Vibro-acoustic analysis of composite circular disc with various orthotropic properties
TL;DR: In this article, composite circular discs with polar orthotropic and rectangular orthotropic fibers of different composite materials are modeled and their vibration response due to harmonic point load was computed by finite element method (FEM) using ANSYS.
Abstract: Composite circular discs with polar orthotropic and rectangular orthotropic fibers of different composite materials are modeled and their vibration response due to harmonic point load was computed by finite element method (FEM) using ANSYS. Acoustic response of composite circular disc was computed by coupling the vibration data from FEM to the boundary element method using LMS SYSNOISE.
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TL;DR: In this article, the experimental nonlinear viscoelastic behavior, tensil tensil properties, and properties of the composite material were investigated in various industrial applications, including structural applications.
Abstract: In the structural applications, the composite material employs a significant contribution in various industrial applications. In this paper, the experimental nonlinear viscoelastic behavior, tensil...
20 citations
TL;DR: In this paper, adding different reinforcements to the polymer composite is gaining more importance in the manufacturing industries because of their variation in mechanical properties, to satisfy modern industrial requirements, such as high temperature and high humidity.
Abstract: Adding different reinforcements to the polymer composite is gaining more importance in the manufacturing industries because of their variation in mechanical properties. To satisfy modern industrial...
19 citations
TL;DR: In this paper, the effect of aluminum and copper wire mesh embedded as structural reinforcement on jute epoxy hybrid composite was investigated, and the hybrid composites were prepared by using a combination of aluminum wire mesh and composite materials.
Abstract: This work was investigated that the effect of aluminium (Al) and copper (Cu) wire mesh embedded as a structural reinforcement on jute epoxy hybrid composite The hybrid composites were prepared by
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TL;DR: In this paper, a set of elementary asymptotic equations for modal radiation self-impedance and mutual impedance is presented, which are necessary for numerical computations of radiated active and reactive acoustic power including the acoustic attenuation.
Abstract: The Neumann boundary value problem of the Helmholtz equation of a vibrating circular membrane embedded into a flat rigid baffle is solved. The membrane is excited asymmetrically and radiates acoustic waves into the half-space above the baffle. A set of elementary asymptotic equations for modal radiation self-impedance and mutual impedance is presented. The equations are necessary for numerical computations of the radiated active and reactive acoustic power including the acoustic attenuation. A few equations available in the literature are collected. All the missing equations have been obtained using the methods of analysis of contour integral and stationary phase. The presented equations cover a wide frequency band, with the exception of the lowest frequencies and the frequencies close to coincidence.
9 citations
Cites background from "Vibro-acoustic analysis of composit..."
...−∞ M (c) m,n(k)M (c)∗ m′,n′(k) M (c) m,n(k)M (s)∗ m′,n′(k) M (s) m,n(k)M (c)∗ m′,n′(k) M (s) m,n(k)M (s)∗ m′,n′(k) dξdη γ (18)...
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...(18)–(23) has made it possible to express acoustic power from Eq....
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TL;DR: In this article, composite circular discs with polar orthotropic and rectangular orthotropic fibres of different composite materials are modelled and their vibration response due to harmonic point load under thermal environment was computed by Finite Element Method (FEM) using ANSYS.
Abstract: Composite circular discs with polar orthotropic and rectangular orthotropic fibres of different composite materials are modelled and their vibration response due to harmonic point load under thermal environment was computed by Finite Element Method (FEM) using ANSYS. Acoustic response of composite circular disc was computed by coupling the vibration data from FEM to the Boundary Element Method (BEM) using LMS SYSNOISE.
4 citations
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TL;DR: The commonly applied rule of using six (linear) elements per wavelength in linear time-harmonic acoustics is discussed in this article, and a survey of related work is collected.
Abstract: The commonly applied rule of thumb to use six (linear) elements per wavelength in linear time-harmonic acoustics is discussed in this paper. In a survey of related work, rules of element design in computational acoustics are collected. This is followed by a brief review of the boundary element method and a more detailed presentation of boundary element interpolation functions. Constant, bilinear and biquadratic interpolation polynomials are used on triangular and quadrilateral elements. In the investigation of a long duct, the numeric solution of the three dimensional problem is compared with the analytic solution. The performance of triangular and quadrilateral, constant, bilinear and biquadratic elements is compared. The error of the numeric solution is calculated in the maximum norm and the Euclidean norm on the surface and at internal points. It is estimated how many elements per wavelength are required to remain below certain error bounds of the sound pressure magnitude. Finally, a sedan cabin compar...
256 citations
IBM1
166 citations
TL;DR: In this article, sound radiation characteristics of an annular disk with application to the computer disk are examined analytically, and a simple empirical equation has been developed to predict the modal sound radiation efficiency of a rotating disk for selected vibration modes.
Abstract: Sound radiation characteristics of an annular disk with application to the computer disk are examined analytically. The far‐field and the radiation impedance approaches are employed to calculate radiated sound of a disk vibrating at its elastic or rigid body modes. Modal sound power is formulated by approximating the structural modal functions and is expressed in terms of a power series of the wave number. Predictions show that axisymmetric vibration modes are more efficient radiators compared to those asymmetric disk modes that have the same number of nodal circles. Numerical results obtained by a boundary element program are used to support analytical predictions. Formulations are also extended to include the modal coupling and source rotation effects. The effect of coupling between disk vibration modes on the radiated sound is found to be significant if multimodes are excited. A simple empirical equation has been developed to predict the modal sound radiation efficiency of a rotating disk for selected vibration modes.
76 citations
TL;DR: In this article, structural eigensolutions for the out-of-plane modes and sound radiation from the modal vibration of a thick annular disk with free-free boundaries have been calculated using both thick and thin plate theories.
63 citations
TL;DR: In this article, the results of three different methods to determine the in-plane elastic properties of sheet materials were compared and the differences between the results obtained with the three experimental approaches were critically evaluated.
Abstract: This paper compares results of three different methods to determine the in-plane elastic properties of sheet materials. Results obtained with standard resonant beam and tensile tests are used to assess a mixed numerical–experimental technique developed to determine the in-plane elastic properties of orthotropic plates from the resonance frequencies of rectangular plate samples (the so-called ‘Resonalyser’ technique). Test materials were selected on the basis of an expected low degree of elastic anisotropy in order to put the accuracy and sensitivity of the different techniques to assess anisotropic materials to a test. Therefore, aluminium alloy and stainless steel samples were prepared from hot-rolled plates, deliberately avoiding pronounced cold-rolling textures. The differences between the results obtained with the three experimental approaches are critically evaluated. In the case of very thin plates, the existing mixed numerical–experimental Resonalyser procedure succeeded in accurately identifying the elastic material properties. A slightly adapted procedure is proposed to extend the applicability of the Resonalyser procedure to thicker plates.
50 citations