剪刀式桥梁展桥机构铰点位置多目标优化设计

阐述一种新型剪刀式桥梁展桥机构的工作原理。针对方案样机在架设初始状态时展桥机构驱动油缸小腔受力过大、引起间断液压油溢流问题，利用Denavit-Hatenberg齐次变换矩阵建立展桥机构的运动学和静力学模型。根据展桥机构驱动油缸闭锁力与驱动力不同的特点，提出确定剪刀式桥梁展桥机构关键铰点位置的多目标优化计算方法。对剪刀式桥梁方案样机展桥机构的关键铰点位置进行优化设计，利用机械系统动力学分析ADAMS软件进一步验证了优化计算模型。研究结果表明：优化后展桥油缸的最大拉力降幅达59.5%，展桥油缸的受力分布趋于合理；所提出的展桥机构计算模型正确；优化方法具有收敛速度快、稳定性好等特点；展桥机构优化计算结果为方案样机改进提供了依据。

Multi-object Optimization Design of Hinge Point Location of a New Deployment Mechanism for Scissors-type Bridge

A new deployment mechanism of scissors-type mobile bridge is presented. For the intermittent hydraulic oil overflow in driving cylinder cavity of engineering prototype due to overload during initial deploying, an optimal method for improving the stress state of driving cylinder is proposed. The kinematics and statics models of deployment mechanism are established using Denavit-Hatenberg homogeneous transformation matrix. A multi-objective optimization model for designing the location of hinge point in deployment mechanism is constructed based on different characteristics of driving force and locking force of hydraulic cylinder. The key hinge point location of deployment mechanism was optimized for the engineering prototype, and the correctness of calculation model was proved by using ADAMS. The research result shows that the maximum pulling force of optimized hydraulic cylinder is reduced by 59.5 percent, and the force distribution of hydraulic cylinder is significantly improved; the proposed calculation model is correct, and the optimization method has quick convergence speed and steady performance.