A ground simulation test device for hydraulic excitation of an aero-engine hydraulic pipeline system

Abstract

The application relates to an aero-engine hydraulic pipeline system hydraulic excitation ground simulation test device, which comprises a base for simulating basic excitation generated by an aero-engine; a pipeline fixing and detecting module fixedly installed on a simulation case installed on the base; an excitation loop module through which a measured pipeline is communicated with the excitation loop module; an excitation pump source module connected with the excitation loop module and used for applying fluid dynamic load to the measured pipeline connected with the excitation loop module; an oil liquid state pipeline module communicated with the excitation loop module and used for real-time monitoring; and an electric control system module used for realizing real-time monitoring, control and display of four types of key indexes of oil liquid, i.e. pressure, flow, oil temperature and cleanliness. The application can more truly reflect internal fluid pressure pulsation working conditions of the aero-engine hydraulic pipeline system and realize hydraulic excitation simulation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vibration test of aviation hydraulic pipeline system, and particularly relates to a ground simulation test device for hydraulic excitation of an aviation engine hydraulic pipeline system. BACKGROUND

[0002] The aviation engine hydraulic pipeline system connects various components, accessories, components and accessories, and the engine and the aircraft, and is mainly responsible for conveying fuel, hydraulic oil and lubricating oil, and accomplishing functions such as engine operation, control and operation, and is an important component of the aviation engine. Any fault of any pipeline may cause serious accidents. Therefore, the reliability of the aviation engine hydraulic pipeline system is crucial to the performance and service life of the engine.

[0003] Due to the particularity of the service environment, the aviation engine hydraulic pipeline system inevitably deforms in the service process. Once the vibration exceeds the limit, irreversible damage will be caused to the pipeline, and finally the pipeline will fail. In recent years, with the rapid development of the modernization of aerospace and related industries, the working environment of the aviation engine pipeline system is gradually developing towards high pressure, high speed, high load and high reliability, resulting in more serious failure of the aviation engine hydraulic pipeline. The failure rate of the pipeline of the active aircraft (including the engine) in China accounts for 52% of the element failure. Therefore, the design, performance optimization and test evaluation of the pipeline system constitute an important link in the design of the aviation engine, and reducing the vibration of the pipeline and improving the service reliability of the pipeline have important practical significance for the operation and maintenance of the entire aviation engine.

[0004] The hydraulic piping system of an aircraft engine has the characteristics of "limited installation space", "weak support", "large number of pipelines and complex spatial configuration", and "complex loads". The vibration characteristics of the pipelines are complex, and it is difficult to obtain accurate and reliable results through theoretical and simulation analysis. Complete tests can more directly reveal the vibration characteristics of the hydraulic piping system of an aircraft engine under complex load conditions, and thus become the main means to guide the design and performance optimization of the piping system. Due to the particularity of the working environment, achieving complete test conditions to fully reproduce the actual working conditions of the aircraft hydraulic piping system places stringent requirements on the test equipment, which mainly has the following characteristics: high pressure and high speed of the fluid in the pipe, complex spatial layout of the pipe, multiple pipes in series and parallel with a large number of structural couplings, complex vibration transmission, and difficulty in load reproduction. Currently, a number of vibration test benches for aircraft engine hydraulic pipeline systems have been designed. Most of these test benches have simplified key vibration influencing factors such as the structure and operating conditions of the pipeline system based on the research focus. Although they can achieve certain load simulation and data acquisition capabilities under certain conditions, they still cannot fully reproduce the load conditions of the aircraft engine hydraulic pipeline system during actual service, making it difficult to ensure the reliability of the experimental results.

[0005] For example, a Chinese patent (publication number: CN103742483A, publication date: April 23, 2014) discloses a coupled vibration simulation test bench for an aircraft engine hydraulic pipeline system. This test bench installs the hydraulic pipelines used in the hydraulic pipeline oil supply system unit on the casing of the pipeline carrier excitation unit. The casing simulates the actual vibration effects of the aircraft engine casing on the hydraulic pipeline. While this test bench considers the coupling effects of multiple pipe connections, it only simulates the excitation generated by the casing. It does not consider the different flow-induced vibration effects caused by the different fluid motions within different pipes, and does not address the conditions such as the presence of high-speed, high-pressure fluids within the pipes in real operating conditions.

[0006] A Chinese patent application (publication number: CN114909362A, publication date: August 16, 2022) discloses a multi-parameter measurement test device and method for aircraft engine hydraulic piping. This device uses a vibrator to simulate the vibration excitation transmitted by the engine body to the piping, and a hydraulic pumping unit to simulate the hydraulic pulses in the aircraft engine hydraulic piping, thereby achieving a simple simulation of the actual vibration excitation of the aircraft engine hydraulic piping system during service. While this test device takes into account the vibration transmission from the engine body to the piping, the fluid pressure pulsation generated by the high-pressure, high-speed fluid inside the piping, and the influence of hydraulic shock on the piping vibration, the vibration excitation force simulated by the vibrator is relatively small and only applies to a single pipeline, and cannot simulate the vibration excitation of multiple pipelines connected to the engine body. In addition, the pumping unit structure of the device is relatively simple, which cannot effectively simulate the fluid pressure pulsation excitation of multiple test pipelines simultaneously under different parameter conditions and different component configurations. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention provides a hydraulic excitation ground simulation test device for aircraft engine hydraulic piping systems, taking into account the impact of multiple series or parallel pipelines based on the actual operating environment of aircraft engine hydraulic piping systems. This device more realistically reflects the internal fluid pressure pulsation conditions of aircraft engine hydraulic piping systems and implements hydraulic excitation simulation. Combined with existing electromagnetic vibration tables that simulate the vibration of the piping system, this device ultimately provides an effective ground simulation test device for conducting dynamic modeling, vibration transmission, and vibration suppression research on complex spatial piping under multi-source excitation. This device provides reliable experimental support for the verification of models and related analysis methods, and for accurate experimental analysis of the vibration and stress characteristics of the piping.

