of the propeller fairing acceleration test device provided in the embodiments of this application. Figure 2 .

[0023] Figure label:

[0024] 01. Cover; 02. Chassis; 03. Inner plate; 100. Mounting base; 110. Base plate; 111. Mounting hole; 120. Top plate; 121. Upper section; 122. Lower section; 130. Support column; 131. Side rib plate; 200. Fixing base; 210. Fixing plate; 211. Fixing hole; 220. Vertical plate; 230. Reinforcing rib plate. Detailed Implementation

[0025] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The following is combined Figures 1-4 This application describes the propeller fairing acceleration test device provided in the embodiments of this application.

[0027] Reference Figure 2 As shown, the propeller fairing includes a chassis 02, an inner disk 03, and a fairing body 01, with the fairing body 01 covering the outside of the chassis 02 and the inner disk 03.

[0028] Reference Figure 1 , Figure 3 and Figure 4As shown, the propeller fairing acceleration test device includes a fixed base 200 and a mounting base 100. The fixed base 200 is used to achieve a stable connection with the acceleration test bench, providing reliable support for the entire test device and ensuring that the device as a whole does not shift or shake during the test, thus guaranteeing test stability. The mounting base 100 is set on the fixed base 200, forming a docking structure with the fairing. It specifically includes a base plate 110, a top plate 120, and a support column 130. The lower end of the support column 130 is welded and fixed to the base plate 110, and the upper end of the support column 130 is integrally formed with the top plate 120, resulting in high connection strength and effective transmission of test load. The base plate 110 is used for close contact with the base plate 02 of the fairing, and the top plate 120 is used for positioning connection with the inner plate 03 of the fairing. In this way, the fairing chassis 02 and inner chassis 03 are fixed at two points, accurately restoring the actual connection method between the fairing and the propeller casing, ensuring that the test load transmission path is consistent with the real working conditions, and solving the problem of unreliable verification results caused by the distortion of the connection method of traditional devices; at the same time, the overall structure is simple and easy to assemble, providing a basic guarantee for the smooth conduct of subsequent tests.

[0029] In some specific embodiments, the base plate 110 is circular, and its diameter is larger than the diameter of the central hole of the fairing chassis 02. This ensures that the edge of the base plate 110 completely covers the area surrounding the central hole of the fairing chassis 02, providing sufficient contact area for connection. Multiple mounting holes 111 are evenly distributed near the edge of the base plate 110. Bolts are fitted into the mounting holes 111 to securely connect the edge of the base plate 110 to the central hole of the fairing chassis 02. The circular base plate 110 design is highly compatible with the structure of the central hole of the fairing chassis 02. The larger diameter ensures sufficient contact area during connection, preventing excessive local pressure from damaging the thin wall of the composite material. The evenly distributed mounting holes 111 evenly distribute the connection force, further improving connection stability and preventing relative displacement between the fairing and the base plate 110 during testing, thus ensuring the accuracy of test data.

[0030] In some specific embodiments, the top plate 120 is in the shape of a stepped column. The top plate 120 includes an upper section 121 with a smaller diameter and a lower section 122 with a larger diameter. The diameter of the upper section 121 is smaller than the diameter of the central hole of the inner disk 03 of the fairing, while the diameter of the lower section 122 is larger than the diameter of the central hole of the inner disk 03. During assembly, the upper section 121 extends upwards from the central hole of the inner disk 03, while the lower section 122 forms a limiting support with the lower end face of the inner disk 03. The stepped columnar top plate 120, through the design of "upper section 121 through, lower section 122 limiting," achieves precise positioning of the inner disk 03 of the fairing. The upper section 121 through the central hole limits the radial displacement of the fairing, while the lower section 122, in contact with the lower end face of the inner disk 03, limits axial displacement. This dual limiting ensures the stability of the fairing's position during testing. Simultaneously, this structure is adaptable to inner disks 03 of different thicknesses, improving the versatility of the device.

