Consistent-mode indicator for the eigensystem realization algorithm

Pappa, Richard S.; Elliott, Kenny B.; Schenk, Axel

doi:10.2514/3.21092

Cited by 170 publications

(64 citation statements)

References 5 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Converge plots (26) are commonly used to demonstrate the effect of changing N. As N increase up to a point all the 'known' modes appear more convincingly, and beyond that point artificial modes appear. At the same N of poles is incremented to 100, hence for a=b=N=100, H is 400x400 and up to 100 pole-pairs are obtained, identifying 50 possible modes.…”

Section: Performance Of Next/eramentioning

confidence: 99%

Ambient vibration studies for system identification of tall buildings

Brownjohn

2002

Earthq Engng Struct Dyn

207

105

View full text Add to dashboard Cite

The performance of a building under wind and seismic loads depends on stiffness and mass distribution, and may be estimated using finite element codes. Experience has, however, shown that such finite element models often fail to predict the fundamental natural frequencies. Most of the time the frequencies will be underestimated, that is the building will turn out to be stiffer than anticipated, meaning the design would usually be conservative. On the other hand effects like torsional eccentricity and foundation compliance may not be correctly modelled, which could be less desirable.A full understanding of linear performance under lateral loads can be obtained through experimental evaluation of the vibration modes though use of sensitive transducers (accelerometers) and appropriate data acquisition and modal analysis software. Traditionally a limited range of modal analysis procedures and software have been borrowed and applied to civil applications, but recent developments in system identification permitting modal analysis without measured input forces have been applied to a number of full-scale structures. The basis of some of these procedures are explained and the performance presented through case studies on two tall buildings in Singapore are reported here.Experience shows that a quick and reliable estimation of mode shapes and frequencies can be obtained. Judgement of modal participation and damping ratios requires more detailed study yet the results are at least as convincing as existing frequency domain methods such as peak-picking.2

show abstract

Section: Performance Of Next/eramentioning

confidence: 99%

Ambient vibration studies for system identification of tall buildings

Brownjohn

2002

Earthq Engng Struct Dyn

207

105

View full text Add to dashboard Cite

show abstract

“…Thus, it is necessary to apply some discrimination procedures to select the modes that are physically meaningful. There are three indicators developed specifically for use with ERA: Extended Modal Amplitude Coherence (EMAC), Modal Phase Colinearity (MPC) and Consistent Mode Indicator (CMI), which is the product of EMAC and MPC [Pappa, Elliott, and Schenk (1993)]. EMAC is a measure of how accurately a particular mode projects forward (in A comparison of the frequencies and damping of the first six modes from the roving hammer impact test and the single excitation point test for span one are shown in Table 1.…”

Section: B Results Of the Single Excitation Point Impact Testmentioning

confidence: 99%

Structural Health Monitoring Studies of the Alamosa Canyon and I-40 Bridges

Farrar¹,

Cornwell²,

Doebling³

et al. 2000

View full text Add to dashboard Cite

“…The Eigensystem Realization Algorithm with Data Correlations (ERA-DC) as implemented in the SOCIT package was used to generate the estimates 9,10 . The superset of potential modes was filtered using the Consistent Mode Indicator (CMI) using a cut-off of 60 for the data reported below 11 . These results are presented as the first assessment overview to initiate detailed assessments of specific dynamics phenomena.…”

Section: Potential Modal Contentmentioning

confidence: 99%

Analysis of Accelerometer Data from a Woven Inflatable Creep Burst Test

James

Grygier²,

Selig³

2015

2nd AIAA Spacecraft Structures Conference

View full text Add to dashboard Cite

Accelerometers were used to montor an inflatable test article during a creep test to failure. The test article experienced impulse events that were classified based on the response of the sensors and their time-dependent manifestation. These impulse events required specialized techniques to process the structural dynamics data. However, certain phenomena were defined as worthy of additional study. An assessment of one phenomena (a frequency near 1000Hz) showed a time dependent frequency and an amplitude that increased significantly near the end of the test. Hence, these observations are expected to drive future understanding of and utility in inflatable space structures. = impulse response function Akji = amplitude for the reference i, response j, increment k ωk = kth increment frequency ξk = kth increment damping ratio tQ = maximum time point used in IRF fit Nomenclature

show abstract

Consistent-mode indicator for the eigensystem realization algorithm

Cited by 170 publications

References 5 publications

Ambient vibration studies for system identification of tall buildings

Ambient vibration studies for system identification of tall buildings

Structural Health Monitoring Studies of the Alamosa Canyon and I-40 Bridges

Analysis of Accelerometer Data from a Woven Inflatable Creep Burst Test

Contact Info

Product

Resources

About