Comparative sensitivity of pressure gradient receivers of force and inertial types to sound pressure in plane wave

2015 ◽  
Author(s):  
Vladimir I. Korenbaum ◽  
Sergei V. Gorovoy ◽  
Alexandr A. Tagiltcev ◽  
Anatoly E. Kostiv
Keyword(s):  
Plane Wave ◽  
Pressure Gradient ◽  
Sound Pressure ◽  
Comparative Sensitivity ◽  
Inertial Types

Comparative sensitivity of pressure gradient receivers of force and inertial types to sound pressure in plane wave

2015 ◽  
Vol 137 (4) ◽  
pp. 2242-2242
Author(s):  
Vladimir Korenbaum ◽  
Sergei Gorovoy ◽  
Alexandr Tagiltcev ◽  
Anatoly Kostiv
Keyword(s):  
Plane Wave ◽  
Pressure Gradient ◽  
Sound Pressure ◽  
Comparative Sensitivity ◽  
Inertial Types

scholarly journals DEVELOPMENT OF SMALL-SIZE LOW-FREQUENCY PRESSURE GRADIENT SENSORS

2020 ◽  
Author(s):  
В.И. Коренбаум ◽  
С.В. Горовой ◽  
А.А. Тагильцев ◽  
А.Е. Бородин
Keyword(s):  
Pressure Gradient ◽  
Sound Pressure ◽  
Dynamic Range ◽  
Linear Array ◽  
Low Frequency ◽  
Directivity Pattern ◽  
Differential Pressure ◽  
Effective Pressure ◽  
Frequency Range

Проанализированы проблемы создания приемников градиента давления различных типов для использования в низкочастотном диапазоне, определяемые необходимостью достижения достаточной чувствительности к звуковому давлению в плоской волне, коэффициента деления дипольной характеристики направленности не хуже 26 дБ, динамического диапазона не менее 80–100 дБ. Теоретически оценены пределы применимости ПГД 2-гидрофонного (разностного) типов по волновым размерам. Разработаны высоко- эффективные ПГД инерционного и силового типов. Предложено комбинирование ПГД инерционного/силового и 2-гидрофонного типов в линейной антенне. The problems of development of pressure gradient sensors of various types for usage in low-frequency range are analyzed, which are connected to a necessity to provide acceptable sensitivity to sound pressure in a flat wave, minima of the dipole directivity pattern being nor less 26 dB, dynamic range being nor less 80–100 dB. The wavelength limits of acceptability of 2-hydrophone (differential) pressure gradient sensors are theoretically predicted. High effective pressure gradient sensors of inertial and force types are designed. It is suggested to combine a pressure gradient sensor of inertial or force type with the pressure gradient sensor of 2-hydrophone type in linear array.

Combined sound‐pressure and pressure‐gradient hydrophone design

2000 ◽  
Vol 107 (5) ◽  
pp. 2840-2840
Author(s):  
Boris Aronov ◽  
Lawrence Reinhart ◽  
David A. Brown
Keyword(s):  
Pressure Gradient ◽  
Sound Pressure

A numerical investigation of resonant interactions in adverse-pressure-gradient boundary layers

1999 ◽  
Vol 378 ◽  
pp. 269-289 ◽  
Author(s):  
CHONGHUI LIU ◽  
S. A. MASLOWE
Keyword(s):  
Plane Wave ◽  
Pressure Gradient ◽  
Boundary Layers ◽  
Stokes Equations ◽  
Initial Conditions ◽  
Flow Direction ◽  
Linear Stability Theory ◽  
Preconditioned Conjugate Gradient ◽  
Algebraic Equations ◽  
Oblique Waves

We present direct numerical simulations of the spatial development of normal mode perturbations to boundary layers with Falkner–Skan velocity profiles. Values of the pressure gradient parameter considered range from very small, i.e. nearly flat-plate conditions, to relatively large values corresponding to incipient separation. In almost all cases, we find that the most effective perturbation is one composed of a plane wave and a pair of oblique waves inclined at equal and opposite angles to the primary flow direction. The frequency of the oblique waves is half that of the fundamental plane wave and because the conditions for resonance are satisfied exactly, all modes share a common critical layer, thus facilitating a strong interaction.The oblique waves initially undergo a parametric type of subharmonic resonance, but in accordance with recent analyses of non-equilibrium critical layers, the system subsequently becomes fully coupled. From that point on, the amplification of all modes, including the plane wave, substantially exceeds the predictions of linear stability theory. Good agreement is obtained with the experimental small pressure gradient results of Corke & Gruber (1996). Our growth rates are slightly larger flowing to slight differences in initial conditions (e.g. the angle of inclination of the oblique waves).The spectral element method was used to discretize the Navier–Stokes equations and the preconditioned conjugate gradient method was used to solve the resulting system of algebraic equations. At the inflow boundary, Orr–Sommerfeld modes were employed to provide the initial forcing, whereas the buffer domain technique was used at the outflow boundary to prevent convective wave reflection or upstream propagation of spurious information.

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