Damping Determination by Half-Power Bandwidth Method for a Slightly Damped Rectangular Steel Plate in the Mid-Frequency Range

Treszkai, Marcell Ferenc; Sipos, Dávid; Feszty, Dániel

doi:10.14513/actatechjaur.v13.n3.545

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The three steps differ in the way how the DLF values are determined, while extracting the CLF values from the analytical formulas in the VA One software. Note that in the 2 nd option, the DLF values come from a previous study of the authors [26], where a pure flat plate of the same size as Plate 1 and 2 is measured in uncoupled form. All the simulations assume the same conditions, i.e.…”

Section: Fig 14 Comparison Of the Clfs Of The Two Different Glues 6 Analytical Coupling In Sea Simulationsmentioning

confidence: 99%

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Power Injection Method-based evaluation of the effect of binding technique on the Coupling Loss Factors and Damping Loss Factors in Statistical Energy Anal-ysis simulations

Treszkai¹,

Peiffer²,

Feszty³

2021

Manufacturing Technology

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Measurement results on the Damping Loss Factor (DLF) and Coupling Loss Factor (CLF) between two steel plates is presented for 19 different junction types. The junctions involve joining technologies, such as line welding, point welding, bolting, riveting, gluing or their combinations, and with varying spacing between the junction points and the angle between the plates. From the measurement results, the DLF and CLF values were calculated by the Power Injection Method for the purposes of being applied in Statistical Energy Analysis simulations. Four excitations were applied at each subsystem by impact hammer, while the response was recorded at sixteen response points at each subsystem. The measured CLF values were compared to each other from various aspects. Data were compared to the results obtained from SEA simulations by using the built-in analytical formulas. In general, good comparison was observed, although the results appeared to be somewhat dependent on the frequency band. Finally, it was examined whether replacing the DLF values with data obtained for an uncoupled flat plate, as well replacing the CLF values with data from analytical formulas leads to acceptable accuracy of the simulation results.

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Section: Fig 14 Comparison Of the Clfs Of The Two Different Glues 6 Analytical Coupling In Sea Simulationsmentioning

confidence: 99%

“…18 shows, the analytical point CLFs match the experiment results very well, moreover at lower frequencies the results are better compared to the measured values. Next, the results from Step 2 are introduced, by using results from a previous study by the authors [26]. In that work, the damping of an uncoupled flat plate was examined.…”

Section: Fig 17mentioning

confidence: 99%

Power Injection Method-based evaluation of the effect of binding technique on the Coupling Loss Factors and Damping Loss Factors in Statistical Energy Anal-ysis simulations

Treszkai¹,

Peiffer²,

Feszty³

2021

Manufacturing Technology

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“…One good method to check the adequacy of frequency resolution is plotting the FRF curves in Nyquist diagram [7]. In order to validate the number of discrete points in half power bandwidth, an experimental test was carried out and the FRFs were plotted in Nyquist diagrams: Fig 4 shows the coarser, while Fig.…”

Section: Figure 3 Amplitude Distortion As a Function Of Number Of Discrete Points In The Half Power Bandwidth Of A Resonance At A Constanmentioning

confidence: 99%

Influence of frequency resolution in case of frequency response function measurement in structural dynamics

Gazdagh¹,

Vehovszky

2021

Acta Tech. Jaurinensis

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Frequency resolution is an essential parameter in acoustical testing, even if we are using numerical or experimental method, for example when determining frequency response function (FRF) of a dynamic mechanical system, or executing modal analysis based on the FRFs. Finer resolution leads to more accurate results, at the expense of longer calculation/measurement process and larger data size. This parameter is generally set based on rules of thumb, prior practice or with big margin for safety. This results in waste time and data storage if the required frequency resolution is overestimated, or even significant errors in the results, if it is underestimated. Present paper offers a direct, method for the conscious determination of optimal frequency resolution. It is based fully on theoretical considerations, and investigates amplitude and phase distortion at resonances as target parameters. Beside defining the steps of the process, it is tested on a real structure, and the results are presented as well, proving the applicability and the appropriateness of the method. With this method, development engineers get a practical tool for adjusting the parameters of dynamic measurements and simulations.

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Airborne Noise and Vibration Control Treatments

Fischer,

Boroditsky

2024

Noise and Vibration Control on Ships

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Damping Determination by Half-Power Bandwidth Method for a Slightly Damped Rectangular Steel Plate in the Mid-Frequency Range

Cited by 3 publications

References 9 publications

Power Injection Method-based evaluation of the effect of binding technique on the Coupling Loss Factors and Damping Loss Factors in Statistical Energy Anal-ysis simulations

Power Injection Method-based evaluation of the effect of binding technique on the Coupling Loss Factors and Damping Loss Factors in Statistical Energy Anal-ysis simulations

Influence of frequency resolution in case of frequency response function measurement in structural dynamics

Airborne Noise and Vibration Control Treatments

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