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发表于 2014-10-25 21:04:29
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来自 日本
没有注意到关于弱形式还有这么多说法,学习了!
我的见解:是不是把焦距拉远一点来看。因为强形式,弱形式的说法实际上是个数学概念,看看数学家的说法要可靠的多(上述Bathe,Cook都应该是偏应用的)。比如说wiki上说
In a weak formulation, an equation is no longer required to hold absolutely (and this is not even well defined) and has instead weak solutions only with respect to certain "test vectors" or "test functions".
In mathematics, a weak solution (also called a generalized solution) to an ordinary or partial differential equation is a function for which the derivatives may not all exist but which is nonetheless deemed to satisfy the equation in some precisely defined sense
在http://math.stackexchange.com/qu ... d-weak-formulations有更详细的讨论(公式太多,我就不拷贝了)
在iMechanic(http://imechanica.org/node/13788),Akumar这样解释ZienKiewicz & Taylor和Cook
Weak form means, instead of solving a differential equation of the underlying problem, an integral function is solved. The integral function implicitly contains the differential equations, however it's a lot easier to solve an integral function than to solve a differential function. Also, the differential equation of system poses conditions that must be satisfied by the solution (hence called STRONG form), whereas, the integral equation states that those conditions need to be satisfied in an average sense (hence WEAK form). However, do not understimate the power of integral functions just by its name "weak form".
这是一种简单易懂的说法 |
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