using model-based systems engineering for rig-level safety automation

SPE/IADC-173087-MS

Using Model-Based Systems Engineering for Rig-Level Safety Automation

David Hetherington

Asatte Press

Ford Vehicle vs High-Specification Jackup

Paper # • Paper Title • Presenter Name

Slide 2

Is a high-specification jackup really several orders of magnitude simpler than a Ford minivan?

Limitations of Document Approach


Slide 3

Requirements Requirements Requirements Requirements Requirements Requirements

Requirements Requirements

System Specification

System Specification

Sub-System Specification Sub-System Specification



Component Specification

Component Specification Component

Specification


Specification


Specification




Specification


Specification




Specification


Specification


Specification


CHANGE!!

Requirements Requirements

Once the first wave of specifications have been generated, changes are very painful. As such, specifications are never revised. Instead, an avalanche of “TQ”s (“technical queries”) ensues.

Model-Based Systems Engineering Approach


Slide 4

Structure

Requirements

Behavior

The “Model-Based Systems Engineering” approach uses a sophisticated model database to keep track of all of the complex interlocking relationships in the system.

Model Contains Large Number of Simple Views


Slide 5

Diagrams are simple. Only the detail relevant to one stakeholder is shown. Underneath, the model database ties it all together.

Model Describes System Structure


Slide 6

Arbitrarily complex system structures can be modeled..

Model Describes Behavior


Slide 7

Behaviors and interactions can be modeled in detail.

MBSE – The Single Version of the Truth


Slide 8

MBSE is NOT:•A replacement for CAD tools•A replacement for specialized mathematical simulation tools•A replacement for existing software development tools

MBSE is:•A method of keeping all the key interlocking project assumptions in one place•A method of avoiding the “Death by Technical Query Avalanche” syndrome•A solid approach to automating the production of specifications and plans…•…Which in turn makes it practical to update all of those documents on a predictable, regular basis•…and in turn keep all of the different teams “On the Same Page”

MBSE – Two Main Approaches

Slide 9


SysML (Systems Modeling Language)

DSL (Domain Specific Language)

Cross industry standard. Used by defense, aerospace,

automotive, railroads, medical device makers.

SPE DSATS working on a SysML model.

Multiple tool vendors. Very powerful. Steep learning curve.

Customized for your team. Tools are actually “tool

workbenches” Workbench makes a graphic tool

that works with the symbols and rules your team already uses.

Very easy for your team to learn. No standardization.

Which Approach is Right for my Organization?

Slide 10


Organizations that Might be Best Served with SysML

Organizations that Might be Best Served with a DSL

Very large team. Large powerful IT tools support

organization. Strong preference for established

industry standards. Prefer tools from leading large

software vendors. No programming experts in the

team. Willing to invest in signicant

training.

Small, autonomous team. No centralized IT support. Strong focus on meeting team

objectives. Not so concerned about interoperation with the industry.

Can allocate one team member with strong programming skills to be the Toolsmith and support the rest of the team.

No time for training. Tools must look intuitively familiar.

Acknowledgements / Thank You / Questions

Slide 11

• Project was with Athens Group

• For more information on Model-Based Systems Engineering refer to: INCOSE Systems Engineering Handbook Version 3.2.2ISBN 978-1-937076-02-3

• For more information on SysML refer to: SysML Distilled by Lenny Delligatti ISBN 978-0-321-92786-9

• For more information on Domain Specific Languages refer to: Domain Specific Modeling by Steven Kelly and Juha-Pekka Tolvanen ISBN 978-0-470-03666-2

• Other questions can be directed to: [email protected]

using model-based systems engineering for rig-level safety automation

Engineering

paper title presenter

system structure paper

behavior paper

truth paper

sysml model

complex system structures

sophisticated model

model database ties