Lecture2 - BIM 281 UC Davis, BME Acquisition and Analysis...

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Unformatted text preview: BIM 281 UC Davis, BME Acquisition and Analysis of Biomed. Signals Lecture 02 Recap: Fundamentals B.P. Lathi Linear Systems and Signals Representing signals Series ??? Sines and/or Cosines Complex representation(s) Overview Mechanical systems Overview Mechanical systems Overview “Howard_book_Chapter_02.pdf“ on course WEB site Examples B.P. Lathi Linear Systems and Signals Viscoelastic behavior: Combinations of “springs” and “dashpots” Low Reynolds number Typical values: density (water) viscosity (water) 1 centipoise = 1 mPa ⋅ s 1 Pa = 1 N m 2 size velocity (cytoplasm of white blood cells) ρw = 1kg = 103 kg m3 ⎧1.003 centipoise at 20°C ηH 2O = ⎨ ⎩0.891 centipoise at 25°C ⎧1000 Pa ⋅ s at 20°C ηcell = ⎨ ⎩ 100 Pa ⋅ s at 37°C L ∼ 10 μm v ≤≈ 100 nm s elastic element (“spring” viscous element (“dashpot”, “damper”) Viscoelastic behavior: Combinations of “springs” and “dashpots” Voigt-Kelvin element Viscoelastic behavior: Combinations of “springs” and “dashpots” Maxwell element ...
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