关键词:
Numerical integration
polynomial approximation
ODE
variable coefficients
initial conditions
boundary conditions
stiff equation
摘要:
Many problems in engineering sciences can be described by linear,inhomogeneous,m-th order ordinary differential equations(ODEs)with variable *** this wide class of problems,we here present a new,simple,flexible,and robust solution method,based on piecewise exact integration of local approximation polynomials as well as on averaging local *** method is designed for modern mathematical software providing efficient environments for numerical matrix-vector operation-based *** on cubic approximation polynomials,the presented method can be expected to perform(i)similar to the Runge-Kutta method,when applied to stiff initial value problems,and(ii)significantly better than the finite difference method,when applied to boundary value ***,we use the presented method for the analysis of engineering problems including the oscillation of a modulated torsional spring pendulum,steady-state heat transfer through a cooling web,and the structural analysis of a slender tower based on second-order beam *** convergence studies provide insight into the satisfying characteristics of the proposed solution scheme.