Joint effect evaluation method and system for anti-noise earplugs and earmuffs in workplace
A workplace, combined action technology, applied in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as poor protection and achieve the effect of removing subjective errors
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Embodiment 1
[0058] This embodiment discloses a method for evaluating the joint effect of noise-proof earplugs and earmuffs in a workplace, including:
[0059] Measurement of insertion loss in each frequency band of noise-proof earplugs: used to evaluate the protective effect of earplugs alone, and obtain the frequency band with good noise blocking effect.
[0060] Performed in a reverberation chamber using the B&K Artificial Head Simulator 4128C. During the test, the noise is first emitted from the non-directional sound source sounding body, and the PLUSE acoustic software is used to measure the sound pressure level of each frequency at the microphone when the artificial head simulator is not placed and the hearing protector is closed. Then insert the earplugs into the ear canals of the right ear simulator (4158) and left ear simulator (4159) of the artificial head, and ensure that the earplugs are located at the center of the end face of the microphone. Play the same noise, and use the ...
Embodiment 2
[0085] This embodiment discloses the application of the above method in the protection of hearing protectors in pumped storage power stations, specifically:
[0086] Noise detection of hydraulic turbines in pumped storage power stations:
[0087] In order to fully understand the noise situation of the pumped storage power station and evaluate the effectiveness of its noise protection equipment, the noises of different working conditions and places of a pumped storage power station were measured. The Danish B&K company's 2238 precision integral sound level meter is selected for the fixed-point noise intensity detection in the workplace. It is certified by the Institute of Metrology every year and calibrated before each use. During the test period, all units were operating normally, and protective facilities such as ventilation were operating normally. The operating results of each unit under the tested power generation and pumping conditions are shown in Table 5 and Table 6. ...
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