【摘 要】
：
The hoop flexible structure has light weight,great flexibility,weak damp and large size.These characteristics cause low natural frequency.The external excit
【机 构】
：
StateKeyLaboratoryforStrengthandVibrationofMechanicalStructures,SchoolofAerospace,Xi'anJiaotongUniv
【出 处】
：
The 5th Asian Conference on Mechanics of Functional Material
论文部分内容阅读
The hoop flexible structure has light weight,great flexibility,weak damp and large size.These characteristics cause low natural frequency.The external excitation can significantly affect the low frequency vibration.This paper investigates the active vibration control (AVC) of the hoop flexible structure with extended arm by using piezoelectric stack actuator.At first,the hoop flexible structure model is built by finite element software.The natural frequencies are calculated by usingmodal analysis.Then,PD algorithm,Fuzzy algorithm and least mean square (LMS) adaptive filtering algorithm are applied to derive the vibration control theory.Dynamics equation of the multi degree of freedom system is also established.Based on the piezoelectric stack,the moment actuator is designed.Ultimately,the excitation simulation and the closed-loop control simulation for suppressing the vibration are established.The simulation result illustrates that the amplitude of the vibration is decreased significantly under the external excitation after adopting the moment actuator and intelligent control algorithm.
其他文献
This work deals with the mechanical property of triaxial CFRP from low to high temperatures.We performed tensile tests on this composite at 100 K,room tempe
The coupled mode theory with coupling of diffraction modes and waveguide modes is usually used on the calculations of transmission and reflection coefficien
Ferroelectric thin films are usually grown on substrate with different lattice constants,and the misfit strain at thin film-substrate interface that is rela
Even inherently brittle hollow silicon nanoparticles (NPs) can withstand larger strain to failure than solid NPs.However,the influence of wall thickness on
Polarization switching induced by local mechanical force via flexoelectric effect has recently attracted great attention since it may enable applications in
Surface instabilities in bilayer systems composed of a thin,hard film bonded to a thick,soft substrate have been studied extensively in recent years both ex
The flexoelectric effect is coupling of polarization and strain gradient,which exists in wide variety materials and presents strong size-dependent at the na
Graphene is the thinnest,one-atom thickness material in nature,and has unique mechanical,electronic and optical properties.However,the small out-of-plane ri
In many engineering fields nowadays functionally graded materials (FGM) are used for structural applications.Functionally graded materials normally consist
Functionally graded materials (FGM) are finding various applications in different engineering fields due to gradual change of material properties through th