Fatigue vibration test device for aviation hydraulic pipeline

Abstract

The invention discloses a fatigue vibration test device for an aviation hydraulic pipeline, and the device comprises a vibration workbench, the vibration workbench is provided with a first displacement adjustment module and a second displacement adjustment module, and the displacement adjustment direction of the first displacement adjustment module is orthogonal to the displacement adjustment direction of the second displacement adjustment module; the first displacement adjusting module and the second displacement adjusting module are each provided with a clamp. The vibration test device further comprises a hydraulic detection module and a stress-strain detection module. The hydraulic detection module is used for simulating the medium working condition state of the to-be-detected hydraulic pipe in actual service. The stress-strain detection module is used for measuring stress-strain parameters of the hydraulic pipe to be detected; compared with the prior art, the test simulation of the actual service and working condition state of the hydraulic pipe can be realized, so that researchers are assisted in researching the fretting damage mechanism and failure behavior of the aviation hydraulic pipe.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydraulic pipe test equipment, in particular to a fatigue vibration test device for an aviation hydraulic pipe. BACKGROUND

[0002] The aviation hydraulic pipe, as the most basic part of the aircraft hydraulic system, determines the reliability of the hydraulic system through the quality of the connection. The pipe joint is mainly composed of a guide pipe, a pipe sleeve and a nut, and the like, and is assembled into a static sealing structure. In the actual service process, due to the coupling effect of the fixed frequency excitation of the aircraft engine, the wideband random excitation of the aircraft body and the high pressure pulsating fluid excitation, the vibration excitation load causes the pipe and the joint system to resonate, thereby causing fatigue or wear failure of the pipe system.

[0003] Especially, the gap or tight fitting interface between the guide pipe, the pipe sleeve and the nut of the pipe joint will inevitably cause fretting wear or fretting fatigue under vibration conditions, and further cause a series of fretting damage problems such as thread loosening, material wear and leakage, and even fatigue fracture of the pipe joint; fretting damage has become one of the key common problems restricting the service safety of the current aviation pipe, but the existing technology lacks a simulation device for fretting damage, and the mechanism of fretting damage cannot be effectively researched. SUMMARY

[0004] The main purpose of the application is to provide a fatigue vibration test device for an aviation hydraulic pipe, which aims to solve the defect that the existing aviation hydraulic pipe fretting damage test device is lacking.

[0005] The application achieves the above-mentioned purpose through the following technical solutions: A fatigue vibration test device for an aviation hydraulic pipe, comprising a vibration workbench; A first displacement adjusting module is arranged on the vibration workbench; A second displacement adjusting module is arranged on the vibration workbench; the displacement adjustment direction of the first displacement adjusting module is orthogonal to the displacement adjustment direction of the second displacement adjusting module; a clamp is arranged on the first displacement adjusting module and the second displacement adjusting module; A hydraulic detection module is used to simulate the medium working condition state of the hydraulic pipe to be detected during actual service; A stress and strain detection module is used to measure the stress and strain parameters of the hydraulic pipe to be detected.

[0006] Optionally, the vibration workbench comprises a vibration table and a workbench, and the vibration table is fixedly connected with the workbench.

[0007] Optionally, the first displacement adjusting module and the second displacement adjusting module each comprise a lower sliding table, and an upper sliding table is arranged to slide on the lower sliding table; the sliding directions of the two upper sliding tables are arranged orthogonally; and a adjusting screw for driving the upper sliding table is arranged to rotate on the two lower sliding tables.

[0008] Optionally, the lower sliding table is provided with a limiting slide bar, the upper sliding table is provided with a sliding groove, and the limiting slide bar is arranged to slide into the sliding groove; and the limiting slide bar is arranged in a dovetail type or a T-shaped structure.

[0009] Optionally, the limiting slide bar is further provided with an adjusting groove, the sliding groove is provided with an adjusting block, and the adjusting screw is arranged to rotate in the adjusting groove; and the adjusting block is arranged to insert into the adjusting groove and connected with the screw thread of the adjusting screw.

[0010] Optionally, the two lower sliding tables are each provided with a displacement sensor for detecting the position of the upper sliding table.

