On November 22nd in Rome, Italy, PhD student from the Jade Research Group, Chu Xu, gave a presentation "Coupling of Electromagnetic and Thermal Reduced-Order Models for Busbars in Electrolyzer Plants" at the 9th International Conference on Renewable Energy and Conservation (ICREC 2024).

Chu Xu gives the presentation

On November 22nd, PhD candidate in 'Jade2Pro', Chengdong Yuan, successfully finished his PhD defense at University Rostock.

Chengdong Yuan gives the presentation

Chengdong Yuan and his main supervisors, Prof. Hohlfeld and Prof. Bechtold

On October 28th, at Fraunhofer ENAS in Chemnitz, Chengdong Yuan gave a presentation and exchanged regarding compact digitial twin activities at project MikroVAL. Furthermore, the latest functions developed in software "Model Reduction inside ANSYS" were introduced to the audiences.

Chengdong Yuan gives the presentation in the workshop

During the InterPACK conference in San Jose, CA, Prof. Tamara Bechtold gave a short course to introduce model order reduction and Chengdong Yuan gave the presentation "Re-Integrating a Reduced-Order Model into Finite Element Environment for Thermo-Mechanical Reliability Analysis in Microelectronics".

Chengdong Yuan gives the presentation in InterPACK conference

During the MikroVAL project partners' meeting and the ESTC conference in Berlin, Chengdong Yuan gave the presentation "Re-Integrating a Reduced-Order Model into Finite Element Environment for Thermo-Mechanical Reliability Analysis in Microelectronics".

Group photo with MikroVAL project partners

Chengdong Yuan gives the presentation in ESTC conference

The research group meeting between the University of Rostock and Jade University of Applied Sciences was successfully held in Wilhelmshaven.

(From left to right)  A. Taghdiri (Uni Rostock), Arwed Schütz (organizer of this meeting), Prof.Dr.-Ing. Dennis Hohlfeld (Uni Rostock), Siyang Hu, Prof.Dr.-Ing. Tamara Bechtold, Sönke Maeter (CADFEM GmbH), Chengdong Yuan, Chu Xu

Photo with 'WHV'; Jade bay boat trip!

Our Jade research group attended EuroSimE 2024 (25th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems) in Catania, Sicily, Italy, from April 8 - 10, 2024. The researchers from the Jade group presented their latest research findings.

• C. Yuan, S. Maeter, A. Schütz, I. Zawra, M. v. Soestbergen, T. Bechtold, 'Efficient Simulation of Nonlinear Plastic Models in Microelectronics: A Trajectory Piecewise Linear-Based Model Order Reduction'.
• C. Yuan, M. Niessner, T. Bechtold, 'Model Order Reduction of a Microelectronic Package Subjected to Temperature Cycling and Vibration Test'.
• A. Schütz, T. Bechtold, 'Model Order Reduction of an Electromagnetic Actuator with Moving Components via Piecewise Quadratic Coupling'.
• S. Hu, B. Manansala, T. Bechtold, 'Bi-directional Evolutionary Structural Optimization of Multi-Resonant MEMS'.
• U. Fitzer, P. Goyal, A. Schütz, I. Zawra, D. Hohlfeld, T. Bechtold, 'Comparison of Model Order Reduction Methods for a Linear Finite Element Model of an Electrically Stimulated Neuron'.

Jade Research Group: A. Schütz, U. Fitzer, Prof. T. Bechtold, S. Hu, C. Yuan

C. Yuan and A. Schütz give presentations at the conference

S. Hu and U. Fitzer introduce their posters to other participants

Our Jade research group attended PowerMEMS 2023 (The 22nd International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications) in Abu Dhabi, UAE during December 11 - 14, 2023. The researchers from the Jade group presented their latest research findings.

• C. Yuan, A. Schütz, D. Hohlfeld, T. Bechtold, 'Matrix Interpolation-Based Parametric Model Order Reduction of a Miniaturized Electromagnetic Model'.
• Y. Rao, M. Voss, T. Bechtold, D. Hohlfeld, 'Implantable Thermoelectric Generator with High Aspect Ratio Thermolegs and Integrated Voltage Converter'.

