Backlash

This block represents a backlash system in which the input and output are directly related when the system is engaged. If the direction of the input changes, the system enters a neutral zone where the output remains constant.

    Backlash

Library

Activate/Hybrid

Description

The Backlash block represents a backlash system where the input and the output are directly related when the system is engaged. In case the direction of the input changes, the system enters a neutral zone (deadzone) where the output is then constant. The term deadzone refers to a neutral zone with the width of parameter Gap and centered at the block current output. The system starts in disengaged mode when simulation starts.

Once the input with a positive slope reaches the upper end of the deadzone, the system is engaged and the output is y(i) = u(i) - Gap/2

When the input with a negative slope reaches the lower end of the deadzone, the system is engaged and the output is y(i) = u(i) + Gap/2

The system is disengaged when the input changes direction, the output remains its previous value y(i) = y(i-1)

Parameters

Backlash_0

NameLabelDescriptionData TypeValid Values

ini

Initial output

Initial output value is the center of the deadzone when simulation starts.
Real value. Default 0. Scalar or matrix (dimension compatible with block input signal).

Matrix

gap

Gap

Width of the deadzone, or gap. Real value. Default 1. Scalar (applies to all the output) or matrix (of compatible dimension), each element defines the gap for each signal.

Matrix

zcr

Apply zero-crossing

Activate the zero-crossings detection.

Scalar

0
1

externalActivation

External activation

Specifies whether the block receives an external activation or inherits its activation through its regular input ports. When External Activation is selected, an additional activation port is added to the block. By default, external activation is not selected.

Number

0
1

Ports

NameTypeDescriptionIO TypeNumber

Port 1

explicit

output

1

Port 2

explicit

The input data type should be double.

input

1

Port 3

activation

input

externalActivation

Advanced Properties

NameValueDescription

always active

no

direct-feedthrough

yes

zero-crossing

yes

mode

no

continuous-time state

no

discrete-time state

no

See Also