[0008] A hydraulic excitation ground simulation test device for an aircraft engine hydraulic piping system, comprising:

[0009] a base (6) for simulating the base excitation generated by the aircraft engine;

[0010] A pipeline fixing and detection module (4) is fixedly mounted on a simulated casing mounted on a base (6);

[0011] The excitation circuit module (2) is connected to the excitation circuit module (2) through the pipeline fixing and detection module (4);

[0012] An excitation pump source module (1) is connected to an excitation circuit module (2) and is used to apply a fluid dynamic load to a measured pipeline connected to the excitation circuit module (2);

[0013] The oil state pipeline module (3) is connected to the excitation circuit module (2) and is used to monitor the oil state in real time to ensure the reliable operation of the hydraulic excitation simulation test device;

[0014] The electric control system module (5) is connected to the excitation pump source module (1), the excitation circuit module (2) and the oil state management module (3) respectively, and is used to realize real-time monitoring, control and display of four key indicators of oil pressure, flow, oil temperature and cleanliness.

[0015] The base (6) is a common rigid support or a vibration table, fixedly connected to the ground.

[0016] The excitation pump source module (1) comprises a hydraulic oil tank (1.4), and a manual high-pressure ball valve (1.1), a pressure relay (1.2), and a liquid level gauge (1.3) are installed at the bottom of one side of the hydraulic oil tank (1.4); the oil inlet of the constant-pressure variable plunger pump (1.7) is connected to the hydraulic oil tank (1.4) through an oil suction filter (1.5); a check valve (1.8) is installed on the main oil line of the oil outlet of the constant-pressure variable plunger pump (1.7); a normally open electromagnetic overflow valve (1.9), a first pressure gauge (1.11), and a first pressure sensor (1.10) are installed on the bypass line; and the normally open electromagnetic overflow valve (1.9) is connected to the hydraulic oil tank (1.4);

[0017] The first pressure sensor (1.10) is a high-precision, high-sensitivity pressure sensor;

[0018] The constant pressure variable displacement plunger pump (1.7) is connected to the variable frequency motor (1.6) and fixedly installed together on the hydraulic pump station (1.12), and the constant pressure variable displacement plunger pump (1.7) is driven by the variable frequency motor (1.6);

[0019] The constant pressure variable displacement plunger pump (1.7) is a 9-plunger high-pressure plunger pump commonly used in aircraft engines, with a rated pressure of 315 Bar, a maximum displacement of 28 cc, a speed range of 600 to 3200 rpm, a maximum pressure of up to 350 Bar, a cut-off pressure that can be manually adjusted, and a geometric displacement that can be manually adjusted between 17.8 and 28.7 cc. It can simulate pressure pulsations within a high-frequency bandwidth range of 90 to 480 Hz.

[0020] The excitation circuit module (2) comprises an outlet oil separator block and a return oil separator block, the outlet oil separator block and the return oil separator block being fixedly mounted on the hydraulic oil tank (1.4) of the excitation pump source module (1), the oil inlet of the outlet oil separator block being connected to the main oil circuit of the oil outlet of the constant pressure variable plunger pump in the excitation pump source module (1), and the oil outlet of the return oil separator block being connected to the hydraulic oil tank (1.4) of the excitation pump source module (1), forming the main oil circuit;

[0021] The pipeline fixing and detection module (4) is arranged between the outlet oil separation block and the return oil separation block of the excitation circuit module (2), and comprises an inlet detection block (4.2), an outlet detection block, a pressure sensor, and a data acquisition device (4.1) electrically connected thereto; the inlet detection block (4.2) and the outlet detection block (4.3) are fixed to the simulated casing of the base (6) by bolt connection.

[0022] The outlet oil distributor block includes six circuit oil outlets, each of which is connected to the oil inlet of the inlet detection block (4.2) via a high-pressure hose (2.14); the tested pipeline is connected between the oil outlet of the inlet detection block (4.2) and the oil inlet of the outlet detection block (4.3); the return oil distributor block includes six branch oil inlets, each of which is connected to the oil outlet of the outlet detection block (4.3) via a high-pressure hose (2.14); the six branch oil outlets of the return oil distributor block are connected to the hydraulic oil tank (1.4);

[0023] Each branch between the inlet detection block (4.2) and the outlet detection block (4.3) can be directly connected to a single pipeline to be tested, or can be connected in series or in parallel to multiple pipelines to be tested as needed.

[0024] The oil inlet of the outlet oil distributor block is divided into six, forming six relatively independent circuit oil outlets, namely A1, A2, A3, A4, A5, and A6. The six circuit oil outlets are all equipped with a second pressure gauge (2.2) and a manual high-pressure ball valve (2.3) for the outlet oil distributor block branch. The A4 circuit is also equipped with a pressure reducing valve (2.1), and the A5 circuit is also equipped with a diaphragm accumulator (2.4) and a high-pressure ball valve (2.5). The oil outlets of the six circuit oil outlets of the outlet oil distributor block are connected to the inlet detection block of the three circuits through high-pressure hoses. (4.2), A1, A2, and A3 are connected to the inlet detection block a, and A4, A5, and A6 are connected to the inlet detection block b; the circuit of the inlet detection block (4.2) corresponds to the six circuit oil outlets of the outlet oil distribution block connected thereto, and the five circuits of the inlet detection block (4.2) corresponding to A1, A2, A4, A5, and A6 are all installed with a high-precision, high-sensitivity second pressure sensor (2.6), and the circuit corresponding to A3 is installed with two low-pressure, high-precision pressure sensors (2.7) with shut-off valves;

