Effect of boundary conditions in the experimental determination of structural damping

Geweth, C. A.; Baydoun, Suhaib Koji; Saati, Ferina; Sepahvand, K.; Marburg, Steffen

doi:10.1016/j.ymssp.2020.107052

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…A structural modal damping ratio of 1% is chosen according to the recommendation of the European timber standard [36]. The damping identified for the test specimens S1* and S2* is deemed inappropriate for the FE-model of floor structures, i.e., S1 and S2, since boundary conditions significantly influence the damping of a structure [37] as well as the overall built-up. Furthermore, no structural vibration tests have been possible on large-scale floor structures in a built-in situation.…”

Section: Model For Vibroacoustic Validationmentioning

confidence: 99%

Vibration and impact sound properties of hybrid steel-timber floor structures

Chocholaty,

Roozen,

Hoppe

et al. 2024

Acta Acust.

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Lightweight floor structures, such as timber or hybrid timber floors, face challenges associated with excessive vibrations and elevated levels of low-frequency impact sound. Especially here, accurate prediction of a floor’s vibration and acoustic behavior is essential. However, typical laboratory testing of building elements is costly and time-consuming. To reduce costs, in this study, adapted simulations are carried out on two types of hybrid steel-timber floor structures to evaluate vibrations and impact sound. The hybrid elements are made of laminated veneer lumber as the top and bottom layers and a trapezoidal steel component as the web. Vibration measurements are used in combination with Bayesian optimization to efficiently calibrate Finite Element models, which are subsequently utilized to quantify and validate the floor structures regarding vibrations and impact sound. The two types of cross-sections, i.e., closed and open, are investigated and compared. The impact sound pressure level computations reveal promising results in predicting the behavior of the hybrid structures. However, further countermeasures are required to fulfill vibration serviceability requirements.

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Section: Model For Vibroacoustic Validationmentioning

confidence: 99%

Vibration and impact sound properties of hybrid steel-timber floor structures

Chocholaty,

Roozen,

Hoppe

et al. 2024

Acta Acust.

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show abstract

“…In the experimental set-up, specimens were stimulated by induced airflow and response was picked up with a laser Doppler vibrometer. In a study conducted by Geweth et al, 22 damping responses of aluminium plates under various boundary conditions, and hence effects of the boundary conditions on the damping performance were investigated. It was concluded that the lowest damping was observed when the specimens were suspended at nodal lines.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and dynamic responses of unidirectional/woven carbon fiber reinforced thermoset and thermoplastic composites after low velocity impact

Kayaaslan

Coskun

Şahi̇n

et al. 2022

Polymers and Polymer Composites

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It is highly important to determine how mechanical and dynamic properties of composite materials will change after impact loads considering the coupled effects of composite design parameters. For these reasons, three-point bending and vibration tests have been carried out for the carbon fiber reinforced thermoset and thermoplastic composites with various stacking sequences before and after low velocity impact, and it is expected that these results achieved from the current study will be beneficial for applications where high damping and impact resistance are demanded together. In this context, vibration tests were carried out under free-free boundary conditions, and their natural frequencies, flexural moduli and structural damping were obtained. Furthermore, three-point tests were conducted in the elastic region with 1 mm/min crosshead speed using a universal test machine, and thus flexural moduli of the composite specimens were obtained. The results were validated by comparing the flexural moduli obtained from the both vibration and three-point bending tests, found to be reliable and comparable. As a result of the current study, it was concluded that woven fabric reinforced composite specimens exhibited 50% higher specific damping capacity (SDC) but 70% lower flexural modulus than unidirectional specimens thanks to biaxially fiber alignment. On the other hand, specific damping capacities of the thermoset and thermoplastic composites with different stacking sequences have been examined, and it was observed that thermoset specimens exhibited unexpectedly 192% higher SDC compared to the thermoplastics. This was interpreted as even though thermoplastics are normally expected to exhibit more damping than thermosets, stacking sequence being more effective on damping responses. Apart from that, although there were slight changes in material properties due to degradation in structural integrity after 2 m/s and 3 m/s low-velocity impacts, it was not found to be significantly effective due to the limited damage areas.

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Experimental and numerical investigation on glass panel subjected to pendulum impact

Huang

et al. 2023

International Journal of Impact Engineering

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Effect of boundary conditions in the experimental determination of structural damping

Cited by 9 publications

References 25 publications

Vibration and impact sound properties of hybrid steel-timber floor structures

Vibration and impact sound properties of hybrid steel-timber floor structures

Mechanical and dynamic responses of unidirectional/woven carbon fiber reinforced thermoset and thermoplastic composites after low velocity impact

Experimental and numerical investigation on glass panel subjected to pendulum impact

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