Abstract
This work explores the influence of the swept sine constraint on instantaneous flow parameters in a variety of piping systems supplied with pulsating flows, as used for fluid transportation in process plants, in the power and chemical industries, compressed air system, and in automobiles. Continuous and sudden pulsation frequency changes occur due to start and stop procedures in industry piping systems or to changes in process parameters—increases or decreases in the frequency of the pulsation generating device. Understanding the instantaneous parameters of piping systems enables optimization according to the sweeping resonance frequency at the start-stop or changing frequency phases of the work. A test rig was prepared to research transitional states between changing pulsation frequencies in pipes under the so-called swept sine constraint. The results are presented of a series of measurements taken during various frequency change schemes corresponding to dynamic estimation procedures. The main flow parameters needed to evaluate pressure were measured at three control sections. The frequency change domain was also examined, in terms of initial and final values. The change in frequency was based on a ramp function. The measurement data were processed in a program created in Matlab/Simulink. Estimates were based on second-order inertial elements, and provided quite a good representation of the acquired data. Amplitude frequency characteristics under the influence of two dominant cases (sweeping up and down) were also estimated and compared using relative and absolute values.
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The author gratefully acknowledges the helpful comments and suggestions of the reviewers, which have improved this manuscript.
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Pałczyński, T. (2018). Impact of Frequency Change Rate on Instantaneous Flow Parameters in Pipes. In: Timofiejczuk, A., Łazarz, B.E., Chaari, F., Burdzik, R. (eds) Advances in Technical Diagnostics. ICTD 2016. Applied Condition Monitoring, vol 10. Springer, Cham. https://doi.org/10.1007/978-3-319-62042-8_32
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DOI: https://doi.org/10.1007/978-3-319-62042-8_32
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