Hydraulic System Simulation 液压系统模拟

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Hydraulic System Simulation 液压系统模拟

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Hydraulic System Simulation
Delphine HERTENS
T1.1.2 Leader. Hydraulic System Engineer
AIRBUS
VIVACE Forum 2, The Hague, Netherlands
Oct. 24-26, 2006
© 2006 VIVACE Consortium Members. Page: 2 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Hydraulic system task context
􀀹 Objectives of the task
– Increase the level of simulation in hydraulic system design
– Increase hydraulic system simulation fidelity to contribute to
design cycle and costs reduction
􀀹 Hydraulic System simulation contributes to the renewal of
the systems development process by providing to flight
controls and handling qualities teams the most realistic
hydraulic model at the earliest
© 2006 VIVACE Consortium Members. Page: 3 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Hydraulic system overview
􀀹 Basic function of Aircraft Hydraulic system: to provide required power to
hydraulic consumers which are (mainly):
- Flight control surfaces (ailerons, elevator, rudder, spoilers, flaps…)
- Landing gear systems (extension and retraction, braking, steering…)
- Cargo doors, thrust reversers…
􀀹 Main components of Hydraulic system:
- Pumps
- Valves
- Filters
- Reservoir
- Indicating devices
- Pipes and fittings…
HSMU
RAT
PUMP
ENGINE 1
ENGINE 2
ENGINE 3
ENGINE 4
AILERONS
SPOILERS
AILERONS
SPOILERS
RUDDER
ELEVATOR
ELEVATOR
HYD
SYS
Hydraulic Reservoir
© 2006 VIVACE Consortium Members. Page: 4 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Hydraulic system simulation
Iterative work for sizing and
optimisation of:
- Hydraulic system
- Hydraulic consumers
- Flight control laws
HYDRAULIC
SYSTEM
CONSUMERS
Flight control
laws
Handling
quality
A/C behaviour towards
pilot order
© 2006 VIVACE Consortium Members. Page: 5 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Hydraulic task scenarios
SCENARIO 1
PRE-DESIGN
MODEL
Scenario
completed
Pre-design
model
􀀹Available early
􀀹Real time
􀀹Integration in flight
control simulation
platforms (multi-systems)
􀀹Base for more complete
models (later)
=>Improve flight control tests cases
fidelity
=>Reduce iterations, and iterations
time between hydraulic system and
flight control laws / handling quality
=>Earlier optimisation of hydraulic
generation
Tool: SCADE
Realistic but nevertheless simple, as required
􀀹System level
􀀹Flight control
laws and
handling quality
specialists use
DELIVERABLE TITLE
by
Author (Company)
Abstract:
This document describes…
Dissemination:
Deliverable/Output n°: Issue n°:
Keywords:
Detailed
model
􀀹Non real time
􀀹hysical dynamic
modelling
􀀹Stand-alone simulation
􀀹Coupled simulation with
flight control simulation
platform (not integrated in
multi-systems simulation
platforms)
=>Improve hydraulic model fidelity
=>Hydraulic system detailed
performances and behaviour
status
=>Earlier system verification and
validation
=>Reduce Iron Bird and flight tests
SCENARIO 2
DETAILED Tool: SABER
MODEL
On-going
work
􀀹System level
􀀹Hyd system
specialists use
More accurate
© 2006 VIVACE Consortium Members. Page: 6 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
OCASIME
OCASIME:
􀀹 desk top simulator workshop
􀀹 piloting function and virtual
cockpit
• Pre-design model integration and interfaces
OCASIME Flight Control Laws application
Hydraulic circuits
pressure level
indications
Hydraulic
consumers:
ATA27
ATA32
…
Hydraulic
pre-design
model
Engine
EDP rotational speeds
Required flows
Available delta-pressures
User settings
Fluid
temperature
EDP manual
switch off
Fluid
choice
ATA27 regulation
© 2006 VIVACE Consortium Members. Page: 7 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Main characteristics of the pre-design model (model content)
􀀹 Improvement of hydraulic elements modelling (manifolds, filters, priorityvalves
pressure drop)
􀀹 Choice between two types of fluids (high or low density)
􀀹 Choice of the fluid temperature (1)
􀀹 Priority valves (2) and low pressure switches logics modelled
􀀹 Engine driven pumps model using static curves (pressure / flow).
Overflow functioning part represented (3)
􀀹 Engine driven pumps switch off possible (apart from engine state) (4)
=> (1) / (2) / (3) / (4) 􀃆 Simulations with insufficient hydraulic power
possible (impact analysis)
􀀹 Overflow functioning detection function
􀀹 Interfaces compatibility with consumers models evolutions
© 2006 VIVACE Consortium Members. Page: 8 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Pre-design model other advantages:
􀀹 Integration into the complete hydraulic system model, including monitoring
and regulation functions and several accuracy levels
- Scade (language commonality)
- Development rules compatible with Airbus official procedure
- Upstream work with other simulation developers allowing:
to take benefit from previous aircraft simulation experience
to build compatible cross-models architectures
􀀹 Hydraulic models library creation (sub-parts “ready for use” for new aircraft
predesign model)
- Fluid data
- Fluid properties calculation (fluid data use)
- EDP
- Manifold
- Priority valve
- Low pressure switch
- Pressure drops calculations (linear, singular, total), pressures calculation
- Consumers pressures handling for display
© 2006 VIVACE Consortium Members. Page: 9 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Pre-design model benefices illustration
􀀹 Context: for comparison purpose 2 types of simulations run on Ocasime laws
platform:
