Investigating the effect of mass redistribution on damping of building models using a shake table and a laser Doppler vibrometer

Nimun Nak Khun; Tiana Robinson; Tzuyang Yu

doi:10.1117/12.2612706

18 April 2022 Investigating the effect of mass redistribution on damping of building models using a shake table and a laser Doppler vibrometer

Nimun Nak Khun, Tiana Robinson, Tzuyang Yu

Author Affiliations +

Proceedings Volume 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI; 120470O (2022) https://doi.org/10.1117/12.2612706
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Abstract

Remote sensing is one of the promising technologies in nondestructive evaluation (NDE) and structural health monitoring (SHM) for civil infrastructures, in view of its convenience and flexibility in field data collection. Among existing remote sensing techniques, laser doppler vibrometer (LDV) is an ideal tool for periodic inspection of building-type and bridge-type structures. In this paper, application of LDV on extracting modal frequencies and damping of a building model on a shake table is investigated to study the effects of mass distribution on characteristic damping of the building model. A commercially available LDV (Short Wave InfraRed (SWIR) laser, range = 1.7m 300m, OptoMET) was used on a building model excited by ground motion generated by a shake table in the frequency range of 1Hz and 10Hz. Sinusoidal ground motion was adapted to produce non-trivial initial conditions (displacement and velocity) in the vibration of the building model. Free vibration response of the building model with different configurations (e.g., location of introduced mass) was measured by the LDV. A metal block was used as introduced mass and a target reflector for the LDV. Effects of excitation frequency on the measurement accuracy of modal frequencies and characteristic damping were also studied. From our experimental result, it is found that the measurement accuracy of LDV is not vulnerable to the change in excitation frequency. In-plane displacement appears to be more reliable than out-of-plane displacement for extracting modal frequencies and characteristic damping of the building model.

Citation Download Citation

Nimun Nak Khun, Tiana Robinson, and Tzuyang Yu "Investigating the effect of mass redistribution on damping of building models using a shake table and a laser Doppler vibrometer", Proc. SPIE 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI, 120470O (18 April 2022); https://doi.org/10.1117/12.2612706

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
13 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Laser Doppler velocimetry

Motion models

Structural health monitoring

Doppler effect

Data modeling

Signal to noise ratio

Inspection

Keywords/Phrases

Search In:

Publication Years