André Weiß, DLR Institute of Space Systems

Concurrent Evaluation – An Application for DLR’s Concurrent Engineering Facility

SECESA 2010, 13.-15. October, Lausanne, CH

Slide 2André 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 3André Weiß, DLR Institute of Space Systems

The Concurrent Engineering ProcessMost 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 4André Weiß, DLR Institute of Space Systems

Concurrent Evaluation – Example One

Mission Architecture Definition

Slide 5André Weiß, DLR Institute of Space Systems

Concurrent Evaluation – Mission Architecture Definition

Precursor to Concurrent Engineering studies

Mission Architecture Definitions result in a

10 to 15 pages long report on the following

topics:

• Science Objectives

• Science Implementation

• Mission Design

Requirements need to be defined

Slide 6André 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 7André 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 8André Weiß, DLR Institute of Space Systems

Concurrent Evaluation – Example Two

Risk Assessment

Slide 9André 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 10André Weiß, DLR Institute of Space Systems

Concurrent Evaluation – Risk Assessment

The Risk Assessment ProcessStep 1• Subsystem and Mission

analysisStep 2• Development of a system map

dependencies between components

functional relationshipsStep 3 (iterated for each failure)• Clear identification of failure as

well as its effects• Definition of possible solutions

or workarounds

Slide 11André Weiß, DLR Institute of Space Systems

Concurrent Evaluation – Example Three

Mission Extension Evaluation

Slide 12André 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 13André 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 14André Weiß, DLR Institute of Space Systems

Thanks for your attention!&

Any questions?