Research on Influence Factors of Landing Gear Retractile Hydraulic System Performance Degradation

2014 ◽  
Vol 599-601 ◽  
pp. 409-412 ◽  
Author(s):  
Wu Feng Zhu ◽  
Zhong Yan ◽  
Qing Wei Xin
Keyword(s):  
Simulation Model ◽  
System Performance ◽  
Hydraulic System ◽  
Influence Factors ◽  
Initial Pressure ◽  
Performance Degradation ◽  
Landing Gear ◽  
Orifice Diameter ◽  
Aircraft Maintenance ◽  
Simulation Results

Simulation model of landing gear hydraulic system is built based on AMESim, several key influence factors of performance degradation of landing gear hydraulic system are analyzed, such as changes of restrictor orifice diameter, initial pressure of accumulator, viscosity and gas percentage of oil , etc. The simulation results bring valuable reference to aircraft maintenance.

Short-Circuit Model and Simulation Characteristics of Synchronous Generators

2012 ◽  
Vol 241-244 ◽  
pp. 709-716
Author(s):  
Wan Qing Song ◽  
Qi Zhong Liu ◽  
Xu Dong Teng ◽  
Chao Gang Yu
Keyword(s):  
Theoretical Analysis ◽  
Simulation Model ◽  
Short Circuit ◽  
Influence Factors ◽  
Synchronous Generator ◽  
Synchronous Generators ◽  
Model And Simulation ◽  
Simulation Results ◽  
Physical Quantities ◽  
Tremendous Impact

In this paper, the electrical transient mode of synchronous generators is studied, four different simulation model of synchronous generator on sudden short circuit was built, various physical quantities were studied by simulation during the short circuit. By comparing theoretics with simulation, various physical quantities of synchronous generator produced tremendous impact and surge during the sudden circuit and they stabilized in the proceeding state of short circuit. Thoroughly simulation analyzed, the results of simulation are identical with theoretical analysis. The simulation results show that these influence factors should be considered when we design the relay protections.

scholarly journals Sensorless Control of a Fault Tolerant PMSM Drives in Case of Single-Phase Open Circuit Fault

2016 ◽  
Vol 7 (4) ◽  
pp. 1061
Author(s):  
Kamel Saleh ◽  
Mark Sumner
Keyword(s):  
Control Strategy ◽  
System Performance ◽  
Single Phase ◽  
Fault Tolerant ◽  
Sensorless Control ◽  
Fault Tolerant Control ◽  
Performance Degradation ◽  
Open Circuit ◽  
Phase Inverter ◽  
Simulation Results

This paper introduces a sensorless-speed-controlled PMSM motor fed by a four-leg inverter in case of a single phase open circuit fault regardless in which phase is the fault. To minimize the system performance degradation due to a single phase open circuit fault, a fault tolerant control strategy that includes taking appropriate actions to control the two remaining healthy currents is used in addition to use the fourth leg of the inverter.  Tracking the saliency is done through measuring the dynamic current responses of the healthy phases of the PMSM motor due the IGBT switching actions using the fundamental PWM method without introducing any modification to the operation of the fourth leg of the inverter. Simulation results are provided to verify the effectiveness of the proposed strategy for sensorless controlling of a PMSM motor driven by a fault-tolerant four-phase inverter over a wide speed ranges under the case of a single phase open circuit.

Simulation Research on Hydraulic Support Column System Based on AMESim

2012 ◽  
Vol 229-231 ◽  
pp. 1684-1687
Author(s):  
Jun Zhu ◽  
Feng Yuan ◽  
Hong Xia Wu
Keyword(s):  
Simulation Model ◽  
Working Conditions ◽  
Hydraulic System ◽  
Hydraulic Support ◽  
Simulation Research ◽  
Column System ◽  
Actual Working ◽  
Working Principle ◽  
Simulation Results ◽  
Working Procedure

The working principle and process of the hydraulic support column system is introduced at first. The simulation model of the column system is established in the software of AMESim, and the parameters of the model are set according to the actual working conditions. The simulation curves of each working procedure are obtained, and the simulation results are analyzed. The conclusions will be essential references for the research on the entire support hydraulic system.

