Functional analysis of a Carrier mission
in the frame of a Mars Sample Return
architecture
MBSE applied to early phase
mission design and concurrent
engineering
SECESA 2016
ESA UNCLASSIFIED – For Official Use - Privileged
Content
•
Motivation for implementing Functional Analysis in CDF
•
MSR Carrier Mission overview
•
Capella tool and Arcadia method
•
Functional Analysis
•
Added value and next steps
MSR Carrier| Slide 2
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Motivation
•
Model Based System Engineering is implemented in the CDF processes through
the Open Concurrent Design Tool used a central model for all the domain of
expertise.
•
Functional analysis is however generally not realized in Phase 0 studies. The
aim of this study is to investigate what benefits could a functional analysis in
CDF bring and how to implement it.
•
This will be done through a study case: MSR Carrier CDF Study realized in
June-July 2016.
MSR Carrier| Slide 3
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
CDF Reference Architecture Reflecting Recent
Bilaterals (NASA)
Stationary
MAV with
fetch rover
2022
Courier docks
with NeMO and
grabs
biocontainer
2020
MSR Carrier| Slide 4
2022
NeMO
with
capture
& sealing
system
Courier returns to Earth
2026
SRL
2026/2028
“Courier”
With ERC
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Updated iMARS Architecture Reflecting Recent
Bilaterals (NASA)
Stationary
MAV with
fetch rover
2022
Courier docks
with NeMO and
grabs
biocontainer
2020
MSR Carrier| Slide 5
2022
NeMO
with
capture
& sealing
system
Courier returns to Earth
2026
SRL
2026/2028
“Courier”
With ERC
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
MSR Carrier mission phases overview
6) Mars – Earth Transfer
7) ERC separation
and CM disposal
5) Departure Orbit
Acquisition
4) Rendezvous
and Docking
8) Re-entry
1) Launch
and direct
escape
M
E
MOI, TOA,
DOA, TEI
3) Target Orbit Acquisition
incl. aerobraking
2) Earth – Mars Transfer
MSR Carrier| Slide 6
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Capella and Arcadia Methodology
Step by step build up of the functional
analysis:
•
Operational Analysis: what the user
need to accomplish
•
System analysis: What the system
need to accomplish (functional
breakdown)
•
Logical analysis: how the system
will fulfill all the functions (allocate
the functions to components without
specifying their physical
implementation)
•
Physical analysis: what will compose
the system (physical architecture)
MSR Carrier| Slide 7
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Functional Breakdown
MSR Carrier| Slide 8
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
System Architecture
MSR Carrier| Slide 9
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Rendezvous and Docking Architecture
MSR Carrier| Slide 10
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Implementing Functional analysis in
CDF
In order to implement functional analysis in the frame of a CDF study some processes
need to be tailored to the particularities of conceptual design:
•
Separate between support functions and key missions functions will allow re-use the
support functions and focus the analysis on their interactions with the objective
fulfilling functions.
•
Next steps:
–
Define template Support Functions in discussion with Domain Experts
–
Interface Functional analysis tool with OCDT for the physical architecture
–
On-going activity on requirement management in OCDT
–
Investigate if functional analysis could be done in a concurrent way (define
exchange model ? Define responsibilities? )
MSR Carrier| Slide 11
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Thank you for your attention
MSR Carrier| Slide 12
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Back-up slides
MSR Carrier| Slide 13
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Logical Architecture subsystems
Assigning functions exchanges to
components exchanges allows to
sketch the needed physical
interfaces. I.e. the I/F between
NeMO and MSR-C needs to:
•
Allow docking from NeMO to
MSR-C
•
Allow the BC to transfer from
NeMO to MSR-C
Multiple physical implementation
can fulfill this logical architecture.
MSR Carrier| Slide 14
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Implementing Functional analysis in
CDF
In order to implement functional analysis in the frame of a CDF study some
processes need to be tailored to the particularities of conceptual design:
•
Separate between support functions and key missions functions will allow reuse the support functions and focus the analysis on their interactions with the
objective fulfilling functions.
•
Project is ongoing to improve Requirement management in the CDF through
OCDT. If this is interfaced with a Functional analysis tool, rules could be defined
and checked to verify the completeness of the design, i.e.:
– Are all the requirements realized through functions ?
– Are all the functions allocated to components ?
MSR Carrier| Slide 15
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Benefits and next step
Implementing functional analysis (through MBSE) in conceptual phase would allow
to:
•
Promote MBSE throughout out the life time of the design.
•
Increase quality, consistency and reusability of early design.
•
Allow for a better overview of the design and the design progress
To take full advantage of both functional breakdown and concurrent design, clear
responsibilities have to be defined to allow the domains of expertise presents in a
CDF Study to define the functions required from their subsystem.
MSR Carrier| Slide 16
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
System Modes and Scenarios
MSR Carrier| Slide 17
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Logical Architecture
MSR Carrier| Slide 18
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Functional Breakdown
MSR Carrier| Slide 19
ESA UNCLASSIFIED – For Official Use - Privileged
Systems
Functional Breakdown
MSR Carrier| Slide 20
ESA UNCLASSIFIED – For Official Use - Privileged
Systems