[0025] The six loops of the entrance detection block a and the entrance detection block b are respectively connected to the six branch inlets of the outlet detection block (4.3) through the pipeline to be tested, the six loops of the outlet detection block (4.3) are connected to the six branch inlets B1, B2, B3, B4, B5 and B6 of the back inlet oil distribution block, B1, B2, B3, B4, B5 and B6 are respectively corresponding to A1, A2, A3, A4, A5 and A6; the second pressure sensor (2.6) with high precision and high sensitivity is installed on the six loops of the outlet detection block (4.3) corresponding to B1, B2, B4, B5 and B6, and two low pressure and high precision pressure sensors (2.7) with stop valves are installed on the loop corresponding to B3; the back inlet oil distribution block branch manual high pressure ball valve (2.8) is installed on the six branch outlets of the back inlet oil distribution block, the proportional flow valve (2.9) and the flow sensor (2.10) are further installed on B1 and B2, the overflow valve (2.11) is further installed on B3 and B4, the manual throttle valve (2.12) is installed on B5, and the quick cut-off electromagnetic valve (2.13) is installed on B6.

[0026] The pressure reducing valve (2.1) is installed on A3 of the outlet oil distribution block of the excitation loop module (2), and the overflow valve (2.11) is installed in B3 and B4 of the back inlet oil distribution block; the diaphragm accumulator (2.4) is arranged in A5 of the outlet oil distribution block of the excitation loop module (2), the high pressure ball valve (2.5) for opening the diaphragm accumulator (2.4) can connect the diaphragm accumulator (2.4) to the loop, and in the normal pipeline test state, the accumulator (2.4) can be isolated from the test loop by closing the high pressure ball valve (2.5).

[0027] The quick cut-off electromagnetic valve (2.13) is arranged on the B6 loop of the back inlet oil distribution block of the excitation loop module (2), and the flow of the branch can be cut off by quickly closing the quick cut-off electromagnetic valve (2.13).

[0028] The oil state management module (3) comprises a filling cover (3.1), a water cooling pump (3.2), a plate heat exchanger (3.3), a precision filter (3.4), a water cooling machine (3.5) and a detection element, the filling cover (3.1) is provided with a filter and is installed on the hydraulic oil tank (1.4) of the excitation pump source module (1); the oil inlet of the water cooling pump (3.2) is connected to the hydraulic oil tank (1.4), and the oil outlet of the water cooling pump (3.2) is connected to the oil inlet of the plate heat exchanger (3.3); the plate heat exchanger (3.3) is installed on the top of the hydraulic pump station (1.12), and the oil outlet of the plate heat exchanger (3.3) is connected to the hydraulic oil tank (1.4); the precision filter (3.4) is installed between the plate heat exchanger (3.3) and the hydraulic oil tank (1.4); the water cooling circuit of the plate heat exchanger (3.3) is connected to the water cooling machine (3.5) through a water pipe;

[0029] The detection elements include a first pressure sensor (1.10) of the excitation pump source module (1), a second pressure sensor (2.6) of the excitation loop module (2), a low-pressure high-precision pressure sensor (2.7), and a flow sensor (2.10).

[0030] The electric control system module (5) comprises an electric control box (5.1), a PLC module, a frequency converter, a visual operating console (5.2), a host computer (5.3), a shielded cable, and a sheath, wherein the PLC module and the frequency converter, as well as the cables connected thereto, are fixedly installed in the electric control box (5.1); the electric control box (5.1) is fixedly installed on the ground and arranged on one side of the hydraulic pump station (1.12); the visual operating console (5.2) is connected to the PLC module via a shielded cable; and the host computer (5.3) is connected to the PLC module and the detection element via a shielded cable.

[0031] The beneficial effects of the present invention are as follows: the hydraulic excitation ground simulation test device for the hydraulic pipeline system of an aviation engine of the present invention realizes flexible adjustment of the pump source flow rate and pressure pulsation frequency and amplitude by adjusting the constant pressure variable plunger pump of the excitation pump source module and the throttle valves on each branch; the test device also sets 6 branches equipped with different hydraulic components and connected to the tested pipeline so that each branch has different functional properties such as pressure and flow, thereby more flexibly simulating the complex and changeable hydraulic load states of multiple pipelines under test of the engine, and realizing the flow of multiple series or parallel pipelines under different parameter conditions and different component configurations at the same time. The real simulation of the body pressure pulsation excitation working condition includes load conditions such as fluid pulsation excitation under high pressure and large flow, hydraulic shock, offline pressurized state of pipeline, and internal fluid excitation of pipeline including passive vibration absorption effect; at the same time, the tested pipeline successfully simulates the tapered thread, pipe thread, flange and other connection forms commonly used on aircraft engines through the connection method consistent with the pipeline on the aircraft engine, realizing effective simulation of the boundary connection state of the tested pipeline; combined with the existing electromagnetic vibration table to simulate the body vibration of the pipeline system, it can ultimately provide complete and effective ground simulation test conditions for the realization of the vibration characteristics research of complex space pipelines under multi-source excitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a connection diagram of the hydraulic excitation ground simulation test device for the hydraulic piping system of an aircraft engine according to the present invention;

[0033] Figure 2 Schematic diagram of the connection and control relationship between the modules in the present invention;

[0034] Figure 3 It is the hydraulic general principle diagram of the present invention;

[0035] Figure 4This is a hydraulic principle diagram of the excitation pump source module of the present invention when it is working;