Yongchen Rao and Chengdong Yuan give oral presentations

Jade2Pro PhD students: Yongchen Rao, Arwed Schütz and Chengdong Yuan

The 6th research group meeting between the University of Rostock and Jade University of Applied Sciences was successfully held in Rostock. This time, we had external guests from the Leibniz Institute for Solid State and Materials Research Dresden (IFW), who gave a presentation of Micro-thermoelectric devices.

Jade Research Group: (From left to right) Arwed Schütz, Chu Xu, Ibrahim Zawra, Ulrike Fitzer, Prof.Dr.-Ing. Tamara Bechtold, Chengdong Yuan, Chisom Umunnakwe, Siyang Hu, Yongchen Rao

University Rostock Lab tour

Poster session

Arwed Schütz won the outstanding paper prize and Ibrahim Zawra won the best poster prize in EuroSimE 2023!

Our Jade research group attended EuroSimE 2023 (24th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems) in Graz, Austria during April 16 - 19, 2023. The researchers from the Jade group presented their latest research findings.

• A. Schütz, T. Bechtold, 'Matrix Interpolation-Based Parametric Model Order Reduction of Electromagnetic Systems with Translational Movement'.
• C.B. Umunnakwe, I. Zawra, E.B. Rudnyi, M. Niessner, T. Bechtold, 'Thermo-Mechanical Super-Element of a Packaged-Chip Model for the Reintegration of Reduced State-Space Models into Finite Element Analysis Tools'.
• I. Zawra, C.B. Umunnakwe, M. van Soestbergen, E.B. Rudnyi, T. Bechtold, 'Stress Recovery in the Reduced Space for Parametric Reduced Models in Microelectronics'.
• C. Yuan, D. Hohlfeld, T. Bechtold, 'Towards System-level Simulation of an Electromagnetic Energy Harvester Model via Equivalent Circuit Extraction from ANSYS Maxwell 3D'.
• U. Fitzer, D. Hohlfeld, T. Bechtold, 'Neuron-Electrode Interface with Hodgkin-Huxley Model in ANSYS'.

Prof. Bechtold gives a short course 'Efficient Thermal Simulation Using Compact Models'

C.B. Umunnakwe, A. Schütz, C. Yuan, U. Fitzer, and I. Zawra introduce their work to other participants

On March 17, 2023, Yongchen Rao and Prof. Bechtold were invited by Prof. Nielsch to give a presentation with the title of “Model-Based Design and Fabrication of an Implantable Thermoelectric Generator” at the Leibniz Institute for Solid State and Materials Research (IFW) in Dresden. Then they visited labs in the aspect of Atomic Layer Deposition (ALD), nanopowder and thermoelectric characterization.

M. Sc. Ibrahim Zawra won the 500 € prize for his inspiring presentation at Rostock Science Camp!

Since November 1, 2022, M. Sc. Chu Xu has been granted a scholarship by the Ph.D. project (Jade2Pro-program) for the research project "Simulation-based optimum design for safe and reliable operation of industrial-scale hydrogen electrolyser" involving Jade University of Applied Sciences and the University of Rostock.

During July 28 - 30, the 9th International Conference on Biomedical Engineering and Systems (ICBES'22) was delivered in person in Prague, Czech Republic, and virtually for the people who can not travel for any reason. The conference topics focus on Biotechniques. Ph.D. student Ulrike Fitzer from our Jade research group gave the oral presentation titled "Reduced Order Model of a Neuron-Electrode Interface Coupled to a Hodgkin-Huxley Model" and got the chance to connect with researchers from across the globe. Ms. Fitzer was honored with the best paper award! 

Ulrike Fitzer presents her research results

The 10th Vienna International Conference on Mathematical Modelling (MathMOD 2022) took place in Vienna from July 27 - 29. It provides a forum for professionals, researchers, and experts in the field of theoretic and applied aspects of mathematical modelling for systems of dynamic nature. The researchers from the Jade group gave oral presentations and got a good chance to communicate with other researchers from the world.

• S. Hu, U. Fitzer, S. Stindt, T. Bechtold, "Topology Optimization of a Folded Beam Piezoelectric Energy Harvester".
• C. Yuan, S. Hu, T. Bechtold, "Stable Parametric Model Order Reduction of Piezoelectric Energy Harvester by Matrix Interpolation".

