Analysis of Influence of Different Propagation Media on Motor Vibration and Noise

2021 ◽  
pp. 647-657
Author(s):  
Ningning Yang ◽  
Jinhua Chen ◽  
Yunpeng Gao ◽  
Chi Zhang ◽  
Guofu Li
Keyword(s):  
Motor Vibration ◽  
Propagation Media

scholarly journals TDOA-based microwave imaging algorithm for real-time microwave ablation monitoring

2017 ◽  
Vol 10 (2) ◽  
pp. 169-178 ◽  
Author(s):  
Shouhei Kidera ◽  
Luz Maria Neira ◽  
Barry D. Van Veen ◽  
Susan C. Hagness
Keyword(s):  
Real Time ◽  
Microwave Ablation ◽  
Microwave Imaging ◽  
Ablation Zone ◽  
Real Time Monitoring ◽  
Imaging Algorithm ◽  
Array Measurements ◽  
Time Operation ◽  
Real Time Operation ◽  
Propagation Media

Microwave ablation is widely recognized as a promising minimally invasive tool for treating cancer. Real-time monitoring of the dimensions of the ablation zone is indispensable for ensuring an effective and safe treatment. In this paper, we propose a microwave imaging algorithm for monitoring the evolution of the ablation zone. Our proposed algorithm determines the boundary of the ablation zone by exploiting the time difference of arrival (TDOA) between signals received before and during the ablation at external antennas surrounding the tissue, using the interstitial ablation antenna as the transmitter. A significant advantage of this method is that it requires few assumptions about the dielectric properties of the propagation media. Also the simplicity of the signal processing, wherein the TDOA is determined from a cross-correlation calculation, allows real-time monitoring and provides robust performance in the presence of noise. We investigate the performance of this approach for the application of breast tumor ablation. We use simulated array measurements obtained from finite-difference time-domain simulations of magnetic resonance imaging-derived numerical breast phantoms. The results demonstrate that our proposed method offers the potential to achieve millimeter-order accuracy and real-time operation in estimating the boundary of the ablation zone in heterogeneous and dispersive breast tissue.

Robustness of chaos to multipath propagation media

2018 ◽  
pp. 423-437 ◽  
Author(s):  
Hai-Peng Ren ◽  
Murilo S. Baptista ◽  
Celso Grebogi
Keyword(s):  
Multipath Propagation ◽  
Propagation Media

The Numerical Simulation and Finite-Element Analysis of the Motor Vibration Problem Based on the Base Anchor Softening Layer

2013 ◽  
Vol 815 ◽  
pp. 860-867
Author(s):  
Yu Gu ◽  
Shao Xiong Li ◽  
Rui Li ◽  
Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Exciting Force ◽  
Element Analysis ◽  
Comparison Results ◽  
Inherent Frequency ◽  
Motor Model ◽  
Motor Vibration ◽  
Important Significance

Vibration results from situation when the inherent frequency close to the external exciting force during the operation of the motor, so accurate and effective calculation of the natural frequency of the motor has an important significance to damping noise. By numerical simulation model and the ANSYS finite element modal, the inherent frequencies were got of the motor and comparison results verify the effectiveness of the motor model. The effect of the modulus of elasticity of the softening layer between the motor and the ground to the inherent frequency was researched intensively, and puts forward related suggestions.

EFFECT OF WOUNDING AND PROPAGATION MEDIA ON THE ROOTING OF TWO VARIETIES OF CAMELLIA JAPONICA L.

1989 ◽  
pp. 167-170
Author(s):  
E. González ◽  
J.L.G. Mantilla ◽  
T. Díaz ◽  
I. Iglesias
Keyword(s):  
Camellia Japonica ◽  
Propagation Media

An Intelligent Control System for Edge Position Deviation of Narrow Fabrics

2012 ◽  
Vol 461 ◽  
pp. 606-610
Author(s):  
Wei Ping Luo
Keyword(s):  
Control System ◽  
Intelligent Control ◽  
Dynamic Performance ◽  
Fast Response ◽  
Shape Deviation ◽  
Intelligent Control System ◽  
Roll System ◽  
Fabric Production ◽  
System Deviation ◽  
Motor Vibration

Focused on the S-shape deviation problem in the narrow fabric production process, this paper introduces an intelligent control system with DC servomotor as the actuator for an intermediate guide roll system. To improve the dynamic performance of the deviation control system and solve the motor vibration problem, the deviation control algorithm is proposed, which is related to intelligent PD feedback control combined with the feed-forward regulation for the system deviation, and its MatLab simulation results show its good performances and advantages. Furthermore, a technical approach for the deviation controller using DSP processor chip TMS320F2812 is presented. The system is applied in the intermediate guide roll system, and the application result indicates that the system is characterized by fast response and steady operation and it is a good solution for the motor vibration.

IEEE 841 motor vibration

2005 ◽  
Vol 11 (6) ◽  
pp. 32-37 ◽  
Author(s):  
D. Bogh ◽  
J. Crowell ◽  
R. Amstutz
Keyword(s):  
Motor Vibration
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