Coupling Dynamic Analysis Of Large Deployable Structure

The natural frequencies of a large deployable antenna are low and dense because ofits large dimension, light weight and large flexibility. Dynamic analysis is needed toavoid the coupling motion between the satellite and the antenna.Firstly, the structural schemes of hoop-column antenna and hoop-rib antennaproposed before with the diameter30-meter are introduced. A simple method isdescribed to calculate self-balance prestress of cable net structure. The mathematicalmodels of the antennas are set up via ANSYS software, and self-balance prestress ofcable net structure are calculated.Then, on the base of static analysis, prestressed modal analyses of antennas arecarried out, and the aim is to observe the natural frequencies and mode shapes of theantennas. In the analysis process, parameter optimization and structural optimizationdesign are done, because the value of first natural frequency is too small.Prestressed dynamic response analyses of antenna-satellite systems are carried out,and the aim is to observe the natural frequencies, mode shapes, the amplitude-frequencycharacteristic of harmonic response, the power spectrum density of random vibrationresponse, the maximal resuming time of impact response.At last, the binding schemes of antenna in stowed status are described and thevibration analyses are carried out. The simple models of antenna in stowed status are setup via ANSYS software, and the model analyses and the vibration analyses are carriedout.Across the coupling dynamic analyses of antenna-satellite system in deploymentstatus and stowed status, we acquire the natural frequencies and the values of dynamicresponse. The results in this paper are useful for further attitude control of the satelliteand structural optimization design of the antenna.