Is the bedroom noise 40 decibels?

The big one. The noise in the bedroom is 40 decibels, which is equivalent to the hum of the refrigerator. The state has regulations on the decibel of noise. The noise in residential areas should not exceed 50 decibels during the day and should be lower than 40 decibels at night. If the noise level in the bedroom is higher than 40 decibels at night, it is noise. The bedroom is where we sleep, which requires a lot of environment. If there is a buzzing sound all the time when we sleep, I believe it is difficult for some people with poor sleep quality to fall asleep. Long-term noise interference can also cause fatigue, memory loss and other symptoms.

Noise is a kind of sound that causes people to be agitated or loud and is harmful to human health.

From the point of view of environmental protection, any sound that interferes with people's normal rest, study and work, as well as the sound that interferes with people's listening, belongs to noise.

mode of production

Vibration generation

Rotating machinery: Many mechanical equipment or some parts are rotating, which often produces abnormal vibration due to assembly loss or bearing defects, and then produces noise.

Impact: when an object is impacted, it will convert a lot of kinetic energy into vibration or noise energy in a short time, with a wide frequency distribution range, such as punch, press, forging equipment, etc. , will produce such noise.

Resonance: Every system has its natural frequency. If the excitation frequency range overlaps with the natural frequency, it will produce large amplitude vibration noise, such as engines and motors.

Friction: This noise is caused by the sliding phenomenon between the contact surface and the attachment surface. Common equipment includes cutting and grinding.

Traffic generation

Aerodynamic noise caused by flow, turbulence, jet, cavitation, gas cutting, vortex and other phenomena. When the air flows through the conduit or metal surface at high speed, when the air flows in the conduit and encounters turbulence or large and rapid pressure change, noise will be generated.

environmental noise

General environmental noise mostly comes from random noise sources, such as speeding vehicles, aircraft horns, human noise, and various noise sources around.

Combustion generation

In the process of combustion, explosion, exhaust and the disturbance of updraft to the surrounding air during combustion may occur, which will be accompanied by noise. Combustion equipment, such as engines, boilers, smelting furnaces, turbines, etc. Will produce this noise.

Other reasons

In daily life, such as indoor household appliances will produce sounds, such as air conditioners, stereos, range hoods, televisions and air-conditioning equipment, which are all noise sources. In addition; Such as schools, shopping malls, parks, stadiums and other public places can also be regarded as places that produce noise.