Template presentation WEBEX 2010_SMD_Hydraulic_Nov2011_revGBA.pdf

7/29/2019 Template presentation WEBEX 2010_SMD_Hydraulic_Nov2011_revGBA.pdf

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1 copyright LMS International 2010

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Improved Hydraulics Systems simulation for

Aerospace Industry with LMS Imagine.LabAMESim

Presenter:Stphane Mouvand Aerospace Competence Center of LMS

Duration 45min

LMS live Web Seminar 29/12/2011


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Agenda

2

3

Applications Examples4

1

5

References

Industry Challenges

Solution Presentation

Conclusion


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Agenda

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3


1

5


Industry Challenges

References

Conclusion


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LMS Imagine.Lab is providing proven and ever innovatives answers

Multi-domain analysisTransient and static efficiency

Sharing knowledgeCover the whole design cycle

Integrated Aircraft Integrated SystemsIntegrated market Integrated process

Innovation is key of success

Earlier with lower risktechnical choices

Greener and more reliable More comfortable

Do not forget the past profit from it

allows for a better future

Technological trade-offNeed for System Engineering

Wide range for load cases

Global energy analysis andmanagement

From jet engine down tosubsystem and systems

Reuse knowledge and modelsShare knowledge and expertise

in the companyIdentify improvement sources

THE SOLUTION

LMS Imagine.Lab


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Agenda

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3


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Industry Context & Applications

References

Conclusion


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LMS, references

HelicopterAirplane

System supplier

Propulsion

EquipmentSpace


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Agenda

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References

Conclusion


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There are 3 AMESim libraries to simulate hydraulic componentsand systems :

Each library has an application

Hydraulic libraries are fully compatible, also with Signal (SI) andMechanical (MEC)

Hydraulic brief overview

8 copyright LMS International - 2008

Hydraulic Resistance library (HR)

Hydraulic library (HYD)

Hydraulic Component Design library

HR

HYD

HCD


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There are 3 AMESim libraries to simulate thermo hydrauliccomponents and systems :

Each library has an application

These libraries are fully compatible, also with Thermal library (TH),Signal (SI) and Mechanical (MEC)

Thermal brief overview


Thermal Hydraulic Resistance library

Thermal Hydraulic library

Thermal Hydraulic Component Design library

THR

THH

THCD


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Type of fluid properties

SimplestVery simple model and assumptions.

Constant viscosity, Bulk (1>Psat and 2


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Type of fluid properties

Advanced using tablesThis uses an ASCII file to define fluid properties(density, bulk, viscosity) as a function of pressure and

temperature. The air/gas release and the cavitationmodel are identical to the one used in the Advancedmodel.


Robert Bosch adiabatic diesel

This model was developed in collaboration withRobert Bosch and was validated with measurements.

Elementary or Advanced withcalculated viscositykinematic viscosity is calculated and is a function ofthe fluid temperature.


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Some physical phenomena can affect these fluids properties :

-Aeration effect

-Cavitation phenomenon

The aeration refers to all types of gas which can be entrapped by the fluid

The cavitation is the vaporization of the fluid under low pressure

Aeration / Cavitation


Parameters setting

Aeration phenomenon :

- air/gas content

- saturation pressure

Cavitation phenomenon :

- high vapour pressure

- low vapour pressure


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Fluid properties summary


Ensures mass conservation

Different fluid properties

levels in AMESim

Aeration and Cavitation affectthese properties


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Hydraulic Library Elements of library


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Pumps and Motors


Pumps and motors are transformers elements : a conversion is madefrom mechanical energy to hydraulic energy or vice versa

Several kind of pumps/motors are available :

- Unidirectional or bidirectional

- Fixed or variable displacement

In the case of variable displacement pumps/motors, a signal port is used to represent the fractionswash of the pump

- With or without efficiency

- Flow ripple model (dynamics)

-

PQwM tt = ..- Qt theoretical flow rate [m3/s]

- P delta pressure [Pa]

- Mt theoretical torque [N.m]

- w rotary speed [rev/s]


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Jacks


Jacks are also transformers elements : a conversion is made betweenmechanical energy and hydraulic energy

Several kind of jacks are available :

- With or without spring assistance

- With or without masses

- Leakages can be considered

- Elastic ends stops with stiffness and damping contact are considered

SPF .=- S jack area [m2]

- P pressure [Pa]- F mechanical force [N]


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Flow Control Valves


Control valves : Many control valves exist in the hydraulic libraries.These vary depending on the number of position (2 or 3) and thenumber of ports (from 2 to 6)

The flow characteristic of a valve way (or flow path) is defined by aQ/P pair at maximum opening.

