| During the process of transportation,satellite boxes experience sea,land and air.Land transportation is one of the largest amplitude environmental in the three transportation environment.when the external excitation frequency equal to one order natural frequency of the satellite,there will be a resonance,the resonance on satellite boxes will affect the service life of some components,cause fatigue damage.But it's difficult to adjust the natural frequency of satellite packing system,so this article aimed at the problem of transport packaging system carried out analysis,simulation and experiment.The theory of two degrees of freedom dynamic vibration absorber is deducted and analysised and the parameter is optimized.For the theory of undamped single-degree-freedom dynamic vibration absorber,the effect of mass ratio and frequency ratio on secondary resonance frequency was analyzed.The method to solve the equivalent mass of vibration damping system was proposed when the system was equivalent to single degree of freedom.A numerical optimization method for dynamic vibration absorber parameters was proposed.According to this optimization method,the relation between the quality ratio and the optimal frequency ratio and the optimal damping ratio was obtained.The influence of the quality ratio of the single degree of vibration absorber to the optimal damping effect was obtained.The finite element model of packing-satellite was established,the finite element modal analysis was carried for model and obtained the modal shape and the corresponding modal frequency which has the greatest influence on satellite packing modal.Position simulation analysis determine the position of dynamic vibration absorber which is used to the final installation,quality analysis determine the quality of dynamic vibration absorber.Simulation analysis on frequency and damping determines the scope of frequency and damping of the dynamic vibration absorber which is used to provide guidance to the test and design.Two forms of two degrees of freedom dynamic vibration absorber is used to the amplitude of vibration reduction of the system and the amplitude expression was deduced.Have summarized the parameters which affect the amplitude of the vibration system.Found the law of the fixed points of two degrees of freedom vibration absorber.The parameters of the two degrees of freedom vibrator were optimized,and the damping effect of the vibration absorber was compared with that of the single-degree-of-freedom vibration absorber.The results show that the two degrees of freedom dynamic vibration absorber can achieve better vibration effect than the single-degree-of-freedom vibration absorber.The two degrees of freedom absorber is applied to the simulation analysis of the vibration reduction system of the satellite transport package.According to the conclusion of the simulation analysis,the tensile and compressive steel wire rope dynamic vibration absorber is tested,summarized the change law of various parameters of the steel wire rope vibration isolator under the test conditions and feasibility in the design of dynamic vibration absorber.Carried out the experiment of die spring which is used to design undamped dynamic vibration absorber.Summarized the change law of various parameters of die spring which was the elastic element under the experimental condition.The metal rubber or silicone gaskets damping element and die springs,steel quality were combined into dynamic vibration absorber which was used to test and sums up the change law of various parameters about damping component.The dynamic vibration absorber was designed for the satellite packaging according to the simulation analysis and experiment. |
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