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

Pending Publication Date: 2022-04-08
TONGJI UNIV
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  • Claims
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Problems solved by technology

In the prior art, someone proposed an acoustic rotational speed measurement method based on structural vibration. The basic principle is that the microphone device collects the audio signal of the rotating structural vibration, performs sampling analysis, and determines the rotational speed. However, this method is affected by the structural vibration of multiple components. The prediction accuracy of the rotational speed is not high, and at the same time, the rotational speed of the rotating structure is not accurately measured when the vibration is not obvious

Method used

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  • Acoustics-based centrifugal machine rotating speed non-contact measurement method and device
  • Acoustics-based centrifugal machine rotating speed non-contact measurement method and device

Examples

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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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Abstract

The invention relates to an acoustics-based centrifugal machine rotating speed non-contact measurement method and device. The method comprises the following steps: placing an acoustic signal acquisition system beside a centrifugal machine; when the centrifugal machine is shut down, acquiring an environmental background noise signal through an acoustic signal acquisition system; when the centrifugal machine operates, an acoustic signal acquisition system is used for acquiring an aerodynamic acoustic signal of a detached vortex generated when the rotating arm or the shaft cuts surrounding airflow; noise reduction processing is carried out on the aerodynamic acoustic signal according to the environment background noise signal, and the aerodynamic acoustic signal after noise reduction processing is converted to a frequency domain; performing spectral analysis, and converting to obtain the rotating speed of the centrifugal machine according to a spectral analysis result. Compared with the prior art, when the rotating speed of the closed centrifugal machine rotating at a high speed is measured, the existing structure of the centrifugal machine is not damaged, any part does not need to be installed in the centrifugal machine, the rotating speed can be accurately measured, and a basis is provided for professionals to detect or evaluate the rotating speed performance of the centrifugal machine.

Description

technical field [0001] The invention relates to the technical field of centrifuge rotation speed measurement, in particular to a non-contact centrifuge rotation speed measurement method and device based on acoustic measurement means. Background technique [0002] Centrifuge is a special equipment for rapid separation, concentration and purification of mixed substances with different densities, particle sizes and sedimentation coefficients through the centrifugal force generated by high-speed rotation. It is widely used in chemical, food, pharmaceutical, environmental protection, mining, teaching and other scenarios. [0003] The commonly used measurement methods for centrifuge speed are divided into photoelectric code disc speed measurement method, Hall element method, centrifugal test method, tachometer generator method, flash speed measurement method, magnetic flux leakage speed measurement method, etc. The photoelectric code disc speed measurement method needs to fix a ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/00G06F17/14
Inventor 季晨振王萌铭潘登
Owner TONGJI UNIV
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