[0036] Figure 5 is the hydraulic characteristic curve of the constant pressure variable displacement plunger pump in the excitation pump source module of the present invention;

[0037] Figure 6 This is a diagram showing the hydraulic working principle of the six-channel test circuit of the excitation circuit module of the present invention;

[0038] Figure 7 This is a schematic diagram of the bypass filtration and cooling system in the oil state management module of the present invention;

[0039] in,

[0040] 1-excitation pump source module, 2-excitation circuit module, 3-oil status management module, 4-pipeline fixing and detection module, 5-electronic control system module, 6-base, 7-tested pipeline;

[0041] 1.1 - Manual high-pressure ball valve for the oil tank, 1.2 - Pressure relay, 1.3 - Liquid level gauge, 1.4 - Hydraulic oil tank, 1.5 - Suction filter, 1.6 - Frequency conversion motor, 1.7 - Constant pressure variable piston pump, 1.8 - Check valve, 1.9 - Normally open electromagnetic relief valve, 1.10 - First pressure sensor, 1.11 - First pressure gauge, 1.12 - Hydraulic pump station;

[0042] 2.1- Pressure reducing valve, 2.2- Second pressure gauge, 2.3- Manual high-pressure ball valve for outlet oil distributor branch, 2.4- Accumulator, 2.5- High-pressure ball valve, 2.6- Second pressure sensor, 2.7- Low-pressure high-precision pressure sensor, 2.8- Manual high-pressure ball valve for return oil distributor branch, 2.9- Proportional flow valve, 2.10- Flow sensor, 2.11- Relief valve, 2.12- Manual throttle valve, 2.13- Quick-cut solenoid valve, 2.14- High-pressure hose;

[0043] 3.1-Filling cap, 3.2-Water cooling pump, 3.3-Plate heat exchanger, 3.4-Precision filter, 3.5-Water chiller, 3.6-Laboratory wall;

[0044] 4.1-Data collector, 4.2-Entry detection block, 4.3-Exit detection block;

[0045] 5.1-Electric control box, 5.2-Visual operation console, 5.3-Upper computer. DETAILED DESCRIPTION

[0046] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below with reference to the accompanying drawings through specific implementation methods.

[0047] like Figure 1-7 As shown, a hydraulic excitation ground simulation test device for an aircraft engine hydraulic pipeline system includes a base 6, a pipeline fixing and detection module 4 fixedly mounted on a simulated casing mounted on the base 6. The base 6 can be a conventional rigid support or a vibration table, fixedly connected to the ground, and is used to simulate the foundation excitation generated by the aircraft engine. The pipeline under test 7 is connected to the excitation circuit module 2 via the pipeline fixing and detection module 4. The excitation pump source module 1 is connected to the excitation circuit module 2 to apply a fluid dynamic load to the pipeline under test 7 connected to the excitation circuit module 2. The oil state pipeline module 3 is connected to the excitation circuit module 2 to monitor the oil state in real time to ensure the reliable operation of the hydraulic excitation simulation test device. The electronic control system module 5 is connected to the excitation pump source module 1, the excitation circuit module 2, and the oil state management module 3, respectively, to enable real-time monitoring, control, and display of four key indicators of the hydraulic excitation simulation test device: pressure, flow, oil temperature, and cleanliness.

[0048] The excitation pump source module 1 includes a manual high-pressure ball valve 1.1 for the oil tank, a pressure relay 1.2, a liquid level gauge 1.3, a hydraulic oil tank 1.4, an oil suction filter 1.5, a variable frequency motor 1.6, a constant pressure variable piston pump 1.7, a one-way valve 1.8, a normally open electromagnetic overflow valve 1.9, a first pressure sensor 1.10, a first pressure gauge 1.11 and a hydraulic pump station 1.12. The manual high-pressure ball valve 1.1, the pressure relay 1.2 and the liquid level gauge 1.3 are installed at the bottom of one side of the hydraulic oil tank 1.4. The manual high-pressure ball valve 1.1 for the oil tank is used to remove excess hydraulic oil in the oil tank or replace the hydraulic oil. The pressure relay 1.2 is used for safety protection of the hydraulic system. The liquid level gauge 1.3 is used to monitor the oil level in the oil tank to ensure sufficient oil and avoid system failure or pump idling due to insufficient oil. The oil inlet of the constant-pressure variable displacement piston pump 1.7 is connected to the hydraulic oil tank 1.4 through an oil suction filter 1.5. A one-way valve 1.8 is installed on the main oil line of the oil outlet of the constant-pressure variable displacement piston pump 1.7, and a normally open electromagnetic relief valve 1.9, a first pressure gauge 1.11, and a first pressure sensor 1.10 are installed on the bypass line. The normally open electromagnetic relief valve 1.9 is connected to the hydraulic oil tank 1.4.

[0049] The first pressure sensor 1.10 is a high-precision, high-sensitivity pressure sensor.

[0050] The normally open electromagnetic relief valve 1.9 enables no-load starting of the constant-pressure variable displacement piston pump 1.7, preventing excessive current from flowing during startup of the variable-frequency motor 1.6. Furthermore, the electromagnetic relief valve 1.9 functions as a safety valve, preventing damage to the pipeline and the measured pipeline 7 from system overpressure.

[0051] The constant pressure variable piston pump 1.7 is connected to the variable frequency motor 1.6 and fixedly installed on one side of the hydraulic pump station 1.12. The constant pressure variable piston pump 1.7 is driven by the variable frequency motor 1.6. The output state of the constant pressure variable piston pump 1.7 can be changed in real time by adjusting the control parameters of the variable frequency motor 1.6.

