Pressure Pulsation Analysis of Aircraft Hydraulic Power Pipelines System

2010 ◽  
Vol 97-101 ◽  
pp. 2861-2864 ◽  
Author(s):  
Wei Liu ◽  
Tao Wei ◽  
Zhu Feng Yue
Keyword(s):  
Hydraulic System ◽  
Pressure Pulsation ◽  
Excitation Frequency ◽  
Pipeline System ◽  
Transient Pressure ◽  
Hydraulic Power ◽  
Network Chain ◽  
Output Pressure ◽  
Fluid Network ◽  
Pulsation Model

The output pressure pulsation model for the aircraft hydraulic power pipelines was established by the methods of transfer function and fluid network chain-rules; the dissipation caused by frequency-dependent friction was taken into account. Dynamic characteristics of hydraulic system were discussed in frequency-domain and time-domain respectively, the pumping excitation frequency influenced the frequency-response of hydraulic pipeline system, and several resonance frequency bands were obtained. The inverse fast Fourier transform was applied to simulate the transient pressure pulsation waves under pump starting and steady-running state.

Dynamic Response of the Pipe Conveying Fluid with the Pressure Pulsation

2015 ◽  
Vol 1094 ◽  
pp. 491-494 ◽  
Author(s):  
Hong Bo Zhai ◽  
Jian Jun Su ◽  
Xiao Min Yan ◽  
Wei Liu
Keyword(s):  
Dynamic Response ◽  
Pressure Pulsation ◽  
Fluid Pressure ◽  
Response Characteristic ◽  
Pipe Conveying Fluid ◽  
Hydraulic Power ◽  
Working Pressure ◽  
Pipe System ◽  
Output Pressure ◽  
Conveying Fluid

The dynamic response characteristic of the pipe conveying fluid was researched with the fluid pressure pulsation in this article. For some hydraulic power pipe system, formed the mathematic models and the transfer matrices of the main hydraulic elements based on the fluid network algorithm, deduced the calculation formulae of input-output pressure pulsation, gained the transitive relationship of the fluid flow pulsation and pressure pulsation, and then studied the pressure pulsation amplitude of the hydraulic power pipes with different working pressures. This study, which analyzed the dynamic response of the pipe conveying fluid and discussed the feasibility of increasing the working pressure, is valuable for the design and the application of the pipes conveying fluid.

scholarly journals The impact of the simple orifice schemes of the buffer device in boom refuelling system in the transient pressure of the pipeline

2021 ◽  
Vol 233 ◽  
pp. 04015
Author(s):  
Zhangzhi Dong ◽  
Xiaogang Li ◽  
Yanyan Hou ◽  
Bin Li ◽  
Yujuan He
Keyword(s):  
System Reliability ◽  
Pressure Pulsation ◽  
Simulation Analysis ◽  
Pipeline System ◽  
Transient Pressure ◽  
Pressure Shock ◽  
Flow Area ◽  
Suppression Effect ◽  
Pressure Peak ◽  
The Impact

The boom refuelling system has a large refueling flow, and the refueling joint when the refueling is interrupted in an emergency will cause pressure shock and pressure pulsation. In severe cases, it will cause vibration of the pipeline system, reduce system reliability, and seriously endanger flight safety. Adding a device similar to an accumulator at the end of the pipeline where pressure shock occurs can well absorb the shock pressure. This paper uses a certain type of aircraft as a background to simulate the construction of a rigid air refueling pipeline system with a buffer device. The emphasis is on the pressure shock suppression characteristics of the buffer device. The simulation analysis of the opening parameters of the expansion cavity entrance includes the number and size of the buffer device. The impact of pressure shock performance. The results show that: the more openings and the larger the pore size, the larger the first pressure peak and the smaller the second pressure peak; while increasing the total flow area can effectively reduce the pressure shock suppression effect of the buffer device.