Siyang Hu and Chengdong Yuan

From July 11-14, the 2022 edition of the SCEE conference took place in Amsterdam. It was a festive event, marking 25 years of SCEE conferences. With 8 invited speakers, 30 oral presentations and 25 poster presentations, it was a lively event with high level talks and good discussions. The researchers from the Jade group presented their posters:

• S. Hu, S. Stindt, T. Bechtold, "Efficient Topology Optimization of a Piezoelectric Energy Harvester".
• I. Zawra, J. Zaal, M. van Soetsbergen, T. Hauck, E. Rudnyi, T. Bechtold, "Compact Modelling of Wafer Level Chip-Scale Package via Parametric Model Order Reduction".
• C. Yuan, A. Schütz, T. Bechtold, "Algebraic Parameterization and Parametric Model Order Reduction of a Miniaturized Thermoelectric Generator".

Siyang Hu, Ibrahim Zawra (right), and Chengdong Yuan present their posters

From July 05 - 06, the 11th EASS conference took place in Erfurt. The conference is all about the sensible development of technology. Companies and research institutions are invited to consider approaches that target "smart-connected" and resource-efficient products.

Yongchen Rao from our Jade research group published a full paper and gave an oral presentation titled "Fabrication Strategy for a Thermoelectric Generator with Highaspect-ratio Thermolegs for Electrically Active Implants". The topic focuses on how the sensor systems can be built in a maximally energy-saving way and/or supplied with energy from the environment. The goal is an energy-saving expansion of the general networking of measurement systems.

The 4th research group meeting between University of Rostock and Jade University of Applied Sciences was successfully held in Wilhelmshaven. This time, we had an external guest from the Karlsruhe Institute of Technology (research group of Prof.Dr. Jan G. Korvink), Mr. Chau, who also gave a nice presentation on his research work.

(From left to right) Siyang Hu, Chengdong Yuan, Chisom Umunnakwe, Khai Chau, Billy Manansala, Prof.Dr.-Ing. Tamara Bechtold, Prof.Dr.-Ing. Dennis Hohlfeld, Sönke Maeter, Yongchen Rao

A discussion between Khai Chau and Prof.Dr.-Ing. Dennis Hohlfeld after the presentation

Discussion during the coffee break; Big thanks to the meeting organizer Siyang Hu!

See more reports in "Jade Newsroom".

Ulrike Fitzer receives the award in Oldenburg

EuroSimE 2022 (23rd International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems) was held in Malta during April 25 - 27, 2022. The young researchers from the Jade group presented their latest research findings.

• Y. Rao, C. Xu, T. Bechtold, D. Hohlfeld, 'Packaged Thermoelectric Generator with High-aspect-ratio Thermocouple Legs for Electrically Active Implants'.
• A. Schütz, T. Bechtold, 'Performance Comparison for Stable Compact Modelling of Piezoelectric Microactuator'.
• C.B. Umunnakwe, I. Zawra, C. Yuan, E.B. Rudnyi, D. Hohlfeld, M. Niessner, T. Bechtold, 'Model Order Reduction of a Thermo-Mechanical Packaged Chip Model for Automotive MOSFET Applications'.
• U. Fitzer, D. Hohlfeld, T. Bechtold, 'Reduced Order Modelling of a Neuron-Electrode Interface'.

PhD student Chisom Umunnakwe presents his research results from COMPAS project; PhD student Ibrahim Zawra presents the poster of Mr. Schütz

In the last three days, the meeting of the DFG-Priority program KOMMMA was successfully held in Jade University of Applied Sciences. Professors and PhD students from the project presented their research results for the discussion.

Group photo of the members from the KOMMMA project

Prof.Dr. Ulrike Wallrabe (University of Freiburg), Prof.Dr. Manfred Kohl (Karlsruhe Institute of Technology), and the Jade research group leader Prof.Dr.-Ing. Tamara Bechtold

Recently, young researchers in our group published their research results in the special issue "Cooperative Microactuator Systems" of the journal "Actuators" by MDPI:

• A. Schütz, S. Maeter, T. Bechtold, "System-Level Modelling and Simulation of a Multiphysical Kick and Catch Actuator System", Actuators 2021, 10, 279.

