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Method for quickly computing Bode plot and Nyquist plot of rotary mechanical vehicle starting and parking processes

A rotating machinery and fast calculation technology, which is applied to the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of large phase calculation errors, and achieve the effect of accurate vibration peak value and vibration phase, smooth curve, and fast calculation

Inactive Publication Date: 2012-10-10
XI AN JIAOTONG UNIV
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Problems solved by technology

This phase calculation method is more accurate for phase estimation at low speeds, and the phase calculation error is larger at high speeds

Method used

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  • Method for quickly computing Bode plot and Nyquist plot of rotary mechanical vehicle starting and parking processes
  • Method for quickly computing Bode plot and Nyquist plot of rotary mechanical vehicle starting and parking processes
  • Method for quickly computing Bode plot and Nyquist plot of rotary mechanical vehicle starting and parking processes

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Embodiment Construction

[0055] Introduction to the test bench: As shown in Figure 1, the flexible rotor test bench used in the algorithm in this invention is a structural schematic diagram of the Bently bench. A and B are the sections close to the rolling bearings. We define the section measured by sensors 1 and 2 as the A surface , the section measured by the sensors 3 and 4 is the B surface. C and D are disks fixed on the shaft, used as balance disks. The balance disk has 24 holes evenly distributed along the circumferential direction. The processing direction of the holes is the axial direction. Different masses can be added artificially in these holes. Unbalanced mass. 1 to 5 represent eddy current displacement sensors, of which 5 is used to measure the key phase signal, 1 to 4 measure the vibration signal of the rotor shaft, and 1 and 2, 3 and 4 are 90° to each other. At the same time, the direction where the sensors 1 and 3 are located is defined as the X direction, and the direction where the...

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Abstract

The invention discloses a method for quickly computing a Bode plot and a Nyquist plot of rotary mechanical vehicle starting and parking processes. The method is based on rotor vibration signals and key-phase signals, which are measured by an eddy current sensor, of the rotary mechanical vehicle starting and parking processes, and the Bode plot and the Nyquist plot of the vehicle starting and parking processes are quickly computed; and an integral computing process is based on Hilbert transform processing for the vibration signals of the vehicle starting and parking processes, and is combined with phase-retaining filtering processing for the vibration signals and extraction of periodic information in the key-phase signals, so that the Bode plot and the Nyquist plot of the rotary mechanical vehicle starting and parking vibration signals are quickly computed. Experimental data analysis results show that Bode plot and Nyquist plot curves computed by the method are smooth, vibration peak values and vibration phases which are obtained by the method are more accurate, phase computational precision is unaffected by rotation speed, and the method is a good method for computing Bode plots and Nyquist plots of rotary mechanical vehicle starting and parking unsteady signals.

Description

Technical field: [0001] The invention belongs to the field of non-stationary vibration signal processing in the field of state monitoring and fault diagnosis of rotating machinery, and particularly relates to a fast calculation method for Bode diagram / Nyquist diagram in the non-stationary process of starting and stopping of rotating machinery. Background technique: [0002] The start and stop of rotating machinery is an accident-prone stage during the operation of the unit. In this process, the unit has experienced an unsteady-state operation process, which contains a wealth of state information of the unit, which cannot be obtained in the conventional steady-state state. Research on the extraction and utilization of vibration information during the start-stop process of rotating machinery has an important guiding role in understanding the operating status of rotating machinery and the hidden faults of rotating machinery. It is also of great significance to extract and util...

Claims

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Application Information

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IPC IPC(8): G01H11/06
Inventor 张西宁郭金良吴婷婷徐进杰李兵
Owner XI AN JIAOTONG UNIV
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