| Citation: | YAN Panyun, LIANG Guozhu, LYU Yongzhi, et al. Fast simulation on rigid multibody dynamics for vehicular cold launch systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(1): 71-78. doi: 10.13700/j.bh.1001-5965.2016.0071(in Chinese)
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In order to meet the rapid analysis requirements of launch dynamics, the absolute coordinates method of rigid multibody dynamics was used to fit the characteristics of complex constraints and changing topological structure of the vehicular launch systems. A fast simulation model with nine degrees of freedom was established and applied for typical vehicular cold launch systems. By comparing with ADAMS and ABAQUS, it shows that the maximum deviation of the loads of the rear outrigger is less than 4%, the consumed time is 7.1% of ADAMS and 0.004% of ABAQUS, and the current simulation model is effective and convenient to simulate the system dynamic characteristics. An actual example was adopted to investigate the dynamic characteristics of the load ratio of launch tube base-chassis outrigger and the influences on the average load ratio and the maximum displacement of launch tube mouth from an adjunctive load distribution factor. The results show that the load ratio of launch tube base-chassis outrigger increases gradually and then keeps constant approximately in the ejecting process, the adjunctive load distribution factor determines the load distribution proportions between the launch tube base and chassis outrigger by which the interior ballistic pressure load in the tube is transmitted to the ground, and the most suitable adjunctive load distribution factor exists which makes the disturbance on the system caused by missile ejection motion least.
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