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为研究鸟类翅膀展向变形对扑翼气动特性的影响,基于对鸟类翅膀变形的观察,分别用动静法和拉格朗日方程建立三铰扑翼的数学模型,并利用数值计算研究该模型.结果表明:使用NACA0004作为截面的三铰扑翼在对称扑动时能够产生净升力;随着中翼弹性系数比的增大,周期平均升力因数增大,但周期平均阻力因数不存在单调性;三铰扑翼比双铰翼的周期平均升力因数明显小;随着外翼弹性系数比的增大,周期平均升力因数和周期平均阻力因数也不存在单调特性.
In order to study the influence of bird wing deformation on the aerodynamic characteristics of flapping wing, based on the observation of the wing deformation of birds, the mathematical model of three-limb flapping wing was established by using the dynamic and static methods and Lagrange’s equations respectively. Model.The results show that the net lifting force can be generated by the symmetrical flutter with NACA0004 as the cross section, and the average lift coefficient increases with the increase of the midwing elastic modulus ratio, but there is no monotone The mean lift coefficient of the three hinges is much smaller than that of the double hinged wings. With the increase of the outer elastic coefficient ratio, there is no monotonic characteristic of the average lift coefficient and the average resistance factor of the cycle.