From July 7 to 9, 2021, Jade-Rostock research group meeting was successfully held in University of Rostock after the COVID-19 pandemic. The meeting started with a brief introduction of undering-going and proposed projects presented by Prof. Bechtold. During the meeting, all students presented their research results and exchanged ideas with others.

Presentations:

• Chisom Umunnakwe: "Krylov Subspace Based Model Order Reduction Techniques"
• Ibrahim Zawra: "State of the Art for Nonlinear Model Order Reduction"
• Chengdong Yuan: "Parametric MOR for Geometrically Parameterized Energy Harvester Devices"
• Jelena Petrovic: "Optrodes - Miniature Light Delivery Solutions for Optogenetics"
• Prof. Dr. -Ing. Dennis Hohlfeld: "Modelling Needs and Optimization Potential for Electronics Cooling"
• Siyang Hu: "Numerical Methods for the optiMuM Project"
• Simon Stindt: "TO eines PEH Energy Harvester in Python und ANSYS" (thesis defense)
• Ulrike Fitzer: "Topology Optimization of Resonant Structures" (thesis defense)
• Sofiane Bouhedma: "A Frequency-agile Energy Harvester with Optimized Performances"
• Yongchen Rao: "Fabrication of a Miniaturized TEG Based on Design Optimization"
• Gunasheela Sadashivaiah: "Novel Modelling and Simulation Approaches for MEMS Devices"
• Sönke Maeter: "FE Analysis of Microelectromechanical Actuators" (thesis defense)
• Arwed Schütz: "System-Level Simulation of a Multiphysical Kick & Catch Actuator System"

(From left to right) Prof.Dr.-Ing Dennis Hohlfeld, Yongchen Rao, Ibrahim Zawra, Chu Xu, Ulrike Fitzer, Prof.Dr.-Ing Tamara Bechtold, Siyang Hu, Chisom Umunnakwe, Chengdong Yuan, Simon Stindt, Arwed Schütz

Sunset bike trip from Warnemünde

EuroSimE 2021 virtual event was held online during April 19 - 22, 2021. In this event, papers from our research group were accepted and presented:

• Y. Rao, S. Bouhedma, T. Bechtold, D. Hohlfeld, 'Parametric Simulation of a Packaged Thermoelectric Generator for Electrically Active Implants'.
• S. Hu, U. Fitzer, T. Bechtold, 'Topology Optimization of Miniaturized Piezoelectric Energy Harvester'.
• C. Yuan, T. Bechtold, 'Geometrically Parametrized Reduced Order Model of a Miniaturized Thermoelectric Generator for Electrically Active Implants'.

European research project COMPAS has been started since 01.03.2021. Prof. Bechtold will lead the research group in Jade University of Applied Sciences to provide the solutions for developing novel, compact models and ultra-compact digital twins. Two new Ph.D. students , M.Sc. Chisom Umunnakwe and M.Sc. Ibrahim Zawra joined our research group. 

Chisom Umunnakwe                       Ibrahim Zawra

On July 16, 2020, M. Sc. Arwed Schütz was awarded the "Study Award 2020 of the VDE Region North-West" for his extraordinary performance in studying electrical engineering.

Due to the coronavirus pandemic, the EuroSimE 2020 was held online during July 06 - 08, 2020. In this event, four papers from our research group were accepted and presented:

• (keynote) C.D. Yuan, D. Hohlfeld and T. Bechtold, “Design Optimization of a Miniaturized Thermoelectric Generator”.
• S.Y. Hu, A. Schütz, S. Bouhedma, D. Hohlfeld and T. Bechtold, “Design Optimization of a Multi-Resonant Folded Beam Piezoelectric Energy Harvester”.
• A. Schütz, S.Y. Hu, E.B. Rudnyi and T. Bechtold, “Electromagnetic System-Level Model of Novel Free Flight Microactuator”.
• Y.C. Rao, S. Bouhedma, C.D. Yuan, T. Bechtold and D. Hohlfeld, “Towards a System-Level Model of a Tunable Dual-Frequency Piezoelectric Energy Harvester”.

On May 07, 2020, our research paper "Stable Compact Modeling of Piezoelectric Energy Harvester Devices" was published in COMPEL-The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, volume 39, issue 2.

