Aircraft hydraulic pipeline pressure pulsation and vibration suppression system and design method thereof

Abstract

The invention belongs to the technical field of aircraft hydraulic pipeline pressure pulsation and vibration suppression design, and particularly relates to an aircraft hydraulic pipeline pressure pulsation and vibration suppression system and a design method thereof.The aircraft hydraulic pipeline pressure pulsation and vibration suppression system comprises a vibration absorber, a pressure accumulator, a rubber single-hole pipe clamp and a metal single-hole pipe clamp; the vibration absorber, the pressure accumulator, the rubber single-hole pipe clamp and the metal single-hole pipe clamp are arranged on the hydraulic pipeline, and the rubber single-hole pipe clamp and the metal single-hole pipe clamp are connected to the machine body structure through the pipeline support. An inlet of the hydraulic pipeline is connected with an outlet of the hydraulic pump, and an outlet of the hydraulic pipeline is connected with an inlet of the hydraulic load. The vibration absorber is arranged at an inlet of the hydraulic pipeline, close to an outlet of the hydraulic pump and located on the upstream of the one-way oil supply valve, and the pressure accumulator is arranged between the high-pressure oil filter and the hydraulic load; a plurality of rubber single-hole pipe clamps and a plurality of metal single-hole pipe clamps are distributed on the hydraulic pipeline.

Description

Technical Field

[0001] This application belongs to the field of aircraft hydraulic pipeline pressure pulsation and vibration suppression design technology, specifically relating to an aircraft hydraulic pipeline pressure pulsation and vibration suppression system and its design method. Background Technology

[0002] Aircraft hydraulic systems have numerous users and are distributed across a wide area, resulting in a dense and complex network of hydraulic lines throughout the aircraft.

[0003] The hydraulic lines on an aircraft are subjected to internal pressure pulsations and external airframe vibrations, resulting in a very complex stress situation. Frequently, due to excessive pressure pulsations and vibration amplitudes, the hydraulic lines and their supports may experience excessive stress and breakage, affecting the safety of the hydraulic system and impacting the aircraft's safe flight and mission capabilities. Therefore, this application is hereby submitted. Summary of the Invention

[0004] The purpose of this application is to provide an aircraft hydraulic pipeline pressure pulsation and vibration suppression system and its design method, which can suppress aircraft hydraulic pipeline pressure pulsation and vibration, prevent hydraulic pipelines and their supports from exceeding stress limits and breaking, ensure the safety of the hydraulic system, and ensure the safe flight and mission completion capability of the aircraft.

[0005] Overcome or mitigate at least one of the known technical defects.

[0006] The technical solution of this application is:

[0007] This application provides a system for suppressing pressure pulsation and vibration in aircraft hydraulic lines, including a damper, an accumulator, a rubber single-hole clamp, and a metal single-hole clamp.

[0008] Vibration dampers, accumulators, rubber single-hole pipe clamps, and metal single-hole pipe clamps are installed on the hydraulic pipelines. The rubber single-hole pipe clamps and metal single-hole pipe clamps are connected to the machine body structure through pipeline supports.

[0009] The hydraulic pipeline inlet is connected to the hydraulic pump outlet, and the outlet is connected to the hydraulic load inlet. A one-way oil supply valve and a high-pressure oil filter are installed sequentially on the hydraulic pipeline.

[0010] The vibration damper is installed at the inlet of the hydraulic line, near the outlet of the hydraulic pump, and upstream of the one-way oil supply valve. The accumulator is installed between the high-pressure oil filter and the hydraulic load.

[0011] There are multiple rubber single-hole pipe clamps and metal single-hole pipe clamps, distributed on the hydraulic pipeline.

[0012] According to at least one embodiment of this application, in the above-mentioned aircraft hydraulic pipeline pressure pulsation and vibration suppression system, the hydraulic pipeline is connected to a ground high-pressure oil source through a high-pressure pipeline, and the connection node of the high-pressure pipeline on the hydraulic pipeline is located between a one-way oil supply valve and a high-pressure oil filter. A pressure valve may be installed on the high-pressure pipeline.