Dynamic Co-Simulation of Fracture Splitting Machine for Connecting Rods

2010 ◽  
Vol 20-23 ◽  
pp. 294-298
Author(s):  
Li Ming Zheng ◽  
Shen Hua Yang ◽  
Wen Ming Jin
Keyword(s):  
Hydraulic System ◽  
Manufacturing Industry ◽  
Influence Factors ◽  
Processing Technique ◽  
Connecting Rod ◽  
Working Pressure ◽  
Automobile Engine ◽  
Fracture Splitting ◽  
Simulation Results ◽  
New Processing

The fracture splitting (FS) method is a bran-new processing technique in the automobile engine connecting rod manufacturing industry, FS is one of three pivotal working procedures, and press speed is one of the key influence factors of FS process. In order to realize parameters of press speed and pull cylinder working pressure, dynamic simulation of hydraulic system has been carried out. Simulation results indicated that press speed of pull cylinder was about 130mm/s, which was between 120mm/s and 150mm/s that was not only good for controlling FS quality, but also not leading irrational design of hydraulic system. The working pressure of pull cylinder was between 10MPa and 14MPa, which was suitable for FS processing. The hydraulic system of FS machine can satisfy the basic requirements of connecting rods FS process. This paper has provided reliable theoretic basis for the design of FS machine for connecting rods.

Simulation and Test of ASAC Dynamic Characteristic Based on ABAQUS

2013 ◽  
Vol 765-767 ◽  
pp. 331-335 ◽  
Author(s):  
Li Qin Sun ◽  
Zhong Xing Li ◽  
Xu Feng Shen ◽  
Ji Wei Guo
Keyword(s):  
Finite Element ◽  
Geometric Nonlinearity ◽  
Influence Factors ◽  
Initial Pressure ◽  
Element Model ◽  
Nonlinear Characteristic ◽  
Static Stiffness ◽  
Air Spring ◽  
Good Consistency ◽  
Simulation Results

Considering the influence factors of material nonlinearity ,geometric nonlinearity and etc.of air spring with auxiliary chamber in numerical calculations, implement method of airbag nonlinear characteristic ,gas unit, connecting pipe were defined. Finite element model was established in ABAQUS,and vertical characteristic simulation was carried out ,and the results shows that, system static stiffness reduces when increasing in the volume of the auxiliary chamber, but the change in stiffness is not is obvious when the volume increases to a certain degree, and static stiffness also reduces when initial pressure reducing. Simulation results are verified through characteristic test,and both are in good consistency.

Design and Simulation for the Hydraulic System of a New-Style Monorail Crane Traction System

2013 ◽  
Vol 321-324 ◽  
pp. 94-97
Author(s):  
Jun Zhang ◽  
Qing Yang Cai ◽  
Xian Weng Zhao ◽  
Chun Ren Tang ◽  
Meng Meng Niu ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
System Performance ◽  
Hydraulic System ◽  
Design Scheme ◽  
Underground Cable ◽  
Simulation Results ◽  
Traction System

In order to meet the requirement of the underground cable checked, the hydraulic system of a new-style monorail crane traction system is introduced. The hydraulic system of the traction system was designed. The modeling and simulation for the hydraulic system was build, and the simulation results were analyzed subsequently. The research shows the system performance reaches the requirements. The simulation results are almost the same as the theoretical value, and the design scheme of the hydraulic system is feasible.

Research on Cushion Characteristics of Self-Inflating Buffering Airbag

2014 ◽  
Vol 496-500 ◽  
pp. 1134-1138
Author(s):  
Huang Jie Hong ◽  
Hong Yan Wang ◽  
Zhe Yuan Lv ◽  
Jian Yang Li
Keyword(s):  
Simulation Model ◽  
Experimental Method ◽  
Influence Factors ◽  
Experimental Results ◽  
Initial State ◽  
Landing Impact ◽  
Impact Attenuation ◽  
Simulation Results

The buffering airbag is one of the most important technologies for the landing impact attenuation of dropped equipments. A designed simplified airbag had been used to study cushion characteristics of self-inflating buffering airbag based on experimental method. Every possible combination of factors and factor levels was considered in the experiment. The influence factors of cushion characteristics were researched through the results. The results show that acceleration and pressure inside the airbag are affected by the initial landing velocity, mass of the load and the initial state of vent orifices. Then the simulation model of airbag was established and validated by experimental results. The simulation results agree very well with the experimental results. The established model can be used for further research of cushion characteristics.

