空气动力
空气动力学
Lift(数据挖掘)
物理
机械
惯性
角速度
不稳定性
经典力学
扭矩
风洞
计算机科学
热力学
数据挖掘
出处
期刊:Transactions of the American Society of Civil Engineers
[American Society of Civil Engineers]
日期:1950-01-01
卷期号:115 (1): 1180-1217
被引量:13
标识
DOI:10.1061/taceat.0006431
摘要
General equations are derived, expressing the aerodynamic forces of lift and torque on any oscillating section of two independent degrees of freedom. The parameters representing the distinctive aerodynamic characteristics of the section and the coefficients representing the variation with wind velocity are derived from static wind-tunnel tests on straight and curved section models. The effects of vertical velocity, angular displacement, and angular velocity are included, as well as the effects of the angle of incidence. The complete expressions for the aerodynamic forces are equated to the corresponding expressions for the dynamic forces acting on the section, including elastic (and gravitational) restoring force, inertia, and damping. The resulting general equations yield solutions for all practical problems of vertical, torsional, and coupled oscillations, including analytical determination and prediction of frequencies, critical velocities, instability response (rate of amplification), and amplitude response. Numerical examples are given, to illustrate the practical application of the derived relations and to confirm the validity of the underlying theory. Graphic methods are presented to facilitate application and visualization.
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