Russian Research On Noise Proof Performance Of Hardcover Fabrics For Professional Wear

With the increasing efficiency of modern equipment, noise and vibration often increase. Years of research have shown that the general influence of noise on human body is the speed of distraction, acceleration of fatigue and delayed nerve response.

The deep influence of noise on the whole body is the change of respiratory rhythm, the change of heart activity, the change of blood pressure, the slow digestion process, and even cause the disorder in the whole body.

In order to protect workers' health, it is necessary not only to protect the human head and ears, but also to protect the whole human body.

Russia's southern national electrical manufacturing University studied specialties for professional wear.

The absorption of sound wave is directly related to material structure and thickness. Sound absorbing materials should have porous structure.

The experimental device is a sealed metal box that separates the external sound.

The device has the opposite parts of both sides, and all the holes are opened.

A hole is equipped with an electric loudspeaker.

The oscillator generates a maximum repetition frequency of 500 Hz, 1000 Hz, and 3000 Hz, which produces the maximum repetitive sound pressure and the minimum sound pressure.

Apart from 20mm, another hole opposite to the diameter of 15mm can be used to detect different fabrics.

Pass by noise meter