Abstract:

When the vibration frequency of the three cylinder fracturing pump coincides with the natural mode frequency during operation， the resonance phenomenon generated will intensify the vibration of the fracturing pump， causing severe fluctuations in the amplitude of the vibration displacement， thereby reducing the stability of the three cylinder fracturing pump operation. Therefore， a vibration frequency control algorithm for three cylinder fracturing pumps considering excitation peak values is proposed. By considering the combined effects of the natural modal frequency， namely the inertia force of the crank slider mechanism， the hydraulic wave force at the hydraulic end， and the frictional force， the excitation peak value of the three cylinder fracturing pump is determined. Using the FBLMS control algorithm， the error signal between the peak excitation value and the expected target value of the three cylinder fracturing pump is transformed in the frequency domain to obtain the response result of the vibration frequency. Then， FFT technology is used to determine the position of the vibration signal， and the vibration acceleration weight is updated based on the signal position to reduce the vibration displacement amplitude and achieve vibration frequency control of the three cylinder fracturing pump. The experimental results show that the algorithm effectively reduces the vibration amplitude of the three cylinder fracturing pump to about 0.1 μm， and improves the stability of the three cylinder fracturing pump operation.

Key words: excitation peak value, three cylinder fracturing pump, vibration frequency, FBLMS algorithm, FFT technology