Dynamic model of an RM type ferrite core to simulate the effects of saturation and power losses via 2D Finite Elements in the time domain

2010 ◽  
Author(s):  
R. A. Salas ◽  
J. Pleite
Keyword(s):  
Finite Elements ◽  
Dynamic Model ◽  
Time Domain ◽  
Power Losses ◽  
Ferrite Core ◽  
The Time Domain

scholarly journals Instrumentation for mechanical vibrations analysis in the time domain and frequency domain using the Arduino platform

2016 ◽  
Vol 38 (1) ◽  
Author(s):  
Marcus Varanis ◽  
Anderson Langone Silva ◽  
Pedro Henrique Ayres Brunetto ◽  
Rafael Ferreira Gregolin
Keyword(s):  
Signal Processing ◽  
Finite Elements ◽  
Time Domain ◽  
Good Accuracy ◽  
Low Cost ◽  
Analytical Models ◽  
Experimental Setup ◽  
Mechanical Vibrations ◽  
Python Language ◽  
The Time Domain

In this paper, we use the Arduino platform together with sensors as accelerometer, gyroscope and ultrasound, to measure vibrations in mechanical systems. The main objective is to assemble a signals acquisition system easy to handle, of low cost and good accuracy for teaching purposes. It is also used the Python language and its numerical libraries for signal processing. This paper proposes the study of vibrations of a beam, which is measured by position, velocity and acceleration. An experimental setup was implemented. The results obtained are compared with analytical models and computer simulations using finite elements. The results are in agreement with the literature.

scholarly journals Design and Comparison of the Performance of 12-Pulse Rectifiers for Aerospace Applications

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6312
Author(s):  
Fabio Corti ◽  
Abdelazeem Hassan Shehata ◽  
Antonino Laudani ◽  
Ermanno Cardelli
Keyword(s):  
Time Domain ◽  
Pulse Transformer ◽  
Power Losses ◽  
Loss Analysis ◽  
Aerospace Applications ◽  
Magnetic Components ◽  
Power Switches ◽  
System Input ◽  
The Time Domain ◽  
Copper Losses

In this paper, a conventional 12-pulse transformer unit (CTU) and an autotransformer 12-pulse transformer unit (ATU) are compared in the view of the RTCA DO-160 standard for aircraft applications. The design of the magnetic components is proposed via a coupled FEM-circuital analysis in the time domain for an 800 Hz/2 kW system. Input AC distortion, power factor, and output DC ripple are evaluated through simulations. An accurate power loss analysis is carried out, taking into account copper losses, magnetic losses, and power losses due to power switches. The reduction in the size and weight of the ATU with respect to the CTU solution is discussed, including the need for filtering systems and the standard requirements.

Vibration Analysis and Optimization of Wobble Plate Engine

2012 ◽  
Vol 479-481 ◽  
pp. 2267-2270
Author(s):  
Jing Jin ◽  
Zhen Shan Zhang ◽  
Xin Xiong
Keyword(s):  
Dynamic Model ◽  
Time Domain ◽  
Vibration Analysis ◽  
System Response ◽  
Frequency Range ◽  
Flexible System ◽  
Engine Vibration ◽  
Adams Software ◽  
The Time Domain ◽  
Rubber Isolator

The rigid-flexible system dynamic model of wobble plate engine was created by BUSH element and so on in ADAMS software. And stiffness optimized calculation of engine rubber isolator ring and spring was done by ADAMS optimized module. By comparing the time domain and frequency domain vibration response before optimization and after optimization, the feasibility of optimized method for decreasing engine vibration and changing system response frequency range was verified. This method could provide important reference for vibration dynamic model creating of engine or analogous mechanical system. Its conclusions also could provide reference for decreasing vibration study.

Transfer Function Development and Dynamic Analysis of a Heat Pipe Cooled Reactor

2021 ◽  
Author(s):  
Songmao Pu ◽  
Peiwei Sun ◽  
Xinyu Wei
Keyword(s):  
Transfer Function ◽  
Dynamic Analysis ◽  
Heat Pipe ◽  
Frequency Domain ◽  
Dynamic Model ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Reactor Power ◽  
The Time Domain

Abstract The heat pipe cooled reactor adopts the solid-state reactor design concept and the heat is passively transferred out of the core through heat pipes. It is characterized by high inherent safety and simple operation and has broad application prospects in deep space exploration and propulsion, sea submarine navigation and exploration. The design of heat pipe cooled reactor is unique, and its dynamics are different from traditional water-cooled reactors. Therefore, it is necessary to develop its dynamic model and perform dynamic analysis, and in this paper, the study object of the heat pipe cooled reactor is the 100kW nuclear silent thermoelectric reactor (NUSTER-100). A nonlinear dynamic model is derived from the conservation equations of mass, energy and momentum. Point reactor kinetics equations are adopted. The linear dynamic model is constructed by linearization of the nonlinear model based on the disturbance theory and the transfer function is further derived applying Laplace transform. Both models including the nonlinear model and transfer function model are established on the MATLAB & Simulink simulation platform. Dynamic characteristic analysis contains time domain analysis and frequency domain analysis. For the time domain analysis, by introducing a variety of boundary condition disturbances, the results were compared with those from transfer function. The results are consistent and can correctly reflect the dynamic characteristics of the heat pipe cooled reactor. Therefore, the transfer function model can be applied to the subsequent design of the heat pipe cooled reactor power control system. For the dynamic analysis, it is divided into time domain and frequency domain. The time domain is to observe the change of core power and sodium temperature by introducing reactivity disturbance. For the frequency domain, after drawing the Bode plot of the transfer function, the system’s characteristics at different frequencies are analyzed. In addition, it can provide a theoretical basis for the design of the heat pipe cooled reactor power control system.

Apodisation in the time domain

1992 ◽  
Vol 2 (4) ◽  
pp. 615-620
Author(s):  
G. W. Series
Keyword(s):  
Time Domain ◽  
The Time Domain
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