Modeling and Analysis of the Dynamic Mass Characteristics of the Pilot-seat System during Ejection Process
The mass characteristics of pilot-seat system is an important factor affecting the trajectory and attitude control accuracy of the ejection seat.Due to the lack of dynamic mass characteristic models,the control law of ejection seat designed with static parameters may cause trajectory and attitude deviation in practical applications.Based on the six degrees of freedom motion model of ejection seat,this paper integrated the effect of weight change of rocket package,compression of the human spine,compression of seat cushion and the head and neck rotation,and further established a calculation model of the dynamic mass characteristics of the pilot-seat system during the ejection process.By analyzing the calculation results of three typical conditions,the rationality of the calculation model was demonstrated.Finally,this paper compared the differences in lifesaving results caused by applying dynamic or static mass characteristics.The model established in this paper can provide reference for the refined design of ejection seat control laws in the future.
ejection seatsejection lifesavingdynamic mass characteristicscenter of gravitymoment of inertia
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