Equilibrium Characteristics and Stability Analysis of Helicopter with Rigid-Body Modeling Slung-LoadChinese Full Text
Wang Zhaorui;Cao Yihua;School of Aeronautic Science and Engineering,Beijing University of Aeronautics ＆ Astronautics;
Abstract: Based on rigid-body modeling slung-load hypothesis,a nonlinear dynamics model of the helicopter with slung-load coupling system is presented,and the rigid-body modeling slung-load brings in extra degrees of freedom and constraints,which makes the nonlinear equations of helicopter motion increase from 9orders to 19 orders.The nonlinear equations are linearized by small perturbation hypothesis and trimmed by continuation.Then the trimmed results are compared with the experimental data of helicopter flight and the calculation results of helicopter with mass-point modeling slung-load.The motion modes of helicopter with rigid-body modeling slung-load hypothesis are calculated with difference method,and the impacton stability of helicopter by extra slung-load is analyzed at the same time.Results show that the rigid-slung-load adds five new motion modes to the system,two of which about sling swinging are stable,three of which about slung-load attitude motion are unstable.Meanwhile,the introduction of slung-load makes the short period mode and the roll mode of helicopter unstable,which has a strong impact on the flight quality of helicopter.
- DOI：
10.16356/j.1005-2615.2015.02.018
- Series：
- Subject：
- Classification Code：
V212.4
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