Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Implementation of The Fluid Circulation Blood Pressure Simulator

유체 순환 혈압 시뮬레이터의 구현

  • Kim, C.H. (Dept. of Electrical Engineering, Dong-a University) ;
  • Lee, K.W. (Dept. of mechanical Engineering, Pusan National University) ;
  • Nam, K.G. (Dep. of Electronics Engineering, Pusan National University) ;
  • Jeon, G.R. (Dep. of Biomedical Engineering, College of Medicine, Pusan National University)
  • 김철한 (동아대학교 전기공학과) ;
  • 이규원 (부산대학교 기계공학과) ;
  • 남기곤 (부산대학교 전자공학과) ;
  • 전계록 (부산대학교 의과대학 의공학교실)
  • Published : 2007.12.31
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Abstract

A new type of the fluid circulation blood pressure simulator was proposed to enhance the blood pressure simulator used for the development and evaluation of automatic sphygmomanometers. Various pressure waveform of fluid flowing in the pipe was reproduced by operating the proportional control valve after applying a pressure on the fluid in pressurized oil tank. After that, appropriate fluid was supplied by operating the proportional control valve, which enabled to reproduce various pressure wave of the fluid flowing in the tube. To accomplish this work, the mathematical model was carefully reviewed in cooperating with the proposed simulator. After modeling the driving signal as input signal and the pressure in internal tube as output signal, the simulation on system parameters such as internal volume, cross-section of orifice and supply pressure, which are sensitive to dynamic characteristic of system, was accomplished. System parameters affecting the dynamic characteristic were analyzed in the frequency bandwidth and also reflected to the design of the plant. The performance evaluator of fluid dynamic characteristic using proportional control signal was fabricated on the basis of obtained simulation result. An experimental apparatus was set-up and measurements on the dynamic characteristic, nonlinearity, and rising and falling response was carried out to verify the characteristic of the fluid dynamic model. Controller was designed and thereafter, simulation was performed to control the output signal with respect to the reference input in the fluid dynamic model using the proposed proportional control valve. Hybrid controller combined with an proportional controller and feed-forward controller was fabricated after applying a disturbance observer to the control plant. Comparison of the simulations between the conventional proportional controller and the proposed hybrid simulator indicated that even though the former showed good control performance.

Keywords

References

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