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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"
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