[0052] In this embodiment, the constant pressure variable displacement plunger pump 1.7 is a 9-plunger high-pressure plunger pump commonly used in aircraft engines, with a rated pressure of 315 Bar, a maximum displacement of 28 cc, a speed range of 600-3200 rpm, a maximum pressure of up to 350 Bar, a cut-off pressure that can be manually adjusted, and a geometric displacement that can be manually adjusted between 17.8 and 28.7 cc. It can simulate pressure pulsations within a high-frequency bandwidth range of 90-480 Hz, and can better cover the working pressure conditions of aircraft engine hydraulic lines. Figure 4 The figure shows the hydraulic characteristic curve of constant-pressure variable piston pump 1.7. When the pressure reaches the set cutoff pressure, the flow rate of constant-pressure variable piston pump 1.7 automatically decreases. At this time, constant-pressure variable piston pump 1.7 operates in a high-pressure, low-flow state, thereby saving energy and reducing temperature rise. When the pressure of the excitation pump source module 1 approaches the preset full-cutoff pressure, the flow rate of constant-pressure variable piston pump 1.7 automatically decreases. The output flow rate and full-cutoff pressure of constant-pressure variable piston pump 1.7 can also be manually adjusted as needed.

[0053] The excitation circuit module 2 includes an outlet oil separator block and a return oil separator block. The outlet oil separator block and the return oil separator block are installed and fixed on the hydraulic oil tank 1.4. The oil inlet of the outlet oil separator block is connected to the main oil circuit of the oil outlet of the constant pressure variable piston pump 1.7 in the excitation pump source module 1, and the oil outlet of the return oil separator block is connected to the hydraulic oil tank 1.4 of the excitation pump source module 1, forming the main oil circuit.

[0054] The pipeline fixing and detection module 4 is arranged between the outlet oil separation block and the return oil separation block of the excitation circuit module 2, and includes an inlet detection block 4.2, an outlet detection block 4.3, a pressure sensor and a data collector 4.1 electrically connected thereto. The inlet detection block 4.2 and the outlet detection block 4.3 are fixed to the simulated casing of the base 6 by bolts.

[0055] The outlet oil distributor block includes six circuit oil outlets, each connected to the oil inlet of the inlet detection block 4.2 via high-pressure hoses 2.14. The tested pipeline 7 is connected between the oil outlet of the inlet detection block 4.2 and the oil inlet of the outlet detection block 4.3. The return oil distributor block includes six branch oil inlets, each connected to the oil outlet of the outlet detection block 4.3 via high-pressure hoses 2.14. The six branch oil outlets of the return oil distributor block are connected to the hydraulic oil tank 1.4.

[0056] Each branch between the inlet detection block 4.2 and the outlet detection block 4.3 can directly connect to a single pipeline under test 7, or multiple pipelines 7 can be connected in series or in parallel as needed. The pipelines under test 7 are connected to pipe joints by welding. The pipe joints connect to the inlet detection block 4.2 and the outlet detection block 4.3 using various connection methods commonly used in aircraft engines, including tapered threads, pipe threads, and flange connections. The inlet detection block 4.2 and the outlet detection block 4.3 are connected to the hydraulic pump station 1.12 using a four-layer steel wire braided high-pressure hose 2.14.

[0057] The oil inlet of the outlet oil distributor block is connected to the main oil circuit of the oil outlet of the constant pressure variable piston pump 1.7. The outlet oil distributor block is then divided into six, forming six relatively independent circuit oil outlets, namely A1, A2, A3, A4, A5, and A6. A second pressure gauge 2.2 and a manual high-pressure ball valve 2.3 for the outlet oil distributor block branch are installed on each of the six circuit oil outlets. The second pressure gauge 2.2 is used to monitor the current circuit oil pressure in real time. The manual high-pressure ball valve 2.3 for the outlet oil distributor block branch can easily realize the switching in and out of each circuit. According to the test requirements, a pressure pulse excitation test of the tested pipeline 7 can be performed on one branch or multiple branches at the same time (up to six branches can be tested simultaneously). A pressure reducing valve 2.1 is additionally installed on the A4 circuit, and a diaphragm accumulator 2.4 and a high-pressure ball valve 2.5 are additionally installed on the A5 circuit. The six oil outlets of the outlet oil distribution block are connected to the three-circuit inlet detection block 4.2 via high-pressure hoses 2.14. A1, A2, and A3 are connected to inlet detection block a, while A4, A5, and A6 are connected to inlet detection block b. The circuits of inlet detection block 4.2 correspond to the six oil outlets of the outlet oil distribution block with which it is connected. High-precision, high-sensitivity second pressure sensors 2.6 are installed on the five circuits corresponding to A1, A2, A4, A5, and A6. Two low-pressure, high-precision pressure sensors 2.7 with shutoff valves are installed on the circuit corresponding to A3.

[0058] The six loops of the entrance detection block a and the entrance detection block b are respectively connected to the six branch inlets of the outlet detection block 4.3 through the pipeline 7 to be detected, the six loops of the outlet detection block 4.3 are respectively connected to the six branch inlets B1, B2, B3, B4, B5 and B6 of the return oil distribution block, and B1, B2, B3, B4, B5 and B6 are respectively one-to-one corresponding to A1, A2, A3, A4, A5 and A6. The second pressure sensor 2.6 with high precision and high sensitivity is installed on the six loops of the outlet detection block 4.3 corresponding to B1, B2, B4, B5 and B6, and two low-pressure high-precision pressure sensors 2.7 with stop valves are installed on the loop corresponding to B3. The return oil distribution block branch manual high-pressure ball valve 2.8 is installed on the six branch outlets of the return oil distribution block, the proportional flow valve 2.9 and the flow sensor 2.10 are additionally installed on the B1 and B2 loops, the overflow valve 2.11 is additionally installed on the B3 and B4 loops, the manual throttle valve 2.12 is installed on the B5 loop, and the quick cut-off electromagnetic valve 2.13 is installed on the B6 loop.

