旋转部件在交通运输、风能发电等诸多领域具有重要作用。三维数字图像相关方法(Three-Dimensional Digital Image Correlation,3D–DIC)作为一种非接触光学测量手段,能够获取旋转部件在运转过程中的全场位移、变形及振动信息,从而为故...旋转部件在交通运输、风能发电等诸多领域具有重要作用。三维数字图像相关方法(Three-Dimensional Digital Image Correlation,3D–DIC)作为一种非接触光学测量手段,能够获取旋转部件在运转过程中的全场位移、变形及振动信息,从而为故障诊断、健康监测以及气动结构优化设计提供重要数据支撑。本文对近年来3D–DIC技术的发展与应用进行了全面综述。首先介绍了3D–DIC技术的基本原理及其针对旋转物体的变形测量系统;针对大角度旋转测量中出现的退相关问题,详细阐述了国内外学者在初值估计和形函数设计等方面所提出的改进。随后,通过若干典型应用案例,展示了该技术相较于传统变形测量手段的优势。最后,对该技术的应用前景和发展趋势进行了展望。展开更多
Traditional dynamic analysis of mechanical structures,often limited to individual beams or plates,fails to fully capture their dynamic behaviors.In systems where space and mass are constrained,such as the battery supp...Traditional dynamic analysis of mechanical structures,often limited to individual beams or plates,fails to fully capture their dynamic behaviors.In systems where space and mass are constrained,such as the battery support structures in electric aircraft,conventional absorbers and isolators are insufficient for effective vibration control.This study simplifies the battery support structure of electric aircraft as an integrated composite beam consisting of three interconnected beams,and investigated its structural dynamics properties and nonlinear vibration control under thermal conditions caused by battery heat.The nonlinear vibration control is performed using the Nitinol steel wire ropes(Ni Ti-ST),with nonlinear damping properties.The natural frequencies of system are determined using the Rayleigh-Ritz technique.Theoretical results are validated through both Finite Element Method(FEM)and hammer tests.Moreover,the dynamic equations are derived using the Lagrange method and discretized via the Galerkin Truncation Method(GTM).The Harmonic Balance Method(HBM)is used to evaluate the vibration responses of the integrated model,with further verification through the Runge-Kutta Method(RKM).The experiments are conducted to corroborate the theoretical analysis.The results show that the system frequency changes in stages with the increase of the stiffness of the integrated composite beam connection.Especially in the case of varying environments,as the temperature increases,the frequency of system will first increase to a certain maximum value and then gradually decrease.Furthermore,the NiTi-ST effectively reduces vibration in the integrated composite beam,particularly under varying temperatures and external excitations.展开更多
文摘旋转部件在交通运输、风能发电等诸多领域具有重要作用。三维数字图像相关方法(Three-Dimensional Digital Image Correlation,3D–DIC)作为一种非接触光学测量手段,能够获取旋转部件在运转过程中的全场位移、变形及振动信息,从而为故障诊断、健康监测以及气动结构优化设计提供重要数据支撑。本文对近年来3D–DIC技术的发展与应用进行了全面综述。首先介绍了3D–DIC技术的基本原理及其针对旋转物体的变形测量系统;针对大角度旋转测量中出现的退相关问题,详细阐述了国内外学者在初值估计和形函数设计等方面所提出的改进。随后,通过若干典型应用案例,展示了该技术相较于传统变形测量手段的优势。最后,对该技术的应用前景和发展趋势进行了展望。
基金supported by the National Natural Science Foundation of China(No.12272240)the Liaoning Revitalization Talents Program,China(No.XLYC2203197)。
文摘Traditional dynamic analysis of mechanical structures,often limited to individual beams or plates,fails to fully capture their dynamic behaviors.In systems where space and mass are constrained,such as the battery support structures in electric aircraft,conventional absorbers and isolators are insufficient for effective vibration control.This study simplifies the battery support structure of electric aircraft as an integrated composite beam consisting of three interconnected beams,and investigated its structural dynamics properties and nonlinear vibration control under thermal conditions caused by battery heat.The nonlinear vibration control is performed using the Nitinol steel wire ropes(Ni Ti-ST),with nonlinear damping properties.The natural frequencies of system are determined using the Rayleigh-Ritz technique.Theoretical results are validated through both Finite Element Method(FEM)and hammer tests.Moreover,the dynamic equations are derived using the Lagrange method and discretized via the Galerkin Truncation Method(GTM).The Harmonic Balance Method(HBM)is used to evaluate the vibration responses of the integrated model,with further verification through the Runge-Kutta Method(RKM).The experiments are conducted to corroborate the theoretical analysis.The results show that the system frequency changes in stages with the increase of the stiffness of the integrated composite beam connection.Especially in the case of varying environments,as the temperature increases,the frequency of system will first increase to a certain maximum value and then gradually decrease.Furthermore,the NiTi-ST effectively reduces vibration in the integrated composite beam,particularly under varying temperatures and external excitations.
