Noise is a common cause of hearing loss, in fact, not only occupational exposure workers, the general population in daily life will have the opportunity to be exposed to various degrees of noise, may occur a variety of degrees of hearing loss, without awareness. Noise doesn't just affect hearing, it can also affect cardiovascular health, sleep, and even fetal development.

The noise generated by the general machine is about 90 decibels (decibels), and the general factory workers are exposed to about 85 to 95 decibels in the working environment. The noise that ordinary people may encounter in their living environment are: The sound of an airplane engine, hot music can reach 120 decibels or more, the sound of a train passing by 100 decibels, the sound of a large truck passing by 85 decibels, the sound of a vacuum cleaner 70 decibels, the sound of a normal conversation 60 decibels, the sound of a car moving slowly 50 decibels, a quiet office about 40 decibels, and the sound of grinding leaves about 20 decibels. The United States Environmental Occupational Institute stipulates that the general hearing protection standard is not more than 8 hours at 90 decibels, and not more than 4 hours at 95 decibels. Otherwise 100% there is a risk of hearing damage. In fact, every 3 decibels increases the energy of sound by a factor of 5 decibels.

Noise to the physical and psychological harm mainly has the following aspects: damage to hearing. Tests show that when people continuously listen to the sound of motorcycles, hearing will be damaged after 8 hours; If you're in a rock hall, after half an hour, you lose your hearing. A survey of urban noise and health in China shows that for every decibel increase in local noise, the incidence of hypertension increases by 3%. It affects people's nervous system and makes people irritable and irritable. It affects sleep and causes fatigue.

From a psychoacoustic perspective, noise, also known as noise, generally refers to inappropriate or uncomfortable auditory stimuli. It is a compound sound composed of a large number of frequencies and has aperiodic vibration. In short, noise is an aperiodic sound vibration. Its acoustic wave is irregular and it sounds harsh. From a social and psychological sense, any sound that interferes with people's study, work and rest and makes people feel uncomfortable is called noise. Such as the sound of running water, banging, rustling, machinery roar, etc., are all noise. It is measured in decibels. Zero decibels is the low intensity of audible sound.

Train noise

Noise can be divided into high intensity and low intensity. Low intensity noise in general is not harmful to people's physical and mental health, and in many cases it is also conducive to improving work efficiency. High intensity noise mainly comes from industrial machines (such as looms, lathes, air compressors, pickaxes, blowers, etc.), modern means of transport (such as cars, trains, motorcycles, tractors, aircraft, etc.), loudspeakers, construction sites, as well as shopping malls, sports and entertainment venues. These high-intensity noises harm people's bodies, make people feel tired, produce emotion, and even cause disease. High intensity noise, not only damage people's hearing, but also on the nervous system, cardiovascular system, endocrine system, digestive system, vision, intelligence and so on have a small degree of impact. If people work and live at 95 decibels for a long time, about 29% will lose their hearing; Even if the noise is only 85 decibels, 10% of people will develop deafness; 120~130 decibels of noise, can make people feel pain in the ear; Higher noise will damage the hearing organs. In the nervous system, strong noise can cause headache, dizziness, fatigue, insomnia, emotional unrest, memory loss and other symptoms, EEG slow wave increase, vegetative nervous system dysfunction; In the cardiovascular system, strong noise can cause changes in pulse and heart rate, increase in blood pressure, arrhythmia, conduction block, peripheral blood flow changes, etc. In terms of endocrine system, strong noise can cause hyperthyroidism, enhanced adrenal cortex function, increased basal metabolic rate, sexual dysfunction, menstrual disorders, etc. In terms of digestive system, strong noise will cause people to have reduced digestive function, stomach function disorders, stomach acid reduction, loss of appetite and so on. In short, strong noise can lead to a series of physiological and pathological changes in the human body. Some people have conducted a survey of 202 people working in an environment with a noise of 95 decibels, 39% of dizziness, 32% of insomnia, 27% of headache, 27% of stomach pain, 27% of panic, 27% of memory loss, 22% of upset, 18% of poor appetite, 12% of high blood pressure. Pregnant women are in a noise environment of more than 50 decibels for a long time, which will cause endocrine gland dysfunction, and mental tension and endocrine system disorders. Severe cases can increase blood pressure, cause fetal hypoxia and ischemia, lead to fetal malformation and even abortion. High decibel noise can damage the hearing organs of the fetus, causing some areas to be affected. It affects the development of the brain and leads to low intelligence in children.

The malignant stimulation of noise seriously affects people's sleep quality, and can lead to dizziness, headache, insomnia, dreaminess, memory loss, inattention and other neurasthenic symptoms and nausea, vomiting, stomach pain, abdominal distension, sluggish appetite and other gastrointestinal symptoms. Nutritionists have found that noise can also increase the consumption of nutrients such as vitamins, micronutrient nitrogen acid, glutarine acid, and lyazic acid in the human body, affecting health; Noise makes adrenal gland secretion increase, heart rate increase, blood pressure rise, easy to lead to heart attack; Noise can reduce the secretion of saliva and gastric juice, reduce gastric acid, and thus suffer from gastric ulcer and duodenal ulcer. Harmful to people's cardiovascular system, a Chinese survey of urban noise and residents' health shows that for every 1 decibel increase in local noise, the incidence of hypertension increases by 3%. It affects people's nervous system, makes people irritable, irritable, affects sleep, and causes fatigue.
It is because noise has so many harms that we human beings have been studying how to reduce noise and reduce harm, especially with the progress of society, countries are paying more and more attention to these. Many countries have issued a variety of noise regulations, we have studied in the field of acoustics for more than 20 years, we have rich experience to help enterprises to solve industrial noise problems, we customized a variety of soundproof enclosures, workshop soundproof rooms, soundproof test boxes to help customers solve noise problems, by the global customer praise.