[0059] In the embodiment of the present application, the pressure reducing valve 2.1 is additionally installed in the A3 loop of the outlet oil distribution block of the excitation loop module 2, and the overflow valve 2.11 is installed in the B3 loop and the B4 loop of the return oil distribution block. The pressure reducing valve 2.1 and the overflow valve 2.11 are two typical pressure valves, and according to the working principle of the pressure valve, it will inevitably affect the pressure of the pipeline system in the state of reducing pressure and overflow. Therefore, in the hydraulic excitation simulation test device, the influence of the pressure valve on the pipeline system pressure pulsation frequency, pulsation amplitude and pulsation order can be evaluated and studied, so as to further analyze the influence of the pressure valve in the pipeline system on the pipeline vibration.

[0060] The inlet position of the entrance detection block 4.2 and the outlet position of the outlet detection block 4.3 are connected in the form of a 24° taper pipe joint (G thread) matched with the hydraulic pump station 1.12.

[0061] In an embodiment of the present invention, a diaphragm accumulator 2.4 is provided in the A5 circuit of the outlet oil separation block of the excitation circuit module 2. By opening the high-pressure ball valve 2.5 of the diaphragm accumulator 2.4, the diaphragm accumulator 2.4 can be connected to the circuit. Under normal pipeline test conditions, the accumulator 2.4 can be isolated from the test circuit by closing the high-pressure ball valve 2.5. When the high-pressure ball valve 2.5 is opened, the accumulator 2.4 can be connected to the test A5-B5 branch. Since the diaphragm of the accumulator 2.4 has a buffering and vibration absorption function, the passive vibration absorption effect of the accumulator 2.4 can be used to study its influence on the vibration response such as the pulsation amplitude of the pipeline system. In addition, under load, if the manual high-pressure ball valve 2.3 of the outlet oil separation block branch and the manual high-pressure ball valve 2.8 of the return oil separation block branch at both ends of the A5-B5 branch are quickly closed, the pressure oil can be sealed in the tested pipeline 7. Because accumulator 2.4 stores a certain amount of hydraulic oil, it can maintain a small amount of leakage from components over a long period of time, thereby ensuring that the pressure in the closed pipeline is maintained for a long time. This enables the hydraulic vibration simulation device to simulate an offline pressurized environment, allowing vibration response evaluation and research on the tested pipeline 7 in this state.

[0062] In an embodiment of the present invention, a quick-cut solenoid valve 2.13 is configured on the B6 circuit of the return oil distributor block of the excitation circuit module 2. By quickly closing the quick-cut solenoid valve 2.13, the flow of this branch circuit can be cut off, generating a large pressure shock. Based on the above-mentioned pressure shock effect, a series of hydraulic shock tests can be carried out on the tested pipeline 7.

[0063] In view of the various specifications and load changes of the tested pipelines 7, the six relatively independent circuits of the excitation circuit module 2 share a pump source system, and the configuration of each branch element is different, so that each circuit has different hydraulic functional properties such as pressure and flow, so that the complex and changeable hydraulic load states of the engine and the tested pipelines 7 can be simulated more flexibly.

[0064] In one embodiment, each connection port in the hydraulic circuit of the present invention uniformly adopts the British pipe thread (G thread) end face rubber gasket sealing form, all pipe joints use 24° cone ferrule joints (DIN8434 standard), and the steel pipes used for connection in the excitation circuit module 2 in the system except for the high-pressure hose 2.14 are precision-drawn galvanized steel pipes (DIN2391 standard) to reduce the internal pipeline connections of the system, while ensuring that the oil circuit realizes high-standard design of interfaces and pipelines in the valve block, ensuring the reliability of the system, and preventing the occurrence of "leakage".

[0065] The oil status management module 3 includes a filling cap 3.1, a water-cooling pump 3.2, a plate heat exchanger 3.3, a precision filter 3.4, a water chiller 3.5, and a detection element, forming a bypass filtration cooling system. The detection element includes the first pressure sensor 1.10 of the excitation pump source module 1, the second pressure sensor 2.6 of the excitation circuit module 2, a low-pressure, high-precision pressure sensor 2.7, and a flow sensor 2.10. The filling cap 3.1 has a built-in filter and is mounted on the hydraulic oil tank 1.4. The oil inlet of the water-cooling pump 3.2 is connected to the hydraulic oil tank 1.4, and the oil outlet of the water-cooling pump 3.2 is connected to the oil inlet of the plate heat exchanger 3.3. The plate heat exchanger 3.3 is mounted on top of the hydraulic pump station 1.12, and the oil outlet of the plate heat exchanger 3.3 is connected to the hydraulic oil tank 1.4. A precision filter 3.4 is installed between the plate heat exchanger 3.3 and the hydraulic oil tank 1.4. This filter has a filtration accuracy of 3u, ensuring that the hydraulic oil used in the hydraulic test rig maintains a cleanliness level of NAS7 or higher. The water cooling circuit of the plate heat exchanger 3.3 is connected to a water chiller 3.5 via a water pipe. This chiller 3.5 is located outside the laboratory wall 3.6. Considering the laboratory's environmental requirements for heat dissipation, the chiller 3.5 is installed outside the laboratory to provide a refrigerant medium that removes heat. It has a cooling power of 12 kW and a chilled water temperature control of ±1°C.

