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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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