[0011] Optionally, the hydraulic detection module comprises a hydraulic pump and a conduit adapter, and an adjusting valve, a hydraulic gauge and a quick connector are sequentially arranged between the hydraulic pump and the conduit adapter along the flow direction of the hydraulic oil.

[0012] Optionally, the hydraulic detection module further comprises a plug, and conduit adapters are arranged at both ends of the plug along the axial direction of the hydraulic pipe to be detected; the plug is connected with one of the conduit adapters, and the other conduit adapter is connected with the quick connector.

[0013] Optionally, the stress and strain detection module comprises a strain module, a signal conditioner, a signal acquisition module and an industrial computer, and the strain module, the signal conditioner, the signal acquisition module and the industrial computer are sequentially electrically connected along the signal transmission direction.

[0014] Optionally, the strain module further comprises a plurality of strain gauges, and the strain gauges are sequentially and uniformly adhered to the outer circumferential surface of the hydraulic pipe to be detected around the axial direction of the hydraulic pipe to be detected; and each strain gauge is electrically connected with the signal conditioner.

[0015] Compared with the prior art, the present application has the following beneficial effects: The present application comprises a vibration workbench, the vibration workbench is provided with a first displacement adjusting module and a second displacement adjusting module, the displacement adjustment direction of the first displacement adjusting module is orthogonal to the displacement adjustment direction of the second displacement adjusting module; the first displacement adjusting module and the second displacement adjusting module are each provided with a clamp; the vibration test device further comprises a hydraulic detection module and a stress and strain detection module, the hydraulic detection module is used for simulating the medium working condition state of the hydraulic pipe to be detected during actual service; and the stress and strain detection module is used for measuring the stress and strain parameters of the hydraulic pipe to be detected. In use, first, hydraulic oil is injected into the hydraulic pipe to be detected by the hydraulic detection module to simulate the medium working condition state of the hydraulic pipe in actual service; then the position of the two ends of the hydraulic pipe to be detected is adjusted by the first displacement adjustment module and the second displacement adjustment module, so as to comprehensively adjust the position state of the simulated hydraulic pipe to be detected and the connection state with the external device, which together with the hydraulic oil used to simulate the medium working condition realizes the simulation of the hydraulic pipe; then the actual vibration state of the hydraulic pipe is simulated by the vibration workbench. Compared with the prior art, the application can realize the test simulation of the actual service and working condition state of the hydraulic pipe, thereby assisting researchers in studying the fretting damage mechanism and failure behavior of the aviation hydraulic pipe. Secondly, during the vibration test, the application can also observe the changes of the internal medium pressure and the surface stress and strain state of the aviation hydraulic pipe during the test, wherein the change of the internal medium pressure can help researchers accurately determine the critical point of pipe failure leakage, thereby providing data support for the subsequent research on the fretting fatigue source and the fretting fatigue failure mechanism of the pipe; and the change of the surface stress and strain state can accurately obtain the stress and strain evolution law in the failure process of the hydraulic pipe under different working conditions, thereby determining the expansion mode and development path of the damage area of the hydraulic pipe, which is beneficial to reveal the damage evolution law and characteristic signals. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 A structural schematic view of a fatigue vibration test device for an aviation hydraulic pipe is provided for the embodiments of the application; Fig. 2 An exploded view of the first displacement adjustment module or the second displacement adjustment module; Fig. 3 A sectional view of the first displacement adjustment module or the second displacement adjustment module; Fig. 1 is a vibration workbench, Fig. 2 is a first displacement adjustment module, Fig. 3 is a second displacement adjustment module, Fig. 4 is a clamp, Fig. 5 is a hydraulic detection module, Fig. 6 is a stress and strain detection module, Fig. 7 is a lower sliding table, Fig. 8 is an upper sliding table, Fig. 9 is an adjusting screw, Fig. 10 is a limit sliding bar, Fig. 11 is a sliding groove, Fig. 12 is an adjusting groove, Fig. 13 is an adjusting block, Fig. 14 is a displacement sensor, Fig. 101 is a vibration table, Fig. 102 is a workbench, Fig. 501 is a hydraulic pump, Fig. 502 is a guide pipe adapter, Fig. 503 is an adjusting valve, Fig. 504 is a hydraulic gauge, Fig. 505 is a quick connector, Fig. 506 is a plug, Fig. 601 is a strain module, Fig. 602 is a signal conditioner, Fig. 603 is a signal acquisition module, Fig. 604 is an industrial computer, and Fig. 605 is a strain gauge.

