BACKLASH

Block Screenshot

Contents

• Description
• Parameters
• Default properties
• Interfacing function
• Computational function
• Example

Description

The block Backlash allows the representation of a system presenting a mechanical play like system of gearings. When the input increases (decreases), changes of the input of the block Backlash give equal changes of its output. When the input changes direction, the system is disengaged during a short moment (the play is called deadband or gap). Therefor, at the initial moment of the change, the input has no effect and the output remains constant. Then, changes of the input give equal changes on the output up to the next change of direction of the input.

Parameters

• Initial output

  The initial output value.

  Properties : Type 'vec' of size 1

• Gap

  The width of the dead-band.

  Properties : Type 'vec' of size 1

• Use zero-crossing

  Select to enable use of zero crossing detection to detect engagement with lower and upper thresholds.

  Properties : Type 'vec' of size 1

Default properties

• always active: no

• direct-feedthrough: yes

• zero-crossing: yes

• mode: no

• regular inputs:

  - port 1 : size [1,1] / type 1

• regular outputs:

  - port 1 : size [1,1] / type 1

• number/sizes of activation inputs: 0

• number/sizes of activation outputs: 0

• continuous-time state: no

• discrete-time state: no

• object discrete-time state: no

• name of computational function: backlash

Interfacing function

• SCI/modules/scicos_blocks/macros/Misc/BACKLASH.sci

Computational function

• SCI/modules/scicos_blocks/src/c/backlash.c (Type 4)

Example