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arXiv 0705.0614math.OC
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欧拉弹性问题中的麦克斯韦地层

Maxwell strata in Euler's elastic problem

Yu. L. Sachkov

摘要:

本文将端点和端点切线均为固定的弹性杆的定常位形的经典欧拉问题,看作二维平面$\E(2)$运动群上的左不变最优控制问题。描述了可达集,证明了最优控制的存在性和有界性。在$\E(2)$余切丛的纤维上的数学摆的流动所引起的自然坐标的Jacobi椭圆函数的参数化的矩阵。研究了欧拉问题在摆的相空间中由反射产生的离散对称群。通过对这组不动点的研究,完整地描述了相应的Maxwell点.由此得到了欧拉问题中割点的一个上界。

英文摘要:

The classical Euler's problem on stationary configurations of elastic rod with fixed endpoints and tangents at the endpoints is considered as a left-invariant optimal control problem on the group of motions of a two-dimensional plane $\E(2)$. The attainable set is described, existence and boundedness of optimal controls are proved. Extremals are parametrized by Jacobi's elliptic functions of natural coordinates induced by the flow of the mathematical pendulum on fibers of the cotangent bundle of $\E(2)$. The group of discrete symmetries of Euler's problem generated by reflections in the phase space of the pendulum is studied. The corresponding Maxwell points are completely described via the study of fixed points of this group. As a consequence, an upper bound on cut points in Euler's problem is obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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