The flow paths are defined as function of the valve displacement. For

each way, the area is defined by S(x) = Smax * f(x)


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Pressure valves


Check valves : these components allows the fluid to flow in only onedirection when the pressure is higher than a defined cracking pressure

Relief valves : these components are used to limit the pressure in afluid system

Pressure regulators or reducers : these components are used to controlthe pressure in a fluid system


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Line models in Imagine.Lab AMESim


(FDF)

1D models (internal solver for continuity, motion and f.d.f

equations)

(FDF)

(FDF)

R

R

R R R R R R R R R R

0D models (1 element)

qni pni pni-1qni-1qnN pnN

L/(2N+1)2V/(2N+1)

2L/(2N+1) 2L/(2N+1)2V/(2N+1)2V/(2N+1)

2L/(2N+1)V/(2N+1)

R R R R

series of 0D models (N elements)


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Friction in hydraulic lines


Model 1 - Frictionless model

Model 2 - Friction with steady flow model

Model 3 - Friction with non steady flow model

Model 1: undamped model

Model 2: all frequencies are damped at the same level(steady state friction Moody chart)

Model 3: highest frequencies are more damped thanlowest frequencies (Frequency Dependent Friction)

= L/c

Bode plot: Amplitude Q2/Q1


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Hydraulic Resistance Library HR

Pipe Pressure drop

elements

Centrifugalelements

Centrifugal Pump

Volumetric Pump

Annular pipe

Grooved bushing

Static Pressure

sensor

Elements of the library



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Reminder Orifices in AMESim


In HYD library, the flow rate is computed using themaximum flow coefficient Cq and the critical flow

number.

PACQ restq

=

22

2

2restA

QP =

PDh

=

2

HYD library HR library

Bernoulli equation Darcy-Weisbachequation

Flow number Reynolds numberAQDR he =

Flow coefficientFrictionfactor

Cqmax

Cq

crit

TurbulentLaminar

min

Recrit Re

Laminar

Turbulent

In HR library, the pressure drop is computed using thefriction factor and the critical Reynolds number.


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Hydraulic Resistance Library HR

Main features of the HR library

Full compatibility with the HYD library

HR Library is mainly used for networks with:

Low pressures (0 10 bar)

High speeds (> 3-4 m/s)

5 m/s = 0.11 bar Dynamic Pressure

Pressure drops across various restriction geometries result fromexperimental studies conducted by I.E. Idelchik*

*Handbook of Hydraulic Resistance 3rd edition I.E. Idelchik (Begell House)



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Check valve Example

n Technological elements

n Functional level

if(ic[0] == 0)

{ /* Valve is moving freely */

logi = ( ((*xv) < -xvhys) || ((*xv) > 1.0 + xvhys) );

/* Check for saturation */

area = (*xv)*amax;*qout = orif3_(pin, pout, &area, &hdiam, &cqmax, &lamc);}

n Equation level

n Block Diagram

Fluid Systems and Components: Modeling Alternatives

FEATURES Long time experience in Fluids capitalized

in robust libraries From functional to detailed level of

modeling Easy coupling between libraries and

physical phenomena

BENEFITS

Solutions accessible whatever the skills(from non-expert to expert users)

Modeling of your Fluids systems from thecomponent to its global architecture

All your Fluids systems and other relatedsystems coupled in a single platform


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The unique Fluids Component Design libraries concept: a limited number ofcomponent models allows to build a huge variety of systems

Design of fluid component with LMS Imagine.Lab AMESim

FEATURES

Graphic modeling language Validated components

Interaction of mechanical and hydraulic domain considered

Similar for thermal-hydraulic and pneumatic


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The basic element philosophy


check valvepiston type 1 piston type 2


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The basic element philosophy


Technical drawing HYD library for systemmodeling

HCD library forcomponent design


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System and component level

Moog Servo valve model in AMESim

Active area+ spring

Compressibility

Line (dynamics)

Inertia

Friction

Real geometryJet force


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The supercomponent facility

The supercomponent can now be used as a 'regular' AMESim component


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Multi-Level/Multi-Disciplines Conceptual Phase

