Differential Lag or Forgetting Function

Description

The Differential Lag component serves as a first order high pass filter and is sometimes known as a 'washout' function, a 'change' function, or a 'forgetting' function. The output can be reset to the user specified value at any instant.

The solution method for this function is based on the value of the time constant T as follows:

If T = 0:

The output is then,

Where,

	Output signal
	Input Signal
	Gain factor (can be a variable)
	Time constant (can be a variable)
	Time step interval

Differential Pole (Z-Domain)

Input Parameters

ConfigurationConfiguration

Name for Identification	Text		Optional text parameter for identification of the component.

Limit Output?	Choice		Select Yes or No

Fortran Comment	Text		An optional Fortran comment. The text entered here is included in the project Fortran file

Resettable?	Choice		Select Never, Anytime or Timezero. Choosing Timezero will allow for the assignation of an initial value.

Reset Value	REAL	Variable	Enter the value to which to reset the output

Main DataMain Data

Gain	REAL	Variable	Gain factor

Time Constant	REAL	Variable	Time constant [s]

LimitsLimits

Maximum	REAL	Variable	Limits the output to this maximum limit

Minimum	REAL	Variable	Limits the output to this minimum limit