Damping class

The Damping class gives you access to damping cards in PRIMER. More...

The PRIMER JavaScript API provides many class constants, properties and methods. For Arup to be able to extend and enhance the API in the future any constant, property or method names beginning with a lowercase or uppercase letter are reserved.
If you need to add your own properties or methods to one of the existing classes then to avoid any potential future conflict you should ensure that the name begins with either an underscore (_) or a dollar sign ($) or the name is prefixed with your own unique identifier.
For example if company 'ABC' need to add a property called 'example' then to avoid any potential future conflict use one of:

Damping properties

Name Type Description
global Object *DAMPING_GLOBAL card
modal Object *DAMPING_MODAL card
structural Object *DAMPING_STRUCTURAL card

Properties for DAMPING_GLOBAL

Name Type Description
exists logical true if damping card exists
include integer The Include file number that the damping card is in.
lcid integer Curve ID specifying system damping constant
srx real Scale factor on global x rotational damping moments
sry real Scale factor on global y rotational damping moments
srz real Scale factor on global z rotational damping moments
stx real Scale factor on global x translational damping forces
sty real Scale factor on global y translational damping forces
stz real Scale factor on global z translational damping forces
valdmp real System damping constant

Properties for DAMPING_MODAL

Name Type Description
calcdt real Calculation interval
exists logical true if damping card exists
f_name real Filename
include integer The Include file number that the damping card is in.
prflg integer Printout flag

Properties for DAMPING_STRUCTURAL

Name Type Description
exists logical true if damping card exists
g real Constant structural damping coefficient
include integer The Include file number that the damping card is in.
lcid integer Curve ID Curve ID to define frequency dependent structural damping coefficients
lctyp integer Type of load curve defining structural damping coefficients

Detailed Description

The Damping class allows you to create, modify, edit and manipulate damping cards. Unlike other classes there is no constructor and there are no functions. Instead a Damping object is available as the damping property of a Model object. This object allows you to access the damping cards.
For example,
To activate damping card *DAMPING_GLOBAL in model m and set valdmp to 0.001. 

m.damping.global.exists = true;
m.damping.global.valdmp = 0.001;

To activate damping card *DAMPING_MODAL in model m and set prflg to 1. 

m.damping.modal.exists = true;
m.damping.modal.prflg = 1;

To activate damping card *DAMPING_STRUCTURAL in model m and set g to 0.02. 

m.damping.structural.exists = true;
m.damping.structural.g = 0.02;

See the properties for more details.