No abstract

The article contains the results of a research by definition diagnostic parameters necessary for the development of an electroparametric method for monitoring of the shafts misalignment in centrifugal pumping units. An experimental research was performed using a overhung centrifugal pump unit K 20/30 and measuring equipment. In its turn is determined function of the dependence the relative amplitude of the informative harmonic in the spectrum of the current of the electric motor phase from the parameter of the overall vibration level of a centrifugal pump unit. This function makes it possible to set the values of the diagnostic parameter for the boundaries of the technical state zones of the pump unit, which correspond to the values of the parameter of the general vibration level, in the event of the shafts misalignment. In mathematical modeling of a centrifugal pumping unit, made imitation of mechanical defect on the shaft when changing the value of the relative pump head and operating parameters for multiple units. As a result of modeling were obtained regression equations of the dependencies of the diagnostic parameter on the parameter imitation of defect at different values pump head and for multiple units.

No abstract

No abstract

A b s t r a c tIn the work the analysis of the frequency characteristics of the measuring channels of a dual-input control system, and general frequency characteristics on example a dual input control system of dynamic increment of torque. The article shows that in mode of quasiresonance, the imaginary component of the frequency function becomes zero. This leads to the exclusion of the amplitude-frequency and phasefrequency distortions in the measurement channel. The calculation of the logarithmic amplitude-frequency characteristics of the entire system in mode of quasiresonance showed a complete absence of frequency distortion in a dual-input control system of dynamic increment of torque. Considered experimental logarithmic amplitudefrequency and phase-frequency characteristics in the absence of quasiresonance and if it in one of the measurement channels. It is shown that at frequencies less than resonance, the phase shift and amplitude of frequency distortion have positive values, while at frequencies above resonance -negative. The article presents the results of tests of a prototype of a dual input control system parameters torque on experimental wells in the company «Eltech», Usinsk, Komi Republic.