Enabling_Iot_with_Electromagtic_Simulation MODSIM 3DXCONFERENCE
I am pleased to invite you to Han Shan's presentation on the Global 3DEXPERIENCE Modeling and Simulation Virtual Conference on November 17th & 18th.
Acknowledgement
This research work in this presentation was supported by Nanyang Technological University (NTU). The content is solely the responsibility of the author and doesn’t represent the official views of NTU. I would like to express my thanks to Asst Prof Li King Ho with school of Mechanical and aerospace Engineering, Nanyang Technological University for his patient guidance and support on this work. I would also like to thank our industry consultant Prof Tse Man Siu for his help in developing the ideas and analyzing the test results. Last but not least, thanks to the software of CST MICROWAVE STUDIO Suite to provide this excellent simulation platform for designing, analyzing and optimizing the EMP system.
Challenge
The aim of the research work is to design an Electro Magnetic Pulse (EMP) Generator activated by photoconductive semiconductor switches (PCSS). To identity the important parameters affecting the performance of the EMP Generator design and to achieve the desired objectives, effect of structure dimensions of initial design has to be studied systematically with intensive simulation and analysis work. Therefore, it is necessary to develop an efficient way of modeling and simulation the EMP system. In addition, PCSS is an important design parameter that affect the system’s performance. To ensure the accuracy of the simulation results, PCSS switching profile modeling becomes the main concern and it must match the characteristic of the PCSS device obtained from Sentaurus Device Transient Simulation in terms of voltage drop, holding voltage, rising time, duration, and etc.
Solution
The team developed a EMP generator that is modelled and simulated with CST MICROWAVE STUDIO Suite from Dassault Systèmes’ brand, SIMULIA. The CST MICROWAVE STUDIO provided the platform to analyses E-field and provided directivity analyses such as setting the far filed probes and 3D frequency monitoring. In the CST simulation, EMP is generated with high voltage (HV) being applied to the various electrodes with PCSS being initiated at the same time. PCSS device is modeled as a discrete excitation voltage source with a time dependent resistance in CST. This is analogous to importing the PCSS device into CST with variable conductivity model. With PCSS acting as the triggering switch, the EMP generator’s DC port is modeled with HV input to the structure in simulation. The solution has allowed us to develop the EMP generator, DC port HV timing profile with PCSS switching profile (PCSS variable conductivity model) to complement and expand the software’s native capabilities.
Benefit
With CST MICROWAVE STUDIO, performance of EMP generator can be optimized. Moreover, the potential compliance issues can be identified and mitigated early in the design process. Hence, the number of physical prototypes required for experimentation is drastically reduced. The capabilities of setting local meshing in different portions of the structure and importing existing excel form for the conductivity data filling allows the CST simulation to work efficiently and cut down in computational time. The modeling and simulation work help us to understand the fundamental principle of the EMP generator under the PCSS initiation concept and optimization of the system design. Testing performed with prototype matched with the simulations results.
Presentation Replay
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