scholarly journals Fly-by-Wire Actuation System Modeling and Force Fight Equalization Research

2020 ◽  
Vol 38 (3) ◽  
pp. 643-648
Author(s):  
Liang Tian ◽  
Yanshan Zhang ◽  
Haiwei Wang
Keyword(s):  
Simulation Analysis ◽  
System Modeling ◽  
Pi Control ◽  
Equivalent Transformation ◽  
Control Law ◽  
Dynamic Force ◽  
Operational Mode ◽  
Integration Algorithm ◽  
Actuation System ◽  
Control Modeling

Aiming at the actuation system force fight problem resulted from active-active operational mode of fly-by-wire aircraft, and considering the technical maturity and reliability from safety aspect, the inertial integration algorithm and PI control law are established. After tradeoff study on these two methods, the PI control law is selected lastly.By physical model equivalent transformation, mechanical kinetics analysis, position closed-loop servo control modeling and AMEsim modeling and simulation analysis of the actuation system, the results show that using PI control can make the static force fight almost decrease to zero, make the dynamic force fight decrease to 1.288 9×106 Pa, 62.58% lower than requirement.It demonstrates the feasibility of the designed PI control law, and can be taken as the theoretic evidence of the forthcoming force fight equalization test on test rig.

Missile Roll Autopilot Redesign Based Advanced Fin Actuation System Modeling

2020 ◽  
Author(s):  
Sameh Fathey Shelan ◽  
Mohammed Abozied Hassan ◽  
Hossam Hendy ◽  
Yehia Zakarya Elhalwagy
Keyword(s):  
System Modeling ◽  
Actuation System

Multibody Dynamic Model of Web Guiding System With Moving Web

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Lei Yu ◽  
Zhihua Zhao ◽  
Gexue Ren
Keyword(s):  
Dynamic Model ◽  
Lateral Displacement ◽  
Dynamical Behavior ◽  
Contact Forces ◽  
Lagrangian Formulation ◽  
Pi Control ◽  
Control Law ◽  
Reference Surface ◽  
Multibody Dynamic ◽  
Guiding System

In this paper, a multibody dynamic model is established to simulate the dynamics and control of moving web with its guiding system, where the term moving web is used to describe thin materials, which are manufactured and processed in a continuous, flexible strip form. In contrast with available researches based on Eulerian description and beam assumption, webs are described by Lagrangian formulation with the absolute nodal coordinate formulation (ANCF) plate element, which is based on Kirchhoff’s assumptions that material normals to the original reference surface remain straight and normal to the deformed reference surface, and the nonlinear elasticity theory that accounts for large displacement, large rotation, and large deformation. The rollers and guiding mechanism are modeled as rigid bodies. The distributed frictional contact forces between rollers and web are considered by Hertz contact model and are evaluated by Gauss quadrature. The proportional integral (PI) control law for web guiding is also embedded in the multibody model. A series of simulations on a typical web-guide system is carried out using the multibody dynamics approach for web guiding system presented in this study. System dynamical information, for example, lateral displacement, stress distribution, and driving moment for web guiding, are obtained from simulations. Parameter sensitivity analysis illustrates the effect of influence variables and effectiveness of the PI control law for lateral movement control of web that are verified under different gains. The present Lagrangian formulation of web element, i.e., ANCF element, is not only capable of describing the large movement and deformation but also easily adapted to capture the distributed contact forces between web and rollers. The dynamical behavior of the moving web can be accurately described by a small number of ANCF thin plate elements. Simulations carried out in this paper show that the present approach is an effective method to assess the design of web guiding system with easily available desktop computers.

