Wireless Building Acoustic Measurement System AHAI1002

Wireless Building Acoustic Measurement System AHAI1002Scope of application

1. Indoor reverberation time measurement, airborne sound insulation measurement

Stop producing sound after reaching steady state, and the average sound energy density decreases from the original value60 dBThe required time, called reverberation time, is recorded asT₆₀, in seconds(s).Reverberation time is a widely used parameter in architectural acoustics measurement. When measuring the sound absorption coefficient of a reverberation chamber, reverberation time is required. In building sound insulation measurement, the correction of the sound absorption amount of the receiving chamber requires reverberation time. It is an important acoustic indicator of indoor sound quality, an important calculation parameter for sound reinforcement system design, and an important calculation parameter for indoor noise reduction design.

Related standards:

GBT 50076-2013Specification for measuring indoor reverberation time

ISO 3382-2：2008 acoustics Measurement of Room Acoustic Parameters Measurement of reverberation time in general rooms

The measurement of reverberation time can be done using the interrupted sound source method（interrupted noise method）The interruption of sound source method is a method of recording the decay curve of sound pressure level at a certain point in the room by suddenly cutting off the sound source after the indoor sound field reaches a steady state.

Laboratory measurement of airborne sound insulation of building components（GB/T 19889/ISO 140）Building components include walls, floors, doors, windows, building exterior wall components, and building exterior walls, but do not include small-sized components. The measurement results can be used to design building components with good sound insulation performance, compare the sound insulation performance of building components, and classify them based on their sound insulation performance.

In traditional architectural acoustics reverberation time and air sound insulation measurement, measuring equipment includes12Surface sound source, amplifier, microphone, multi-channel signal analyzer, computer, during measurement12The surface sound source is placed in the sound chamber, and the cable is connected to the power amplifier outside the room. The power amplifier is connected to a multi-channel signal analyzer. The microphone is mounted on a tripod and placed inside the sound receiving room. It is then connected to a multi-channel signal analyzer through a cable outside the room, which is then connected to a computer. This measurement method requires all measuring equipment to be connected through cables, and the multi-channel signal analyzer and computer are large and heavy, making measurement inconvenient.

In order to make measurement as convenient as possible, Hangzhou Aihua Instrument Co., Ltd. has launched a wireless measurement solutioniSV1101Wireless sound level meters and tablets replace multi-channel signal analyzers and computers, both of which useWIFIConnect to the measurement network; The amplifier is added to the signal generation unit and also passes throughWIFIBy connecting to the measurement network, the software can automatically control the sound source to produce sound and receive measurement data during measurement, truly achieving the goal of one click measurement; This solution does not require wiring between rooms, making it more suitable for places where wiring is difficult and improving testing efficiency.

2. Measurement of sound insulation caused by floor impact

The sound insulation measurement of floor slab impact is to excite the floor slab with a standard impactor and measure the floor slab impact noise below the floor slab. Divided into laboratory measurements（GB/T 19889.6 / ISO 140-6）And on-site measurement（GB/T 19889.7 / ISO 140-7）Two methods. Suitable for measuring bare floor slabs and also for measuring floor slabs with cladding layers. The measurement results can be used to compare the impact sound insulation performance of floor slabs, and to classify them based on their impact sound insulation performance.

In traditional architectural acoustics, the measurement equipment for floor impact sound insulation includes impactors, microphones, multi-channel signal analyzers, and computers. Place the impactor during measurementexistOn the upper floor of the tested room, the microphone is connected to the multi-channel signal analyzer through a cable outside the tested room, and then connected to the computer. This measurement method requires all measuring equipment to be connected through cables, and the multi-channel signal analyzer and computer are large and heavy, making measurement inconvenient.

In order to make the measurement as convenient as possible, we have introduced a wireless measurement solution that uses1toweriSV1101Wireless Sound Level Meter and1A tablet replaces multi-channel signal analyzers and computers, and the standard impactor is also wireless. They pass throughWIFIConnection is not necessary between rooms, making it more suitable for places where wiring is difficult and improving testing efficiency.

3. Sound insulation measurement of buildings and building components

（1）Overview: Sound insulation measurement mainly measures the sound pressure level difference at different center frequencies on both sides of the sound chamber and the sound chamber.

According to different transmission routes, it can be divided into:

AMeasurement of airborne sound insulation

BMeasurement of sound insulation caused by floor slab impact

（2）Related standards:

GB/T50121-2005Standard for assessment of building sound insulation

GB/T19889.1-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers1Part: Requirements for laboratory testing facilities with suppressed lateral sound transmission

GB/T19889.2-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers2Part: Determination, validation, and application of data precision

GB/T19889.3-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers3Part: Laboratory measurement of airborne sound insulation of building components

GB/T19889.4-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers4Part: On site measurement of airborne sound insulation between rooms

GB/T19889.5-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers5Part: On site measurement of exterior wall components and exterior wall air sound insulation

GB/T19889.6-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers6Part: Laboratory measurement of floor impact sound insulation

GB/T19889.7-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers7Part: On site measurement of floor impact sound insulation

GB/T19889.8-2005acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers8Part: Laboratory measurement of improvement in impact sound of heavy standard floor cladding layer

GB/T19889.10-2006acoustics Sound insulation measurement of buildings and building components auxiliary word for ordinal numbers10Part: Laboratory measurement of airborne sound insulation of small building components

4. Measurement Block Diagram

5. Software Introduction

Wireless Building Acoustic Measurement Software

Wireless Building Acoustic Measurement Software is a measurement software that runs on smartphones or tablets. When paired with instruments, it can achieve accurate measurements and supportWIFIThe functions that can be achieved by obtaining measurement data and analyzing it are as follows:

• Indoor reverberation time measurement
• Measurement of sound insulation caused by floor impact
• Measurement of airborne sound insulation of building components
• Measurement of airborne sound insulation between rooms
• Measurement of external wall components and external wall air sound insulation
• Support multiple wireless devices to connect simultaneously
• Equipped with operation guidance mode, even beginners can easily use it

Wireless Building Acoustic Measurement System AHAI1002Comparison of New and Old Measurement Plans