[0017] The purpose implementation, functional characteristics and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0018] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications also change accordingly.

[0020] In the present application, unless otherwise explicitly specified and limited, the terms “connection”, “fixation” and the like should be understood in a broad sense, for example, “fixation” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] In addition, if the present application has a description of “first”, “second” and the like, the description of “first”, “second” and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the meaning of “and / or” appearing throughout the text includes three parallel schemes. For example, “robot coordinate system and / or m” includes robot coordinate system scheme, or m scheme, or robot coordinate system and m scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0022] Embodiment 1 With reference to Figs. 1 to 3 , the present embodiment discloses a kind of fatigue vibration test device for aviation hydraulic pipeline, including vibration workbench 1, the vibration workbench 1 includes vibration table 101 and workbench 102, the vibration table 101 is fixedly connected with the workbench 102;The workbench 102 is the base of entire test device; The vibration test device further comprises a first displacement adjusting module 2 and a second displacement adjusting module 3, the first displacement adjusting module 2 and the second displacement adjusting module 3 are completely identical in structure, and each comprises a lower sliding table 7 and an upper sliding table 8, wherein the lower sliding table 7 is fixedly arranged on the workbench 102; The lower sliding table 7 is in a long strip structure as a whole, and a limiting sliding strip 10 is integrally connected in the middle of the lower sliding table 7 along the length direction of the lower sliding table 7; each upper sliding table 8 is also in a long strip structure as a whole, and a sliding groove 11 is arranged on the upper sliding table 8 along the length direction of the upper sliding table 8, and the limiting sliding strip 10 is in a swallow-tail type or T-shaped structure; The limiting sliding strip 10 is clamped into the sliding groove 11; In use, the upper sliding table 8 is arranged on the lower sliding table 7 through the cooperation of the sliding groove 11 and the limiting sliding strip 10, which is not only simple in structure, but also ensures the stability of the connection between the upper sliding table 8 and the lower sliding table 7 due to the mutual limitation of the limiting sliding strip 10 and the sliding groove 11; Further, an adjusting screw 9 is rotatably connected to each lower sliding table 7 through a rolling bearing, and an adjusting groove 12 is arranged on the limiting sliding strip 10 along the length direction of the lower sliding table 7, and an adjusting block 13 is arranged in the sliding groove 11, when the upper sliding table 8 is assembled with the lower sliding table 7, each adjusting block 13 is inserted into the adjusting groove 12, and the adjusting screw 9 is also arranged in the adjusting groove 12, and each adjusting block 13 is connected with the adjusting screw 9 through a screw thread; The rotation of the upper sliding table 8 can be limited through the cooperation of the adjusting groove 12 and the adjusting block 13, and the sliding of the upper sliding table 8 on the lower sliding table 7 is controlled through the adjusting screw 9; The axes of the adjusting screws 9 in the first displacement adjusting module 2 and the second displacement adjusting module 3 are arranged orthogonally; Specifically, the length direction of the workbench 102 is the X-axis direction, and the width direction thereof is the Y-axis direction, the adjusting screw 9 in the first displacement adjusting module 2 is arranged along the X direction, and the adjusting screw 9 in the second displacement adjusting module 3 is arranged along the Y direction; Further, a clamp 4 is arranged on the top surface of the upper sliding table 8 of the first displacement adjusting module 2 and the top surface of the upper sliding table 8 of the second displacement adjusting module 3, the clamp 4 is adapted to the outer shape of the hydraulic pipe to be detected, so as to clamp and fix the hydraulic pipe to be detected; Further, a displacement sensor 14 is arranged on each lower sliding table 7, and the detection head of the displacement sensor 14 faces the upper sliding table 8 on the same lower sliding table 7, so as to detect whether the position of the upper sliding table 8 meets the requirements, and improve the control accuracy of the equipment; Further, the vibration test device further comprises a hydraulic pressure detection module 5 and a stress and strain detection module 6, wherein the hydraulic pressure detection module 5 comprises a hydraulic pump 501, a conduit adapter 502 and a plug 506, along the axial direction of the hydraulic pipe to be detected, both ends of the hydraulic pipe to be detected are provided with the conduit adapter 502, one of the conduit adapters 502 is connected with the plug 506, so as to seal the end of the hydraulic pipe to be detected, and the other conduit adapter 502 is connected with a hydraulic pipe, the hydraulic pipe is provided with an adjusting valve 503, a hydraulic pressure gauge 504, a quick connector and the hydraulic pump 501; Along the direction of hydraulic oil flow, the adjusting valve 503, the hydraulic pressure gauge 504, the quick connector and the hydraulic pump 501 are arranged in sequence; The hydraulic pump 501 pumps the hydraulic oil into the hydraulic pipe, at the same time, the hydraulic pressure gauge 504 observes the pressure in the hydraulic pipe, when the specified pressure is reached, the hydraulic pipeline is adjusted by the adjusting valve 503, so as to realize the pressure maintaining of the hydraulic pipe to be detected; The quick connector is conducive to improving the disassembly and assembly efficiency of various components, and is conducive to replacing different equipment.

