fem lesson 1
DESCRIPTION
basic of fem with fdmTRANSCRIPT
Finite element methods
Chapter 1 The basis
1.1 Numerical differentiation• For a given discrete function
• Taylor expansion gives the following • Taking interval
With h = x i+1-xi
1.1 Numerical differentiation• Taking upto only second derivative term
• using above we can get
1.1 Numerical differentiation• Hence the differentiation rule called
central derivative (first)
Similarly, second derivative
1.1 Numerical differentiationFunction is u(x) vertical and the points are x on the horizontal
1.2 Ordinary differential equations• Initial value problem
Given a first order differential equation
Whose initial value is given i.e we know at a point x0 what is the value of the function y(x0) and we call the value y0
1.2 Ordinary differential equations• An example, given
,h = delta x = 0.1 , y(0) = - 0.2
The solution diagram
1.3 ODE beam of first , second, third and fourth order
1.4 Partial differential equation and plates