[0031] In some specific embodiments, the outer wall of the upper section 121 is wrapped with an elastic pad made of silicone, and the upper end face of the lower section 122 is bonded with an elastic pad made of rubber. The thickness of the elastic pad is 3-5 mm, and the hardness is Shore 60-70 HA. The elastic pad enables flexible contact between the mounting base 100 and the fairing, avoiding the squeezing damage to the thin-walled composite structure caused by rigid connection, and playing a buffering and protective role. At the same time, the elastic pad can compensate for minor deviations during installation, making the contact pressure more uniform, reducing local stress concentration, and absorbing high-frequency vibrations during the test, reducing the interference of vibration on the test data.

[0032] In some specific embodiments, four miniature pressure sensors are uniformly embedded circumferentially between the outer wall of the upper section 121 and the elastic pad. These sensors have an accuracy of ±0.01 MPa and are connected to an external data acquisition system via wires, enabling real-time acquisition of pressure values ​​at different locations on the outer wall of the upper section 121. The multiple circumferentially distributed pressure sensors can collect pressure values ​​from different locations in real time, comprehensively monitoring the contact pressure distribution between the inner disk 03 and the top plate 120 of the fairing. This allows for timely detection of localized stress concentration issues, providing more comprehensive data support for assessing the structural strength of the fairing. Compared to traditional methods without monitoring devices, this effectively avoids misjudgments of test results due to undetected stress concentration, improving the reliability of the test.

[0033] In some specific embodiments, the support column 130 is made of No. 45 steel, and its sidewalls are uniformly welded with four side ribs 131 along the radial direction. The side ribs 131 have a triangular structure and a thickness of 8mm, and are fully welded to the support column 130 and the base plate 110. The side ribs 131 on the sidewalls of the support column 130 can significantly improve the bending stiffness and torsional strength of the support column 130, prevent the support column 130 from deforming due to acceleration loads during the test, and ensure the structural stability of the mounting base 100. At the same time, the side ribs 131 can distribute the force on the support column 130, extend the service life of the device, and meet the needs of long-term repeated tests.

[0034] In some specific embodiments, the mounting base 200 includes a fixing plate 210 and a vertical plate 220. The fixing plate 210 is a rectangular steel plate with a thickness of 15mm, used to fit against the surface of the acceleration test bench. The vertical plate 220 consists of four rectangular steel plates arranged in a rectangular pattern. The lower end of the vertical plate 220 is welded to the fixing plate 210, and the upper end of the vertical plate 220 is welded to the lower surface of the base plate 110, forming a stable frame support structure. The mounting base 200, composed of the fixing plate 210 and the vertical plate 220, forms a stable frame structure. The fixing plate 210 has a large contact area with the test bench, resulting in a stable connection. The distribution design of the vertical plates 220 ensures that the force on the mounting base 100 is evenly transmitted to the test bench. This structure is reasonably designed, highly rigid, and can withstand overload loads during acceleration tests, preventing deformation of the mounting base 200 from affecting the test accuracy.

[0035] In some specific embodiments, the mounting base 200 further includes reinforcing ribs 230. Two reinforcing ribs 230 are provided on the outer side of each upright plate 220. The reinforcing ribs 230 are right-angled triangles and are welded perpendicularly to the upright plate 220 and the mounting plate 210, respectively. The welds are continuous, further enhancing the overall rigidity of the mounting base 200. The reinforcing ribs 230 are perpendicularly connected to the upright plate 220 and the mounting plate 210, forming a triangular stable structure, further improving the overall rigidity and deformation resistance of the mounting base 200, effectively dispersing the stress at the connection between the upright plate 220 and the mounting plate 210, and preventing weld cracking. Especially in high-acceleration load tests, this ensures the structural integrity of the mounting base 200, providing a guarantee for the safe operation of the testing device.

[0036] In some specific embodiments, the fixing plate 210 has multiple fixing holes 211. The fixing holes 211 are rectangularly distributed with a diameter of φ12mm, and are adapted to high-strength bolts. The fixing plate 210 is fastened to the platform of the acceleration test bench by bolts, ensuring that the connection strength meets the load requirements of the acceleration test. The multiple fixing holes 211 on the fixing plate 210 provide multiple sets of installation points for connection with the test bench. The fixing position can be flexibly adjusted according to the interface position of the test bench, improving the adaptability of the device. At the same time, the design of multiple fixing holes 211 makes the connection more secure, avoiding loosening of the connection due to excessive force on a single fixing point, ensuring no relative displacement between the device and the test bench during the test, and guaranteeing the stability and safety of the test.