[0013] The hydraulic pump is a piston pump. Its inlet is connected to the outlet of the hydraulic oil tank through a low-pressure pipeline. The inlet of the hydraulic oil tank is connected to the outlet of the hydraulic load through a main return oil pipeline. A main return oil filter is installed on the main return oil pipeline, and the return oil port of the hydraulic pump is connected through a secondary return oil pipeline. The connection node of the secondary return oil pipeline on the main return oil pipeline is located between the main return oil filter and the hydraulic oil tank. A secondary return oil filter and a one-way return oil valve are installed in sequence on the secondary return oil pipeline.

[0014] According to at least one embodiment of this application, in the above-mentioned aircraft hydraulic pipeline pressure pulsation and vibration suppression system, the vibration damper is an airbag type pressure pulsation damper.

[0015] The accumulator is a hydraulic accumulator.

[0016] According to at least one embodiment of this application, in the above-described aircraft hydraulic line pressure pulsation and vibration suppression system,

[0017] Rubber single-hole pipe clamps and metal single-hole pipe clamps adopt a clamp structure, with the two halves connected by bolts and clamped onto the hydraulic pipeline;

[0018] The pipe support has an L-shaped structure. One side panel is bolted to a rubber single-hole pipe clamp and a metal single-hole pipe clamp, while the other side panel is bolted to the machine body structure.

[0019] According to at least one embodiment of this application, in the above-described aircraft hydraulic line pressure pulsation and vibration suppression system, a metal single-hole pipe clamp is provided at a location where pressure pulsation generates significant stress on the hydraulic line, including the hydraulic pump outlet location.

[0020] Rubber single-hole pipe clamps are installed at locations where vibrations of the aircraft body cause significant stress to the hydraulic lines and their supports, including the aircraft engine location.

[0021] On the other hand, a design method for an aircraft hydraulic pipeline pressure pulsation and vibration suppression system is provided, which designs the number and positional distribution of rubber single-hole clamps and metal single-hole clamps in the aforementioned aircraft hydraulic pipeline pressure pulsation and vibration suppression system, including:

[0022] A three-dimensional pipeline and finite element model of the pressure pulsation and vibration suppression system of aircraft hydraulic pipelines is constructed. Excitation is applied to the hydraulic pipelines and their supports to simulate the internal pressure pulsation of the hydraulic pipelines and the external vibration of the aircraft body, and the stress distribution and vibration frequency and amplitude on the hydraulic pipelines and their supports are obtained.

[0023] If the stress distribution, vibration frequency, and amplitude on the hydraulic pipeline and its supports do not meet the design requirements, the number of rubber single-hole clamps and metal single-hole clamps and their position distribution on the hydraulic pipeline should be readjusted until the stress distribution, vibration frequency, and amplitude on the hydraulic pipeline and its supports meet the design requirements.

[0024] This application has at least the following beneficial technical effects:

[0025] This invention provides a system for suppressing pressure pulsation and vibration in aircraft hydraulic lines and its design method. The system uses dampers, accumulators, rubber single-hole clamps, and metal single-hole clamps in combination to reduce the stress on hydraulic lines and line supports caused by internal pressure pulsation and external airframe vibration. This system can reliably fix the hydraulic lines and effectively prevent the breakage of hydraulic lines and line supports. Attached Figure Description

[0026] Figure 1 This is a schematic diagram provided in an embodiment of this application;

[0027] Figure 2 This is a simulation comparison diagram showing the effect of installing a vibration damper and an accumulator on a hydraulic pipeline to suppress pressure pulsation at the hydraulic pump outlet, as provided in the embodiments of this application.

[0028] Figure 3 This is a schematic diagram of the rubber single-hole pipe clamp, metal single-hole pipe clamp and pipe support provided in the embodiments of this application;

[0029] Figure 4 This is a schematic diagram of the rubber single-hole pipe clamp, metal single-hole pipe clamp and their pipe support provided in the embodiments of this application installed on a hydraulic pipeline;

[0030] Figure 5 This is a comparison diagram of the stress response simulation results on a single hydraulic titanium alloy pipeline with rubber single-hole pipe clamps and metal single-hole pipe clamps distributed on the pipeline, as provided in the embodiments of this application.

