作者shake1949 (赖小花)
看板NTU-Exam
标题[试题] 98下 林沛群 工程数学 第三次期中考
时间Wed Jun 30 21:28:32 2010
课程名称︰工程数学 下
课程性质︰系必修
课程教师︰林沛群
开课学院:工学院
开课系所︰机械系
考试日期(年月日)︰2010/6/2
考试时限(分钟):120
是否需发放奖励金:是
(如未明确表示,则不予发放)
试题 :
(本文d均表示偏微分符号)
1.(35%) Solve the following boundary value problem
d^2 y/d t^2 = 4 (d^2 y/d x^2) + 2sin(x) 0 < x < π, t > 0
y(0,t) = y(π,t) = 0 for t ≧ 0
y(x,0) = 0
d y(x,0)/dt = 0 for 0 ≦ x ≦ π
2.(25%) Derive a solution of the following problem by Fourier Transform method
du d^2 u
─ = k ─── -∞ < x < ∞ , t > 0
dt d x^2
u(x,0) = f(x)
3.(40%) Solve the Dirichlet problem for a cube, with the given boundary
conditions
▽^2 u = 0 0 < x < 1 , 0 < y < 2 , 0 < z < π
u(0,y,z) = 0 ,u(1,y,z) = sin(πy)sin(z)
u(x,0,z) = u(x,2,z) = 0
u(x,y,0) = 0, u(x,y,π) = 4
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 124.11.64.144