“…The cross-sectional aerodynamic admittance can either be approximated as in Liepmann (1952), Davenport (1962), Irwin (1977), using for example analytical expressions derived for a thin airfoil (Fung 1969), or measured as in Lamson (1957), Holmes (1975), Walshe & Wyatt (1983), Jancauskas (1983), Jancauskas & Melbourne (1986), Kawatani & Kim (1992), Sankaran & Jancauskas (1992), Larose (1992), Sato et al (1994) and Bogunovic Jacobsen (1995), or evaluated indirectly (Grillaud et al 1991). Liepmann's approximation to Sears' function is the most commonly used form of the lift aerodynamic admittance of a thin airfoil in fully correlated gusts with sinusoidal #uctuations (Liepmann 1952):…”