VerificationFinalPreliminaryConceptual

Need for multi-disciplines increases

Electrohydrostatic Actuator

Simple low-order systems-level approximation

algebraic equations empirical data (tabular data) used to approximate performance S-function approach (LaPlace domain) to model dynamic response


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Multi-Level/Multi-Disciplines Preliminary Phase


Component-level design requires fewer disciplines


Electric

Motor

Hydraulics



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Multi-Level/Multi-Disciplines Final Phase


Jack Model

Multi-disciplines required for complete virtual prototyping:

Controls

Electric MotorsHydraulics

2-D Mechanics

Electromagnetics

Mechanical



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Multi-Level/Multi-Disciplines Verification Phase (HIL)


Real-Time

Real TimeSystem


dSpace, xPC target, Labview RT, Opal-RT, ADI,

ETAS are the different realtime targets supported


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AMESim : Simulink Interface

Plant models are built in AMESim due to the collection of physical libraries and its fidelity

AMESim model can be exported into Simulink as a s-function and solved using Co-Simulation (each software uses its own solver)

S-function (purely Simulink solver)

Simulink model can be exported into AMESim (through RTW)

AMESim


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Multi-Level/Multi-Disciplines 1D / 3D Interface

Complete Motion-Based Simulation

Multi-body Dynamics

Control Systems

Fluid Power Actuation


Structural Dynamics

Electric Power Actuation


Force fighting using AMESim and a 3D Multi body tool


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Force fighting using AMESim and a 3D Multi-body tool

DisplacementRate

EHA(Electro Hydrostatic Actuator)

Force/Torque

Actuator

Sensor

LMS Virtual.LabMotion

LMS Imagine.LabAMESim

A d


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Agenda

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References

Conclusion

J t E i S t


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Jet Engine Systems

OIL SYSTEM

BLEED SYSTEM

GEAR BOX

FUEL SYSTEM

Flight Control Actuation System


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Flight Control Actuation System

Requirements for the complete system(Environmental conditions, force fighting, dynamic)

Architectural choice

Requirements for each subsystem/component Technical trade-off

Concept definition

Hydraulic Actuator

Cylinder

EHSV

Reservoir

Pump

Electrical motor

Controller

Air loadFluid characteristics

Electromechanical Actuator

ElectroHydraulic Actuator

Based on High Level Requirements earlydesign choices are made on the

architecture

Flight Controls Demonstrators in AMESim


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Flight Controls Demonstrators in AMESim

Demonstrators in Help

A Flight Control Library is available under :\AMESim\v1010\demo\Solutions\GroundLoads_FlightControl\ElectroHydraulicActuator\libfc

Associated with demos

Ground Loads Solution Overview


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The LMS Imagine.Lab Ground Loads solution delivers tools to handlelanding gear suspension, ext./retraction, braking and steering systems

Ground Loads Solution Overview

Ground Loads Demonstrators in AMESim


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Ground Loads Demonstrators in AMESim

Demonstrators in help

Simple Shock absorber

Extension/retraction model

Agenda


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Agenda

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References

Conclusion

AMESim rev11 at a glance


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AMESim rev11at a glance

New CFD-1D Line Models in the Thermal-Hydraulic library (N)

. making a major step towards uniformity betweenHydraulics and Thermal-hydraulics library !

Modeling improvements of Functional Valves to Simulate the impactof valve transient and hysteresis on the system performance withouthaving the full valve geometry

enhancing model continuity from high fidelity to real-time

Modeling improvements for Pumps and Motors

for a more flexible definition of efficiencies, dependingon the available experimental results or characteristics

.AND MANY MORE

Summary


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Summary

Complete environment for design and analysis of Hydraulics systemsallowing : Architecture trade-off

Dynamic / static simulation Multi-domain and multi-level simulation

Thermal effects introduction

Structural / mechanical interactions

Control integration as well as coupling with 3D CAE softwares

To generate models on real time platform for Virtual testing (Virtual iron Bird,simulators)

Reduce risk - uncover problems earlier in design process, before Iron Birdtests, before flight tests

Reduce (not eliminate) physical prototyping Reduce costs


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Upcoming LMS Web Seminars12 Dec 2011, 4H30 PM CET - Discovering Electrical System Simulation for the Aerospace Industry with

LMS Imagine.Lab AMESimMore info at www.lmsintl.com/webseminars

Questions: [email protected]

Please fill in the survey at the end of this presentation

Thank you

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Template presentation WEBEX 2010_SMD_Hydraulic_Nov2011_revGBA.pdf