Pulse time sequence torsional vibration measurement method based on magnetic field focusing
A technology of magnetic field focusing and pulse timing. It is applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, and using electromagnetic means. It can solve the problems of low precision and large magnetic flux leakage, and achieve the effect of improving large magnetic flux leakage.
Pending Publication Date: 2021-04-09
NORTHEAST FORESTRY UNIVERSITY
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[0005] In order to solve the problem of large magnetic flux leakage and low precision of traditional electromagnetic sensors, the present invention provides a pulse sequence torsional vibration measurement method based on magnetic field focusing. The present invention provides the following technical solutions:
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[0042] according to Figure 1 to Figure 8 As shown, the present invention provides a pulse timing torsional vibration measurement method based on magnetic field focusing:
[0043] A pulse timing torsional vibration measurement method based on magnetic field focusing, comprising the following steps:
[0044] Step 1: The excitation coil passes high-frequency AC current, and an alternating magnetic field is generated in the space. According to the spatial distribution of the excitation coil, the magnetic field is focused on a point on the axis through a permanent magnet probe to obtain a level signal;
[0045] The step 1 is specifically:
[0046] The permanent magnet probe makes the magnetic field focus on a point on the axis, and rotates with the axis. When the magnetic focus point is inside the rectangular receiving coil, due to the change of the magnetic flux inside the receiving coil, an induced voltage is generated on the receiving coil; the receiving coil is rectangular, a...
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The invention relates to a pulse time sequence torsional vibration measurement method based on magnetic field focusing. The invention relates to the technical field of instrument torsional vibration measurement, and the method comprises the steps: enabling an excitation coil to be electrified with a high-frequency alternating current, generating an alternating magnetic field in space, enabling the magnetic field to be focused at one point in an axis through a permanent magnet probe according to the spatial distribution of the excitation coil, and obtaining a level signal; collecting the pulse interval of the excitation coil, and determining the indexing angle of every two adjacent coils; and respectively determining an instantaneous angular velocity and an average angular velocity according to the indexing angle, and determining a torsional vibration angular velocity according to the instantaneous angular velocity and the average angular velocity. High and low level signals are measured by utilizing the focusing magnetic field principle, and the defects that a traditional electromagnetic sensor is large in magnetic flux leakage and low in precision and a photoelectric sensor is not suitable for severe working conditions are overcome. The flexible circuit board is adopted to print the receiving coil and is adhered to a measured shaft, so that the problems that an equant fluted disc is not easy to install under complex working conditions and the dynamic balance of the shaft system is influenced are solved.
Description
technical field [0001] The invention relates to the technical field of torsional vibration measurement of instruments and meters, and relates to a pulse sequence torsional vibration measurement method based on magnetic field focusing. Background technique [0002] Torsional vibration is extremely destructive. In recent years, the most common method for measuring torsional vibration is the pulse timing method. The pulse timing method can be divided into two types according to the type of indexing device or sensor: [0003] 1. Magneto-electric pulse timing method: Install an equal-split toothed disc on the measured shaft, measure the equal-split toothed disc by an electromagnetic sensor, and obtain high and low level pulse signals. Disadvantages: In complex working conditions, it is difficult to install the equally divided toothed disc on the measured shaft, and it will affect the dynamic balance of the shaft system. The magnetic force lines of traditional electromagnetic sens...
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IPC IPC(8): G01H11/02
CPCG01H11/02
Inventor 李志鹏邱枫张超王崇茂王博男
Owner NORTHEAST FORESTRY UNIVERSITY