On April 24, 2020, our research paper "Towards Efficient Design Optimization of a Miniaturized Thermoelectric Generator for Electrically Active Implants via Model Order Reduction and Submodeling Technique" was published in International Journal for Numerical Methods in Biomedical Engineering, volume 36, issue 4.

Since January 2020, M. Sc. Arwed Schütz pursuing a Ph.D. within the DFG-funded research project "Kick and Catch - cooperative microactuators for freely moving platforms" at the Jade University of Applied Sciences in cooperation with the University of Augsburg.

Since November 1, 2019, M. Sc. Yongchen Rao has been granted a scholarship by the Ph.D. project (Jade2Pro-program) for the research project 'Fabrication strategies for high efficiency thermoelectric generators for electrically active implants' involving Jade University of Applied Sciences and the University of Rostock.

Jade2Pro Ph.D. student Chengdong Yuan's Paper "A Combination of POD-based Model Order Reduction and Thermal Submodeling for Miniaturized Thermoelectric Generator" has been accepted and presented as a poster in MicroSystemTechnik Kongress 2019, Berlin. A meeting with the research group from Univerisity of Rostock was held in MST Kongress.

Chengdong Yuan and Prof. Dr. -Ing. Tamara Bechtold; Sofiane Bouhedma, Chengdong Yuan, Ph.D. Ekaterina Sergeeva, Prof. Dr. -Ing. Dennis Hohlfeld

From June 11 to June 14, 2019, Jade2Pro Ph. D. student Chengdong Yuan attended the 33rd International ECMS Conference on Modelling and Simulation in Caserta, Italy. He published the paper "Efficient Design Optimization of a Thermoelectric Generator by a Combination of Model Order Reduction and Thermal Submodeling Techniques" and gave the presentation in the conference.

From May 20 to May 24, 2019, Prof. Bechtold and Ph. D. student Siyang Hu attended the World Congress on Structural and Multidisciplinary Optimization (WCSMO) in Beijing, China.

Jade2Pro Ph.D. student Siyang Hu published the paper "Fast Topology Optimization for Resonating Structures via Generalized Incremental Frequency Method and Modal Superposition-Based Model Order Reduction" and presented his paper at the conference. 

Prof. Dr. -Ing. Tamara Bechtold was the Chair of Session 'Dimension Reduction'.

Siyang Hu; Prof. Dr. -Ing. Tamara Bechtold

On March 24, 2019, Prof. Bechtold has given the short course "System-Level Simulation of Mircosystems - MOR" in conference EuroSimE 2019 in Hannover.

Description: The rapid progress in microelectromechanical systems (MEMS) and the evolution from a limited set of well-established applications, examples, in automotive industry, print heads, and digital light projection, to other fields mainly driven by consumer applications (such as image stabilization, smart phones, game consoles, etc.) opens a new market for these devices. It simultaneously creates the need for fast, efficient, and adequate design and optimization tools not only for stand-alone devices, but also for entire multiphysics microsystems comprising the MEMS component, the attached control and read-out circuitry and the package, while additionally considering environmental impacts potentially affecting the system functionality. 
This 4 hours hand-on course provides an overview of system-level modelling methodologies for microsystems and offers an oportunity to test the industrial standard tool "Model Reduction inside ANSYS". 

Course Outline: 

Part 1: Compact Modeling of Microsystems by Means of Model Order Reduction - Theory

• MOR: Principle and Methods

• MEMS Case Studies

Part 2: Hand on MOR

• Model Reduction inside ANSYS

• System-Level Simulation with ANSYS Twin Builder

Literature:'System-Level Modeling of MEMS' (T. Bechtold, G. Schrag, L. Feng Edt.), by Wiley-VHC book series on Advanced Micro and Nanosystems 2013. 

Who Should Attend: The course is designed for anyone interested in system-level modelling and simulation. Being an ANSYS user is an advantage, but it is not mandatory.

From September 22 to 27, 2018, the 12th International Conference in Scientific Computing in Electrical Engineering (SCEE) was hosted in Taormina, Sicily, Italy. Two papers from our group have been accepted and presented in the conference.

Siyang Hu, Chengdong Yuan, Tamara Bechtold. "Quasi-Schur Transformation for the Stable Compact Modeling of Piezoelectric Energy Harvester Devices".

