Experimental research of high frequency standing wave thermoacoustic refrigerator driven by loudspeaker

2012 ◽  
Author(s):  
Zhang Chunping ◽  
Liu Wei ◽  
Yang Zhichun ◽  
Li Zhengyu ◽  
Zhang Xiaoqing ◽  
...  
Keyword(s):  
Standing Wave ◽  
Experimental Research ◽  
High Frequency ◽  
Thermoacoustic Refrigerator

The Effect of Combined Loads on the Destruction of Rocks with a Granular Structure

2021 ◽  
Vol 1022 ◽  
pp. 1-6
Author(s):  
Victoria S. Romanova ◽  
Viktor V. Gabov
Keyword(s):  
Ultimate Strength ◽  
Experimental Research ◽  
High Frequency ◽  
Granular Structure ◽  
Common Method ◽  
Crushed Material ◽  
Combined Loads ◽  
Rock Disintegration ◽  
The Common ◽  
Destruction Of Rocks

The article addresses the features of rock disintegration based on the principles of selective and preferential destruction in high-frequency cone vibratory crushers with a free-turning inner cone. Based on the common method for determining the ultimate strength of rocks, a method for investigating the process of ore destruction under repeated and versatile influences has been proposed depending on the structure of the crushed material. The results of an experimental research of the destruction of rock samples on a press with limited force are given.

scholarly journals Обнаружение высокочастотных альфвеновских колебаний в омических разрядах сферического токамака Глобус-М2

2021 ◽  
Vol 47 (12) ◽  
pp. 17
Author(s):  
И.М. Балаченков ◽  
Ю.В. Петров ◽  
В.К. Гусев ◽  
Н.Н. Бахарев ◽  
В.И. Варфоломеев ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Standing Wave ◽  
High Frequency ◽  
Low Density ◽  
Frequency Range ◽  
High Frequency Oscillations ◽  
Model Predictions ◽  
Mode Excitation ◽  
Order Of Magnitude ◽  
Frequency Chirping

In Globus-M2 ohmic discharges with low density, by means of Mirnov coils array, magnetic field oscillations with frequencies in 1 MHz range were detected. Frequency range of these oscillations significantly exceed the range of TAE and RSAE frequencies, which were previously observed on Globus-M and Globus-M2 tokamaks, and their amplitude, contrary, turned out to be up to an order of magnitude lower. It was found that high frequency oscillations are interrelated with suprathermal electron fraction. At the same time the observed instability seems to have Alfvenic nature, since its frequency correlates well with Alfven frequency scaling. It was also found that magnetic perturbation always forms standing wave with predominantly low toroidal wavenumbers, including n = 0 structure, which makes gap (e.g. TAE) mode excitation impossible. Frequency chirping during single bursts with δω ~ √t is consistent with hole-clump model predictions.

Suppression of harmonics in a high frequency standing‐wave thermoacoustic engine

2008 ◽  
Vol 123 (5) ◽  
pp. 3543-3543
Author(s):  
Wei Dai ◽  
Bo Yu ◽  
Guoyao Yu ◽  
Ercang Luo
Keyword(s):  
Standing Wave ◽  
High Frequency ◽  
Thermoacoustic Engine

Jitter Transmission Analysis and Experimental Research for Frame Structure in the Median and High Frequency Regions

2012 ◽  
Vol 271-272 ◽  
pp. 981-985
Author(s):  
You Yi Wang ◽  
Yang Zhao ◽  
Wen Lai Ma
Keyword(s):  
Dynamic Response ◽  
Frequency Response ◽  
Dynamic Model ◽  
Experimental Research ◽  
High Frequency ◽  
Low Frequency ◽  
Frame Structure ◽  
Wave Method ◽  
Simulation Results ◽  
Theoretical Results

Frame structure is widely used in practical projects. For jitter of the frame structure excited by median and high frequency disturbances, firstly, the dynamic model of thin plate substructure is built by wave method, and then the dynamic model of frame structure is established by combining wave method and substructure technique. At last, the accurate dynamic response was obtained. The simulation of dynamic characteristic is made, and simulation results are compared with FEM results. On this basis, modal experiment and frequency response experiment is done to verify theoretical results. In comparison to FEM, the results by wave method are accurate in low frequency regions, and the results are more accurate in the median and high frequency regions. The experiment proves wave method is correct and effective for jitter transmission analysis of frame structure in the median and high frequency regions.

Sign in / Sign up

Export Citation Format

Share Document