Multirate Integration for Real-Time Simulation of Wheel Loader Hydraulics

1999 ◽  
Author(s):  
Laurenţiu I. Buzdugan ◽  
Ole Balling ◽  
Peter Chien-Te Lee ◽  
Claus Balling ◽  
Jeffrey S. Freeman ◽  
...  
Keyword(s):  
Real Time ◽  
System Modeling ◽  
Pressure Fluctuations ◽  
Integration Scheme ◽  
Step Size ◽  
Integration Algorithm ◽  
Wheel Loader ◽  
Real Time Simulation ◽  
Time Simulation ◽  
Dynamics Models

Abstract This paper details a real-time simulation of an articulating wheel loader, which is comprised of a multibody system modeling the chassis and the bucket assembly and a set of subsystems. The hydraulic subsystem is modeled by a set of ODE’s which represent the oil pressure fluctuations in the system. An Adams-Bashforth-Moulton integration algorithm has been implemented using the Nordsieck form to develop a constant step-size multirate integration scheme, modeling the interaction between the hydraulic subsystem and multibody dynamics models. An example illustrating the simulation of a wheel loader bucket operation is presented at the end of the paper.

The Distribution Design and Dynamic Simulation Analysis of the Flow of the Transmission’s Cooling and Lubrication System

2014 ◽  
Vol 633-634 ◽  
pp. 1303-1310
Author(s):  
Jing Ke Du ◽  
Shu Han Wang ◽  
Ting Bin Song ◽  
Teng Teng Kang
Keyword(s):  
Simulation Model ◽  
Simulation Analysis ◽  
System Modeling ◽  
Flow Distribution ◽  
Lubrication System ◽  
System Flow ◽  
Set Up ◽  
Cooling And Lubrication ◽  
Test Result ◽  
New System

The bearing lubrication system flow distribution design of the transmission was realized with a new system modeling method, targeted at the problem of a certain type of transmission’s bearings’ sintering. The heat-generated model and the flow-required model of the bearings and the gears were set up, and the required lubrication flow was obtained. The simulation model of the system flow distribution was established, the simulation analysis toward the dynamic characteristic of the transmission’s lubrication flow’s distribution was performed, and the results of the simulation analysis and the test were analyzed comparatively. The result showed that the simulation model matched the test result well, proving the effectiveness and correctness of the model of the transmission’s flow distribution.

Control system design of a small jet engine with a swiched PI control law

2019 ◽  
Vol 2019.56 (0) ◽  
pp. K021
Author(s):  
Kento NAITO ◽  
Kazuhiko HIRAMOTO ◽  
Takanori SUGIYAMA ◽  
Hiroyuki KOSHIKIZAWA
Keyword(s):  
Control System ◽  
System Design ◽  
Pi Control ◽  
Control System Design ◽  
Control Law ◽  
Jet Engine

An Electrohydraulic Pressure Compensation Control System for an Automotive Vane Pump Application

2020 ◽  
Author(s):  
Ryan Paul Jenkins ◽  
Monika Ivantysynova
Keyword(s):  
Control System ◽  
Feedback Linearization ◽  
Automatic Transmission ◽  
Pi Control ◽  
Control Law ◽  
Nonlinear Feedback ◽  
Nonlinear Controller ◽  
Vane Pump ◽  
Compensation Control ◽  
Pressure Compensation

Pressure compensated vane pumps are an excellent solution for supplying hydraulic power with minimal waste in many automotive applications. An electrohydraulic pressure compensation control system for an automatic transmission supply that promises improved pressure response times over the baseline architecture is discussed. Suggested valve specifications are determined through calculations based on available data and refined via a validated simulation model of the proposed system. Two controller designs are formulated and compared: a basic PI control law and a cascaded model following controller including a nonlinear feedback linearization component. Simulations of the proposed system for a given duty cycle reveal that the nonlinear controller provides only minor improvements over a basic PI control law and is thus not an economical solution.

