Method and device for acquiring and analyzing rotor vibration signal of variable-rotation wind generation set

Abstract

The invention relates to a method and a device for acquiring and analyzing a rotor vibration signal of a variable-rotation wind generation set. The device comprises a vibration sensor, a rotation sensor, an acquisition unit and an analysis module. The method comprises the following steps of: synchronously acquiring rotation a pulse signal and an vibration signal at equal time interval; positioning the time sequence of a pulse rising or falling edge, calculating a rotation sequence based on the time sequence, dividing the corresponding vibration signal into vibration signal ranges according tothe pulse sequence and intercepting vibration signal sequence of the full rotation period of an wind wheel; and performing the interpolation complex sampling of vibration signal sequences of all fullperiods, prolonging the time of the vibration signal obtained by complex sampling at a specified rotation speed, obtaining the continuous vibration signal of the full period at the specified rotationspeed, and performing spectrum analysis. By the method and the device, a waveform spectrum which can facilitate analysis can be obtained, and basis is provided for the rotor vibration signal analysisand fault clearance of the wind generation set.

Description

technical field [0001] The invention relates to the technical field of vibration testing and signal processing, in particular to a method and device for data acquisition and analysis of vibration signals of a wind turbine rotor with variable speed and variable working conditions. Background technique [0002] The wind turbine is a rigid-flexible coupled multi-body system, and its power source is natural wind energy with strong randomness and discontinuity. Alternating loads such as aerodynamic force, inertial force and elastic force acting on the wind turbine will cause deformation and vibration of the wind turbine, which will affect the normal operation of the wind turbine and cause damage to the wind turbine in severe cases. [0003] The data acquisition and analysis devices currently used are all general-purpose devices. The data acquisition mainly completes the data recording, and performs routine processing such as anti-aliasing filtering. The data analysis integrates v...

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Problems solved by technology

[0004] The wind turbine rotor operates at low speed (generally <20rpm) and dynamic load, and the speed is unstable. It operates under variable working conditions for a long time, and the operating conditions are different from ordinary rotating machinery. Therefore, it is difficult for conventional data acquisition and analysis devices to effectively collect and analyze The characteristic information in the rotor vibration of the wind turbine, which brings difficulties to the analysis and fault diagnosis of the rotor vibration signal of the wind turbine

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