Complex Structure Of The Impact Dynamics Analysis And Simulation

Impact is a kind of common phenomena widely seen in engineering projects and the impact course is a complicated dynamic response process with its particular dynamic characteristics, so the analysis and research of impact phenomena becomes very important in both theoretical and realistic engineering fields. To solve the questions in impact dynamics of complex structures, it is a highly efficient way to adopt the numerical simulation with the help of the combination of impact dynamics and finite element method. In this article, the author conducts the research on impact dynamics of complex structures in the following fields:Firstly, the author sums up relatively the basic theory of impact dynamics and comes out with the general analysis way and the process of solving, thus founding the theoretical base for numerical simulation. Then the author combines the basic equation of impact dynamics with finite element method and establishes the analysis method of complex structures under impact load.Secondly, the author conducts the dropping and impacting experiment and finite element simulation with a column-shaped thin-shell object. The experiment results are used to improve the finite element model and the improved simulation data conforms with experiment results satisfactorily; as a result, the aim of virtual reality combined simulation is achieved. Meanwhile, the experiment also proves the feasibility for simulation analysis.Thirdly, putting a complex structure-the life-saving ejection seat of military airplane as the example, the author establishes the finite element model to study impact dynamics of the ejection seat through the simulation method. By simulating different impact conditions, impact directions and damp parameters of both a simple and a complex model, the author analyses the response principles and potential failure type of the ejection seat, and finds out the weakness in structure designing and further helps improve or optimize designing after synthesizing these analysis results. This simulation method provides significant reference for the impact dynamics research on similar complex structures. Finally, the author concludes the general rules of impacts and the effect on impacts bydamp from the simulation research of structure impact dynamics. In complicated impacts, damp will consume energy, reduce the response peaks and relieve impact efficiency.