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Based on the double pendulum and Lagrange equation, the moving particles arecaptured by a binocular three-dimensional capture camera. Two trajectory modelsof Astrojax and the relationship between trajectory empirical formula andparameters are established. Through research, the calculated trajectory of thisformula and related parameters fit well with the actual measured trajectory,and can accurately predict and change the trajectory of the model. Theequipment and materials required in the experiment are simple and easy toobtain, and the experimental theme is relatively interesting and novel, whichcan be applied as an extended experiment in college physics experiment course,so that students can understand the motion characteristics of the doublependulum and learn physics from life. The designing experiment can not onlyimprove students' interest in learning, but also broaden their knowledge andcultivate their practical ability.

Research and experimental design of Astrojax double balls trajectory based on double pendulum system