- with hydraulic pre-design model
- without hydraulic pre-design model: pre-design model outputs disconnected and
replaced by constant “required minimum delta-pressures”
[Definition: consumer required minimum delta-pressure = minimum delta-pressure determined
for consumer sizing point and considered as minimum target for hydraulic system
performances]
􀀹 Flight control order
(theoretical side-stick order)
0 2 4 6 8 10 12 14 16 18 20 t(s)
DPPIL
Full stick (right) DPPIL
Full stick (left)
© 2006 VIVACE Consortium Members. Page: 10 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Pre-design model benefices illustration: case 1
􀀹 Conditions: low fluid temperature, all pumps running
􀀹 Simulation results: Aileron performance: comparison between "with…" or "without
pre-design model"
Aileron flow
Aileron available
delta-pressure
{1} Required flow (with pre-design model)
{1} Available delta-pressure with pre-design model
{2} Available delta-pressure without pre-design model
l/min
bar
s
s
required minimum
delta-pressure
=> With pre-design model: more available pressure (in that case)
© 2006 VIVACE Consortium Members. Page: 11 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Pre-design model benefices illustration: case 1 (continuation)
􀀹 Simulation results:
- Aileron performance: comparison between "with…" or "without pre-design model"
(continuation)
⇒ Position more realistic with pre-design model. In this case position reached is
closer to the order.
⇒ Maximal position gain observed: around 50%
(Definition: position gain = ({1}–{2}) / position order * 100)
Zoom on scenario 1:
hydraulic pre-design model
Position order
{1} Position response with pre-design model
{2} Position response without pre-design model
deg
Aileron position
Gain 50%
s
© 2006 VIVACE Consortium Members. Page: 12 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Pre-design model benefices illustration: case 1 (continuation)
􀀹 Simulation results:
- Roll speed: comparison between "with…" or "without pre-design model”
=> Maximal roll speed gain observed: around 16% (at beginning of motion)
(Definition: roll speed gain = absolute value [({1}–{2})/{1}] * 100, where {1} is the roll
speed with pre-design model and {2} is the roll speed without pre-design model)
􀀹 Conclusion: Case 1 illustrates how pre-design model could be used to
reduce:
- margins on (over)sizing of actuators or hydraulic system
- aircraft weight
20%
s
Roll speed difference (%)
© 2006 VIVACE Consortium Members. Page: 13 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Pre-design model benefices illustration: case 2
􀀹 Conditions: low fluid temperature, 1 pump off among the 2 available, additional high
flow requests from flaps motor and from one consumer downstream priority-valve
􀀹 Simulation results: priority-valve functioning: comparison between "with…" or
"without pre-design model"
=> Priority function activated: flow supply interrupted for
consumer downstream priority-valve
0 l/min
{1} Available flow downstream priority-valve, with pre-design model
{2} Available flow downstream priority-valve, without pre-design model
s
Available flow for consumers downstream priority-valve
© 2006 VIVACE Consortium Members. Page: 14 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Pre-design model benefices illustration: case 2 (continuation)
􀀹 Simulation results: priority-valve functioning: comparison between "with…" or
"without pre-design model" (continuation)
=> Priority valve operating is a new simulated functionality.
{1} Available delta-pressure downstream priority-valve, with pre-design model
{2} Available delta-pressure downstream priority-valve, without pre-design model
{1} Priority-valve state with pre-design model
{2} Priority-valve state without pre-design model (virtual)
priority-valve
opened
priority-valve
closed
0 bar
s
s
required
minimum
delta-pressure
Available pressure for consumer downstream priority-valve
Priority-valve status
© 2006 VIVACE Consortium Members. Page: 15 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Zoom on scenario 1:
hydraulic pre-design model
Pre-design model other benefits (not illustrated):
􀀹 Pre-design model also allows to simulate cases where flight control
surfaces answers are overestimated:
- cases where model underlines insufficient hydraulic power (very
low temperature for example)
􀀹 For such cases, as its answers are more realistic, pre-design model
could underline tuning necessities (flight control laws, actuators or
hydraulic system sizing, …) or flight limitations.
© 2006 VIVACE Consortium Members. Page: 16 24-26 October 2006
All rights reserved
TITLE OF THE SLIDE
VIVACE FORUM 2
Hydraulic task: conclusion
􀀹 Hydraulic task is integrated with Virtual Aircraft contribution.
􀀹 Hydraulic pre-design model is innovative because it helps to improve the
integration of hydraulic system in the pre-design phases of aircraft
development:
- Increased model fidelity
- Model available early: method and library of sub-parts available
􀀹 Business benefits:
- Actuators, flight control surfaces and hydraulic system sizing mature more early;
development time reduced
- Over-sizing margins reduction, weight gain
􀀹 The VIVACE contribution is already demonstrated and under exploitation:
- Pre-design model benefices illustration (cf. gain on flight control surfaces
simulated position or on simulated A/C trajectory)
􀀹 VIVACE hydraulic task way forward:
- Scenario 2 “detailed model” will be presented at Forum 3.

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