Measurement And Research Of Insect Wing Stiffness Distribution Based On Optimal Method

Aerodynamics of flights biology has been researched.According to the principle of bionics,various flapping-wing micro air vehicles are designed.The flapping flight has many scientific problems to be studied.At present,there are two key research directions: one is the flapping-wing movement mode of insects with multiple degrees of freedom;the other is the flexible deformation of insect wings in flapping-wing movement.This paper focuses on the deformation of insect flexible wing surface.Current research focuses on the biological structure and material properties of wings.Due to the complex structure and the diversity of biological materials,the flexible deformation of insect wing is converted to the inverse mechanical problem of stiffness distribution.Based on the optimization of the inverse mechanical problem,this paper studies the flexible distribution of insect wings in two-dimensional plane,which will provide a theoretical reference for the development of artificial wings.In this paper,we mainly study the solutions to inverse problem of the insect wing stiffness distribution.Firstly,an experimental platform of scanning insect wing surface topography and mechanical testing was built to measure the insect wing deformation field.Then,the natural frequencies of insect wings are measured and a wings simplified model is established,based on high-speed photography.Finally,in the Abaqus environment,the genetic optimization algorithm of equivalent stiffness is developed using Python language to calculate the flexible distribution of the wing surface.We calibrate and validate the experiment and algorithm of this method,which proves the feasibility and reliability of this method for measuring stiffness distribution.In this paper,the equivalent stiffness distribution of termite wing is measured.The results show that the equivalent stiffness of the main vein(leading edge of wing)is 2-3 orders higher than the trailing edge in chord direction.And the equivalent stiffness of the wing tip is lower than the wing root in span direction.This result matches the research in the literature.This method can not only calculate the equivalent stiffness distribution of insect wings,but also be applied to other flexible films.