An exact solution for vibro-acoustic response of smart sandwich panels with MEE composite Layer

2005 ◽

Author(s):

Francesco Franco ◽

Kenneth A. Cunefare ◽

Massimo Ruzzene

Keyword(s):

Numerical Optimization ◽

Composite Structures ◽

Gradient Methods ◽

Sandwich Panels ◽

Relative Importance ◽

Structural Elements ◽

Acoustic Response ◽

The Core ◽

Design Flexibility ◽

The Face

Sandwich panels, comprising face sheets enclosing a core, are increasingly common structural elements in a variety of applications, including aircraft fuselages and flight surfaces, vehicle panels, lightweight enclosures, and bulkheads. The design flexibility associated with such composite structures provides significant opportunities for tailoring the structure to the load and dynamic response requirements for the particular application. Design flexibility encompasses the details of the face sheets and the core. This paper deals with the numerical optimization of different sandwich configurations for the purposes of achieving reduced structural acoustic response. Laminated face sheets and core geometries, comprising honeycomb and truss-like structures, are considered. The relative importance of the mass and stiffening properties of the core and face sheets are discussed. The optimization work is carried out using commercial codes. Benefits and limits of using an optimization algorithm based on gradient methods are highlighted.

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Low-frequency vibro-acoustic response of an optimized fiber-reinforced graphite truss sandwich panel filled with wood-based material

Journal of Low Frequency Noise Vibration and Active Control ◽

10.1177/14613484211022979 ◽

2021 ◽

pp. 146134842110229

Author(s):

Luyao Wang ◽

Liming Dai ◽

Gang Hu

Keyword(s):

Noise Control ◽

Transmission Loss ◽

Low Frequency ◽

Sandwich Panels ◽

Weight Ratio ◽

Frequency Noise ◽

Fiber Reinforced ◽

Acoustic Response ◽

Acoustic Characteristics ◽

Fiber Materials

Conventional metallic sandwich panels are widely used for noise control owing to their good noise control capabilities and excellent mechanical strength-to-weight ratio property. Furthermore, sound-absorbing products consisting of glass or mineral fiber materials are generally filled into the sandwich structures to lower the vibration response in resonance frequency and to enhance the structural noise attenuation capacity. In the present study, a fiber-reinforced graphite material is used as an alternative to its metallic counterparts. Moreover, a wood-based renewable absorption material is used as the absorption material and is filled into the sandwich structural core. The vibro-acoustic characteristics of the panel with such a design are numerically investigated using Actran. The findings of the research indicate that the proposed sandwich structure achieves advanced low-frequency noise control performance in comparison with other conventional metallic sandwich panels. Approximately 7 dB increase in sound transmission loss in the audible-frequency range is achieved in addition to a reduced panel weight and more stable vibration with reduced amplitude. The existing data available in the literature are employed for validating and illustrating the accuracy and reliability of the proposed approach.

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Exact solution of bending problem for continuous sandwich panels with profiled facings

Journal of Constructional Steel Research ◽

10.1016/j.jcsr.2014.04.033 ◽

2014 ◽

Vol 101 ◽

pp. 53-60 ◽

Cited By ~ 4

Author(s):

Bronisław Gosowski ◽

Maciej Gosowski

Keyword(s):

Exact Solution ◽

Sandwich Panels

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An Exact Solution for the Buckling Load of Flat Sandwich Panels with Loaded Edges Clamped

Journal of the Aeronautical Sciences (Institute of the Aeronautical Sciences) ◽

10.2514/8.2761 ◽

1953 ◽

Vol 20 (9) ◽

pp. 605-612 ◽

Cited By ~ 11

Author(s):

S. V. NARDO

Keyword(s):

Exact Solution ◽

Sandwich Panels ◽

Buckling Load

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Structural-Acoustic Optimization of Sandwich Panels

Journal of Vibration and Acoustics ◽

10.1115/1.2731410 ◽

2006 ◽

Vol 129 (3) ◽

pp. 330-340 ◽

Cited By ~ 36

Author(s):

Francesco Franco ◽

Kenneth A. Cunefare ◽

Massimo Ruzzene

Keyword(s):

Composite Structures ◽

Sandwich Panels ◽

Structural Elements ◽

Acoustic Response ◽

Truss Core ◽

Design Flexibility ◽

Radiated Sound ◽

Optimal Configurations ◽

Selection Of ◽

Radiated Sound Power

Sandwich panels comprising face sheets enclosing a core are increasingly common structural elements in a variety of applications, including aircraft fuselages, flight surfaces, vehicle panels, lightweight enclosures, and bulkheads. This paper presents the optimization of various innovative sandwich configurations for minimization of their structural-acoustic response. Laminated face sheets and core geometries comprising honeycomb and trusslike structures are considered. The design flexibility associated with the class of considered composite structures and with truss-core configurations provides the opportunity of tailoring the structure to the load and dynamic response requirements of a particular application. The results demonstrate how the proper selection of selected key parameters can achieve effective reduction of the radiated sound power and how the identified optimal configurations can achieve noise reduction over different frequency ranges and for various source configurations.

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