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Nonlinear modeling of a pulmonary waveform generator.
Reynolds JS; Stemple KJ; Petsko RA; Ebeling TR; Frazer DG
Ann Biomed Eng 2001 Oct; 29(Suppl 1):S-142
Pulmonary waveform generators consisting of motor driven piston pumps are commonly used to test respiratory function equipment. Gas compression within these generators can produce significant distortion of the output flow-time profile when testing peak expiratory flow (PEF) meters. The waveform generator with load (PEF meter connected at the generator output) was modeled as a time varying RC circuit, where resistance represents flow resistance of the pump load, and capacitance represents gas compliance in the pump chamber. Resistance and capacitance are time-varying parameters since R is a nonlinear function of flow, and C varies as a function of pump volume.
Models; Pulmonary-system; Respiratory-equipment; Gas-sampling; Compressed-gases; Compression-tests
Hochmuth RM; Reichert WM; Truskey GA
Annals of Biomedical Engineering
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