[0023] Further, the stress and strain detection module 6 comprises a strain module 601, a signal conditioner 602, a signal acquisition module 603 and an industrial computer 604, along the signal transmission direction, the strain module 601, the signal conditioner 602, the signal acquisition module 603 and the industrial computer 604 are electrically connected in sequence; The strain module 601 further comprises a plurality of strain gauges 605, the strain module 601 is determined according to the detection accuracy and the outer diameter of the hydraulic pipe, preferably, the number of the strain gauges 605 is not less than 5; Around the axial direction of the hydraulic pipe to be detected, each strain gauge 605 is uniformly bonded to the outer circumferential surface of the hydraulic pipe to be detected in sequence; each strain gauge 605 is electrically connected with the signal conditioner 602; Correspondingly, the application also discloses a test method based on the above vibration test device, comprising the following steps: S1, adjusting the adjusting screw (i.e. the first displacement adjusting module) in the X-axis direction according to the length of the hydraulic pipe to be detected, so as to control the distance between the two clamps and ensure that the two clamps can fix the pipe to be detected; S2, installing the hydraulic pipe to be detected, and completing the installation of the hydraulic pressure detection module and the stress and strain detection module; S3, formulating a loading scheme and a target offset corresponding to the loading scheme according to the actual working condition of the hydraulic pipe to be detected; The loading scheme includes X-direction loading, Y-direction loading and XY-direction loading, the X-direction loading refers to loading a target offset amount in the X-direction only, the Y-direction loading refers to loading a target offset amount in the Y-direction only, the XY-direction loading refers to loading a target offset amount in both the X-direction and the Y-direction, and the target offset amount is determined according to the actual working condition of the hydraulic pipe to be detected; S4, introducing hydraulic oil into the inside of the measured hydraulic pipe through the pressure pump, and the pressure of the hydraulic oil is determined according to the actual working condition of the hydraulic pipe to be detected; S5, the computer inputs random spectrum for random vibration, and the signal acquisition module continuously monitors stress and strain in the process, and the pressure indicator number monitors the test progress state; when the oil pressure value in the measured pipeline rapidly decreases, it indicates that the measured pipe sample has crack defects and pressure medium leakage occurs, and the test can be stopped; Compared with the prior art, the application can realize the test simulation of the actual service and working condition of the hydraulic pipe, and then assist researchers in studying the fretting damage mechanism and failure behavior of the aviation hydraulic pipe; Secondly, during the vibration test, the application can also observe the change of the internal medium pressure of the aviation hydraulic pipe and the change of the surface stress and strain state during the test, wherein the change of the internal medium pressure can help researchers accurately determine the critical point of pipeline failure leakage, and provide data support for the subsequent research of pipeline fretting fatigue source and fretting fatigue failure mechanism; and through the change of the surface stress and strain state, the stress and strain evolution law in the failure process of the hydraulic pipe under different working conditions can be accurately obtained, and then the expansion mode and development path of the hydraulic pipe damage area can be determined, which is helpful to reveal the damage evolution law and characteristic signal.