[0066] The electric control system module 5 includes an electric control box 5.1, a PLC module, a frequency converter, a visual operation console 5.2, a host computer 5.3, shielded cables, and a sheath. The PLC module, the frequency converter, and the cables connected thereto are fixedly installed in the electric control box 5.1. The electric control box 5.1 is fixedly installed on the ground and arranged on one side of the hydraulic pump station 1.12. The visual operation console 5.2 is connected to the PLC module via shielded cables, and the host computer 5.3 is connected to the PLC module and the detection element via shielded cables.

[0067] In an embodiment of the present invention, the vibration ground simulation test device is controlled and tested via the PLC module, frequency converter, and visual console 5.2 within the electronic control system module 5. System control and monitoring data are displayed in real time on the touch screen of the visual console 5.2. The electronic control system can configure process cards based on different test conditions, facilitating data transfer. The electronic control system module 5 is conveniently interconnected with a host computer 5.3 via a bus or network cable. Pressure, flow, and temperature data at both ends of the tested pipeline 7 in the six-channel test loop corresponding to the six branches of the vibration loop module 2 can be directly uploaded to the host computer 5.3.

[0068] In the embodiment of the present application, the electric control system module 5 adopts a distributed I / O bus form, each input and output terminal adopts a fault-tolerant plug, a plug-in or an aviation plug, all signal lines adopt shielded lines, and the wiring is neat and beautiful; the wiring between the visual operation platform 5.2, the electric control box 5.1, the hydraulic pump station 1.12 and the upper computer 5.3 is protected by a sheath.

Claims

1. A hydraulic vibration ground simulation test device for an aircraft engine hydraulic piping system, characterized by: include: A base (6) for simulating the base excitation generated by the aircraft engine; A pipeline fixing and detection module (4) is fixedly mounted on a simulated casing mounted on a base (6); An excitation circuit module (2), wherein the pipeline to be tested is connected to the excitation circuit module (2) via a pipeline fixing and detection module (4); An excitation pump source module (1) is connected to the excitation circuit module (2) and is used to apply a fluid dynamic load to the measured pipeline connected to the excitation circuit module (2); The oil state management module (3) is connected to the excitation circuit module (2) and is used to monitor the oil state in real time to ensure the reliable operation of the hydraulic excitation simulation test device; The electronic control system module (5) is connected to the excitation pump source module (1), the excitation circuit module (2) and the oil state management module (3) respectively, and is used to realize real-time monitoring, control and display of four key indicators of oil pressure, flow, oil temperature and cleanliness; The excitation circuit module (2) includes an outlet oil separator block and a return oil separator block, the outlet oil separator block and the return oil separator block are fixedly mounted on the hydraulic oil tank (1.4) of the excitation pump source module (1), the oil inlet of the outlet oil separator block is connected to the main oil circuit of the oil outlet of the constant pressure variable piston pump in the excitation pump source module (1), and the oil outlet of the return oil separator block is connected to the hydraulic oil tank (1.4) of the excitation pump source module (1), forming the main oil circuit; The pipeline fixing and detection module (4) is arranged between the outlet oil separation block and the return oil separation block of the excitation circuit module (2), and includes an inlet detection block (4.2), an outlet detection block, a pressure sensor, and a data acquisition device (4.1) electrically connected thereto. The inlet detection block (4.2) and the outlet detection block (4.3) are fixed to the simulated casing of the base (6) by bolt connection. The oil inlet of the outlet oil distributor block is divided into six, forming six relatively independent circuit oil outlets, namely A1, A2, A3, A4, A5, and A6. A second pressure gauge (2.2) and a manual high-pressure ball valve (2.3) for the outlet oil distributor block branch are installed on the six circuit oil outlets. A pressure reducing valve (2.1) is also installed on the A4 circuit, and a diaphragm accumulator (2.4) and a high-pressure ball valve (2.5) are also installed on the A5 circuit. The oil outlets of the six circuit oil outlets of the outlet oil distributor block are connected to the inlet detection block (4.2) of the three circuits through high-pressure hoses. A1, A2 , A3 is connected to the inlet detection block a, A4, A5, and A6 are connected to the inlet detection block b; the circuit of the inlet detection block (4.2) corresponds to the six circuit oil outlets of the outlet oil distribution block connected thereto, and the five circuits corresponding to A1, A2, A4, A5, and A6 of the inlet detection block (4.2) are all equipped with a high-precision, high-sensitivity second pressure sensor (2.6), and the circuit corresponding to A3 is equipped with two low-pressure, high-precision pressure sensors (2.7) with shut-off valves; The six circuits composed of the inlet detection block a and the inlet detection block b are connected to the six branch oil inlets of the outlet detection block (4.3) through the tested pipelines. The six circuits of the outlet detection block (4.3) are connected to the six branch oil inlets B1, B2, B3, B4, B5, and B6 of the return oil distribution block. B1, B2, B3, B4, B5, and B6 are connected to A1 and A2 respectively. , A3, A4, A5, A6 correspond one to one; the six circuits corresponding to B1, B2, B4, B5, and B6 of the outlet detection block (4.3) are all equipped with high-precision, high-sensitivity second pressure sensors (2.6), and the circuit corresponding to B3 is equipped with two low-pressure, high-precision pressure sensors (2.7) with shut-off valves; the six branch oil outlets of the return oil distributor block are all equipped with return oil distributor block branch manual high-pressure ball valves (2.8), B1 and B2 are also equipped with proportional flow valves (2.9) and flow sensors (2.10), B3 and B4 are also equipped with overflow valves (2.11), B5 is equipped with a manual throttle valve (2.12), and B6 is equipped with a quick-cut solenoid valve (2.13).