[0037] The test steps of the propeller fairing acceleration test device provided in this application embodiment are as follows:

[0038] 1. Pre-experiment preparation stage

[0039] 1.1 Check the integrity of each component of the test device of the present invention, including the fixing plate 210, upright plate 220, and reinforcing rib 230 of the fixing base 200, the bottom plate 110, top plate 120, support column 130, and side rib 131 of the mounting base 100, as well as components such as elastic pads and pressure sensors, and confirm that there are no defects such as deformation, cracks, or loosening; check whether the wire connection of the pressure sensor is intact, whether the data acquisition system is operating normally, and whether the flatness of the acceleration test bench and the fixing interface are compatible.

[0040] 1.2 Fairing pretreatment: Perform a visual inspection on the propeller fairing to be tested to ensure that its surface is undamaged and that the center holes of the inner disk 03 and the base disk 02 are free of burrs; according to the size parameters of the fairing, confirm the compatibility of the mounting hole 111 of the base plate 110 and the diameter of the upper section 121 of the top plate 120 with the fairing, and replace the elastic pads of the corresponding specifications if necessary.

[0041] 1.3 Sensor Calibration: The pressure sensor is calibrated to ensure that the measurement accuracy meets the requirement of ±0.01MPa; the pressure sensor is connected to the data acquisition system, the data transmission stability is adjusted, and the pressure acquisition frequency is set to 100Hz to ensure that the real-time data acquisition is without delay or distortion.

[0042] 2. Assembly stage of the device and test bench:

[0043] 2.1 Installation of the mounting base 200: Attach the mounting plate 210 of the mounting base 200 to the surface of the acceleration test bench, aligning the mounting holes 211 on the mounting plate 210 with the pre-set mounting holes 111 on the test bench; pass the high-strength bolts through the mounting holes 211, and tighten the bolts with a torque wrench to a pre-tightening torque of 30 N·m, ensuring that there is no gap or relative displacement between the mounting plate 210 and the test bench surface.

[0044] 2.2 Mounting base 100 inspection: Confirm that the base plate 110, support column 130 and top plate 120 of mounting base 100 are firmly connected and that the welds of the side rib plate 131 are free of cracks; check whether the elastic pads on the outer side wall of the upper section 121 and the upper end face of the lower section 122 of the top plate 120 are tightly fitted and free of detachment, to ensure that the flexible contact structure is effective.

[0045] 3. Fairing and device assembly stage:

[0046] 3.1 Positioning and docking: Align the center hole of the fairing chassis 02 with the edge of the base plate 110 of the mounting base 100, and adjust the position of the fairing so that the chassis 02 and the base plate 110 are completely in contact; align the center hole of the fairing inner plate 03 with the upper section 121 of the top plate 120, and slowly lower the fairing so that the upper section 121 of the top plate 120 passes through the center hole of the inner plate 03 until the lower end face of the inner plate 03 is in close contact with the elastic pad on the upper end face of the lower section 122 of the top plate 120.

[0047] 3.2 Fastening connection: Pass the bolts through the mounting holes 111 on the edge of the base plate 110 and the corresponding connection holes of the fairing chassis 02, and tighten the bolts evenly (tightening sequence is clockwise alternately). The pre-tightening torque is controlled at 15 N·m to avoid excessive local stress that could damage the fairing. After assembly, check whether the fairing is stable and has no radial or axial looseness.

[0048] 3.3 Initial pressure monitoring: The initial pressure values ​​of each pressure sensor are read through the data acquisition system to ensure that the pressure values ​​in all directions are within a uniform range of 0.1-0.3MPa. If there is a pressure deviation, the position of the fairing or the bolt preload is adjusted until the pressure distribution is uniform.

[0049] 4. Test parameter setting and start-up phase:

[0050] 4.1 Parameter Configuration: According to the GJB150A standard and test requirements, set the test parameters of the acceleration test bench, including overload acceleration value (set according to the fairing design requirements, such as 5g, 8g, 10g gradients), test duration (each gradient condition lasts 10 minutes), and loading direction (simulating flight maneuvering direction, such as axial and radial).

