Document: NUREG-0800
Document ID: b0ebadda-78e1-434f-8ae0-b28c50bca486
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A223.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
equation of motion. For the composite modal damping approach, two techniques of determining an equivalent modal damping matrix or composite damping matrix are commonly used. They are based on the use of the mass or stiffness as a weighting function in generating the composite modal damping. The formulations lead to: { } [ ]{ } ϕ ϕ β M T j = (1) { } [ ]{ } * K K T j ϕ ϕ β = (2) where