Low frequency sound insulation using stiffness control with honeycomb panels

Ng, C.F.; Chen, Hui

doi:10.1016/j.apacoust.2006.12.001

Cited by 75 publications

(36 citation statements)

References 8 publications

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“…The transmission loss values of the thin luffa bio-composite samples with h = 1 cm were quite high, being 25 to 30 dB for f = 2 to 6 kHz. It should be underlined that the transmission loss level of a cement panel of 1 cm is 25 to 30 dB at 2 kHz (Ng and Hui 2008). The considerably high values of both elasticity moduli and damping levels as well as high values of transmission loss levels for luffa bio-composite structures make them very attractive for a variety of applications, including sound isolation and vibration attenuation in practical applications.…”

Section: Transmission Loss Levels Of Luffa Bio-compositesmentioning

confidence: 99%

Identification of the Dynamic Characteristics of Luffa Fiber Reinforced Bio-Composite Plates

Genc¹,

Körük²

2017

BioResources

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Luffa cylindrica plant fiber is a new biodegradable engineering material. However, the dynamic behaviors of these new green materials or their composites should be explored to consider them for practical applications. The dynamic characteristics including modal behavior and the elastic and sound isolation properties of luffa-based bio-composite plates were explored in this study. Structural frequency response function measurements were conducted using a few luffa bio-composite plates to identify their modal behavior. The modal frequencies and loss factors of the luffa bio-composite plates were identified by analyzing the frequency response function measurements using a few modal analysis methods such as half-power, circle-fit, and line-fit. The same luffa bio-composite structures were modelled using a finite element formulation with damping capability, and the elastic moduli of the composite plates were identified. In addition, the transmission loss levels of the same luffa composite samples were measured using the impedance tube method. The results showed that luffa composite structures have considerably high stiffness (elasticity modulus: 2.5 GPa), damping levels (loss factor: 2.6%), and transmission loss level (25 to 30 dB for a 1 cm thickness), and their mechanical properties are promising as an alternative disposable material for noise and vibration control engineering applications.

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Section: Transmission Loss Levels Of Luffa Bio-compositesmentioning

confidence: 99%

Identification of the Dynamic Characteristics of Luffa Fiber Reinforced Bio-Composite Plates

Genc¹,

Körük²

2017

BioResources

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“…In comparison to a cement panel of the same mass, the honeycomb panels have higher TL at low frequencies between 100 and 200 Hz due to higher stiffness and damping. The honeycomb panels have more significant vibration responses above 500 Hz but these are limited by damping (Ng and Hui 2008). Thin continuous rolls were produced in conical twin-screw extruders that were then thermoformed into half hexagonal or sinusoidal profiles.…”

Section: Honeycomb Structurementioning

confidence: 99%

Recent Advances in the Sound Insulation Properties of Bio-based Materials

Zhu¹,

Kim²,

Wang³

et al. 2013

BioResources

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Many bio-based materials, which have lower environmental impact than traditional synthetic materials, show good sound absorbing and sound insulation performances. This review highlights progress in sound transmission properties of bio-based materials and provides a comprehensive account of various multiporous bio-based materials and multilayered structures used in sound absorption and insulation products. Furthermore, principal models of sound transmission are discussed in order to aid in an understanding of sound transmission properties of bio-based materials. In addition, the review presents discussions on the composite structure optimization and future research in using co-extruded wood plastic composite for sound insulation control. This review contributes to the body of knowledge on the sound transmission properties of bio-based materials, provides a better understanding of the models of some multiporous bio-based materials and multilayered structures, and contributes to the wider adoption of bio-based materials as sound absorbers.

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“…Ng and Hui (2008) proposed a new honeycomb core design by increasing the stiffness and damping to improve TL in the low-frequency range. Finite element method and shape optimization method were combined to optimize the solid-void layout of a sandwich panel for higher TL (Onen and Caliskan 2010;Chang et al 2005;Ruiz et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

Yoon

Lee

2016

Struct Multidisc Optim

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In this study, we optimally design the core of a metal sandwich panel used in high-speed railway vehicles to minimize the amount of metal solid in the core and subsequently reduce its weight. The optimum core must satisfy constraints regarding sound transmission class (STC) and compliance. Because the solid-void layout in the core strongly affects the acoustic and static characteristics of sandwich panels, the core layout should be carefully designed when reducing the amount of metal solid. To this end, three topology-optimization problems and one size-optimization problem are formulated and sequentially solved. A single unit cell is periodically repeated in the core. Thus, structural and acoustic topology-optimization problems are first formulated and solved for the unit cell. Based on the optimal topologies obtained for the unit cell, a moderate initial solid-void layout in the unit cell is determined for the size-optimization problem to optimally design core. The effectiveness of the current design approach for the core of the sandwich panel is validated by comparing the STC and compliance values of the optimal core design and a reference design. Nomenclature A N n¼1 finite element assembly operator Bmatrix relating the element strain vector to its nodal displacement vector C m e a nc o m p l i a n c e C ini initial mean compliance c speed of sound in air D constitutive matrix d 1 thickness of thin flat plates at both ends in a sandwich panel d 2 thickness of the bar inside a sandwich panel dis (r,m) distance between the centers of the r th and m th elements E r (χ r ) Young's modulus of the r th element

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Low frequency sound insulation using stiffness control with honeycomb panels

Cited by 75 publications

References 8 publications

Identification of the Dynamic Characteristics of Luffa Fiber Reinforced Bio-Composite Plates

Identification of the Dynamic Characteristics of Luffa Fiber Reinforced Bio-Composite Plates

Recent Advances in the Sound Insulation Properties of Bio-based Materials

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

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