1. Pneumatic oscillator driven by an air source of constant pressure.
Pneumatic oscillator driven by an air source of constant pressure. (A) When the membrane is downward, air flows from the pressure source PS into a jar of volume V, but the tubing between the jar and the atmosphere is blocked. When the pressure P in the bottom chamber exceeds ΔP1, the membrane snaps upward and blocks air flow from the pressure source PS, and the jar vents to the environment. When P decreases below ΔP2, the membrane snaps downward, and the jar pressurizes again (movie S4). (B) Equivalent electrical circuit that represents the pneumatic feedback control. (C) Oscillations in the jar at PS = 11 kPa. (D) Rise time (tR) as a function of PS, with different V values. (E) Fall time (tF) as a function of PS, with different V values. Error bars in (D) and (E) show the SD of the mean over a 60-s measurement interval. H = 3 mm and θ = 87.5°.
Philipp Rothemund et al. Sci. Robotics 2018;3:eaar7986
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