SIMPLORER User Manual V6.0 - FER-a

Equations
SIMPLORER 6.0 — Manual 303
In empty fields the * must be placed; 0 is interpreted as a numerical value.
For the common equation:
M_2 ϕ ·· M_1 ϕ · ⋅ + ⋅ + M_0 ⋅ ϕ = RS
the results with the inserted coefficients of the example are:
d
J1 *
* J2 2 ϕ1 dt 2
---------d
2 dϕ1 Ki1 – Ki
--------
1 dt C1 – C1 ϕ1 ⋅ +
⋅ + ⋅ =
RS
– Ki
ϕ 1 Ki1dϕ2– C1 C1 ϕ2 2
--------
-----------
dt
dt
Dialog Settings
«Ord»«Dim»
Defines order and dimension of the equation system. Enter a numerical value (non-negative
integer with or without unit suffix) in the text box to define the order and positive integer to
define the dimension. Please note: You cannot define a variable or expression in these cases.
Only a number is accepted.
«Matrix»
Defines the vector coefficients. Select a matrix entry and click in the fields of the corresponding
coefficient in the matrix dialog on the right hand side. Common parameter type. Enter a
numerical value, a variable, or an expression.
RS «Vector»
Defines the coefficients of the vector on the right hand side. Select «RS» and click in the fields
of the corresponding coefficient in the matrix dialog on the right hand side. Common parameter
type. Enter a numerical value, a variable, or an expression.
IC «Vector»
Defines the coefficients of the initial values of the solution vector. Select «IC» and click in the
fields of the corresponding coefficient in the matrix dialog on the right hand side. Common
parameter type. Enter a numerical value, a variable, or an expression.
� «Integrator»
Defines the integration algorithm of the DES model. The algorithm is independent of the integration
algorithm of the main simulator. If «ODE» is checked, you can select also the
Runge-Kutta algorithms in the list. These algorithms expect a non-singular matrix for the matrix
M with the highest order. If the matrix does not meet the condition, the simulator uses
the «Euler» integration method for calculating.
«Fmax»
Defines the accuracy of the right side computation of the differential equation system. Enter
a numerical value (with or without unit suffix) in the text box. Please note: The simulator tries
to meet the defined maximum error as long as the minimum time step of the higher simulator
is not reached. If HMIN is reached and Fmax is larger than the defined value, the simu.lator
goes to the next step despite the deviation.