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单词 Riccati differential equation
释义

Riccati differential equation

中文百科

Riccati方程 Riccati equation

(重定向自Riccati differential equation)

Riccati方程是形式如y' = q_0(x) + q_1(x) y + q_2(x) y^2 的常微分方程。

先以v = y q_2代入:

v' = v^2 + P(x) v + Q(x)

其中 P = q_1 + \frac{q_2'}{q_2} ;\quad  Q = q_0q_2

再以 v = -\frac{u'}{u} 代入:

u'' - Pu' + Qu = 0

因为

v'=-\left(\frac{u'}{u}\right)'=-\frac{u''}{u} +\left(\frac{u'}{u}\right)^2=-\frac{u''}{u}+v^2\!

\frac{u''}{u}= v^2 -v'=-Q -Pv=-Q +\frac{u'}{u}P\!

因此

u'' -Pu' +Qu=0.\!

最终 y=-\frac{u'}{q_2u}.

英语百科

Riccati equation Riccati方程

(重定向自Riccati differential equation)

In mathematics, a Riccati equation in the narrowest sense is any first-order ordinary differential equation that is quadratic in the unknown function. In other words, it is an equation of the form

where q_0(x) \neq 0 and q_2(x) \neq 0. If q_0(x) = 0 the equation reduces to a Bernoulli equation, while if q_2(x) = 0 the equation becomes a first order linear ordinary differential equation.

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更新时间:2025/6/22 10:17:28