SU1761889A1 - Method and device for assessing structure sound insulation - Google Patents

Abstract

Use: construction. SUMMARY OF THE INVENTION: The sound pressure level in a low level room is measured by transferring a noise source there and a correction for sound absorption is determined. The device contains a standard percussion machine, a measuring microphone and recording equipment. The shock machine is located in the resonating cavity. 1 hp f-ly, 3 ill.

Description

The invention relates to construction and can be used to measure the sound insulation of enclosing structures of buildings and structures.

A device for determining sound insulation of enclosing structures is known, comprising high and low level cameras connected via sound level meters to amplifiers of an input unit consisting of filters, detectors, logarithmic cascades, subtraction circuits, and a display unit.

The device discloses the definition of sound insulation by creating sound pressure in a high-level chamber and recording the sound level in a low-level chamber by means of an electronic recording path. On the cathode ray tube, one can observe the particular characteristics of the sound insulation of the enclosing structures, the normative curve, as well as their difference characteristics.

A disadvantage of the known solution is the difficulty in implementation and the laboriousness in manufacturing, which is caused by the presence of

numerous electronic components and connections between them. It also increases the possibility of measuring errors and reduces the accuracy of measurements. The method can be implemented only in laboratory conditions.

The closest technical solution is a method for determining the sound insulation of a structure, including the creation of shock pulses on the overlap by means of a shock machine for measuring the sound pressure levels in a high and low level room by a microphone, determining their difference and determining the sound insulation index,

The closest known one is a device for determining the sound insulation of structures, containing a noise source in the form of a standard percussion machine, a measuring microphone connected to the measuring equipment.

The disadvantage of this method is the duration and complexity of the process

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measurements of sound insulation, the need to accurately determine the location of the clamp of the receiving device to the overlap.

The purpose of the invention is to reduce the complexity of the determination.

The goal is achieved by the fact that in the method of determining sound insulation of structures, including creating shock pulses on the overlap by means of a shock machine, measuring sound pressure levels in a high and low level through a microphone, determining their difference and determining the sound insulation index, the sound pressure level is additionally measured in a low-level room, when placed in a noise source, a correction for sound absorption without measuring the reverberation time is determined; ukoizol tion by the formula

R a - ar + A b, dB,

where a is the sound pressure level in the high level room, dB;

with sound pressure level in a low level room, dB;

A b is the sound absorption correction for measuring sound insulation from airborne noise, dB.

In addition, a device for determining sound insulation of structures, structures, containing a noise source in the form of a standard percussion machine, a measuring microphone connected to the measuring equipment, is provided with a resonating cavity, the impact machine is placed in a resonating cavity and is acoustically isolated from the structure under study.

Figure 1 presents a General view of the device; Fig. 2 is a diagram for determining the insulation of airborne noise; Fig. 3 is a circuit for determining the insulation of impact noise.

The device contains a percussion machine 1, placed in the resonating cavity 2, the measuring microphone 3.

The measurement of isolation from airborne noise according to the proposed method is carried out as follows.

A standard percussion machine 1, as shown in Fig. 2, is placed in the resonating cavity 2 and is placed on the floor of 3 high level premises 4. Using a portable sound level meter with microphones 5 and 6, the sound pressure level 4 is measured in a high level room and in a low level room level 7. Then the noise source is transferred from the high level room 4 to the low level room 7. According to the difference in the noise levels of the low level rooms and the calibration value of the sound pressure levels of the noise source Lk, the corrections for sound low level indoor absorption

Insulation measurement of impact noise is determined as follows.

A standard drum machine 1, as shown in FIG. 3, is mounted on an overlap 8 in a high-level room 4. Using a microphone 6 and a portable sound level meter, the sound pressure level is measured

Li is in a low-level room 7. Then the impact machine is placed in a resonating cavity, transferred to a low-level room 7, and a correction for sound absorption in a low-level room is determined.

Level 7.

Claims (2)

1. A method for determining the sound insulation of structures, including the creation of shock impulses on the overlap by means of a percussion machine, measuring the sound pressure levels in a high and low room. By means of a microphone, determining their difference and determining the sound insulation index that reduce the complexity of the determination, additionally measure the sound pressure level in a low-level room when placed in her noise source, determine the correction for sound absorption without measuring time reverberation, and sound insulation index is determined by the formula R ai -ag + A b, dB where (21 is the sound pressure level in the high level room, dB; ag is the sound pressure level in a low level room, dB; AB - correction for sound absorption for measuring sound insulation from airborne noise, dB. 2. A device for determining the sound insulation of structures containing a source of noise in the form of a standard shock machine, a measuring microphone connected to the measuring apparatus, characterized in that, in order to reduce the laboriousness of the determination, the device is provided with a resonating polarity The impact machine is located in the resonating cavity and is acoustically isolated from the structure under study. / 688L9AL FIG. 3