Component Equations
The purpose of the equation section is to establish the mathematical relationships among a component’s variables, parameters, inputs, outputs, time, and the time derivatives of each of these entities. Topics on this page provide detailed information on defining component equations and the related tasks.
Sintassi del linguaggio
assert | Program customized run-time errors and warnings |
delay | Return past value of operand |
der | Return time derivative of operand |
equations | Define component equations |
function | Reuse expressions in component equations and in member declarations of domains and components |
integ | Perform time integration of expression |
intermediates | Define intermediate terms for use in equations |
tablelookup | Return value based on interpolating set of data points |
time | Access global simulation time |
value | Convert variable or parameter to unitless value with specified unit conversion |
Argomenti
- Defining Component Equations
The purpose of the equation section is to establish the mathematical relationships among a component’s variables, parameters, inputs, outputs, time and the time derivatives of each of these entities.
- Simple Algebraic System
This example shows implementation for a simple algebraic system.
- Use Simulation Time in Equations
This example shows how you can access global simulation time from the equation section.
- Using Conditional Expressions in Equations
You can specify conditional equations by using
if
statements. - Using Intermediate Terms in Equations
Textbooks often define certain equation terms in separate equations, and then substitute these intermediate equations into the main one.
- Using Lookup Tables in Equations
You can use the
tablelookup
function in theequations
section of the Simscape™ file to interpolate input values based on a set of data points in a one-dimensional, two-dimensional, or three-dimensional table. - Programming Run-Time Errors and Warnings
Use the
assert
construct to implement run-time error and warning messages for a custom block. - Initial Equations
Specify additional equations to be executed during model initialization only.
- Simscape Functions
Use Simscape functions to reuse expressions in equations and member declarations of multiple components.
- Import Symbolic Math Toolbox Equations
Example of using Symbolic Math Toolbox™ software to solve the physical equations, generate code in the format appropriate for the Simscape language equation section, and incorporate the generated code into the equation section of a component file.