Acoustic Performance Evaluation of a Panel Utilizing Negative Stiffness Mounting for Low Frequency Noise Control

Paradeisiotis, Andreas; Kalderon, Moris; Antoniadis, Ioannis; Fouriki, Lina

doi:10.47964/1120.9335.19276

Cited by 8 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4, represents the FFR panel approximation as given by Eq. (18). Intuitively, this approximation should constitute the ideal case regarding the STL of a panel with finite dimensions and may act as a reference curve for the various comparisons instead of the infinite panel approximation which is invalid in the lower frequency range that is being examined.…”

Section: Numerical Example -Parametric Investigation Of Stlmentioning

confidence: 99%

“…The idea of utilizing "soft mounts" to reduce the fundamental frequency of the system delves into the investigation of what constitutes soft mounting. Therefore, a modeling procedure based on certain approximations [18] is formulated in order to provide a projection of the expected level of stiffness that satisfies this terminology and serves the intended purpose. Intuitively, following the general concepts of vibration isolation for the reduction of the eigenfrequency through the reduction of stiffness, supporting an existing panel on elastic mounts, the 'mass law' behavior may be dragged into lower frequencies and the resonant region of the new system panel-mount will be moved below a critical frequency, for example at 20 Hz considering the threshold of human hearing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simulating Low Frequency Sound Transmission Loss of Mounted Panels

Kalderon¹,

Paradeisiotis²,

Antoniadis³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

Lightweight panels are very common in the building, aerospace and automotive industry, and their acoustic insulation properties are well studied; nevertheless, low frequency noise is inherently difficult to deal with, mainly due to its high penetration. To encounter this issue, several treatments have been proposed in the form of perforated plates, meta-surfaces and acoustic/elastic meta-materials among others. Despite, the continuous attempts, none of the available solutions has indicated an outstanding performance in the low frequency range. On the other hand, boundary conditions of a vibrating panel are known to have an influence on the sound transmission loss (STL). Driven by the recently extended standards to include frequencies as low as 50 Hz, and the academic community debate about the reliability of lowfrequency measurements in reverberant chambers, STL improvement in the region of the first panel resonance is investigated in this paper, considering a panel supported on elastic mounts. Following a general vibration isolation approach, the fundamental eigenfrequency of the panelmount system is reduced and is explicitly selected below the threshold of human hearing. STL predictions are accomplished utilizing a Finite Element (FE) vibroacoustic model that simulates real test room conditions. Compared to the commonly used models of a baffled plate radiating to infinity, this detailed approach allows not only a more accurate calculation of STL but also reveals the potential issues emerging during laboratory measurements. COMPDYN 2021 8 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

show abstract

Section: Numerical Example -Parametric Investigation Of Stlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulating Low Frequency Sound Transmission Loss of Mounted Panels

Kalderon¹,

Paradeisiotis²,

Antoniadis³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

show abstract

“…The KDamper combines the favourable properties of both the NS and traditional TMD, providing exceptional damping characteristics to the structure. By incorporating the additional NS element, the damper's inertial forces are increased, and the need for large mass is significantly reduced [10,11]. The stiffness-mass elements can be allocated appropriately to create a system that is statically and dynamically stable, maintaining the structure's initial/static stiffness and avoiding potential instabilities.…”

Section: Introductionmentioning

confidence: 99%

3d Numerical Investigation of an Extended Kdamper Absorber for Seismic Retrofitting of Low-Rise Buildings

Mantakas,

Kapasakalis,

Kalderon

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

Research in the field of seismic protection has progressed significantly, starting from the use of simple elastomeric bearings that require a reduction of the system's fundamental frequency to control the dynamic response of the superstructure, to more advanced vibration control devices that incorporate the use of additional oscillating masses and negative stiffness elements. Examples of these devices are the Tuned Mass Damper (TMD), the Quasi-Zero oscillators (QZSs) as well as the KDamper concept that is based essentially on a combination of appropriate stiffness, damping and mass elements, including a negative stiffness element. In this study, a passive KDamper-based vibration absorber is implemented at the base level of a typical existing building, between the foundation and the superstructure, as a means of seismic retrofitting. A mathematical model is formulated, and an optimization procedure is undertaken using both EC8 compatible artificial accelerograms as well as real earthquake records. Geometrical and manufacturing limitations are accounted for, regarding the realization of the negative stiffness mechanics and the rest vibration control components. A sophisticated 3D finite element model is subsequently generated aiming to take into account soilstructure interaction, material non-linearities and effect of geometry and location of the device in a realistic manner. Results indicate the beneficial effect of the system in the dynamic behavior of the structure and highlight the applicability of the system as well as limitations that should be considered in future research.

show abstract

“…Recently, attempts have been made towards artificially increasing the resonating mass's inertia via negative stiffness elements or amplification mechanisms. For example, the inclusion of negative stiffness elements to the oscillating system shows promising results in addressing this issue, to a certain extent, revealing the potential of the KDamper (KD) concept [19,28,29] towards the design of low-frequency acoustic metamaterials [30][31][32]. Similarly, inspired by the successful application of inertial amplifiers in engineering applications, several works proved their suitability in the context of periodic structures [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%