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Filter, 2nd-order

The Filter, 2nd-order component is a second-order low-pass filter that implements the following transfer function:

Symbol

Mask Parameters

NameDescriptionUnitVariable = {Possible Values}
DescriptionUse this field to add all kinds of information about the component
Description = {'string'}
Filter natural frequency
Second-order natural low-pass filter frequencyHzFreqFilter_fn = { [0, 1e12] }
Filter damping ratioSecond-order low-pass filter damping rate. The damping ratio is typically a value between 0 and 1
FreqFilter_zeta = { [0, 1] }
Initial input (DC component)Initial value of the DC component magnitude of the output signal for the first simulation cycle. This value cannot be modified during the simulation
InitialOutput = { [0, 1e12] }

Input/Output Signals

Name

Description

Type

u

Input signal

Input

y

Filtered output signal

Output

Sensor Descriptions

Name

Description

Unit

u

Input signal

No unit

y

Filtered output signal

No unit

Internal Circuit of Component

Limitations

The Filter, 2nd-order component is designed for DC input signals. With AC input signals, the component output presents a temporary offset corrected after several time steps.

Example Model

This example demonstrates the usage of First order and Second order filter blocks. A 60Hz sinusoidal signal is given as an input to the second order low pass filter block with 60Hz natural frequency and a damping of 0.707.

Simulation results

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