Acoustics-based centrifugal machine rotating speed non-contact measurement method and device
A non-contact, measurement method technology, used in measurement devices, linear/angular velocity measurement, velocity/acceleration/shock measurement, etc., can solve the problems of low accuracy of rotation speed prediction, inaccurate measurement of rotating structures, etc., and achieve response time. Short, maneuverable, high-efficiency measurements
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Embodiment 1
[0038] An acoustic-based non-contact method for measuring the rotational speed of a centrifuge, such as figure 1 shown, including the following steps:
[0039] Place an acoustic signal acquisition system next to the centrifuge;
[0040] When the centrifuge is stopped, the acoustic signal acquisition system is used to collect the acoustic signal to obtain the environmental background noise signal; when the centrifuge is running, the acoustic signal acquisition system is used to collect the acoustic signal to obtain the off-body generated by the airflow around the rotating arm or shaft cutting The aeroacoustic signal of the vortex;
[0041] Perform noise reduction processing on the aeroacoustic signal according to the environmental background noise signal, and convert the aeroacoustic signal after the noise reduction processing to the frequency domain;
[0042] Spectrum analysis is carried out, and the rotational speed of the centrifuge is converted according to the results of...
Embodiment 2
[0051] An acoustic-based non-contact measurement device for centrifuge speed, comprising:
[0052] The acoustic signal acquisition system is arranged next to the centrifuge 1, and is used for acoustic signal acquisition, including the ambient background noise signal when the centrifuge 1 stops and the aerodynamic force of the detached vortex generated by the cutting of the surrounding airflow by the rotating arm or shaft when the centrifuge 1 is running. acoustic signal;
[0053] Among them, the acoustic signal acquisition system includes a non-contact high-precision microphone sensor 2 and a data acquisition card 3, the microphone sensor 2 is arranged at a place 0.2m away from the centrifuge 1, the data acquisition card 3 collects the output signal of the microphone sensor 2, and the acoustic signal acquisition The acoustic signal collected by the system is sent to the data processing system.
[0054] The data processing system is connected with the acoustic signal acquisiti...
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