[0031] Figure 6 This is a comparison diagram of the stress response simulation results of rubber single-hole pipe clamps and metal single-hole pipe clamps distributed on a single hydraulic titanium alloy pipeline, provided in the embodiments of this application.

[0032] in:

[0033] 1-Vibration damper; 2-Accumulator; 3-Rubber single-hole pipe clamp; 4-Metal single-hole pipe clamp; 5-Pipeline support; 6-Hydraulic pump; 7-Hydraulic load; 8-One-way oil supply valve; 9-High-pressure oil filter; 10-Hydraulic oil tank; 11-Main return oil filter; 12-Secondary return oil filter; 13-One-way return oil valve; 14-Ground high-pressure oil source; 15-Pressure valve.

[0034] To better illustrate this embodiment, some content in the accompanying drawings may be omitted, enlarged, or reduced. They are for illustrative purposes only and should not be construed as limiting the scope of this application. Detailed Implementation

[0035] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.

[0036] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The word "comprising" as used in this application description indicates that the concept preceding the word encompasses the concepts listed following the word and their equivalents, without excluding other related concepts.

[0037] Furthermore, the terms indicating location used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0038] A system for suppressing pressure pulsation and vibration in aircraft hydraulic lines, such as Figure 1 As shown, there are vibration damper 1, accumulator 2, rubber single-hole pipe clamp 3, and metal single-hole pipe clamp 4.

[0039] Vibration damper 1, accumulator 2, rubber single-hole pipe clamp 3, and metal single-hole pipe clamp 4 are installed on the hydraulic pipeline. The rubber single-hole pipe clamp 3 and metal single-hole pipe clamp 4 are connected to the machine body structure through the pipeline support 5.

[0040] The hydraulic pipeline inlet is connected to the outlet of the hydraulic pump 6, and the outlet is connected to the inlet of the hydraulic load 7. A one-way oil supply valve 8 and a high-pressure oil filter 9 can be installed sequentially on the hydraulic pipeline, and a high-pressure oil source 14 on the ground can be connected through a high-pressure pipeline. The connection node of the high-pressure pipeline on the hydraulic pipeline is located between the one-way oil supply valve 8 and the high-pressure oil filter 9. A pressure valve 15 can be installed on the high-pressure pipeline.

[0041] The hydraulic pump 6 can be a piston pump. Its inlet is connected to the outlet of the hydraulic oil tank 10 through a low-pressure pipeline. The inlet of the hydraulic oil tank 10 is connected to the outlet of the hydraulic load 7 through a main return oil pipeline. A main return oil filter 11 can be installed on the main return oil pipeline, and the return oil port of the hydraulic pump 6 is connected through a secondary return oil pipeline. The connection node of the secondary return oil pipeline on the main return oil pipeline is located between the main return oil filter 11 and the hydraulic oil tank 10. A secondary return oil filter 12 and a one-way return oil valve 13 can be installed sequentially on the secondary return oil pipeline.

[0042] Vibration damper 1 can be an airbag type pressure pulsation damper, which is installed at the inlet of the hydraulic line, near the outlet of the hydraulic pump 6, and upstream of the one-way oil supply valve 8. Accumulator 2 can be a hydraulic accumulator, which is installed between the high-pressure oil filter 9 and the hydraulic load 7, so as to reduce the pressure pulsation inside the hydraulic line from the source, and reduce the overall pressure pulsation value from the hydraulic pump 6 to the high-pressure oil filter 9 and the hydraulic load 7, as well as from the hydraulic pump 6 to the pressure valve 15, thereby reducing the pulsation stress of the hydraulic line.

[0043] In a specific example, the simulation compares the effect of installing damper 1 and accumulator 2 on suppressing the pressure pulsation at the outlet of hydraulic pump 6 in the hydraulic pipeline. Figure 2 As shown in the figure, the comparison shows that installing damper 1 and accumulator 2 on the hydraulic pipeline has a good effect on suppressing the pressure pulsation at the outlet of hydraulic pump 6.

