Calculations of the Acoustic Efficiency of Noise Shields Based on the Numerical Solution of the Sound Diffraction Equation

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Аннотация

Currently, noise-proof wall screens are widely used in urban development to protect against traffic noise, noise from ventilation equipment installed on the roofs of buildings, as well as from other linear and point noise sources. To assess the acoustic efficiency of such screens at the design stage, a practical calculation method proposed by Z. Maekawa for semi-infinite screens of simple geometric shape is used. At the same time, screens of other complex geometric shapes are widely used in the practice of noise reduction by screening in the absence and presence of various technological openings and holes in them. In this case, the application of the calculation method proposed by Z. Maekava may give significant errors in assessing the acoustic efficiency of shielding. For such cases, the article suggests using a method based on the numerical solution of the sound diffraction equation. A computer program has been developed for the numerical solution of the Fresnel-Kirghoff equation and, based on it, the possibility of solving practical problems is shown. Using the program, the influence of openings and gaps available in screens of finite sizes on the acoustic efficiency of shielding is estimated. The proposed numerical method can be applied at the design stage of complex shaped flat noise shields.

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Рұқсат жабық

Авторлар туралы

A. Antonov

Scientific-Research Institute of Building Physics of RAACS; Tambov State Technical University

Хат алмасуға жауапты Автор.
Email: aiant58@yandex.ru

Doctor of Technical Sciences

Ресей, 21, Lokomotivniy Driveway, Moscow, 127238; 106, Sovetskaya street, Tambov, 392000

V. Gusev

Scientific-Research Institute of Building Physics of RAACS

Email: niisf@mail.ru

Doctor of Technical Sciences

Ресей, 21, Lokomotivniy Driveway, Moscow, 127238

V. Ledenev

Scientific-Research Institute of Building Physics of RAACS; Tambov State Technical University

Email: ledvi46@yandex.ru

Doctor of Technical Sciences

Ресей, 21, Lokomotivniy Driveway, Moscow, 127238; 106, Sovetskaya street, Tambov, 392000

I. Matveeva

Tambov State Technical University

Email: times02@yandex.ru

Candidate of Technical Sciences

Ресей, 106, Sovetskaya street, Tambov, 392000

I. Shubin

Scientific-Research Institute of Building Physics of RAACS

Email: niisf@niisf.ru

Corresponding Member of the RAASN, Doctor of Technical Sciences

Ресей, 21, Lokomotivniy Driveway, Moscow, 127238

Әдебиет тізімі

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Әрекет
1. JATS XML
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2. Fig. 1. A scheme for calculating noise emission by a source element

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3. Fig. 2. Calculation scheme for the numerical solution of the diffraction equation

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4. Fig. 3. The layout of the screen (a) in the example given in [9], and the sound pressure levels at the calculated point behind the screen (b): 1 – calculation according to the expression (1) without taking into account the reflection from the floor; 2 – the same taking into account the reflection of sound from the floor; 3 – levels according to the measurement results according to [9]; 4 – calculation of levels according to the Maekawa method; 5 – levels in the absence of a screen

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5. Fig. 4. Aperture radiation diagrams at various frequencies from 31.5 to 1000 Hz

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6. Fig. 5. Diagram of screens with an opening (a) and a gap (b)

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7. Fig. 6. The scheme of dividing the integration area into zones (view from the calculation point)

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8. Fig. 7. Calculated values of sound pressure P (in conventional units) at a distance of 6 m from the screen with an opening at a frequency f=500 Hz for calculated situations: a – diffracted sound without taking into account its reflection from the base behind the screen; b – diffracted sound reflected from the base behind the screen; c – total diffracted and the sound reflected from the base. Graph designations: 1–5 – sound pressures from the zones indicated in Fig.6; 6 – sound pressure from the opening; 7 – total sound pressure excluding the opening; 8 – total sound pressure taking into account the opening

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9. Fig. 8. Sound pressure levels behind the screen in the absence and presence of openings or gaps

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10. Fig. 9. The efficiency of the screen at a frequency of f=1000 Hz in the presence and absence of an opening or gap in it

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