Summary: Gree Electric Appliances, the largest air-conditioning enterprise in the world, started to build an industrial park in Wuhan Economic & Technological Development Zone.The foundation laying ceremony for the Gree Electric Appliances Wuhan Industrial Park Project was grandly held in Wuhan Economic & Technological Development Zone. Yang Song, Deputy Secretary of the Hubei Provincial Party Committee and Secretary of the Wuhan Municipal Party Committee, announced the foundation laying of the project at the ceremony. Leaders such as Duan Lunyi, Vice Governor of Hubei Province, and Ruan Chengfa, Mayor of Wuhan City, as well as Zhu Jianghong, Chairman of Gree Electric Appliances, and Dong Mingzhu, President of Gree Electric Appliances, attended the foundation laying ceremony and jointly tamped the earth for the project.
The semi-anechoic chamber is not only a special laboratory for acoustic testing but also an important part of the testing system. In fact, it is also one of the acoustic testing equipment, and its acoustic performance indicators directly affect the testing accuracy. For detailed information on specific acoustic design, manufacturing, construction, installation, and on-site actual measurement and acceptance introduction, etc., please pay attention to browsing the project cases on the official website of our firm, or scan the QR code of the WeChat public service account of our enterprise to get free push notifications. For detailed materials, please go to the download center on the official website of our corporation to download them for free.
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I. Purchasing Content
Semi-anechoic chamber
II. Basis Standards
(1) GB/T 6882 "Acoustics - Determination of Sound Power Levels of Noise Sources - Precision Methods for Anechoic and Hemianechoic Chambers";
(2) ISO 3745 "Acoustics - Determination of Sound Power Levels of Noise Sources - Precision Methods for Anechoic and Hemianechoic Chambers";
(3) GB/T 7725 "Room Air Conditioners";
(4) GB/T 18836 "Duct-type Air-conditioning (Heat Pump) Units";
(5) GB/T 4214.1 - 2000 "Test Method for Noise of Household and Similar Electrical Appliances";
(6) JB/T 4330 - 1999 "Determination of Noise of Refrigeration and Air-conditioning Equipment".
III. Main Indicators and Project Content (Effective Space and Background Noise, etc.)
1. The indoor dimensions of Semi-anechoic Chamber A are: 5.4m (Length) * 5.2m (Width) * 3.6m (Height) (±100mm);
The indoor dimensions of Semi-anechoic Chamber B are: 5.4m (Length) * 5.2m (Width) * 3.6m (Height) (±100mm).
2. ① External environmental noise: Len (A) ≤ 75dB (A). When there is no interference from abnormal low-frequency noise sources (such as ground pounding, piling, impact) around, and the air-conditioning and ventilation system is turned off with only the lights on, the background noise Lgn (A) in Semi-anechoic Chamber A is ≤ 15dB (A).
② External environmental noise: Len (A) ≤ 75dB (A). When there is no interference from abnormal low-frequency noise sources (such as ground pounding, piling, impact) around, and the air-conditioning and ventilation system is turned off with only the lights on, the background noise Lgn (A) in Semi-anechoic Chamber B is ≤ 18dB (A).
3. The net size of the acoustic gate: 2.6m (Width) * 2.4m (Height).
4. Cut-off frequency: Fc ≤ 100Hz.
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First ：Thanks to Suzhou Mtt Testing International Co., Ltd. for purchasing the semi-anechoic chamber project .
Next：Congratulations to Zhejiang Shuaikang for completing training of the NI-DC PULSE analyzer from us.
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