2. The hydraulic vibration ground simulation test device for an aircraft engine hydraulic pipeline system according to claim 1, characterized in that: The base (6) is a common rigid support or a vibration table, fixedly connected to the ground.

3. The hydraulic vibration ground simulation test device for an aircraft engine hydraulic pipeline system according to claim 1, characterized in that: The excitation pump source module (1) includes a hydraulic oil tank (1.4), and a manual high-pressure ball valve (1.1), a pressure relay (1.2), and a liquid level gauge (1.3) are installed at the bottom of one side of the hydraulic oil tank (1.4); the oil inlet of the constant-pressure variable plunger pump (1.7) is connected to the hydraulic oil tank (1.4) through an oil suction filter (1.5); a one-way valve (1.8) is installed on the main oil line of the oil outlet of the constant-pressure variable plunger pump (1.7), and a normally open electromagnetic overflow valve (1.9), a first pressure gauge (1.11), and a first pressure sensor (1.10) are installed on the bypass line; the normally open electromagnetic overflow valve (1.9) is connected to the hydraulic oil tank (1.4); The first pressure sensor (1.10) is a high-precision, high-sensitivity pressure sensor; The constant pressure variable displacement plunger pump (1.7) is connected to the variable frequency motor (1.6) and fixedly installed together on the hydraulic pump station (1.12), and the constant pressure variable displacement plunger pump (1.7) is driven by the variable frequency motor (1.6); The constant pressure variable displacement plunger pump (1.7) is a 9-plunger high-pressure plunger pump commonly used in aircraft engines. It has a rated pressure of 315 Bar, a maximum displacement of 28 cc, a speed range of 600-3200 rpm, a maximum pressure of 350 Bar, a cut-off pressure that can be manually adjusted, and a geometric displacement that can be manually adjusted between 17.8 and 28.7 cc. It can simulate pressure pulsations within a high-frequency bandwidth range of 90-480 Hz.

4. The hydraulic vibration ground simulation test device for an aircraft engine hydraulic pipeline system according to claim 1, characterized in that: The outlet oil separation block includes six circuit oil outlets, each of which is connected to the oil inlet of the inlet detection block (4.2) via a high-pressure hose (2.14); the tested pipeline is connected between the oil outlet of the inlet detection block (4.2) and the oil inlet of the outlet detection block (4.3); the return oil separation block includes six branch oil inlets, each of which is connected to the oil outlet of the outlet detection block (4.3) via a high-pressure hose (2.14); the six branch oil outlets of the return oil separation block are connected to the hydraulic oil tank (1.4); Each branch between the inlet detection block (4.2) and the outlet detection block (4.3) can be directly connected to a single pipeline to be tested, or can be connected in series or in parallel to multiple pipelines to be tested as needed.

5. The hydraulic excitation ground simulation test device for an aircraft engine hydraulic pipeline system according to claim 1, characterized in that: A pressure reducing valve (2.1) is installed on A3 of the outlet oil distribution block of the excitation circuit module (2), and overflow valves (2.11) are installed in B3 and B4 of the return oil distribution block; a diaphragm accumulator (2.4) is set in A5 of the outlet oil distribution block of the excitation circuit module (2), and the diaphragm accumulator (2.4) can be connected to the circuit by opening the high-pressure ball valve (2.5) of the diaphragm accumulator (2.4). Under normal pipeline testing conditions, the accumulator (2.4) can be isolated from the test circuit by closing the high-pressure ball valve (2.5).

6. The hydraulic excitation ground simulation test device for an aircraft engine hydraulic pipeline system according to claim 1, characterized in that: A quick-cut solenoid valve (2.13) is configured on the B6 circuit of the return oil distributor block of the excitation circuit module (2). The flow of this branch can be cut off by quickly closing the quick-cut solenoid valve (2.13).

7. The hydraulic vibration ground simulation test device for an aircraft engine hydraulic pipeline system according to claim 1, characterized in that: The oil state management module (3) comprises a filling cap (3.1), a water-cooling pump (3.2), a plate heat exchanger (3.3), a precision filter (3.4), a water cooler (3.5), and a detection element. The filling cap (3.1) has a built-in filter and is installed on the hydraulic oil tank (1.4) of the excitation pump source module (1); the oil inlet of the water-cooling pump (3.2) is connected to the hydraulic oil tank (1.4), and the oil outlet of the water-cooling pump (3.2) is connected to the oil inlet of the plate heat exchanger (3.3); the plate heat exchanger (3.3) is installed on the top of the hydraulic pump station (1.12), and the oil outlet of the plate heat exchanger (3.3) is connected to the hydraulic oil tank (1.4); a precision filter (3.4) is installed between the plate heat exchanger (3.3) and the hydraulic oil tank (1.4); the water cooling circuit of the plate heat exchanger (3.3) is connected to the water cooler (3.5) through a water pipe; The detection elements include a first pressure sensor (1.10) of the excitation pump source module (1), a second pressure sensor (2.6) of the excitation loop module (2), a low-pressure high-precision pressure sensor (2.7), and a flow sensor (2.10).

8. The hydraulic excitation ground simulation test device for an aircraft engine hydraulic pipeline system according to claim 7, characterized in that: The electric control system module (5) comprises an electric control box (5.1), a PLC module, a frequency converter, a visual operating console (5.2), a host computer (5.3), a shielded cable, and a sheath, wherein the PLC module and the frequency converter, as well as the cables connected thereto, are fixedly installed in the electric control box (5.1), the electric control box (5.1) is fixedly installed on the ground and arranged on one side of the hydraulic pump station (1.12), the visual operating console (5.2) is connected to the PLC module via a shielded cable, and the host computer (5.3) is connected to the PLC module and the detection element via a shielded cable.

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