The dynamic stall boundaries of a NACA 0012 airfoil oscillating in either the pure plunge
mode or in the combined pitch and plunge mode is computed using a thin-layer Navier-
Stokes solver. Unsteady flowfields are computed at the free-stream Mach number of 0.3, the
Reynolds number of 1• 106, and the Baldwin-Lomax turbulence model is employed. It is
found that the pure plunge oscillation leads to dynamic stall as soon as the non-dimensional
plunge velocity exceeds the approximate value of 0.35. In addition, the power extraction …

In the current study a variable speed pump controlled hydrostatic circuit where an
underlapped shuttle valve is utilized to compensate the unequal flow rate of a single rod
actuator is analyzed. Parameters of the shuttle valve are included in the system analysis,
rather than treating it as an ideal switching element as handled in literature. A linearized
model of the system is obtained. An inverse kinematic model, which calculates the required
pump drive speed for a desired actuator speed and given pilot pr...