Onkar Jadhav, Evgenii Rudnyi, Tamara Bechtold. "Load Snapshot Based Nonlinear-Inut Model Order Reduction of a Thermal Human Tissue Model".

On May 22, 2018, the 32th European Conference on Modeling and Simulation (ECMS) has been held in the Jade University of Applied Sciences.

A group meeting with Prof. Dr. -Ing. Mashuq un Nabi and his research group from Indian Institue of Technology Delhi was held by Prof. Dr. -Ing. Tamara Bechtold during the conference.

Paper "Parametric Model Order Reduction of a Thermoelectric Generator for Electrically Active Implants" has been accepted and presented at the 19th EuroSimE in Toulouse, France.

In this paper, we analyzed a human tissue thermal model incorporated within an implanted thermoelectric generator (TEG). The impact of convection effect at the skin surface was studied based on a film coefficient and ambient temperature parameters-independent reduced order model obtained through parametric model order reduction (pMOR) method. We proposed to perform efficient parameter studies and system-level simulation based on the reduced TEG.

Student contribution "Implicit Schur Complement for Model Order Reduction of Second Order Piezoelectric Energy Harvester Model"  has been accepted and presented at the 9th Vienna International Conference on Mathematical Modeling.

In this work, we introduced an alternative approach, implicit Schur complement transformation, for efficient one-sided reduction of the second order piezoelectric energy harvester model.

On Feburary 2, 2018, EU-MORNET WORKSHOP: MOR 4 MECHATRONICS has been successfully held in Jade University of Applied Sciences in Wilhelmshaven. We aim to bring together the European theorist and practitioners working in the area of Model Order Reduction (MOR). 

During the workshop, the invited speakers shared their recent reseach results in the field of MOR and the applications of MOR theory in real-world mechatronics industry. A brain storm about the future of the MOR was given.

(In the photo: President of Jade University of Applied Sciences, Prof. Dr. Manfred Weisensee; Organizer, Prof. Dr. Tamara Bechtold; Invited speaker, Prof. Dr. Wil Schilders.)

Paper "Design of a thermoelectric generator for electrical active implants" has been accepted and presented at the MikroSystemTechnik Kongress 2017 in Munich. This project is a part of the project Collaborative Research Centre 1270 - 'ELAINE', which focuses on providing highly integrated electronic system for novel and electrically stimulating implants. 

In this work, we mainly presented a multiphysical model of a miniaturized thermoelectric generator for electrically active implants, which uses temperature gradients in human tissue. Based on this model, we analyzed the influence of the geometry and material parameters on the thermal and electrical properties and aim for an optimal transducer design. Furthermore, we used mathematical methods of model order reduction to create an accurate compact model, which can be applied in a system-level simulation.

Since October 1, 2017, M.Sc. Siyang Hu has been granted a scholarship by the Ph.D. project (Jade2Pro-program) for the research project 'Design Optimization of Multimodel Microsystems using Topology Optimization and Model Order Reduction' involving the Jade University of Applied Sciences and the University of Rostock.

Paper "Model Order Reduction and System Simulation of a Machine Tool for Real-Time Compensation of Thermally Induced Deformations" has been accepted and presented at the IEEE International Conference on Advanced Intelligent Mechatronics 2017 in Munich.

This work presented the application of mathematical methods of model order reduction for automatic generation of highly accurate and compact models of strongly coupled thermo-mechanical machine tool model. In the further step, the reduced model was imported into the system-level simulation software. Based on the accurate reduced order model, a cascade controller was implemented to monitor and compensate the thermally induced deformations of a machine tool.

M.Sc. Chengdong Yuan  joined the research group "Modeling and Simulation of Mechatronic Systems" in Jade University of Applied Sciences. He was supported by the Jade2Pro-program since April 1, 2017. 

His research topic is  "Parametric Model Order Reduction of Miniaturized Energy Harvester Modules" , which is focused on providing efficient simulation models for the design optimization of energy harvest modules under the guidance of Prof. Dr. -Ing Tamara Bechtold in Jade University of Applied Sciences. This research project is also under the guidance of Prof. Dr. -Ing Dennis Hohlfeld in University of Rostock.