Akusticheskij Zhurnal

The current state of the Acoustic Journal Archive is presented with a description of its English-language part. The prospects for the development of the Archive are discussed in connection with the discrepancy between the contents of the journal and its English-language version, “Acoustical Physics”. The “Open Access” trend in access to scientific literature, which has become widespread, is commented on.

A. B. Gorshkov

V. G. Shamaev

Акустический журнал

New Features of the Acoustic Journal Archive Site

声学期刊档案网站的新特性

In work the results of the analysis of experimental data allowing to reveal behavior of parameters of fluctuation of the design at change of amplitude of acoustic pressure with the concept of conductivity of acoustic vibration entered into consideration are provided. The nonlinear behavior of the vibration response of the design of different compartments of the rocket and segments of panels when loading by their field of acoustic pressure is confirmed. The general patterns of nonlinearity are found, in the particular it is shown that conductivity tends to lowering with the growth of acoustic loading close generally to the power function.

P. A. Popov

Tendency of Conductivity of Acoustic Vibration of the Design of Aircraft to Lowering with the Growth of Their Acoustic Loading

飞机设计中声振动导电性随其声载荷增加而降低的趋势

The effect of lateral asymmetry in the radiation pattern of a propeller installed near the wing is studied. Within the framework of a simplified theoretical model of the propeller loading noise and its shielding by a half-plane, as well as using numerical modeling of the interaction of the propeller with a flat finite plate, it is shown that when the propeller and the scattering surface are close to each other, a significant lateral asymmetry of the propeller tonal noise emission in the far field appears. The mechanism of this effect, which accompanies the symmetrical sound directivity of the propeller itself and the symmetry of the scatterer (wing), is associated with the phased summation of the sound field emitted directly by the propeller and the secondary sound field generated on the surface of the wing due to the scattering of disturbances (mainly hydrodynamic) created by the propeller on the leading edge of the wing. Thus, the study demonstrated that the presence of lateral asymmetry in the noise radiation pattern inherent in propeller-driven aircraft is a consequence of the interaction of the propellers and closely spaced wings.

V. F. Kopyev

N. N. Ostrikov

G. A. Faranosov

V. A. Titarev

S. L. Denisov

R. V. Akinshin

On the Mechanism of Lateral Asymmetry of Noise Emission from a Propeller Installed Near a Wing

关于螺旋桨安装在机翼附近时噪声发射横向不对称性的机理

A one-dimensional nonlinear problem of parametric generation of low-frequency radiation is considered in the case of a pulsed high-frequency initial excitation capable of forming shock fronts in the wave profile. A numerical algorithm for solving the Burgers equation in the time domain using a Godunov-type shock-capturing scheme is developed. Examples of the propagation of model frequency-modulated signals with different envelope shapes at different ratios of nonlinear and dissipative effects, which limit the interaction length of pump waves are considered. Examples of waveforms and spectra evolution during self-demodulation of a high-frequency pump signal are given, with self-demodulation manifesting at shorter distances in strongly nonlinear propagation regimes due to additional attenuation of the wave energy at shock fronts. It is shown that the efficiency of low-frequency radiation generation increases in shockwave propagation modes.

A. V. Kvashennikova

M. S. Sergeeva

P. V. Yuldashev

I. B. Esipov

V. A. Khokhlova

Demodulation of Pulsed Acoustic Signals in Strongly Non-Linear Propagation Regimes

强非线性传播体制下脉冲声信号的解调

The propagation of slit shear waves in the quasi-symmetric structure of piezoelectrics of the 4mm symmetry class has been theoretically investigated. It has been shown that taking into account the unequal level of losses and amplification in piezoelectrics leads in the shear wave spectrum either to an intersection, or to a touch, or to a convergence of two modes at the point of their degeneracy (singular point). It is established that the intersection of the mode spectra occurs only in the case of equal loss and gain values (PT is a symmetric structure). Based on this, it is concluded that by the nature of the spectra near a singular point, it is possible to determine the level of imbalance of gain and loss in piezoelectric waveguides. As in the case of a purely PT-symmetric structure, the frequency dependence of the amplitude at an exceptional point of a quasi PT-symmetric structure (with a fairly small difference in loss and gain levels) has a very narrow peak, which opens up the possibility of creating hypersensitive sensors based on them. Thus, it is demonstrated that even with unequal levels of loss and gain in piezoelectrics (quasi PT-symmetric structure), it is possible to obtain a structure with all the properties of a PT-symmetric structure.

E. A. Vilkov

O. A. Byshevsky-Konopko

D. V. Kalyabin

S. A. Nikitov

Gap Shear Waves in Quasi &lt;i&gt;PT&lt;/i&gt;-Symmetric Piezoelectric Heterostructure Near the Point of Mode Generation

准<i>PT</i>对称压电异质结构在模式生成点附近的间隙剪切波

Publication Information	Publisher: Izdatel'stvo Nauka，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 1999，Proportion of original research papers: ，Self Citation Rate:， Gold OA Rate:

Akusticheskij Zhurnal

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New Features of the Acoustic Journal Archive Site

Tendency of Conductivity of Acoustic Vibration of the Design of Aircraft to Lowering with the Growth of Their Acoustic Loading

On the Mechanism of Lateral Asymmetry of Noise Emission from a Propeller Installed Near a Wing

Demodulation of Pulsed Acoustic Signals in Strongly Non-Linear Propagation Regimes

Gap Shear Waves in Quasi <i>PT</i>-Symmetric Piezoelectric Heterostructure Near the Point of Mode Generation

New Features of the Acoustic Journal Archive Site

Tendency of Conductivity of Acoustic Vibration of the Design of Aircraft to Lowering with the Growth of Their Acoustic Loading

On the Mechanism of Lateral Asymmetry of Noise Emission from a Propeller Installed Near a Wing

Demodulation of Pulsed Acoustic Signals in Strongly Non-Linear Propagation Regimes

Gap Shear Waves in Quasi <i>PT</i>-Symmetric Piezoelectric Heterostructure Near the Point of Mode Generation