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A new co-simulation method is proposed for active devices and electromagnetic resonant circuits at microwave frequency range. For the measured and extracted device parameters, three steps of equivalent circuit models are processed of the general, simplified, and EM RLC models. To overcome the limited lumped element simulation in an electromagnetic simulator, the simplified equivalent circuit model is established by mathematical computation. The co-simulation procedures are described and experimentally verified for commercial diodes. The application circuit is designed and implemented using the proposed co-simulation method. The experimental results verify that design using the proposed co-simulated method presented excellent agreement for a wideband frequency range of 0-4 GHz, compared with that using a conventional design method. The proposed co-simulation method can be applied to any commercial EM simulation tools without active model error.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10609346 | PMC |
http://dx.doi.org/10.3390/mi14101847 | DOI Listing |
Micromachines (Basel)
June 2025
Key Laboratory of Civil Aircraft Airworthiness Technology, Civil Aviation University of China, Tianjin 300300, China.
This paper presents an improved NSGA-II algorithm for the multi-objective optimization of irregular polygon patch antennas (IPPAs), improving convergence efficiency and Pareto front quality. The algorithm integrates adaptive mechanisms that dynamically adjust crossover and mutation rates based on generational progression, accelerating convergence while preserving solution diversity. Furthermore, a simulated annealing-inspired acceptance criterion is embedded during offspring generation to mitigate local optima trapping and enhance evolutionary robustness.
View Article and Find Full Text PDFSci Rep
July 2025
Liugong Changzhou Machinery co., LTD, Changzhou, 213001, China.
Hydrostatic bulldozers, mainly medium- and low-horsepower machines, are widely used in engineering, and improving their fuel economy is crucial under the global push for energy conservation. To address the poor fuel economy of the bulldozer during repetitive, precision tasks or idle transfers, a performance optimization control strategy (POCS) based on constant speed cruise(CSC) is designed. This strategy achieves optimal overall machine efficiency under cruise control by adjusting the engine throttle and the displacement of the hydraulic pump and motor.
View Article and Find Full Text PDFPLoS One
July 2025
College of Aeronautical Engineering, Civil Aviation University of China, Tianjin, China.
The convergence of algorithms is an unavoidable problem when using global optimization algorithms to optimize acoustic properties of metamaterials. The quality of optimization of local optimization algorithms is often limited by the initial data. Moreover, the influence of structural parameters on the performance is difficult to be reflected in the optimization process of traditional algorithms.
View Article and Find Full Text PDFCardiovasc Eng Technol
June 2025
Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, 14853, USA.
Purpose: Ventricular assist devices (VADs) are most often computationally evaluated as isolated devices subjected to idealized steady-state blood flow conditions. In clinical practice, these devices are connected to, or within, diseased pulsatile ventricles of the heart, which can dramatically affect the hemodynamics, hence hemocompatibility-related adverse events such as hemolysis, bleeding, and thrombosis. Therefore, improved simulations are needed to more realistically represent the coupling of devices to the assisted ventricle.
View Article and Find Full Text PDFThe global incidence of traffic accidents caused by vehicle rollovers has exhibited a persistent upward trajectory in recent years. This paper proposes a novel rollover prevention control method incorporating time-delay compensation to address inherent latency issues in anti-rollover control systems (ARCS). First, structural parameters and dynamic theory establish a three-degree-of-freedom (3-DOF) dynamics model for a sport utility vehicle (SUV).
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