[0044] The rubber single-hole pipe clamp 3 and the metal single-hole pipe clamp 4 can adopt a clamp structure, with the two halves connected by bolts and tightened onto the hydraulic pipeline. The pipeline support 5 can be designed in an L-shape, with one side panel bolted to the rubber single-hole pipe clamp 3 or the metal single-hole pipe clamp 4, and the other side panel bolted to the machine body structure. Figure 3 , 4 As shown.

[0045] In a specific experiment, rubber single-hole pipe clamps 3 and metal single-hole pipe clamps 4 were distributed on a single hydraulic titanium alloy pipeline. The rubber single-hole pipe clamps 3 and metal single-hole pipe clamps 4 were installed and fixed using pipeline supports 5 of the same size and with consistent spatial orientation. A three-dimensional pipeline and finite element model were constructed, and a certain vibration excitation was applied to the fixed constraint part of the pipeline support 5 for simulation. The stress response results on the pipeline were obtained as follows: Figure 5 As shown, the stress response results on the rubber single-hole pipe clamp 3 and the metal single-hole pipe clamp 4 are as follows: Figure 6 As shown.

[0046] Using a metal single-hole pipe clamp 4 can better secure the hydraulic pipeline and reduce the stress caused by internal pressure pulsation in the hydraulic pipeline. It is suitable for installation at locations where pressure pulsation causes significant stress to the hydraulic pipeline, such as near the outlet of the hydraulic pump 6.

[0047] The use of rubber single-hole pipe clamp 3 can better absorb vibration energy, reduce the stress on hydraulic lines caused by airframe vibration, and reduce the stress on pipe support 5 caused by hydraulic line vibration. It is suitable for installation in locations where airframe vibration causes greater stress on hydraulic lines and their pipe support 5, such as near the aircraft engine.

[0048] Under complex working conditions of pressure pulsation and machine vibration, the number of rubber single-hole clamps 3 and metal single-hole clamps 4 and their position distribution on the hydraulic pipeline can be designed according to the stress conditions of the hydraulic pipeline. By matching the use of rubber single-hole clamps 3 and metal single-hole clamps 4, a moderately soft and hard fixing method can be designed for the hydraulic pipeline. The stress conditions of the hydraulic pipeline and the pipeline support 5 can be reasonably controlled. This can not only achieve reliable fixing of the hydraulic pipeline, but also prevent excessive transmission of machine vibration energy to the hydraulic pipeline, thus effectively avoiding the problem of hydraulic pipeline and pipeline support 5 breakage.

[0049] The design of the aircraft hydraulic pipeline pressure pulsation and vibration suppression system mainly involves designing the number of rubber single-hole clamps 3 and metal single-hole clamps 4 and their positional distribution on the hydraulic pipeline. The following method can be used as a reference:

[0050] A three-dimensional pipeline and finite element model of the pressure pulsation and vibration suppression system of the aircraft hydraulic pipeline was constructed. Excitation was applied to the hydraulic pipeline and its pipeline support 5 to simulate the internal pressure pulsation of the hydraulic pipeline and the external vibration of the aircraft body, and the stress distribution and vibration frequency and amplitude on the hydraulic pipeline and its pipeline support 5 were obtained.

[0051] If the stress distribution and vibration frequency and amplitude on the hydraulic pipeline and its pipeline support 5 do not meet the design requirements, i.e. there is a risk of breakage, then the number of rubber single-hole pipe clamps 3 and metal single-hole pipe clamps 4 and their position distribution on the hydraulic pipeline should be readjusted until the stress distribution and vibration frequency and amplitude on the hydraulic pipeline and its pipeline support 5 meet the design requirements.

[0052] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the protection scope of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this application.

Claims

1. An aircraft hydraulic line pressure pulsation and vibration suppression system, characterized by, The shock absorber (1), the pressure accumulator (2), the rubber single-hole pipe clamp (3), and the metal single-hole pipe clamp (4) are arranged on the hydraulic pipeline, and the rubber single-hole pipe clamp (3) and the metal single-hole pipe clamp (4) are connected to the machine body structure through the pipeline support (5). The hydraulic pipeline is connected to the outlet of the hydraulic pump (6) at the inlet, and is connected to the inlet of the hydraulic load (7) at the outlet, and the one-way oil supply valve (8) and the high-pressure oil filter (9) are arranged on the hydraulic pipeline in sequence. The shock absorber (1) is arranged at the inlet of the hydraulic pipeline, close to the outlet of the hydraulic pump (6), upstream of the one-way oil supply valve (8), and the pressure accumulator (2) is arranged between the high-pressure oil filter (9) and the hydraulic load (7). There are multiple rubber single-hole pipe clamps (3) and metal single-hole pipe clamps (4) distributed on the hydraulic pipeline.

