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| Dynamic Modeling and Numerical Simulation ofAsymmetric Double Orbit Rocket Sled |
| Received:March 06, 2023 Revised:July 17, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.11.008 |
| KeyWord:asymmetric rocket sled sled-orbit coupling dynamic modeling numerical simulation dynamic characteristics |
| Author | Institution |
| ZHOU Xue-peng |
Southwest Institute of Technology and Engineering, Chongqing , China |
| DAI Xiao-qiang |
Southwest Institute of Technology and Engineering, Chongqing , China |
| YANG Zhen |
Norinco Group Test and Measuring Academy, China North Industries Group Corporation Limited, Xi'an , China |
| CHEN Yang |
Southwest Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| The work aims to take the high-speed asymmetric double orbit rocket sled system as the research object to establish a relevant dynamic model including the sledge-rail interaction and carry out numerical simulation on the dynamic characteristics within the whole orbit. Firstly, the composition and dynamic process of the rocket sled were clarified, and the force on the asymmetric double orbit rocket sled was analyzed to deduce and establish the coupling dynamic model of rocket sled and orbit. Secondly, the free mode of the rocket sled was analyzed, showing that the product sled mode was higher than the second stage thrust sled, and the second stage thrust sled mode was higher than the overall mode of the rocket sled. Finally, the aerodynamic time history curve of the rocket sled and the additional mass time history curve considering the mass loss of the rocket engine were obtained and theorbit irregularity model was reconstructedas the orbit excitation. On this basis, the dynamics software was used to analyze the dynamic characteristics of the rocket sled system. The acceleration of rocket sled increased with the increase of running speed and the vertical acceleration was greater than the lateral acceleration. The dangerous part of the rocket sled at high speed was on the side wing, where there was a risk of breaking. There was a phase difference between the vertical slippers of the rocket sled. The rocket sled was pitching vertically and swinging back and forth laterally, and the vertical dynamic response was about 1~2 times that of the lateral one. |
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