[0051] 4.2 Safety Inspection: Check that there are no unauthorized personnel in the test area and that the protective devices are in place; reconfirm the connection status between the fixed base 200 and the test bench, and between the fairing and the device, and that the pressure sensor data transmission is normal and there are no abnormal alarms.

[0052] 4.3 Test Start-up: Start the acceleration test bench and gradually load according to the preset parameters, starting from a low acceleration gradient. After each gradient condition is completed, pause the test bench and record the pressure sensor data and fairing appearance under that condition.

[0053] 5. Experimental process monitoring and data recording stage:

[0054] 5.1 Real-time monitoring: During the test, the pressure changes of each pressure sensor were monitored in real time through the data acquisition system. The peak pressure and effective value of each position under different acceleration loads were recorded. The focus was on whether there were pressure abrupt changes (to determine whether stress concentration occurred). At the same time, the deformation of the fairing was observed through a high-speed camera, and whether any abnormalities such as cracks or detachment occurred were recorded.

[0055] 5.2 Emergency Handling: If the pressure value exceeds the safe range (greater than 5MPa), the fairing is obviously deformed, or the sensor signal is abnormal during the test, stop the test bench immediately, troubleshoot the fault, and then decide whether to continue the test.

[0056] 6. End of Experiment and Subsequent Stages:

[0057] 6.1 Unloading and Shutdown: Gradually reduce the acceleration load according to the preset program until the test bench stops completely to avoid structural impact caused by sudden unloading.

[0058] 6.2 Disassembly and Inspection: After the test bench comes to a stop, loosen the connecting bolts between the fairing and the base plate 110, slowly remove the fairing, and check whether there is any damage or deformation at the connection between the base plate 02 and the inner plate 03 of the fairing, and whether the elastic pad is intact.

[0059] 6.3 Data processing and analysis: Export the pressure data and acceleration load data from the data acquisition system, plot the pressure-acceleration relationship curve and the pressure distribution comparison diagram in each direction; combine the results of the fairing appearance inspection to evaluate whether its structural strength meets the usage requirements and generate a test report.

[0060] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A propeller fairing acceleration testing device, characterized in that, include: Mounted base for connection to acceleration test bench; The mounting base is disposed on the fixed base. The mounting base includes a base plate, a top plate, and a support column. The lower end of the support column is connected to the base plate, and the upper end of the support column is connected to the top plate. The base plate is used to connect to the chassis of the fairing, and the top plate is used to connect to the inner plate of the fairing.

2. The propeller fairing acceleration test device according to claim 1, characterized in that, The base plate is circular, and its diameter is larger than the diameter of the central hole of the fairing chassis. Multiple mounting holes are evenly arranged near the edge of the base plate, and the edge of the base plate is connected to the central hole of the fairing chassis.

3. The propeller fairing acceleration test device according to claim 2, characterized in that, The top plate is in the shape of a stepped column, including an upper section with a smaller diameter and a lower section with a larger diameter. The diameter of the upper section is smaller than the diameter of the central hole of the inner disk of the fairing, and the diameter of the lower section is larger than the diameter of the central hole of the inner disk of the fairing. The upper section extends upward from the central hole of the inner disk of the fairing.

4. The propeller fairing acceleration test device according to claim 3, characterized in that, Elastic pads are provided on the outer side wall of the upper section and the upper end face of the lower section, respectively.

5. The propeller fairing acceleration test device according to claim 4, characterized in that, Multiple pressure sensors are provided circumferentially between the outer wall of the upper section and the elastic pad, which are used to collect pressure values ​​at different locations on the outer wall of the upper section.

6. The propeller fairing acceleration test device according to claim 5, characterized in that, The sidewall of the support column is provided with side ribs along its radial direction.

7. The propeller fairing acceleration test apparatus according to any one of claims 1-6, characterized in that, The mounting base includes a fixed plate and a vertical plate. The fixed plate is used to connect to the acceleration test bench. The lower end of the vertical plate is connected to the fixed plate, and the upper end of the vertical plate is connected to the base plate.

8. The propeller fairing acceleration test device according to claim 7, characterized in that, The fixing base also includes reinforcing ribs, which are disposed on the outer side of the upright plate and perpendicular to both the upright plate and the fixing plate.

9. The propeller fairing acceleration test device according to claim 8, characterized in that, The fixing plate has multiple fixing holes.

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