Air and internal damping of thin cantilever beams

Baker, W. E.; Woolam, William E.; Young, Dana

doi:10.1016/0020-7403(67)90032-x

Cited by 90 publications

(39 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of aerodynamic damping in the case of flexural beam vibrations was considered by Baker et al [12], Adams and Bacon [2] and Crane and Gillespie [13]. Air damping is due to both air viscosity and inertia effects, and increases with the increase in the amplitude of vibrations.…”

Section: Analysis Of the Frequency Responsementioning

confidence: 98%

See 1 more Smart Citation

Temperature effect on the damping properties of unidirectional glass fibre composites

Sefrani

Berthelot

2006

Composites Part B: Engineering

View full text Add to dashboard Cite

Section: Analysis Of the Frequency Responsementioning

confidence: 98%

“…The beam response w 0 (x,t) can be obtained using a modal analysis of Eq. (12). In the case of a load of amplitude p 1 , concentrated at point xZx 1 of the beam (Fig.…”

Section: Damped Vibrationsmentioning

confidence: 99%

Temperature effect on the damping properties of unidirectional glass fibre composites

Sefrani

Berthelot

2006

Composites Part B: Engineering

View full text Add to dashboard Cite

“…al. [10], the auhors have drawn conclusions about air damping contribution from tests at aluminum beam specimens in a cantilever configuration. The trend is (i) that for large bending amplitudes air damping is increasing in proportion to the amplitude and (ii) that for small amplitudes the air damping loss factor appears to approach a limit which is independent of amplitude.…”

Section: Air Dampingmentioning

confidence: 99%

External damping losses in measuring the vibration damping properties in lightly damped specimens using transient time-domain methods

Vanwalleghem¹,

Baere²,

Loccufier³

et al. 2014

Journal of Sound and Vibration

View full text Add to dashboard Cite

The contaminating effect of external damping sources to the overall measured damping of mechanical structures has always been an issue. Although those sources are qualitatively known, they are often not considered if damping properties are experimentally determined, yielding erroneous results. The aim of this paper is to quantify some of these undesired effects on the overall measured damping value. Free vibrations of steel plate specimens are used to list up several causes of external damping sources. As small modifications to the test setup may lead to totally different results, appropriate actions are offered to design a more accurate test setup. Known observations, such as the damping value's dependence on the specimen size and the excitation level are confirmed. Finally, it is shown that the damping capacity of one type of steel alloy can usually not be generalised to other steel alloys.

show abstract

“…Table 3 higher from NExT estimates. This difference was shown to be due to a drag phenomenon similar to that experienced by an oscillating flat-plate normal to a strong wind [16,17]. Reference [7] contains the results of a simplified calculation, which predicts 1.2% added damping due to the aero-drag effects for the first blade flatwise modes.…”

Section: Verification Of Next (Oma) Using Conventional Modal Test Resmentioning

confidence: 99%

The inception of OMA in the development of modal testing technology for wind turbines

Carne

James

2010

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

Wind turbines are immense, flexible structures with aerodynamic forces acting on the rotating blades at harmonics of the turbine rotational frequency, which are comparable to the modal frequencies of the structure. Predicting and experimentally measuring the modal frequencies of wind turbines has been important to their successful design and operation. Performing modal tests on wind turbine structures over 100 meters tall is a substantial challenge, which has inspired innovative developments in modal test technology. For wind turbines, a further complication is that the modal frequencies are dependent on the turbine rotation speed. The history and development of a new technique for acquiring the modal parameters using output-only response data, called the Natural Excitation Technique (NExT), will be reviewed, showing historical tests and techniques. The initial attempts at output-only modal testing began in the late 1980's with the development of NExT in the 1990's. NExT was a predecessor to OMA, developed to overcome these challenges of testing immense structures excited with environmental inputs. We will trace the difficulties and successes of wind turbine modal testing from 1982 to the present.

show abstract

Air and internal damping of thin cantilever beams

Cited by 90 publications

References 1 publication

Temperature effect on the damping properties of unidirectional glass fibre composites

Temperature effect on the damping properties of unidirectional glass fibre composites

External damping losses in measuring the vibration damping properties in lightly damped specimens using transient time-domain methods

The inception of OMA in the development of modal testing technology for wind turbines

Contact Info

Product

Resources

About