High-frequency response of aD-fiber antenna using finite-element analysis intended for radio-over-fiber applications

Abstract The use of finite element analysis (FEA) in high frequency (20–40 kHz), high power ultrasonics to date has been limited. Of paramount importance to the performance of ultrasonic tooling (horns) is the accurate identification of pertinent modeshapes and frequencies. Ideally, the ultrasonic horn will vibrate in a purely axial mode with a uniform amplitude of vibration. However, spurious resonances can couple with this fundamental resonance and alter the axial vibration. This effect becomes more pronounced for ultrasonic tools with larger cross-sections. The current study examines a 4.5″ × 6″ cross-section titanium horn which is designed to resonate axially at 20 kHz. Modeshapes and frequencies from 17–23 kHz are examined experimentally and using finite element analysis. The effect of design variables — slot length, slot width, and number of slots — on modeshapes and frequency spacing is shown. An optimum configuration based on the finite element results is prescribed. The computed results are compared with actual prototype data. Excellent correlation between analytical and experimental data is found.

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Improved High-Frequency Modeling of PMSM Using 3-D Finite Element Analysis

2019 International Power System Conference (PSC) ◽

10.1109/psc49016.2019.9081510 ◽

2019 ◽

Author(s):

Alireza Rahimi ◽

Khalil Kanzi

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

High Frequency ◽

Element Analysis

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Finite-element-analysis of the mechanical behavior of high-frequency litz wire in flat coil winding

Production Engineering ◽

10.1007/s11740-020-00996-3 ◽

2020 ◽

Vol 14 (5-6) ◽

pp. 555-567

Author(s):

Michael Weigelt ◽

Cornelius Thoma ◽

Erdong Zheng ◽

Joerg Franke

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Mechanical Behavior ◽

High Frequency ◽

Common Property ◽

Computational Effort ◽

Bending Stress ◽

Element Analysis ◽

Technical Requirements ◽

Coil Winding

AbstractNumerous applications of daily life use flat coils, e.g. in the automotive area, in solar technology and in modern kitchens. One common property that all these applications share, is a flat coil made of high-frequency (HF) litz wires. The coil layout and the properties of the HF litz wire influence the winding process and the efficiency of the application. As a result, the HF litz wire must meet the complex technical requirements of the winding process and of the preferred mechanical, electromagnetic and thermal properties of the HF litz wire itself. Therefore, a reasonable configuration and optimization of HF litz wire has been developed with the help of a finite-element-analysis (FEA). In this work, it is first shown that the mechanical behavior of HF litz wire under tensile and bending stress can be simulated. Since the computational effort for modelling an HF litz wire at the single conductor level is hardly manageable, a suitable modelling strategy is developed and applied using geometric analogous models (GAM). By using such a model, HF litz wires can be designed for the specific application and their behavior in a winding process can be predicted.

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