damperroutinesmodule Module Reference

Module with subroutines for damper calculations. More...

Functions/Subroutines
subroutine	updatedampers (dampers, timeStep, restart, ierr, updateLV, updateVar)
	Updates all axial- and joint dampers in the model. More...
subroutine, private	calcdamperforces (damper, eV)
	Calculates system force vector contributions from a damper element. More...
subroutine	addindamperforces (FD, RF, damper, sam, ierr)
	Assembles system force vector contributions from a damper element. More...
subroutine	addindampermat (includeStressStiff, scaleC, scaleK, Nmat, damper, sam, ierr, Rhs)
	Assembles system damping matrix contributions from a damper element. More...

Detailed Description

Module with subroutines for damper calculations.

This module contains a set of subroutines for performing various computation tasks on the dampertypemodule::dampertype objects in the model (axial- and joint dampers) during the dynamic or quasi-static simulation.

Function/Subroutine Documentation

addindamperforces()

subroutine damperroutinesmodule::addindamperforces	(	real(dp), dimension(:), intent(inout)	FD,
		real(dp), dimension(:), intent(inout)	RF,
		type(dampertype), intent(in)	damper,
		type(samtype), intent(in)	sam,
		integer, intent(inout)	ierr
	)

Assembles system force vector contributions from a damper element.

Parameters

	FD	System damping force vector
	RF	System reaction forces associated with constrained DOFs
[in]	damper	The damper element to calculate damping forces for
[in]	sam	Data for managing system matrix assembly
[out]	ierr	Error flag

Author

Karl Erik Thoresen

Date

Feb 1999

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addindampermat()

subroutine damperroutinesmodule::addindampermat	(	logical, intent(in)	includeStressStiff,
		real(dp), intent(in)	scaleC,
		real(dp), intent(in)	scaleK,
		type(sysmatrixtype), intent(inout)	Nmat,
		type(dampertype), intent(in)	damper,
		type(samtype), intent(in)	sam,
		integer, intent(out)	ierr,
		real(dp), dimension(:), intent(inout), optional	Rhs
	)

Assembles system damping matrix contributions from a damper element.

Parameters

[in]	includeStressStiff	If .true., include geometric stiffness
[in]	scaleC	Damping matrix scaling factor
[in]	scaleK	Stiffness matrix scaling factor
	Nmat	System newton matrix
[in]	damper	The damper element to calculate damping matrix for
[in]	sam	Data for managing system matrix assembly
[out]	ierr	Error flag
	Rhs	System right-hand-side vector associated with the Newton matrix

This subroutine calculates the damping matrix for a damper element and adds it into the system Newton matrix, multiplied by a factor, scaleC.

Author

Karl Erik Thoresen

Date

Feb 1999

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calcdamperforces()

subroutine, private damperroutinesmodule::calcdamperforces ( type(dampertype), intent(in)  damper, real(dp), dimension(:), intent(out)  eV  )

private

Calculates system force vector contributions from a damper element.

Parameters

[in]	damper	The damper element to calculate damping forces for
[out]	eV	Element damping force vector

Author

Knut Morten Okstad

Date

18 Feb 2008

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updatedampers()

subroutine damperroutinesmodule::updatedampers	(	type(dampertype), dimension(:), intent(inout)	dampers,
		real(dp), intent(in)	timeStep,
		logical, intent(in)	restart,
		integer, intent(inout)	ierr,
		logical, intent(in), optional	updateLV,
		logical, intent(in), optional	updateVar
	)

Updates all axial- and joint dampers in the model.

Parameters

	dampers	All damper elements in the model
[in]	timeStep	Current time increment size
[in]	restart	If .true., we are initializing after restart
	ierr	Error flag
[in]	updateLV	If .true., update axial damper lengths and velocities
[in]	updateVar	If .true., update all other damper variables

The updated length and velocity (and direction) for axial dampers are calculated first. Then all the remaining damper variables are updated. This is to ensure that sensors measuring damper length/velocity are up to date before they are used by engines. Note that for joint dampers, the damper length (and velocity unless deformational damper) coincide with the corresponding joint variables of the owner joint, and need therefore not to be updated here.

Author

Knut Morten Okstad

Date

11 Jun 2002

Author

Bjorn Haugen

Date

14 Jan 2004

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