2. The aircraft hydraulic pipeline pressure pulsation and vibration suppression system according to claim 1, wherein The hydraulic pipeline is connected to the ground high-pressure oil source (14) through a high-pressure pipeline, and the connection node of the high-pressure pipeline on the hydraulic pipeline is between the one-way oil supply valve (8) and the high-pressure oil filter (9), and a pressure valve (15) can be arranged on the high-pressure pipeline. The hydraulic pump (6) is a plunger pump, the inlet is connected to the outlet of the hydraulic oil tank (10) through a low-pressure pipeline, the inlet of the hydraulic oil tank (10) is connected to the outlet of the hydraulic load (7) through a main oil return pipeline, a main oil return filter (11) is arranged on the main oil return pipeline, and a secondary oil return pipeline is connected to the oil return port of the hydraulic pump (6), and the connection node of the secondary oil return pipeline on the main oil return pipeline is between the main oil return filter (11) and the hydraulic oil tank (10), and the secondary oil return filter (12) and the one-way oil return valve (13) are arranged on the secondary oil return pipeline in sequence.

3. The aircraft hydraulic pipeline pressure pulsation and vibration suppression system according to claim 2, wherein The shock absorber (1) is a gas bag type pressure pulsation absorber. The pressure accumulator (2) is a hydraulic pressure accumulator.

4. The aircraft hydraulic pipeline pressure pulsation and vibration suppression system according to claim 3, wherein The rubber single-hole pipe clamp (3) and the metal single-hole pipe clamp (4) adopt a clamp structure, and are connected by bolts between the two halves and clamped on the hydraulic pipeline. The pipeline support (5) is an L-shaped structure, one side wall plate is connected to the rubber single-hole pipe clamp (3) and the metal single-hole pipe clamp (4) by bolts, and the other side wall plate is connected to the machine body structure by bolts.

5. The aircraft hydraulic pipeline pressure pulsation and vibration suppression system according to claim 4, wherein The metal single-hole pipe clamp (4) is arranged at positions where pressure pulsation generates relatively large stress on the hydraulic pipeline, including the outlet position of the hydraulic pump (6); The rubber single-hole pipe clamp (3) is arranged at positions where machine body vibration generates relatively large stress on the hydraulic pipeline and its pipeline support (5), including the position of the aircraft engine. The shock absorber (1), the pressure accumulator (2), the rubber single-hole pipe clamp (3), and the metal single-hole pipe clamp (4) are arranged on the hydraulic pipeline, and the rubber single-hole pipe clamp (3) and the metal single-hole pipe clamp (4) are connected to the machine body structure through the pipeline support (5).

6. A method for designing the number and the position distribution of the rubber single-hole pipe clamp (3) and the metal single-hole pipe clamp (4) in the aircraft hydraulic pipeline pressure pulsation and vibration suppression system of claim 5, characterized in that, ​ A three-dimensional pipeline and finite element model of the aircraft hydraulic pipeline pressure pulsation and vibration suppression system is constructed, an excitation is applied on the hydraulic pipeline and its pipeline support (5), the internal pressure pulsation of the hydraulic pipeline and its external body vibration are simulated, and the stress distribution and vibration frequency and amplitude of the hydraulic pipeline and its pipeline support (5) are obtained; If the stress distribution and vibration frequency and amplitude of the hydraulic pipeline and its pipeline support (5) do not meet the design requirements, the number and position distribution of the rubber single-hole pipe clamp (3) and the metal single-hole pipe clamp (4) on the hydraulic pipeline are adjusted again until the stress distribution and vibration frequency and amplitude of the hydraulic pipeline and its pipeline support (5) meet the design requirements.

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