The Propagation Property And Energy Distribution Of Micro-Vibration Wave In Connection Structures Of Honeycomb Plates

The micro-vibration exists in the environment of space extensively and universally,which has a strong impact on the safety of satellites due to the micro gravity and the low damping condition.In this paper,two typical kinds of connection structures in satellite are investigated in detail,through analyzing the influence of arranged vibration isolation masses in structure joint on energy distribution of the whole structure with the purpose of providing effective basis for engineering application.There are two kinds of connection structures studied in this dissertation,one is linear connection structure and the other is L-style connection honeycomb structure.Firstly,the paper analyses the recent advances in micro-vibration isolation and introduce the research status of block isolation technology.It is meaningful to research the block isolation method,because this method isn't used in the aerospace widely.Secondly,the equivalent processing of honeycomb structure is illustrated in this chapter,which is benefit to solve the problem of the energy distribution in the honeycomb connection structures.The result of three equivalence theories shows that honeycomb plate equivalence theory is same as the sandwich theory and the thickness of plate based on Hoff theory is different.Comparing with several different equivalence theories,such as honeycomb equivalence theory,Hoff equivalence theory and sandwich plate theory,the honeycomb equivalence theory based on the Hamiltonian dynamics is the most suitable method to deal with the dynamic problems.Thirdly,the transmission characteristics of micro-vibration waves in two kinds of connection structures are investigated in this chapter.The results show that when the external excitation are flexural waves,there are only flexural waves in the linear connection structures.However,in addition to the flexural waves,a small amount of longitudinal waves are observed in the L-style connection structures because of the angles between two honeycomb structures.In both kinds of connection structures,the isolation frequency and transmission frequency are relevant t o the structure itself.Finally,energy distribution in the two typical connection structures is researched.To describe it clearly,the energy finite element method is adopted to investigate the structure property.According to the situation of energy dis tribution,the relationship between the isolation performance and the incent wave frequency or the size of the mass block is analyzed qualitatively.In addition,the isolation performance of the two typical connection structures is evaluated,indicating that the effect of mass block will be reduced when the incent frequency is close to the resonant frequency and the isolation performance will be more effective with bigger mass block.