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Existence, Uniqueness and Asymptotic Behaviour for a Nonlinear Beam Equation

机译:一类非线性梁方程的存在性,唯一性和渐近性

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The use of perturbation methods for fourth order PDE's has not yet been examined extensively. Usually approximating power series are applied, which are truncated to one or two modes. Very little - or nothing - is said about the relation between this approximation and the exact solution. In this paper the following equation will be discussed: w_(tt) + w_(xxxx) + ε ( u(π, t) - u(0, t) + ∫_0~π w_x~2dx) w_(xx) = εg(x, t, w,w_t). This equation can be regarded as a model describing wind-induced oscillations of flexible structures like elastic beams, where the small term on the right hand side of the equation represents the windforce acting on the structure. Existence and uniqueness for solutions of these problems will be discussed, as well as finding approximations using a multiple time scales method. Finally the asymptotic validity of these approximations will be considered.
机译:对于四阶PDE,微扰方法的使用尚未得到广泛研究。通常应用近似的幂级数,将其截断为一种或两种模式。关于该近似值与精确解之间的关系,很少或根本没有说。本文将讨论以下方程式:w_(tt)+ w_(xxxx)+ε(u(π,t)-u(0,t)+∫_0〜πw_x〜2dx)w_(xx)=εg (x,t,w,w_t)。该方程式可以看作是描述诸如弹性梁之类的柔性结构的风致振动的模型,其中方程式右侧的小项代表作用在结构上的风力。将讨论这些问题的解决方案的存在性和唯一性,以及使用多个时间尺度方法寻找近似值。最后,将考虑这些近似的渐近有效性。

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