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设计了一种新型飞机机翼支撑平台,其主要结构为并联机构。该并联机构由动平台、静平台和两者之间3条相同的PRS支链组成,具有适用飞机机型多的优点,并研究了其尺度综合方法。在建立并联机构的静力雅可比矩阵基础上,提出当动平台所受外力和外力矩变化时,支链驱动力和约束力变化量的最大全域均值最小的静力学性能评价指标。同时兼顾具体工作实际给出约束条件,利用单调性分析的方法,研究了并联机构静力学性能和各约束条件随尺度参数的变化规律,进而寻求满足约束条件的最优尺度参数。最后通过算例验证了该尺度综合方法的有效性。
A new aircraft wing support platform is designed. Its main structure is parallel mechanism. The parallel mechanism consisting of moving platform, static platform and the same three PRS branches between the two has the advantages of more applicable aircraft models, and studies its scale synthesis method. On the basis of the static Jacobian matrix of parallel mechanism, the statistic index of static performance with the minimum global mean of branch driving force and restraining force variation is proposed when the external force and external moment suffered by the moving platform are changed. At the same time, taking into account the actual work of the specific constraints, the use of monotonicity analysis method to study the static mechanism of parallel mechanism and the variation of each constraint with the scale parameters, and then find the optimal scaling parameters to meet the constraints. Finally, an example is given to verify the effectiveness of the proposed method.