Dr. Sebastian Herzig Profile

Dr. Sebastian Herzig

Software Systems Engineer at Jet Propulsion Lab

SPIE Involvement:

Author

Proceedings Article | 10 July 2018 Presentation + Paper

The OpenSE Cookbook: a practical, recipe based collection of patterns, procedures, and best practices for executable systems engineering for the Thirty Meter Telescope

Robert Karban, Amanda Crawford, Gelys Trancho, Michele Zamparelli, Sebastian Herzig, Ivan Gomes, Marie Piette, Eric Brower

Proceedings Volume 10705, 107050W (2018) https://doi.org/10.1117/12.2312281

KEYWORDS: Systems modeling, Systems engineering, Thirty Meter Telescope, Monte Carlo methods, Error analysis, Observatories, Reverse modeling, Model-based design, Adaptive optics, Wavefronts

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The OpenSE Cookbook is an open-sourced collection of patterns, procedures, and best practices targeted for systems engineers who seek guidance on applying model-based and executable systems engineering (MBSE) using SysML. Its content has emerged from the system level modeling effort on the European Framework Program 6 (FP6) and the Thirty Meter Telescope (TMT). The TMT MBSE approach applied the Executable Systems Engineering Method (ESEM) and the open-source Engineering Environment (OpenMBEE) to specify, analyze, and verify requirements of TMT’s Alignment and Phasing System (APS) and the Narrow Field Infrared Adaptive Optics System (NFIRAOS). In these applications, implicit dependencies are made explicit in a formal model through the use of ESEM, OpenMBEE, and SysML modeling constructs. The value proposition for applying this MBSE approach was to establish precise requirements and fine-grained traceability to system designs, and to verify key requirements beginning early in development. The integration of ESEM and the OpenMBEE tooling infrastructure (providing linked-data and web-operability) is a significant added value for the MBSE approach. The APS is responsible for the overall pre-adaptive optics wavefront quality, using starlight to measure wavefront errors and align the TMT optics. In the formally integrated and executable SysML model, simulations are performed to analyze the impact of changed requirements and verify specified constraints for various operational scenarios.

The APS team used several modeling patterns to capture information such as the requirements, the operational scenarios, involved subsystems and their interaction points, the estimated or required time durations, and the mass and power consumption. Adaptive optics systems are designed to sense real-time atmospheric turbulence and correct the telescope’s optical beam to remove its effect. The system model for the adaptive optics operational modes was developed to capture sequence behaviors and operational scenarios to run Monte-Carlo simulations for verifying acquisition time, observing efficiency, and operational behavior requirements. The model is particularly useful for investigating the effect of parallelization, identifying interface issues, and re-ordering sequence acquisition tasks. A former version of the Cookbook (which is now updated to MBSE challenges, goals, and lessons learned) included modeling guidelines and conventions for all system aspects, hierarchy levels, and views, which were developed during for the Active Phasing Experiment (APE), an opto-mechatronical system technology demonstrator for the Extremely Large Telescope (ELT). The Cookbook utilizes the above mentioned system models as real-world case-studies to demonstrate and document the applications of the recipes, providing also instructional examples and addressing the available tooling support. The Cookbook is accompanied by a number of SysML models and aodel libraries which facilitate model authoring and maintenance. The Cookbook covers the different aspects of Systems Engineering such as management of Requirements, Design (behavior and structure), Interfaces, Interdisciplinary Integration, Analysis, Trade Studies, and Technical Resources. This paper presents the background, motivation, architecture, and highlights some key content of the Cookbook. For example, interface management, error budget management, requirements verification, Monte Carlo driven analysis, and timing analysis of operational scenarios. The paper discusses how the capabilities of OpenMBEE contributed significantly to the adoption of executable systems engineering.

Proceedings Article | 10 July 2018 Presentation + Paper

Verifying Interfaces and generating interface control documents for the alignment and phasing subsystem of the Thirty Meter Telescope from a system model in SysML

Sebastian J. Herzig, Robert Karban, Gary Brack, Scott Michaels, Frank Dekens, Mitchell Troy

Proceedings Volume 10705, 107050V (2018) https://doi.org/10.1117/12.2310184

KEYWORDS: Systems modeling, Interfaces, Thirty Meter Telescope, Control systems, Databases, Systems engineering, Cameras, Mirrors, Model-based design, Astronomy

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Proceedings Article | 18 August 2016 Paper

Creating system engineering products with executable models in a model-based engineering environment

Robert Karban, Frank Dekens, Sebastian Herzig, Maged Elaasar, Nerijus Jankevičius

Proceedings Volume 9911, 99110B (2016) https://doi.org/10.1117/12.2232785

KEYWORDS: Systems modeling, Data modeling, Model-based design, Thirty Meter Telescope, Systems engineering, Systems modeling, Model-based design, Telecommunications, Solid modeling, Process modeling, Control systems, Computer aided design

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Proceedings Article | 27 July 2016 Paper

The alignment and phasing system for the Thirty Meter Telescope: risk mitigation and status update

Mitchell Troy, Gary Chanan, Scott Michaels, Frank Dekens, Randy Hein, Sebastian Herzig, Robert Karban, Carl Nissly, Jennifer Roberts, Michael Rud, Byoung-Joon Seo

Proceedings Volume 9906, 99066A (2016) https://doi.org/10.1117/12.2231913

KEYWORDS: Telescopes, Wavefronts, Control systems, Mirrors, Cameras, Thirty Meter Telescope, Image segmentation, Stars, Charge-coupled devices, Sensors

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Conference Committee Involvement (2)

Modeling, Systems Engineering, and Project Management for Astronomy IX

14 December 2020 | Online Only, California, United States

Modeling, Systems Engineering, and Project Management for Astronomy IX

13 December 2020 | San Diego, California, United States

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