Approach To Shape,Deformation And Stiffness Of Insect Wing By Experiment

During flight,insect wing undergoes large flexible deformation.The wing deformation remarkably enhances lift generation and flight control.The wing deformation has close relationship with aerodynamic force,inertial-elastic force and wing stiffness.As the wing is complex passive structure,the stiffness distribution is very complicated.Although previous researchers have measured the Young’s modulus of wing components and stiffness distribution along spanwise and chordwise,the spatial distribution of stiffness has not been accurately measured.In order to acquire stiffness field,we need to measure static deformation field first.Meanwhile,a fine measurement of wing shape is a first step to acquire static deformation field.My main research work is to measure shape,deformation and stiffness distribution of insect wing by experiment.The research work could be divided into four parts.The first part is to assembly a platform for measuring shape and deformation of insect wing.The platform,armed with line laser,co-axial LED and micro-force probe,could measure wing shape and load condition.The platform has advantage of high speed scanning,being versatile to different kinds of wings and no damage to bioactivity.The second part is wing shape measurement.The wing is scanned by laser and a series of laser images are generated.The wing shape could be acquired by light stripe center extraction from laser images.The wing shape is recorded in cloud point data.NURBS surface,a model which is more easily for analysis could be obtained by reverse engineering software.Both point cloud data and NURBS surface could shows wing contour,corrugation and vein pattern clearly.The third part is wing deformation measurement.The wing undergoes static deformation under concentrated force and lightened by laser and LED alternatively.Thus the laser image and LED image are obtained,which records shape and surface detail information respectively.By combination of triangulation and image matching method,the deformation field is obtained.The forth part is designing optimization algorithm to estimate stiffness distribution based on finite element analysis.The stiffness distribution could be found by comparing wing shape after deformation in experiment and simulation.This algorithm has the advantage of high speed,high accuracy and step variant.