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中文摘要：
总结了换轨车换轨工作的六种典型工况。采用了三种方法计算换轨车换轨工作载荷并且建立了伸缩式换轨车换轨工作装置的理论模型。采用加速因子和惯性权重改进了的粒子群算法，并在其中加入了混沌算法，针对于伸缩臂六边形截面的5个主要参数进行优化。优化结果表明；伸缩臂质量降低了29．6％，整机质心位置下降，配以伸缩功能的配重也会较小，实现了换轨车前后转向架轴重的平衡，提高了换轨车整机稳定性。
英文摘要：
Summed up six typical working conditions of the rail track replacement device. Its working load is calculated by three kinds of method. And the theoretical model of telescopic rail track replacement car for work equipment is established. Accelerating factor and inertia weight Improved PSO,and adding the chaos algorithm optimize five main parameters of hexagonal cross-section telescopic boom. The optimization results show,telescopic quality has reduced by 29.6% ;overall centroid position has down; counterweight with telescopic functionis smaller; the balance of front and rear axle bogie track replacement has achieved;In other railcars improved machine stability.
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