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*Damper Data

Purpose

To define damping coefficients for use with damper elements.

Theory

Refer to Damper Elements for further information on this feature.

Time-Dependent DAmper ELEMENTS

Keyword Format

A block of lines that define a time-coefficient relationship repeated as often as necessary. The block begins with a line defining the relationship name. It is followed by as many lines as necessary to define each pair of time-coefficient values.

Line defining the relationship name:

NAME=Name [, VARIABLE=TIME]

Line defining time-coefficient values:

Time, Coefficient

 

Each time-coefficient relationship must have at least two points defined.

Table Input

Velocity-Dependent DAmper ELEMENTS

Keyword Format

A block of lines that define a velocity-coefficient relationship repeated as often as necessary. The block begins with a line defining the relationship name. It is followed by as many lines as necessary to define each pair of velocity-coefficient values.  

Line defining the relationship name:

NAME=Name, VARIABLE=VELOCITY

Line defining velocity-coefficient values:

Velocity, Coefficient

 

Each velocity-coefficient relationship must have at least two points defined.

Table Input

Notes

(a)Use as many lines as you need to completely define a particular relationship. You can leave the Name column blank for second and subsequent lines. For subsequent relationships, put the name in the Name column and specify the coefficient data in the same way.

(b)The points defining the relationship can be specified in any order. Flexcom subsequently sorts the data pairs into ascending order of time or velocity.

(c)If the instantaneous solution variable (be it time or velocity) lies between the specified data points, Flexcom uses linear interpolation to determine the relevant damping coefficient.

(d)If the instantaneous solution variable (be it time or velocity) lies outside the specified data range, then Flexcom simply extrapolates from the first or last section of data as appropriate.