Convert symbolic expressions to Simscape language equations
simscapeEquation(f) converts the symbolic expression
f to a Simscape™ language equation. This function call converts any derivative with
respect to the variable
t to the Simscape notation
X is the
time-dependent variable. In the resulting Simscape equation, the variable
time replaces all instances
of the variable
t except for derivatives with respect to
simscapeEquation converts expressions with the second and
higher-order derivatives to a system of first-order equations, introducing new
variables, such as
x2, and so on.
simscapeEquation(LHS,RHS) returns a Simscape equation
LHS == RHS.
Convert Expressions to Simscape Equations
Convert the following expressions to Simscape language equations.
syms t x(t) y(t) phi = diff(x) + 5*y + sin(t); simscapeEquation(phi) simscapeEquation(diff(y),phi)
ans = 'phi == sin(time)+y*5.0+x.der;' ans = 'y.der == sin(time)+y*5.0+x.der;'
Convert ODE to Simscape Equation
Convert this expression containing the second derivative.
syms x(t) eqn1 = diff(x,2) - diff(x) + sin(t); simscapeEquation(eqn1)
ans = 'x.der == x1; eqn1 == sin(time)-x1+x1.der;'
Convert this expression containing the fourth and second derivatives.
eqn2 = diff(x,4) + diff(x,2) - diff(x) + sin(t); simscapeEquation(eqn2)
ans = 'x.der == x1; x1.der == x2; x2.der == x3; eqn2 == sin(time)-x1+x2+x3.der;'
The equation section of a Simscape component file supports a limited number of functions. For details and the list of supported functions, see Simscape
equations(Simscape). If a symbolic equation contains functions that are not available in the equation section of a Simscape component file,
simscapeEquationcannot convert these equations correctly to Simscape equations. Such expressions do not trigger an error message. Expressions with infinities are prone to invalid conversion.