GB/T 2888-91 Measurement Method for Noise of Fans and Rotary Blowers
This standard, GB/T 2888-91, specifies the methods for measuring the noise from fans and rotary blowers. The purpose of this document is to provide uniform requirements for determining the noise of such equipment to be used for comparison and safety purposes.
The standard outlines the procedures for three different levels of noise tests. They are (1) full-load noise test, (2) partial-load noise test, and (3) apparent noise power level test. For each of these tests, the measurement conditions and the test location are specified.
The full-load noise test measures the noise power over the entire operating range of the fan or blower. In order to conduct this test, the fan or blower is operated at full speed and sound pressure levels measured at several specified points. The partial-load noise test is similar to the full-load one but the fan or blower is only operated at a single speed and the sound pressure levels measured at one point.
The apparent noise power level test is used to estimate the noise power produced by the fan or blower without taking into account the ambient noise. In this test, the sound pressure levels are measured with the fan or blower in operation and the environmental noise levels are also determined.
For all three types of tests, the standard specifies the measuring equipment and instrumentation to be used and the test environment. It also provides detailed methods for making the noise measurements and calculating the noise level in dBA.
The data resulting from these noise tests can be used to determine the typical sound levels produced by the fan or blower and also to compare the noise output of different models. The data can be used to estimate the sound pressure levels at various distances from the fan or blower and also to determine the noise levels to which a person may be exposed over time.
In many cases, the noise power data can be used to predict the sound pressure distribution at a particular distance from the fan or blower. This information is useful in designing sound barriers and in determining the best placement for fans and blowers in a facility.
By establishing noise criteria, the data from these tests can also be used to compare the performance of several fans or blowers before making a selection.
In conclusion,GB/T 2888-91 provides a standard for measuring the noise from fans and rotary blowers. By following the procedures outlined in the standard and using the data obtained from these tests, it is possible to evaluate the performance of different models and to determine the sound levels in specific environments. Additionally, the results of such tests can be used to determine the sound pressure distribution at a particular distance from the fan or blower.
