Modeling and linear analysis of sound generation mechanism in sonic soot blowers

2019 ◽  
Vol 25 (17) ◽  
pp. 2305-2315
Author(s):  
A. Najafi ◽  
M. Asayesh ◽  
A. Siami
Keyword(s):  
Sound Wave ◽  
Parametric Study ◽  
Low Frequency ◽  
Linear Analysis ◽  
Generation Mechanism ◽  
Frequency Content ◽  
Sound Generation ◽  
Governing Equations ◽  
High Level ◽  
Frequency Sound Wave

Sonic soot blowers (SSBs) are nondestructive tools to prevent ashes and particle build-up on the surfaces of boilers or other similar instruments. For higher performance, sonic soot cleaners should generate a high level-low frequency sound wave. In this article, the sound generation mechanism in these tools has been modeled. Firstly, the governing equations of the diaphragm and the horn and coupling between them are derived. By linearization, a parametric study is performed to find the optimum design points. Based on the eigenvalue analysis, it is shown that the sound generation in sonic soot cleaners is due to instability of the interaction between the diaphragm and the horn. Moreover, it is found that the sound wave frequency is approximately equal to the lowest fundamental frequency of the horn or diaphragm. Finally, the frequency content of an SSB voice is investigated.

Cloud and precipitation interference by strong low-frequency sound wave

2020 ◽  
Author(s):  
JiaHua Wei ◽  
Jun Qiu ◽  
TieJian Li ◽  
YueFei Huang ◽  
Zhen Qiao ◽  
...  
Keyword(s):  
Sound Wave ◽  
Low Frequency ◽  
Frequency Sound ◽  
Frequency Sound Wave

Relating Turbulence to Wind Turbine Blade Loads: Parametric Study with Multiple Regression Analysis

1999 ◽  
Vol 121 (3) ◽  
pp. 156-161 ◽  
Author(s):  
T. Kashef ◽  
S. R. Winterstein
Keyword(s):  
Regression Analysis ◽  
Wind Turbine ◽  
Parametric Study ◽  
Turbine Blades ◽  
Low Frequency ◽  
Frequency Content ◽  
Wind Turbine Blades ◽  
Systematic Method ◽  
Highly Correlated ◽  
Blade Loads

Different wind parameters are studied to find a set that is most useful in estimating fatigue loads on wind turbine blades. The histograms of rainflow counted stress ranges are summarized through their first three statistical moments and regression analysis is used to estimate these moments in various wind conditions. A systematic method of comparing the ability of different wind parameters to estimate the moments is described and results are shown for flapwise loads on three HAWTs. In the case of two of these turbines, the stress ranges are shown to be highly correlated with a turbulence measure obtained by removing a portion of the low-frequency content of the wind.

Low-frequency sound wave parameter measurement in gravels

2010 ◽  
Vol 71 (1) ◽  
pp. 45-51 ◽  
Author(s):  
George W. Swenson ◽  
Michael J. White ◽  
Michael L. Oelze
Keyword(s):  
Sound Wave ◽  
Low Frequency ◽  
Parameter Measurement ◽  
Wave Parameter ◽  
Frequency Sound ◽  
Frequency Sound Wave

Mean field of a low-frequency sound wave propagating in a fluctuating ocean

2006 ◽  
Vol 119 (4) ◽  
pp. 2101-2105 ◽  
Author(s):  
Alexander G. Voronovich ◽  
Vladimir E. Ostashev
Keyword(s):  
Sound Wave ◽  
Mean Field ◽  
Low Frequency ◽  
Frequency Sound ◽  
Frequency Sound Wave

scholarly journals Planar acoustic notch filter for low frequency sound wave suppression

2018 ◽  
Vol 11 ◽  
pp. 259-266 ◽  
Author(s):  
Ming Yuan ◽  
Fan Yang ◽  
Jun Luo ◽  
Ziping Cao
Keyword(s):  
Sound Wave ◽  
Low Frequency ◽  
Notch Filter ◽  
Frequency Sound ◽  
Frequency Sound Wave

Simulation of Engine Vibration on Nonlinear Hydraulic Engine Mounts

2005 ◽  
Author(s):  
A. R. Ohadi ◽  
G. Maghsoodi
Keyword(s):  
Equations Of Motion ◽  
Low Frequency ◽  
Governing Equations ◽  
Engine Mounts ◽  
Engine Vibration ◽  
Engine Mount ◽  
Rotational Motions ◽  
The Time Domain ◽  
Nonlinear Equations Of Motion ◽  
Four Cylinders

In this paper, vibration behavior of engine on nonlinear hydraulic engine mount including inertia track and decoupler is studied. In this regard, after introducing the nonlinear factors of this mount (i.e. inertia and decoupler resistances in turbulent region), the vibration governing equations of engine on one hydraulic engine mount are solved and the effect of nonlinearity is investigated. In order to have a comparison between rubber and hydraulic engine mounts, a 6 degree of freedom four cylinders V-shaped engine under inertia and balancing masses forces and torques is considered. By solving the time domain nonlinear equations of motion of engine on three inclined mounts, translational and rotational motions of engines body are obtained for different engine speeds. Transmitted base forces are also determined for both types of engine mount. Comparison of rubber and hydraulic mounts indicates the efficiency of hydraulic one in low frequency region.

scholarly journals Spiral Sound Wave Transducer Based on the Longitudinal Vibration

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3674 ◽  
Author(s):  
Wei Lu ◽  
Yu Lan ◽  
Rongzhen Guo ◽  
Qicheng Zhang ◽  
Shichang Li ◽  
...  
Keyword(s):  
Sound Wave ◽  
Longitudinal Vibration ◽  
Three Dimensional ◽  
Low Frequency ◽  
Sound Field ◽  
Field Measurements ◽  
Sound Waves ◽  
Underwater Sound ◽  
Three Dimensional Finite Element ◽  
Wave Transducer

A spiral sound wave transducer comprised of longitudinal vibrating elements has been proposed. This transducer was made from eight uniform radial distributed longitudinal vibrating elements, which could effectively generate low frequency underwater acoustic spiral waves. We discuss the production theory of spiral sound waves, which could be synthesized by two orthogonal acoustic dipoles with a phase difference of 90 degrees. The excitation voltage distribution of the transducer for emitting a spiral sound wave and the measurement method for the transducer is given. Three-dimensional finite element modeling (FEM)of the transducer was established for simulating the vibration modes and the acoustic characteristics of the transducers. Further, we fabricated a spiral sound wave transducer based on our design and simulations. It was found that the resonance frequency of the transducer was 10.8 kHz and that the transmitting voltage resonance was 140.5 dB. The underwater sound field measurements demonstrate that our designed transducer based on the longitudinal elements could successfully generate spiral sound waves.

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