[0024] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A fatigue vibration testing device for aviation hydraulic pipelines, characterized in that, Including a vibrating worktable (1); The first displacement adjustment module (2) is disposed on the vibration worktable (1); The second displacement adjustment module (3) is disposed on the vibration worktable (1); the displacement adjustment direction of the first displacement adjustment module (2) is orthogonal to the displacement adjustment direction of the second displacement adjustment module (3); both the first displacement adjustment module (2) and the second displacement adjustment module (3) are provided with clamps (4); Hydraulic testing module (5), the hydraulic testing module (5) is used to simulate the working conditions of the medium when the hydraulic pipe under test is actually in service; The stress-strain detection module (6) is used to measure the stress-strain parameters of the hydraulic pipe to be tested.

2. The fatigue vibration testing device for aviation hydraulic pipelines according to claim 1, characterized in that, The vibration worktable (1) includes a vibration table (101) and a worktable (102), wherein the vibration table (101) and the worktable (102) are fixedly connected.

3. The fatigue vibration testing device for aviation hydraulic pipelines according to claim 1, characterized in that, Both the first displacement adjustment module (2) and the second displacement adjustment module (3) include a lower slide (7), and an upper slide (8) is slidably arranged on the lower slide (7); the sliding directions of the two upper slides (8) are orthogonal; and an adjustment screw (9) for driving the upper slide (8) is rotatably arranged on both lower slides (7).

4. The fatigue vibration testing device for aviation hydraulic pipelines according to claim 3, characterized in that, The lower slide (7) has a limiting slide bar (10), and the upper slide (8) is provided with a slide groove (11). The limiting slide bar (10) slides into the slide groove (11). The cross-section of the limiting slide bar (10) is set in a dovetail or T-shaped structure.

5. A fatigue vibration testing device for aviation hydraulic pipelines according to claim 4, characterized in that, The limiting slide bar (10) is also provided with an adjustment groove (12), and an adjustment block (13) is provided in the groove (11). The adjustment screw (9) is rotatably disposed in the adjustment groove (12), and the adjustment block (13) is inserted into the adjustment groove (12) and threadedly connected to the adjustment screw (9).

6. A fatigue vibration testing device for aviation hydraulic pipelines according to claim 3, characterized in that, Both of the sliding stages (7) are equipped with displacement sensors (14) for detecting the position of the upper sliding stage (8).

7. The fatigue vibration testing device for aviation hydraulic pipelines according to claim 1, characterized in that, The hydraulic detection module (5) includes a hydraulic pump (501) and a conduit adapter (502). Along the hydraulic oil flow direction, a regulating valve (503), a hydraulic gauge (504), and a quick-connect connector (505) are sequentially arranged between the hydraulic pump (501) and the conduit adapter (502).

8. A fatigue vibration testing device for aviation hydraulic pipelines according to claim 7, characterized in that, The hydraulic testing module (5) also includes a plug (506), with a conduit adapter (502) at both ends along the axial direction of the hydraulic pipe to be tested. The plug (506) is connected to one of the conduit adapters (502), and the other conduit adapter is connected to the quick-connect connector (505).

9. A fatigue vibration testing device for aviation hydraulic pipelines according to claim 1, characterized in that, The stress and strain detection module (6) includes a strain module (601), a signal conditioner (602), a signal acquisition module (603), and an industrial control computer (604). Along the signal transmission direction, the strain module (601), the signal conditioner (602), the signal acquisition module (603), and the industrial control computer (604) are electrically connected in sequence.

10. A fatigue vibration testing device for aviation hydraulic pipelines according to claim 9, characterized in that, The strain module (601) includes a plurality of strain gauges (605), which are uniformly bonded to the outer circumferential surface of the hydraulic pipe to be tested in sequence around the axial direction of the hydraulic pipe to be tested; each strain gauge (605) is electrically connected to the signal conditioner (602).

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