Published online by Cambridge University Press: 08 February 2010
Aims of the project
You are given a mathematical description of a winter sports area and invited to help design a run for the new winter sport of ‘snowboating’ – sliding down mountainsides in a rubber boat, more or less out of control. You will have to obtain reasonable model parameters to define safe operating conditions.
Mathematical ideas used
You are given a fairly realistic dynamical model based on Newton's laws. The equations of motion are coupled differential equations.
MATLAB techniques used
You can solve the differential equations using the numerical methods and MATLAB programmes of (Chapter 7). For convenience, there follows a list of relevant M-files, both standard ones and special ones provided for this particular project. You will have to modify some of these in the course of your study. In each case typing help gives information on the purpose and usage.
topog – 3D and contour plots of slopes
snows 1 – definition of the topographical surface
snowboat – solves the equations of motion for the snowboat
snbtfn – derivative function for the above
fsnow0 – surface function f (scalar args.)
fsnowl – fx and fy
fsnow2 – fxx, fxy and fyy
snowmn – minimisation function for the surface
snowmx – maximisation function for the surface
Preliminary look at the problem
Use the command topog to show a mesh plot followed by a contour plot of the snow hills where the action will take place. It is defined by
where f is some smooth function which can be examined in either snows1.m or fsnow0.m.
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