Weihai Clett Air Blower Co., Ltd. has purchased the large semi-anechoic chamber project with wind tunnel from our company. Summary: Weihai Clett Air Blower Co., Ltd. is a high-tech enterprise engaged in the design, research and development, production and manufacturing of ventilation and air treatment system equipment and accessories such as ventilators and ventilation cooling systems. Its main business is the research and development, production, sales and related maintenance services of ventilation equipment products and systems in the middle and high-end equipment industries such as rail transit ventilation cooling equipment, energy ventilation cooling equipment, marine engineering and ship fans, cooling tower and air cooler fans, and refrigeration fans.
They chose to cooperate with GZ DP Anechoic T?&E Co., Ltd. because Guangzhou Danpin Artificial Environment Technology Co., Ltd. is composed of a team of acoustic experts and professional engineers who have been engaged in various acoustic technology research at home and abroad for many years and have rich theoretical and practical experience. It owns its own office building and factory, and an acoustic laboratory that meets the CNAS standards has been built in the factory, which can monitor the acoustic technical indicators of its own products and provide external acoustic testing services. Through the hard work and continuous innovation and development of the Danpin team, the acoustic laboratories designed, produced and installed by it have products with accurate technical indicators, being environmentally friendly, durable in quality, beautiful in appearance and high in technological content.
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 simple introductions to the specific acoustic design, manufacturing, construction, installation and on-site actual measurement and acceptance of anechoic chambers, echo-free chambers, silent chambers, reverberation chambers, semi-anechoic chambers, semi-echo-free chambers, fully anechoic chambers and fully echo-free chambers, please pay attention to browsing theproject cases on the official website of the company, or scan thethe QR code of the WeChat public service account of the company to get free push notifications. For detailed information on anechoic chambers, echo-free chambers, silent chambers, reverberation chambers, semi-anechoic chambers, semi-echo-free chambers, fully anechoic chambers and fully echo-free chambers, please go to the download center on the official website of the company to download for free.
II. Procurement Content
1. Semi-anechoic chamber with wind tunnel
III. Standards Referenced
(1) GB 6882-2016 "Acoustics - Determination of Sound Power Levels of Noise Sources - Precision Methods for Anechoic Rooms and Hemi-anechoic Rooms";
(2) ISO 3745-2012 "Acoustics - Determination of Sound Power Levels of Noise Sources - Precision Methods for Anechoic Rooms and Hemi-anechoic Rooms";
(3) JJF 1147-2006 "Calibration Specification for Acoustic Characteristics of Anechoic Rooms and Hemi-anechoic Rooms";
(4) GB/T 3767-2016 "Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Pressure - Engineering Methods for an Approximately Free Field over a Reflecting Plane";
(5) GB/T 34877.3-2017 "Industrial Fans - Determination of the Sound Power Level of Fans under Standard Laboratory Conditions - Part 3: Enveloping Surface Method";
(6) GB 50243-2016 "Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Works";
(7) GB 50034 "Standard for Lighting Design of Buildings";
(8) GB 8624 "Classification for Burning Behaviour of Building Materials and Products";
(9) GB/T 18883 "Indoor Air Quality Standard";
(10) GB/T 1236-2017 "Industrial Fans - Performance Testing of Standardized Air Ducts";
(11) "Handbook of Noise and Vibration Control Engineering" - Edited by Ma Dayou, China Machine Press. Through the requirements of the above acoustic-related standards, correctly determine and analyze the noise characteristics of products to determine the noise levels of products and take corresponding measures to reduce product noise and improve product quality.
IV. Project Content
(1) The steel structure frame will be built on the top, which will be the responsibility of our company;
(2) The effective internal net dimensions of the semi-anechoic chamber installation project: 13.9m ± 100mm (L) * 12.9m ± 100mm (W) * 8.1m ± 100mm (H).
V. Main Terms for Acceptance of Semi-anechoic Chamber Products:
(1) When there is no abnormal interference in the surrounding environment (such as ground pounding, piling, impact, etc.), the background noise Lgn(A) in the semi-anechoic chamber should be ≤ 30dB(A);
(2) Cut-off frequency: Fc ≤ 63Hz.
(3) The net dimension of the equipment door is: outer acoustic gate: 4m (W) * 3m (H).
(4) The net dimension of the personnel access door is: 1m (W) * 2m (H).
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