High-Frequency Impulse Modeling and Longitudinal Insulation Analysis of Bifilar Superconducting Coil

2021 ◽  
Vol 31 (1) ◽  
pp. 1-8
Author(s):  
Jing Zhang ◽  
Shaotao Dai ◽  
Tao Ma ◽  
Ying Xu ◽  
Xufeng Yan
Keyword(s):  
High Frequency ◽  
Superconducting Coil ◽  
Frequency Impulse

Applied Research on Segmented-Hilbert-Huang Transform Algorithm in Fault Feature Extraction of Main Reducer

2013 ◽  
Vol 823 ◽  
pp. 417-421 ◽  
Author(s):  
Feng Yun Huang ◽  
Huan Huan Sun ◽  
Hao Pan ◽  
Wei Ru Zhang
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Vibration Signal ◽  
Model Decomposition ◽  
Frequency Dictionary ◽  
Hilbert Huang Transform ◽  
Time Frequency ◽  
Frequency Representation ◽  
Scale Characteristics ◽  
Frequency Impulse

For the multi-time scale characteristics of vibration signal, a composite multi-frequency dictionary combining the low-frequency Fourier dictionary and the high-frequency impulse time-frequency dictionary is constituted, to decompose multi-component vibration signal into the combination of several one-component signals. The use of empirical model decomposition (EDM) in high-frequency impulse Component signal including feature information is to realize segmented Hilbert-Huang transform of signal and to acquire the time-frequency representation of every one-component signal, which is the process of fault information extraction of vibration signal. The application of the method in main reducer fault diagnosis verifies the engineering practicability and validity of the new algorithm.

In Situ Acoustic Monitoring of Thermal Spray Process Using High-Frequency Impulse Measurements

2017 ◽  
Vol 27 (1-2) ◽  
pp. 50-58 ◽  
Author(s):  
Wolfgang Tillmann ◽  
Frank Walther ◽  
Weifeng Luo ◽  
Matthias Haack ◽  
Jens Nellesen ◽  
...  
Keyword(s):  
Thermal Spray ◽  
High Frequency ◽  
Acoustic Monitoring ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Frequency Impulse

Investigation of Archeological Caves in Israel Using High-Frequency Impulse Electric Prospecting

2018 ◽  
Vol 482 (2) ◽  
pp. 1320-1323
Author(s):  
A. V. Nikolaev ◽  
D. S. Gorkin ◽  
L. V. Eppelbaum ◽  
N. Arnon ◽  
P. G. Manukov ◽  
...  
Keyword(s):  
High Frequency ◽  
Frequency Impulse ◽  
Electric Prospecting

scholarly journals High-Frequency Impulse Therapy for Treatment of Chronic Back Pain: A Multicenter Randomized Controlled Pilot Study

2021 ◽  
Vol Volume 14 ◽  
pp. 2991-2999
Author(s):  
Kasra Amirdelfan ◽  
Mindy Hong ◽  
Bobby Tay ◽  
Surekha Reddy ◽  
Vinay Reddy ◽  
...  
Keyword(s):  
Back Pain ◽  
Pilot Study ◽  
High Frequency ◽  
Chronic Back Pain ◽  
Randomized Controlled ◽  
Frequency Impulse

Effect of Running Speed and Aerobic Dance Jump Height on Vertical Ground Reaction Forces

1994 ◽  
Vol 10 (1) ◽  
pp. 14-27 ◽  
Author(s):  
Mark D. Ricard ◽  
Steve Veatch
Keyword(s):  
High Frequency ◽  
Loading Rate ◽  
Impact Force ◽  
Reaction Force ◽  
Running Speed ◽  
Dance Movement ◽  
Aerobic Dance ◽  
Impact Forces ◽  
Peak Impact Force ◽  
Frequency Impulse

Aerobic dance movement sequences are similar to running in repetitive frequency. The purpose of this study was to compare ground reaction force variables in aerobic dance and running. Five female subjects performed 10 trials of five running speeds (2.4–4.0 ± 0.4 m/s) and five heights (0–8 ± 0.2 cm) of front knee lift aerobic dance steps on an AMTI force plate (1000 Hz). First peak impact force, peak loading rate, high-frequency impulse, and 50-ms impulse increased with increased running speed and jumping height. Time to first peak impact force decreased as running speed and jumping height increased. Although first peak impact forces resulting from airborne aerobic dance movements (1.96–2.62 BW) were greater than first peak impact forces in running (1.30–2.01 BW), running compared to aerobic dance resulted in shorter time to first peak impact force and higher values for loading rate, high-frequency impulse, and 50-ms impulse. When compared to aerobic dance, running exhibits smaller peak vertical forces but higher loading rates and vertical impulses.

scholarly journals High frequency impulse ground penetrating radar application in assessment of interlayer connections

2018 ◽  
Vol 163 ◽  
pp. 02005 ◽  
Author(s):  
Jacek Sudyka ◽  
Lech Krysiński ◽  
Adam Zofka ◽  
Marek Pszczoła ◽  
Piotr Jaskuła
Keyword(s):  
Ground Penetrating Radar ◽  
High Frequency ◽  
Large Scale ◽  
Measuring System ◽  
Electromagnetic Properties ◽  
Electromagnetic Responses ◽  
Pavement Structures ◽  
Zero Offset ◽  
Ground Penetrating ◽  
Frequency Impulse

Ground Penetrating Radar (GPR) technique is commonly used in the nondestructive evaluation of pavement structures. In particular, this method is used to estimate thicknesses of pavement layers as well as it can be utilized in advanced studies of pavement structures. The device presented in this paper comprise the high frequency impulse antennas that allow for investigating the interlayer zones in terms of their electromagnetic properties (e.g. dielectric constant). In some cases these electromagnetic responses can be suitable in the assessment of layer bonding in the pavement structure. This paper discusses the assessment of the quality of asphalt pavement interlayer bonding with the use of high frequency GPR techniques. The preliminary laboratory measurements were performed using an impulse antenna in the zero-offset configuration combined with the large-scale models simulating an idealized horizontal delamination. These measurements allowed to estimate the antenna sensitivity to detect interlayer connection under dry and wet conditions. Analysis of collected results led to formulating practical conclusions regarding critical limitations of the measuring system and adequate methods of signal processing and interpretation. The field investigations consisted of the GPR measurements along selected road sections and collection of the core samples at the locations associated with the specific reflexes. Inspection of the cores provided some real insights into the structure of different delaminations associated with characteristic reflexes. Analysis showed the reflection properties are able to expresses some important features of the interlayer zone, such as delaminations, presence of alien material at the interface, insufficient compaction occurring at the base of layer, and water penetration.

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