Experimental Investigation and Mathematical Modelling of Pressure Transfer Function for Air Compressor

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    A mathematical model is developed to estimate the pressure response of an insulated electric air compressor. A pressure switch is modeled as a comparator and the electric motor as an amplifier. It is assumed that the compressed air is a perfect gas when applying the isentropic process. In addition, the effect of a step, ramp and sinusoidal functions of disturbance signals on the air pressure has been studied.  A good agreement was obtained when comparing the predicted results with the measured values obtained from the experimental test that was done using a (1.32 kW, 23 litter and 8 bar) electric reciprocating air compressor. In addition, the same behavior of the predicted results was obtained when compared with results of a previously published article. It was found that the time constant of this control system is directly proportional with the value of the spring constant that is inserted inside the pressure switch and with the volume of air storage vessel, and it is inversely proportional with the gain of the amplifier and with the effective cross-sectional area of the pressure switch diaphragm and it is independent of the value of operating pressure set point. In addition, when the value of disturbance signal is positive, it will increase the output pressure response and when it is negative, it will decrease it.

     



  • Keywords


    Integral controller; pressure response; air compressor; step function disturbance; ramp disturbance; sinusoidal disturbance.

  • References


      [1] Ali Reza Jamshid Nia, F. S. (2014) ‘Intelligent Control for Gas Collector Pressure of Coke Oven’, International Journal of Engineering and Technology Research, 2(1), pp. 1–14.

      [2] Andris Sniders and Toms Komass (2012) ‘Invariant Method of Load Independent Pressure Control in Steam Boiler’, Electrical, Control and Communication Engineering Journal, Faculty of Engineering, Latvia University of Agriculture, pp. 5–10.

      [3] Carolina V. Ponce, Doris Saez, Carlos Bordons, Alfredo Núnez (2016) ‘Dynamic simulator and model predictive control of an integrated solar combined cycle plant’, Energy, 109(August), pp. 974–986. doi: 10.1016/j.energy.2016.04.129.

      [4] Chiao-Ying Chang, Shih-Han Wang, Yu-Cheng Huang, Cheng-Liang Chen (2017) ‘Transient Response Analysis of High Pressure Steam Distribution Networks in A Refinery’, in 6th International Symposium on Advanced Control of Industrial Processes (AdCONIP). aipei, Taiwan: IEEE, pp. 418–423.

      [5] Chunyue PAN (2017) ‘Air Compressor Pressure Control System Based On Gearshift Integral PID Controller’, MATEC Web of Conferences, 139, p. 00199. doi: 10.1051/matecconf/201713900199.

      [6] Ekaterina Chukanova, Nikola Stosic, Ahmed Kovacevic (2013) ‘Experimental Investigation and Numerical Modelling of Dynamic Behaviour of Screw Compressor Plant’, Universal Journal of Engineering Science, 1(3), pp. 68–79. doi: 10.13189/ujes.2013.010302.

      [7] Francis H. Raven (1995) Automatic Control Engineering. 5th ed. New Delhi: McGraw-Hill.

      [8] Jian Zhao (1992) Simulation of Boiler Drum Process Dynamics and Control. McGill University, Montreal, Canada.

      [9] Katsuhiko Ogata (2010) Modern Control Engineering. 5th ed. New Jersey: Pearson Education, Inc., publishing as Prentice Hall.

      [10] Rong Panxiang, Han Leng, Li Chao (2011) ‘Research on the main steam pressure control system of boilers based on fuzzy PI control’, Proceedings of the 6th International Forum on Strategic Technology, IFOST 2011, 2, pp. 927–930. doi: 10.1109/IFOST.2011.6021172.

      [11] Sanford Klein, Gregory Nellis (2011) Thermodynamics. doi: 10.1017/CBO9780511994883.

      [12] Yiheng Zhou, Longyue Yang, Hailin Pu, Ziyu Zhao, Fei Liu, Zheng Chen (2012) ‘Boiler Steam Pressure Control System Based on Fuzzy Control’, Advanced Materials Research, 462, pp. 732–737. doi: 10.4028/www.scientific.net/AMR.462.732.

      [13] Yunis A. Cengel, Michael A. Boles (2015) THERMODYNAMICS: AN ENGINEERING APPROACH. 8th edn. Mc Graw-Hill Education.


 

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Article ID: 28076
 
DOI: 10.14419/ijet.v7i4.19.28076




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