仿昆扑翼飞行器的翅膀惯性力分析

用理论模化和仿真试验相结合的方法,研究了昆虫翅膀扑动产生的惯性力和惯性力矩.在昆虫扑翼飞行运动的仿生模拟基础上,研究了翅膀扑动过程中拍动幅度、拍动加(减)速周期、平动迎角和翻转加(减)速周期4个振翅运动参数对翅膀惯性力(矩)的影响.研究表明:微小尺度昆虫高频扑翅产生的惯性力幅值与气动力的幅值大致相当;昆虫翅膀的弦向转动惯量比展向转动惯量近似高一个数量级;翅膀拍动惯性力矩的影响远远高于翅膀转动惯性力矩的影响,而转动惯性力矩是可以忽略不计的;只要翅膀的拍动是对称的,就可认为翅膀的扑动是近似对称的;如果翅膀拍动对称的同时转动对称,就可认为翅膀的扑动是严格对称的,此时翅膀惯性力可以忽略. 

Inertia force of flapping wing in entomopter micro air vehicle

Inertia force and moments of flapping wing in insect flight were studied using the methods of theoretical modeling and simulation.The influence of stroke amplitude,stroke duration,mid-stroke angle of attack and flip duration on inertia force was studied by simulating the biological locomotion of insect flight.The study results show that: the magnitude of inertia force is almost equivalent to that of the aerodynamic force during the high frequency flap of small insect;the insect wing`s chord inertia is much higher than its spread inertia——higher by an order of magnitude;the influence of stroke moment of inertia is much higher than that of the flip moment of inertia,so the flip moment of inertia can be ignored;it's believed that the flap is almost symmetrical if the stroke is symmetrical and the flap is absolute symmetrical if the stroke and the flip are both symmetrical,then the inertia force can be ignored.How to design the control mechanic of insect-like flapping wing air vehicle to increase the symmetrical and eliminate the influence of inertia force was discussed at last.