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MTG goes green - Green energy - Sound measurements on wind turbines
2020-06-18 03:38:47, Microtech Gefell GmbH
For the operation of wind turbines/WTGs, e.g., reliable statements on the acoustic characteristics of the planned systems are required. The operation of the WTG must not lead to unacceptable noise immissions. Therefore, knowledge of the acoustic parameters and noise behaviour is a prerequisite for responsible and optimal use of the WTG. The optimised system GF1 - WN1 is a tailor-made solution made in Gefell for the wind energy sector and beyond (e.g. for determining immission-relevant sound power levels outdoors, for measurements at power plants, construction sites, filter and cooling systems, etc.). The boundary layer and the weatherproof power supply unit are specially designed to detect sound emission from wind turbines with measuring microphones according to DIN EN 61400-11. Operation close to the ground avoids undesired influences of the measurement results by reflection from the ground. Low wind speed near the ground also reduces wind noise at the microphone. The newly developed ground plate and windscreen reduced to an optimum for function , handling and transportation. The GF1 design allows easy calibration with a sound calibrator. Together with the impregnated secondary windscreen, the primary windscreen ensures a broadband reduction of the induced wind noise at the microphone by 40dB. Due to the acoustic effect of the sound-reflecting boundary layer (ground plate coated with varnish) , the microphone sensitivity increases by 6 dB as inherent to its functional principle. Thus, an overall improvement of the signal-to-noise ratio of approx. 46 dB can be achieved. Suitable for use are class 1 measuring microphones with measuring capsules (frequency range from 20 Hz to at least 10 kHz), dry adapters and measuring preamplifiers (200 V or IEPE supply). The power supply unit MN921 provides an operating voltage for conventional (7-pin LEMO®) and IEPE measuring microphones. Operation is possible via accumulators, batteries or mains voltage.