Concurrent Evaluation – An Application for DLR’s
Concurrent Engineering Facility
SECESA 2010, 13.-15. October, Lausanne, CH
André Weiß, DLR Institute of Space Systems
Content
1. The Concurrent Engineering Process
2. Concurrent Evaluation – Three Examples
•
Mission Architecture Definition
• Risk Assessment
• Mission Extension Evaluation
3. Conclusion
Slide 2
André Weiß, DLR Institute of Space Systems
The Concurrent Engineering Process
Most important features of Concurrent
Engineering:
• Interdisciplinary Team
• Well-defined, Streamlined Approach
• Accelerating the Design Process
• Responds to Customer Needs
• Consistent Level of Understanding
• Whole is More Than Sum of its Parts
 Adapt for Evaluation Purposes
Slide 3
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Example One
Mission Architecture Definition
Slide 4
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Mission Architecture Definition
Precursor to Concurrent Engineering studies
 Requirements need to be defined
Mission Architecture Definitions result in a
10 to 15 pages long report on the following
topics:
•
•
•
Science Objectives
Science Implementation
Mission Design
Slide 5
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Mission Architecture Definition
The Process
Step 1
• Introduction of the general
concept through the customer
• Payload and Mission analysis
Step 2
• Identification of possible Mission
Scenarios
Step 3 (iterative for each scenario)
• Definition of domain-specific tasks
• Evaluation of requirements due to
payload or environment
Slide 6
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Mission Architecture Definition
SWON – The Prototype Study
Objective
• Observation of the Solar Far Side wrt Space Weather
Implementation
• Network of landers on multiple Inner-Earth asteroids
Mission Design
• Due to lack of experience, a full network mission proved to be not feasible
• Alternate mission scenario:
 Technology demonstrator mission to a single asteroid
 Additional asteroid research-related payload
Slide 7
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Example Two
Risk Assessment
Slide 8
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Risk Assessment
Based on Risk Management
• Failure Modes and Effects Analysis
(FMEA)
• Fault Tree Analysis (FTA)
 Characteristic elements were
identified
 Implemented in the Concurrent
Evaluation process
Slide 9
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Risk Assessment
The Risk Assessment Process
Step 1
•
Subsystem and Mission
analysis
Step 2
•
Development of a system map
 dependencies between
components
 functional relationships
Step 3 (iterated for each failure)
•
Clear identification of failure as
well as its effects
•
Definition of possible solutions
or workarounds
Slide 10
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Example Three
Mission Extension Evaluation
Slide 11
André Weiß, DLR Institute of Space Systems
Concurrent Evaluation – Mission Extension Evaluation
53% of exploration spacecrafts
exceeded initial mission goals
 Mission extensions have become
quite common
The intention:
• Streamlining through concurrent
approach
• Responding to customer needs
 Optimal “science return / cost”
ratio
Slide 12
André Weiß, DLR Institute of Space Systems
Conclusion
Extend the concurrent approach across other phases
Done elsewhere:
Phase B
 Concurrent Reviewing
Analyzed here:
Concurrent Evaluation
 Adaptation of established
methodologies
 Definition of a new process
Slide 13
André Weiß, DLR Institute of Space Systems
Thanks for your attention!
&
Any questions?
Slide 14
André Weiß, DLR Institute of Space Systems