Analysis on the Shifting Performance of the Hydraulic System of a Transmission for Construction Machinery

2011 ◽  
Vol 201-203 ◽  
pp. 2206-2211
Author(s):  
Yan Min Li ◽  
Zhi Hua Liu ◽  
Dong Wang ◽  
Yong Zhang
Keyword(s):  
Simulation Model ◽  
Hydraulic System ◽  
Response Speed ◽  
Hydraulic Cylinder ◽  
Fast Response ◽  
Double Step ◽  
Construction Machinery ◽  
The Future ◽  
Simulation Results ◽  
Cartridge Valves

The paper discusses the performance of a hydraulic system controlling the shifting action of a construction vehicle transmission. Based on the principle of the hydraulic system of the transmission, a simulation model of the hydraulic system is established using AMEsim software. The simulation results indicate that the double-step hydraulic cylinder structure has an advantage of a fast, smooth and reliable shifting. The shifting connecting and separating overlap time of two clutches can be controlled precisely by an electronic joystick. The fast response speed can be ensured because using screw-in cartridge valves acting as the directional valves. Some techniques of improving the shifting quality are obtained. There is a great reference for the construction vehicles’ transmission in the future.

Design and Analysis of Hydro-Viscous Winch Hydraulic System

2012 ◽  
Vol 605-607 ◽  
pp. 1317-1321
Author(s):  
Qing Rui Meng ◽  
Shang Fei Lin ◽  
Jian Wang
Keyword(s):  
Optimal Design ◽  
Simulation Model ◽  
Flow Rate ◽  
Theoretical Basis ◽  
Hydraulic System ◽  
Lubricating Oil ◽  
Orifice Diameter ◽  
Disc Brake ◽  
System Pressure ◽  
Oil Flow

A hydro-viscous winch comprises a disc brake and a hydro-viscous brake. The hydraulic system is of utmost importance to the performance of the winch. To verify the validity of the hydraulic system, by using AMESim software, the simulation model of the hydraulic system was built and the performance analyzed. The results show that 1) the pressure and the flow rate of the disc brake hydraulic system are mainly affected by the energy accumulator; 2) Hydro-viscous brake hydraulic system pressure and lubricating oil flow rate are influenced by orifice diameter of the throttle valve; 3) during the braking period, the amplitude of the deceleration is rather small and the hydro-viscous winch hydraulic system can meet the requirements well. Research achievements of this work provides theoretical basis for optimal design of the hydro-viscous winch hydraulic system.

scholarly journals Research on Modeling and Simulation of Electro Backup Hydraulic Actuation System

2020 ◽  
Vol 179 ◽  
pp. 01014
Author(s):  
Pei Lei ◽  
Hongjun Pang ◽  
Sa Liu
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
System Performance ◽  
Test Results ◽  
Sweep Frequency ◽  
Actuation System ◽  
Working Principle ◽  
Simulation Results ◽  
System Characteristics ◽  
Application Prospects

As one form in power-by-wire actuation system, the Electro backup hydraulic actuation system (EBHAs) has broad application prospects in the aviation field. In this paper, a numerical simulation model of the system performance for EBHAs is established. Based on the detailed description of its working principle, the mathematical models of EBHAs and its subsystems, as well as numerical model in the Matlab / Simulink environment are established, and a larger number of numerical simulations are carried out, which contain the normal working mode and the backup working mode. Furthermore, numerical simulation results are compared and analyzed with those results of experimental, which further verified the system simulation model established in this paper. It can be concluded from the results that the dynamic response of the system can meet the requirements of the design, no matter the normal or backup working modes. And the simulation results of the system sweep frequency are basically consistent with the test results, and the error is less than 10%. It is clear that the simulation model presented in this paper can accurately describe the system characteristics of EBHAs, which is useful to the design of EBHAs system.

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