We are always exposed to all kinds of noise in our daily life. Many studies have shown that noise has a negative impact on physical and mental health. In order to enhance the understanding of noise pollution, today we will talk about what harm noise can bring, what noises are around us and noise control methods.
Although noise is invisible and qualityless, it is pervasive and can hurt people invisible.
The first is the “hard damage” to hearing.
In the past, many blacksmiths were deaf. This is because forging iron all day long and always being in a noisy environment, the auditory hair cells in the ear will lose sensitivity, and the hearing will decline over time. In addition, all kinds of machinery in many factories are noisy when they are fully operating. If you do not wear earmuffs, it will also cause hearing loss. Sudden loud noises, such as explosions and impacts, can also damage the ears and cause temporary or even permanent deafness. There are also some low-frequency noises that can even directly affect internal organs.
In addition, the noise will also bring some “soft damage”.
We may all have the experience of being more irritable in a noisy environment. This is not an illusion. Noise does not only hurt the ears, but also causes a series of adverse reactions to our body and mind, such as insomnia, headache, nausea, irritability, and lack of concentration.
What is the harm of noise related to?
One of the most important factors, of course, is volume. Consistent with common sense, the louder the noise, the more damage.
To measure whether the sound is loud or not, we often have to use a unit called decibel (written in dB). For example, we often hear that 160dB will cause unbearable pain and even faint; the noise of a jet plane can reach 120dB; the sound above 85dB will cause irreversible damage to the ears; 40dB in a quiet park environment and so on.
In addition to the volume, the type of noise affects how we perceive it. The harsh noise of a metalworking factory, for example, can be more maddening than the deafening music at a music festival. White noise at a moderate volume is helpful for many people to calm their minds.
Noise lurks in our home.
When it comes to noise, we often think of bustling markets and busy factories. But in fact, we often have noise pollution in our own homes, but it is often difficult for us to detect it.
One of the main reasons is that people’s adaptability is really strong. Many regular noises, such as computer case fans, air conditioners, refrigerators, etc., may be a bit noisy at first, but after a long time of operation, we will automatically ignore them. But if the volume is louder, it will still be bad for your health in the long run.
There are also some noises that are relatively hidden. The noise below 500Hz is called low-frequency noise. On the one hand, this kind of noise is not easy to be heard by people. Common equipment such as elevator operation, air conditioning refrigeration, and water pumps may cause low-frequency noise, which can be alleviated by adding shock absorption measures.
In addition, great music, while strictly by definition not noise, can still damage hearing if the volume is turned up too high when listening to music, especially when using earbuds.
Noise can impair control in these ways.
When the noise is too loud and the source of the noise cannot be found, it is necessary to take acoustic measures directly on the noise transmission path, including common noise control technologies such as sound absorption, sound insulation, sound elimination, vibration reduction, and vibration isolation.
Sound absorption: Use sound-absorbing materials to reduce indoor reflected sound, such as hanging sound-absorbing bodies, acoustic ceilings, etc. to reduce noise.
Sound insulation: Use sound insulation structures to separate the noise source from the receiving point. Commonly used are sound insulation enclosures, sound insulation rooms and sound insulation screens.
Noise elimination: Use the principles of resistance, resistance, small hole injection and porous diffusion to reduce airflow noise.
Vibration reduction: use damping material with high internal friction and energy consumption to coat the surface of vibrating parts to reduce vibration.
Vibration isolation: Change the rigid contact between the equipment with vibration and the foundation to elastic contact to isolate the transmission of solid sound.
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