scholarly journals RESULTS OF A SERIES OF ACOUSTIC MEASUREMENTS OF NOISE PENETRATING THROUGH THE PARTITION BETWEEN TWO CINEMAS

Akustika ◽  
2019 ◽  
Vol 32 ◽  
pp. 195-200
Author(s):  
Ilya Tsukernikov ◽  
Alexandr Fadeev
Keyword(s):  
Main Part ◽  
Field Measurements ◽  
Sound Insulation ◽  
Acoustic Measurements ◽  
Frequency Range ◽  
Acoustic Parameters ◽  
Regulatory Documents ◽  
The Past ◽  
Airborne Sound ◽  
The Russian Federation

The number of cinemas has increased over the past 10 - 15 years in Russia. The main part of new cinemas is multiplex cinemas in the shopping and entertainment malls. It is mean that in multiplex two cinemas may show the movies at the same time. The problem of airborne sound isolating by a partition/slab between two multiplex cinemas halls is considered. The analysis of the regulatory and technical documents (the International Standard, and the national documents of the Russian Federation, as well as the corporative standards of international cameramen) is done. The levels of penetrating noise through a partition between two cinemas halls are measured for two cinemas. The discrepancy between the estimated sound insulation parameters and the requirements of the current regulatory documents are shown. A series of field measurements of acoustic parameters is carried out. The discrepancy of the airborne sound insulation parameters by partition is shown. The case of one-number estimation of airborne of sound isolation in the law frequency range is considered. The influence of acoustic finishing on the levels of penetrating noise from one cinema hall to another is estimated.

scholarly journals Handclap for Acoustic Measurements: Optimal Application and Limitations

Acoustics ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 224-245 ◽  
Author(s):  
Nikolaos M. Papadakis ◽  
Georgios E. Stavroulakis
Keyword(s):  
Signal To Noise Ratio ◽  
Low Frequency ◽  
Acoustic Parameter ◽  
Reverberation Time ◽  
Octave Band ◽  
Acoustic Measurements ◽  
Frequency Range ◽  
Acoustic Source ◽  
Signal To Noise ◽  
Acoustic Parameters

Handclap is a convenient and useful acoustic source. This study aimed to explore its optimal application and limitations for acoustic measurements as well for other possible utilizations. For this purpose, the following steps were performed: investigation of the optimal hand configuration for acoustic measurements and measurements at different microphone source distances and at different spaces and positions. All measurements were performed with a handclap and a dodecahedron speaker for comparison. The results indicate that the optimal hand configuration (among 11) is with the hands cupped and held at an angle due to the superior low frequency spectrum. This configuration produced usable acoustic parameter measurements in the low frequency range in common room background levels unlike other configurations. The reverberation time was measured across different spaces and positions with a deviation less than three and just a noticeable difference of the signal-to-noise ratio within or near the ISO 3382-1 limits for each corresponding octave band. Other acoustic parameters (i.e., early decay time, clarity) were measured with greater deviations for reasons discussed in the text. Finally, practical steps for measurements with a handclap as an acoustic source are suggested.

Air-Tightness and Acoustic Properties of SuperAdobe System

2014 ◽  
Vol 899 ◽  
pp. 365-368 ◽  
Author(s):  
Jiří Teslík ◽  
Naďa Zdražilová ◽  
Martina Vodičková
Keyword(s):  
Acoustic Properties ◽  
Sound Insulation ◽  
Acoustic Parameters ◽  
Airborne Sound ◽  
Earthen Structures ◽  
Air Tightness

Paper presents results of measuring of airtightness and acoustic properties of clay house. This clay house was built as a "SuperAdobe house" from the bags filled with clay. Construction of the clay house is a cupola. Objective of the measurement was to evaluate the quality of peripheral construction in terms of airtightness. We also wanted to verify the acoustic parameters of earthen structures and determine the value of airborne sound insulation.

scholarly journals AIRBORNE SOUND INSULATION IMPROVEMENT ON MASONRY PARTITIONS USING ADDITIONAL PLASTERBOARD LAYERS

2011 ◽  
Vol 3 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Marius Mickaitis ◽  
Aleksandras Jagniatinskis ◽  
Boris Fiks
Keyword(s):  
Theoretical Calculations ◽  
Low Frequency ◽  
Masonry Wall ◽  
In Situ Measurements ◽  
Sound Insulation ◽  
Frequency Range ◽  
Airborne Sound ◽  
Sound Reduction ◽  
Reduction Index

For the purposes of accumulating knowledge of how to comply with requirements for new buildings of obligatory sound class C or enhanced acoustic comfort sound classes A and B (Lithuanian Building Technical regulations STR 2.01.07:2003), the article discusses improvement on airborne sound insulation of partitions between dwellings using additional plasterboard layers. The results of an empirical approach were obtained performing in situ measurements of the partitions of masonry from silicate blocks and expanded-clay concrete blocks. Theoretical calculations without the evaluation of flanking paths are added. The paper looks at the peculiarities of in situ measurement methods and the estimation of the limiting uncertainty of the sound reduction index. It is showed that the values of the in situ measurements of the airborne sound reduction index in accordance with requirements EN ISO 140 and EN ISO 717 series for rooms having volume higher than 50 m3 varies depending on frequency range. It has been stated, that improvement on the weighed airborne sound reduction index in the frequency range from 100 Hz to 3150 Hz depends on the properties of additional layers and on the characteristics of the main constructions. Resonance in the low frequency range arising due to additional layers may reduce the weighed airborne sound reduction index defined in the frequency range from 50 Hz to 3150 Hz. This fact must be taken into account when designing improvement on masonry wall insulation using an additional layer in dwellings.

scholarly journals Improved Source Characteristics of a Handclap for Acoustic Measurements: Utilization of a Leather Glove

Acoustics ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 803-811
Author(s):  
Rick de Vos ◽  
Nikolaos M. Papadakis ◽  
Georgios E. Stavroulakis
Keyword(s):  
Sound Pressure Level ◽  
Sound Pressure ◽  
Low Frequency ◽  
Pressure Level ◽  
Acoustic Measurements ◽  
Frequency Range ◽  
Acoustic Parameters ◽  
Source Characteristics ◽  
Sound Levels ◽  
Engineering Practices

A handclap is a convenient and easily available source for room acoustic measurements. If used correctly (e.g., application of optimal hand configuration) it can provide usable results for the measurement of acoustic parameters, within an expected deviation. Its biggest drawbacks are the low sound pressure level (especially in the low frequency range) as well as its low repeatability. With this in mind, this paper explores the idea of testing a handclap with a glove in order to assess the effect on its source characteristics. For this purpose, measurements were performed with 12 participants wearing leather gloves. Sound levels were compared with simple handclaps without gloves, and between grouped results (overall A-weighted SPL, octave bands, 1/3 octave bands). Measurements were also performed several times to evaluate the effect on repeatability. Results indicate that the use of leather gloves can increase the sound levels of a handclap by 10 dB and 15 dB in the low frequency ranges (63 Hz and 125 Hz octave bands, respectively). Handclaps with leather gloves also point toward improved repeatability, particularly in the low-frequency part of the frequency spectrum. In conclusion, compared to simple handclaps without gloves, evidence from this study supports the concept that handclaps with leather gloves can be used in engineering practices for improved room acoustic measurements of room impulse response.

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