RESEARCH ON THE PNEUMATIC LINE LENGTH IMPACT ON THE DYNAMIC PRESSURE MEASURING SYSTEM CHARACTERISTICS
DOI:
https://doi.org/10.18372/2306-1472.75.13117Keywords:
amplitude-frequency characteristics, bandwidth, damping ratio, dynamic gradation, phase shift, phase-frequency characteristics, pneumatic line, pressure sensor, time constantAbstract
Purpose: to do research on the pneumatic line length impact on the bandwidth of the useful signal and phase shift. Method: the processing of experimental data was carried out in MatLab environment, where was constructed the model of transient characteristic, and by using model was determined amplitude-frequency and phase-frequency characteristics. Results: the paper considers the experimental results regarding the dynamic calibration of the pressure measurement systems. This system consists of a pressure sensor and a pneumatic line that connects the sensor and the inlet pressure receiver. As a result of research, the amplitude-frequency and phase-frequency characteristics of the measuring system were obtained for different values of the pneumatic line. The paper also specifies the recommendations how to select lengths of the pneumatic line from the pressure receiver to the sensor when measuring pressure pulsations. Conclusion: for the Motorola MPXV5004DP sensor, the studies have been carried out in order to determine the impact of the pneumatic line length on the bandwidth and phase shift. During research, specific interrelations have been obtained. By means of these interrelations, it is possible to estimate the limiting transmission frequency and the phase lag of the measuring system. The obtained data allow to provide the correct planning of the experiment and to perform the high quality experiment on the investigation of the dynamic characteristics of the flow interacting with the streamlined object.
References
Tijdeman H., Spiering R.M.E.J.(2003) [A system for unsteady pressure measurements revisited]. International forum on aeroelasticity and. Structural dynamics. Amsterdam, June 4-6, 2003., (In Nederland)
Fisher A., Watkins S., Watmuff J. (2012) Dynamic Calibration of Pressure Measurement Systems:An Improved Method. Australia 18th Australasian Fluid Mechanics Conference
Žagar T., Kutin J., Bajsić I.(2007) The effect of connecting-tube dimensions on dynamic characteristics of pressure measurement systems, Ventil 11(3), pps. 161-165 (in Slovene).
Bajsic, I., Kutin, J. & Zagar, T. (2007) The response time of a pressure measurement system with a connecting tube. Instrumentation Science and Technology, no. 35, pp. 399–409. doi: 10.1080/10739140701436579
Lokar T., Smrečnik A., Bajsić I. (2000) [Generating dynamic pressure with loudspeakers]. [16th IMEKO World Congress, “Austrian Society for Measurement and Automation”], Vienna, pps. 109-113 (in Austria).
Motorola, Sensor Device Data Book. Available at: https://www.ecse.rpi.edu/Courses/CStudio/data%20sheets/DL200.pdf (accessed 01.2003).
PXC, Operation manual for the micromanometer. Available at: https://rhs.com.ru/ micromanometr-mmn-2400
National Instruments, NI-DAQmx Express VI Tutorial. Available at: www.ni.com/whitepaper/2744/en.
Ronald W. Larsen (2011) LabVIEW for Engineers. New York, Prentice Hall PTR Publ., 2010. 352 p.
Rukovodstvo pol'zovatelia. Matlab 7.12.0’ [User's Guide. Matlab 7.12.0]. Available at: http://www.mathworks.com/ (accessed 30.05.2013).
Lagarias J.C., Reeds J. A., Wright M. H., Wright P. E. (1998), Convergence Properties of the Nelder-Mead Simplex Method in Low Dimensions. SIAM Journal of Optimization, Vol. 9 No 1, pp.112-147.
Lazarev Yu. (2005) Modeliruvanie procesov i sistem v MatLab [Modeling of processes and systems in MATLAB]. Kyiv, 512p.).
