Derivative

Output is the time derivative of input.

Collaboration diagram for Derivative:

Output is the time derivative of input. If this object is not combined with a system that needs constant evaluation it will give inaccurate results because it only updates input at the times specified for output.

Author

Karl-Johan Reite

Benjamin Scholz

Date

14.08.2007 KJR: Initial version.

20.07.2011 KGA: Ported to FhSim 2.0.

25.07.2011 KGA: Added documentation.

Example configuration excerpt

<Lib
  LibName   = "fhsim_base"
  SimObject = "Math/Derivative"
  Name      = "A"
  PortWidth = "2"
/>
...
<Connection
  A.In = "1,2"
/>

Input Ports

Name	Width	Description
In	<PortWidth>	The input port

Output Ports

Name	Width	Description
Out	<PortWidth>	The derivative of the input signal

Configuration parameters

Name	Width	Description
PortWidth		The number of elements in the input and output ports

Initial conditions

This SimObject contains no initial conditions.

Full example file

<Contents>
  <OBJECTS>
    <Lib
        LibName="base" 
        SimObject="Math/Derivative"  
        Name="A" 
    />
  
 
  <Lib
        LibName="base"
        SimObject="Src/Clock"
        Name="M"
    
    />
  </OBJECTS>
  
  <INTERCONNECTIONS>
    <Connection
    A.In="M.SimTime"
    />
  </INTERCONNECTIONS>
 
  <INITIALIZATION>
    <InitialCondition
 
    />
  </INITIALIZATION>
 
  <SIMULATION>
    <Timing TStart="1" TEnd="30"/>
    <Integrator Method="RK45_i" NumCores="1" LogStates="1" UseRSSNorm="0">
      <StepControl StepMax="0.002" StepMin="0.00000001" AbsTol="1e-3" RelTol="1e-3"/>
    </Integrator>
    
  </SIMULATION>
 
<OBSERVERS>
    <FileOutput TOutput="1, 1,2,3,4,5, 30" Select="object.A:ports"/>
  </OBSERVERS>
</Contents>

This SimObject is referred to as Math/Derivative