Sound Power Testing Solution

Project Overview

When people purchase tools, home appliances, mechanical equipment, and other devices, the noise level of the equipment has gradually become an important factor to consider. Although the level of sound pressure is an important indicator for evaluating the size of noise, the magnitude of sound pressure is affected by the test distance and the environment during measurement. Therefore, sound pressure alone cannot be used to measure the sound radiating energy of a sound source. At this time, we need to test the sound power of the product.

So, what is sound power?

Sound power is a way to measure the intensity of sound and can be understood as the "energy" of the sound. Just as the power of a light bulb indicates the intensity of the light it emits, sound power indicates the intensity of the sound. Imagine throwing a stone into a lake; the ripples created by the stone are like sound waves spreading through the air. The harder you throw the stone, the larger the ripples it creates. Similarly, the greater the sound energy produced by the sound source, the higher the sound power, and the louder the sound we hear.

Sound power testing measures the absolute acoustic energy of a product, which is independent of the acoustic environment it is in. Therefore, when determining the noise emitted by a product, sound power is the preferred measurement parameter. Moreover, sound power cannot be measured directly; it must be calculated from the measured sound pressure level or sound intensity level.

An Introduction

Examples of applicable testing standards include:

• GB/T 3768-2017 / ISO 3746:2010 (Simple method using the measurement surface that is enveloped by the reflection surface)

• GB/T 3767-2016 / ISO 3744:2010 (Engineering method for an approximate free field over the reflecting surface)

• GB/T 6682-2016 / ISO 3745:2012 (Precision methods for anechoic and semi-anechoic rooms)

• GB/T 4214.1 Noise testing methods for household and similar electrical appliances - A series of test standards

• IEC 60704 Household and similar electrical appliances - Test code for the determination of airborne acoustic noise - A series of standards

• GB/T 34877.3-2017 Measurement of sound power levels of industrial fans under standard laboratory conditions - Part 3: Enveloping surface method

• GB/T 18801 Air purifiers

Sound power testing usually involves the use of multiple microphones to collect data synchronously. The microphones will encircle the product being tested, creating an enveloping surface around the sound source. The number of microphones and the method of creating an enveloping surface required for products of different sizes differ and should be chosen based on the specific product being tested.

Configuration List

Summarize