Ramp

Ramp signal.

Collaboration diagram for Ramp:

This is a ramp signal. The user specifies start parameters (time/value) and stop parameters (time/value). A line segment between these two points results in a linearly increasing or decreasing function, between the initial and final point in time.

An illustrative example of a ramp function.

Author

Karl-Johan Reite

Vegar Johansen

Date

16.04.2007 KJR: Initial version.

09.07.2007 VJ: Added functionality for vectors and ensured that output ports are set initially

17.02.2011 KJR: Rewritten and ported.

19.07.2011 KGA: Added documentation

Example configuration excerpt

<Lib
  LibName    = "fhsim_base"
  SimObject  = "Src/Ramp"
  Name       = "ramp"
  PortWidth  = "1"
  StartValue = "0"
  StartTime  = "1"
  StopValue  = "1"
  StopTime   = "2"
/>

Input Ports

This function has no inputs.

Output Ports

Name	Width	Description
Out	<PortWidth>	The ramp output signal
OutDot	<PortWidth>	The derivative of the ramp output signal

Configuration parameters

Name	Width	Description
PortWidth	1	The number of elements in the signal.
StartValue	<PortWidth>	The start value of the output port. This may either be a scalar, or a comma separated list referring to the different elements of the signal.
StopValue	<PortWidth>	The stop value of the output port. This may either be a scalar, or a comma separated list referring to the different elements of the signal.
StartTime	<PortWidth>	The time to start the step. This may either be a scalar, or a comma separated list referring to the different elements of the signal.
StopTime	<PortWidth>	The time to stop the step. This may either be a scalar, or a comma separated list referring to the different elements of the signal. If this is negative, this is a true step function with unlimited duration. If it is larger than zero, it is a pulse function, which goes back to the StartValue after the StopTime.

Initial conditions

There are no initial conditions for this function.

Full example file

<Contents>
  <OBJECTS>
    <Lib
        LibName="base"
        SimObject="Src/Ramp"
        Name="A"
        StopValue="10"
        StartTime="0"
        StopTime ="10"
    />
   
  </OBJECTS>
  
  <INTERCONNECTIONS>
    <Connection
    />
  </INTERCONNECTIONS>
 
  <INITIALIZATION>
    <InitialCondition
    />
  </INITIALIZATION>
 
  <INTEGRATION>
    <Engine
    IntegratorMethod="2"
    NumCores="1"
    TOutput="0, 0:0.1:10, 100"
    LogStates ="1"  
    stepsize ="0"
    HMax="0.002"
    HMin="0.00000001"
    AbsTol="1e-3" RelTol="1e-3"
    UseRSSNormInsteadOfInfNorm="0"
    FileOutput="objects:all"
    />
  </INTEGRATION>
</Contents>

This SimObject is referred to as Src/Ramp