Welcome to visit the column "elevator noise prevention and control I am an expert - ask if you don't understand". This article is the fourth chapter of the column.

Chapter 4 will elevator noise decrease in summer?

Welcome to visit the column "elevator noise prevention and control I am an expert - ask if you don't understand". This article is the fourth chapter of the column.

When encountering elevator noise, our proposition is "ask if you don't understand, welcome to ask!" The elevator noise problems you encounter will be answered and answered by the authoritative expert "Mr. elevator" in China.

The topic of this chapter comes from the following questions raised by residents in two different areas who are troubled by elevator noise:

1. Ms. Liu, a top-level resident in Hefei, Anhui Province, called for consultation. Last winter and the beginning of this year, the elevator noise was particularly unpleasant. Ms. Liu has been chasing the development company for solutions. But after the recent summer, the sound of the indoor elevator seems to be significantly smaller, which is not as hard as before, so call us: will the noise of the elevator become smaller in the summer? (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

2. A penthouse duplex resident in Lianyungang, Jiangsu Province also called recently to inquire about the hot weather. After the air conditioner was turned on at home, the elevator noise seemed to be less than before. I hope to know if the elevator noise is related to the weather?

Customer technical question: is the elevator noise related to the weather? Will the elevator noise decrease in summer?

background

Ms. Liu, who lives in Hefei, Anhui Province, lives in a small high-rise top-level apartment. Because of the adjacent design of one of the secondary bedrooms and the elevator, the interior is affected by large elevator noise when the elevator is running. After she moved in last year, Miss Liu, who has been deeply troubled by the elevator noise problem, once consulted Shenzhen and Japan company for many times, and hired technicians from Shenzhen and Japan company to test the indoor elevator noise in March this year. It was found that the indoor elevator noise during the operation of the elevator was as high as 41.2db (background noise 24.6db). After confirming that the elevator noise exceeds the standard, Miss Liu asked the developer to provide solutions with the data of noise exceeding the standard, but the developer has been procrastinating to implement the rectification. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

Since entering the summer, especially after the air conditioner is turned on recently, it is found that the impact of elevator noise is not as serious as before (although there is still an impact). So Miss Liu specifically called to ask technical questions.

Professional technical answer: Elevator noise is not affected by the weather, in summer will not be significantly smaller!

Mr. elevator answers:

Elevator noise will not decrease significantly in summer. Through our in-depth investigation and analysis, the changes of indoor elevator noise reflected by the elevator noise sufferers in summer are mainly caused by the difference of background noise or the masking effect of sound. The main investigation and analysis basis are as follows:

a. There is no substantial change in indoor elevator running noise detection

In response to Liu's query in Hefei, Anhui Province, Shenzhen and Japan technicians once again tested Liu's indoor elevator running noise in the later stage. The second indoor noise was 39.7 dB (background noise 28.3 dB). From the analysis of the two indoor elevator noise detection data, there is no difference in the essence of the indoor elevator noise. The two detection locations are the same location in the same room, the same detection method, but the actual noise difference is only 0.5 dB, which we think should be the difference in the detection period, that is to say, the elevator noise actually does not decrease. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

b、 Why does Miss Liu obviously feel that the elevator noise is reduced?

The magnitude of noise is not exactly equal to people's perception, especially the solid sound transmission effect caused by noise source pointing to a single device. People's perception and discomfort degree of noise mainly depend on the frequency of noise and the difference between equipment noise and background noise.

The example in life shows that in a quiet night, when mosquitoes are flying, the reason why people feel uncomfortable is not that the sound of mosquitoes is too loud, but that the sound emitted by mosquitoes belongs to a narrow-band vibration with a single frequency. Moreover, compared with the background noise (the environment without mosquitoes flying), the more obvious the difference is, the more uncomfortable people are, that is, the more uncomfortable the background is. If you turn on the music, you won't hear the mosquito, and you won't feel bad anymore. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

The reason why Miss Liu thinks the elevator noise is obviously low is not because the elevator noise is really low, but the original detection in March was the background noise of 24.6db, the measured indoor noise value of 41.2db, the actual difference of 16.6db; the latest detection result is the background noise of 28.3db, the indoor noise of 39.7db, the actual difference of 11.4db. The difference value changes obviously, so people's sense changes naturally.

In addition, especially in summer, the room is usually in the state of opening windows, which may lead to the increase of indoor background noise and the decrease of the actual difference between elevator operation and background noise, so people's perception will have obvious changes; or, in hot summer, when the air conditioner is turned on, in general, the noise of air conditioner operation is 40-45 dB, so when the air conditioner is started When, the indoor noise of air conditioning will cover up the original part of elevator noise, so people's feeling also has obvious changes. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

To sum up, the elevator noise reflected in your place is not affected by the weather. Although it will be significantly smaller in summer, but in order to thoroughly cure and solve the problem of elevator noise, it is still necessary to install vibration reduction and noise reduction measures in the machine room.

Since the research and development of noise reduction system for elevator room in Shenzhen and Japan in 2004, it has been widely used in most cities and regions in China. After installing the noise reduction products of Shenzhen and Japan elevators, you will no longer be disturbed by the low-frequency noise of "buzzing", which can restore the quiet space indoors and make your life healthier. Shenri company solemnly promises to the residents: after noise reduction treatment, it can ensure the satisfaction and recognition of the residents, and no charge will be charged if it fails to meet the standard. Therefore, if necessary, you can call the Shenzhen Japan noise reduction hotline for technical consultation (0755-86379063). (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

Column introduction

I am an expert in elevator noise prevention

Mr. elevator, the enlightener of China's elevator noise reduction industry, has been promoting the application of elevator noise prevention and control technology nationwide since 2005. He has provided free consultation and technical answers to the users who are bothered by elevator noise through blogs, QQ, forums, etc. For more than ten years, we have been sticking to our original dream: "to eliminate elevator noise and save people's quiet life!" So far, Mr. elevator and his team have served more than 100000 users.

In order to let more customers get timely answers when encountering difficulties in elevator noise control, Mr. elevator has since March 2019 set up a column in WeChat public, "elevator noise prevention, I am an expert - I don't understand you." Customers are welcome to ask questions through the WeChat public number "elevator noise control", elevator signal or telephone.

In addition, we will regularly select some representative "elevator noise questions" to give public answers, so that more customers suffering from elevator noise can find the right answers!

"Mr. elevator" claims: "when encountering elevator noise, ask if you don't understand. Welcome to ask!"