Fast algorithm for calculating the pressure pulsation in a reciprocating compressor system with stepless capacity regulation

2019 ◽  
Vol 233 (6) ◽  
pp. 1280-1291
Author(s):  
Lanlan Yang ◽  
Xiaohan Jia ◽  
Haojie Qi ◽  
Jianmei Feng ◽  
Xueyuan Peng ◽  
...  
Keyword(s):  
Fast Algorithm ◽  
Pressure Pulsation ◽  
Negative Impact ◽  
Dynamic Pressure ◽  
Excitation Frequency ◽  
Pipeline System ◽  
Domain Modeling ◽  
Closing Time ◽  
Delayed Closure ◽  
Good Agreement

Stepless capacity regulation through delayed closure of suction valves plays an important role in energy conservation for reciprocating compressors. Serious gas pulsation usually occurs with a suction valve unloader, and its analysis and suppression is a challenge owing to the varied components of the pulsation excitation under different conditions. In this study, a fast algorithm was proposed to calculate the gas pulsation of a compressor system with stepless capacity regulation and was further incorporated into the frequency-domain modeling of the gas pulsation. A test rig was constructed, and the model was experimentally verified. The dynamic pressure at positions in the suction and discharge valve chambers was measured, as the compressor capacity was varied by changing the closing time of the suction valves. The experimental data were compared with the simulated results and indicated a good agreement. The results showed that the suction valve unloader had a negative impact on the gas pulsation in the suction pipeline system. The pressure pulsation of the main excitation frequency increased in the suction pipeline system and decreased in the discharge pipeline, as the opening time of the suction valve increased.

Optimization of pipeline system with multi-hoop supports for avoiding vibration, based on particle swarm algorithm

2020 ◽  
pp. 095440622094711 ◽  
Author(s):  
Xudong Liu ◽  
Wei Sun ◽  
Ye Gao ◽  
Hui Ma
Keyword(s):  
Excitation Frequency ◽  
Particle Swarm ◽  
Element Model ◽  
Optimization Method ◽  
Operational Reliability ◽  
Particle Swarm Algorithm ◽  
Pipeline System ◽  
Pipe System ◽  
Swarm Algorithm ◽  
Single Pipe

In the dynamics design of aero-engine pipeline systems, it is necessary to avoid the excitation frequency of the engine (mainly including the rotational frequencies of high pressure and low pressure rotor systems) to improve the operational reliability of the pipeline system. In this study, a single-pipe system with multi-hoop supports was chosen as the research object, and a method based on the particle swarm algorithm was developed to optimize the layout of the hoops for effectively avoiding vibration of the pipeline system. A finite element model (FEM) of the pipeline system was created and the group of spring elements with non-uniform distribution of stiffness values was used to simulate the hoop support for improving the analysis accuracy of the model in the modeling process. Taking the hoop position as design variable, an optimization model of the pipe hoop layout was established, which aims at avoiding one or two excitation frequencies at the same time. Furthermore, the calculation procedure of optimizing pipe hoop layout using the particle swarm algorithm was given. Finally, a case study was carried out, the rationality of the created FEM was validated by experiments, and the optimal layout of hoops was obtained using the proposed optimization method.

The Application Study of Accumulator Used in Hydraulic System of 20MN Fast Forging Machine

2011 ◽  
Vol 80-81 ◽  
pp. 870-874 ◽  
Author(s):  
Min Qiang Dai ◽  
Sheng Dun Zhao ◽  
Xiao Mei Yuan
Keyword(s):  
Energy Conservation ◽  
Hydraulic System ◽  
Pressure Pulsation ◽  
Test System ◽  
Hydraulic Shock ◽  
Application Study ◽  
Calculation Results ◽  
Set Up ◽  
Forging Press ◽  
Made In

Based on the description of 20MN fast forging press hydraulic system, the paper analyzed the possibility of energy conservation which the accumulator made in the fast forging machine system. When accumulator was used in fast forging machine, then analyzed the calculation results, and the energy conservation program of fast forging machine energy accumulator was evaluated briefly. The test system was set up on 20MN fast forging machine, and the paper researched the application of accumulator in fast forging press hydraulic system on absorbing hydraulic shock and eliminating pressure pulsation.

An Optimisation Approach Applied to Design the Hydraulic Power Supply for a Forklift Truck

2004 ◽  
Author(s):  
Henrik C. Pedersen ◽  
Torben O. Andersen ◽  
Michael R. Hansen ◽  
Per N. Lindholdt
Keyword(s):  
Power Supply ◽  
Energy Efficient ◽  
Hydraulic System ◽  
Open Circuit ◽  
Current Paper ◽  
Hydraulic Power ◽  
Design Specifications ◽  
Forklift Truck ◽  
Multi Level ◽  
Operational Aspects

This paper describes the first part of a method that may be used in the design of the most energy efficient hydraulic open-circuit systems, when also considering the operational aspects of the system given in the design specifications. The method builds on a numerically based multi-level optimisation approach, and is in the current paper exemplified through the design of the hydraulic power supply for a forklift truck. The paper first describes the prerequisites for the method and then explains the different steps in the approach to design the hydraulic system. Finally the results of the optimisation example for the forklift truck are presented along with a discussion of the method.

