Study on the Effect of Reinforced Motorized Launch Vehicle form Structure on Its Stability
It is necessary to consider the external structure of the vehicle body in the design of anti ex-plosion reinforcement for launch vehicles,as there is a possibility of overturning and further more loss of combat capability due to the impact in an explosion field.In order to analyze the stability difference of the launch vehicle with different structures under the action of the shock wave,the shock tube was used to test the rectangular box,semi-circular box and isosceles trapezoidal box respectively,and the motion response of the box after impact was observed by high-speed photography.In order to obtain the expected shock wave overpressure at the shock nozzle,the flow field inside the explosion-driven shock tube was simulated by using AUTODYN and verified by comparing with the test results,and the empi-rical formula for the overpressure of the explosion-driven shock tube was fitted by the simulation data.The impact test shows that the semicircular box in the explosion field has a stronger advantage against translational displacement than the rectangular box under the condition of smaller mass;and the isosce-les trapezoidal box has a greater resistance to overturning than the rectangular box under the condition of smaller mass.In the reinforcement design of the launch vehicle,the use of isosceles trapezoidal cross-section structure will have better stability against overturning than the traditional rectangular cross-section structure under the condition of smaller mass.
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