The Research on Height Control of Airship with Constant Flying Speed

2014 ◽  
Vol 644-650 ◽  
pp. 875-878
Author(s):  
Xin Li Zhang ◽  
Yun An Hu ◽  
Di Liu
Keyword(s):  
Nonlinear Model ◽  
Flight Control ◽  
Pid Control ◽  
Simulation Analysis ◽  
Reference Value ◽  
Control Law ◽  
High Increase ◽  
Height Control ◽  
Control Scheme ◽  
Detailed Simulation

The PID control scheme of airship with fixed flying high is studied in allusion to pitch channel nonlinear model of a class of stratosphere airship in this paper. The traditional PID control law is designed aim at the fixed high flight control of airship. The detailed simulation analysis is presented. It indicates that the airship can realize the fixed high flight in the range of 1000 meters. When flying high increase further, PID control scheme is not reasonable because instruction is too large. At the same time, the speed of engine has large influence on PID control scheme. The research of paper has good technical reference value for design and experiments of stratosphere airship.

Supersonic Missile Control with PI Sliding Mode Method

2011 ◽  
Vol 295-297 ◽  
pp. 1773-1776
Author(s):  
Qiang Ma ◽  
Yu Qiang Jin
Keyword(s):  
Sliding Mode ◽  
Adaptive Methods ◽  
Pi Control ◽  
Control Law ◽  
Sliding Mode Controller ◽  
Sliding Surface ◽  
Mode Method

Comparing with traditional adaptive methods, a very simple PI sliding mode controller is designed for uncertain nonlinear missile systems with the help of two main assumptions which are also testified to be reasonable.The construction of PI control for sliding surface is novel and effective. Also, the proof of PI type control law is unique in this paper.

scholarly journals Bleed Air Temperature Regulation System: Modeling, Control, and Simulation

2021 ◽  
Author(s):  
Peter Hodal
Keyword(s):  
Heat Exchanger ◽  
Temperature Control ◽  
Control Strategy ◽  
Temperature Regulation ◽  
Control Method ◽  
System Modeling ◽  
Regulation System ◽  
Pi Control ◽  
Air System ◽  
Control Configuration

This thesis addresses temperature control of an engine bleed air system, as used on typical aircraft, with a control strategy aimed at reducing ram air usage while maintaining fast response. The analytical equations describing the system dynamics are presented, and a state space model of a cross-flow heat exchanger is developed. The heat exchanger model is then utilized in the modeling of the bleed air system under study. Different control strategies and configurations are analyzed and compared. In order to achieve fast temperature regulation while saving ram air usage, a ram-air-plus-bypass control configuration is proposed, along with the control of both load temperature and bypass valve opening. Classical PI control is employed, and a hybrid LQ/PI control method is additionally investigated for the proposed control configuration. Simulations for each control strategy are performed using a nonlinear dynamic model at several sample mission operating points, with consideration of disturbances in engine loading of ambient conditions. Comparisons are made and conclusions are drawn based on these simulations. The proposed configuration and control strategy prove to be more effective in terms of satisfying both low ram air usage and fast temperature control response.

scholarly journals Research and Analysis of Automated Special Machine for Fastening of U-Frame and Screw

2019 ◽  
Vol 8 (12S) ◽  
pp. 192-195
Keyword(s):  
Material Handling ◽  
Simulation Analysis ◽  
System Modeling ◽  
Circuit Breaker ◽  
Serial Transfer ◽  
Special Machine ◽  
Actuator System ◽  
Increase Productivity ◽  
Automated Material Handling ◽  
And Control

This paper introduces the Design, Modeling and Simulation of a special tool that attaches a screw to attach the screw to a bimetal of MCB (Miniature Circuit Breaker). Problems found in the current process include complex shape and screw size and full connection operation is an intensive manual operation which makes handling difficult for the operator and also the size of the M2 screw and is headless with a cross section. In partnership with the SPM operator works as a tool to increase productivity by reducing operator fat. The system is a testament to automated material handling system, serial transfer, trap detection, attachment, automatic ejecting system, actuator system, sensors and control capabilities etc. Small screw handling and bike prospect are the major challenges in the special development of a purpose screw attachment system. System Modeling & Simulation analysis is done and the results are encouraging.

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