Pipeline Vibration Analysis and Control for the First Booster of Ethylene

2013 ◽  
Vol 313-314 ◽  
pp. 777-784 ◽  
Author(s):  
Wei Yi Zhang ◽  
Yong Ming An ◽  
Shu Feng Wang ◽  
Hang Wu ◽  
Jun Yong Lei
Keyword(s):  
Frequency Response ◽  
Natural Frequency ◽  
Pressure Pulsation ◽  
Exhaust Valve ◽  
Pipeline System ◽  
Exhaust Pipe ◽  
Pulsation Frequency ◽  
Suction Pipe ◽  
The Law ◽  
Pipeline Vibration

For existing local severe vibration problems on the pipeline system of conveying ethylene booster in ethylene cracking system of a petrochemical company, the detailed analysis by CAESARII was carried out to its pipeline system natural frequency and vibration modal; The flow of ethylene gas within the booster pipeline from the suction pipe to exhaust pipe inside including the buffer tank was analyzed using fluid analysis software--FLUENT, the pressure field and velocity field of the flow was obtained. According to the law of the suction and exhaust valve open-closed mouth, dynamic boundary conditions was set on the suction valve and exhaust valve. The ethylene flow non-steady-state analysis calculations was carried out within the pipeline from the suction tube inlet to suction valve and from the exhaust valve to the exhaust tube outlet , the law of the pressure pulsation frequency response was obtained on the suction pipe inlet and the exhaust pipe outlet. The results show that ethylene gas pipeline pressure pulsation frequency response was basically equal to the frequency of the suction and exhaust valve open-closed mouth; The actual pipe vibration modals of the pipeline system on the scene and the pipeline vibration modals a few corresponding to the natural frequencies of the pipeline system close to the pulsation frequency in flow pressure are very similar, indicating that the vibration of the pipeline system is due to the pressure pulse frequency of the ethylene gas internal pipeline close to the natural frequency of the local pipeline, caused due to local resonance. Changing the form of hangers in vibration system can change the natural frequency of pipeline to avoid resonance. Tube fluid dynamic pressure caused by the stress of the pipeline is limited and will not cause damage to the tube material. Mass flow rate does not match with the tube diameter will cause too large flow velocity, the inertia force caused by the larger on the suction valve and exhaust valve before and after, resulting in the forced vibration of the compressor body.

Dynamic Reliability Evaluation of Pressure Pulsation for Hydraulic Power Pipelines

2010 ◽  
Vol 139-141 ◽  
pp. 2436-2439
Author(s):  
Wei Liu ◽  
Hang Shan Gao ◽  
Zhu Feng Yue
Keyword(s):  
Failure Criterion ◽  
Design Method ◽  
Dynamic Pressure ◽  
Pressure Pulsations ◽  
Hydraulic Power ◽  
Dynamic Reliability ◽  
Output Pressure ◽  
Fatigue Damage Accumulation ◽  
First Passage Failure ◽  
Execution Unit

The pressure pulsations inner the hydraulic power pipelines not only deteriorate the precision of execution unit, but also bring on vibration, noise or other troubles in hydraulic device. In this paper, the output pressure pulsations were treaded as a stationary random process approximately. The mean square deviation of dynamic stress under the pumping source white noise exciting was calculated based on frequency responses. The first-passage failure criterion and fatigue damage accumulation failure criterion were adopted to analyze the dynamic pressure reliability respectively, and the relation of amplitude pulsations and the pipelines reliability was obtained. The results indicated that the preventative design method of below10% of rated pressure did not meet the security specification of the hydraulic power unit.

Analysis of Construction Machinery Hydraulic Control System

2013 ◽  
Vol 401-403 ◽  
pp. 1590-1595 ◽  
Author(s):  
Li Zhang
Keyword(s):  
Power Control ◽  
Hydraulic System ◽  
Control Mode ◽  
Hydraulic Control ◽  
Hydraulic Power ◽  
Construction Machinery ◽  
Advantages And Disadvantages ◽  
Power And Control ◽  
And Control ◽  
Hydraulic Control System

This article analyses the use requirement of construction machinery, introduce the main features of typical construction machinery hydraulic system, derived power control modes of hydraulic system form hydraulic power form, compares the advantages and disadvantages of each power control mode, gives the optimization solutions, at last, sum up the full text of the construction machinery hydraulic power and control modes and prospect of the hydraulic system to precision control.

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