Vibration transmission and power flow of laminated composite plates with inerter-based suppression configurations

Vibration and sound radiation analysis of temperature-dependent porous functionally graded material plates with general boundary conditions

Mechanical behavior of liquid nitrile rubber-modified epoxy resin: Experiments, constitutive model and application

Free vibration of symmetric and antisymmetric cross-ply composite laminated truncated conical shells using the spline function technique is studied. The equilibrium equations for a truncated conical shells are formulated including first-order shear deformation theory. The equations of motion are derived in terms of displacement functions and rotational functions using stress–strain and strain–displacement relationships. The coupled differential equations are solved using Bickley-type splines to obtain the generalized eigenvalue problem by combining suitable boundary conditions. The convergence and comparative results are presented. Both symmetric and anti-symmetric cross-ply shells are considered using various types of material properties. Parametric studies are made to investigate the effect of transverse shear deformation on the frequency parameter with respect to the thickness ratio, length ratio, cone angle, and circumferential mode number using different numbers of layers under various types of boundary conditions.

Vibration analysis of cross-ply laminated truncated conical shells using a spline method

The spline function technique is used to analyze the vibration of multi-layered circular cylindrical shells with cross-ply walls including first-order shear deformation theory. Both antisymmetric and symmetric cross-ply laminations are considered in this analysis. The governing equilibrium equations are obtained in terms of displacement and rotational functions. A system of coupled ordinary differential equations in terms of displacement and rotational functions are obtained by assuming the solution in a separable form. These functions are approximated by using Bickley-type splines of suitable order to obtain the generalized eigenvalue problem by applying point collocation techniques with appropriate boundary conditions. Parametric studies are performed to analyze the frequency response of the shell with reference to the material properties, number of layers, fiber orientation, thickness to radius ratio, length to radius ratio and circumferential node number. Reasonable agreement is found with existing results obtained by FEM and other methods. Valuable results are presented as graphs and discussed.

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Free vibration of multi-layered circular cylindrical shell with cross-ply walls, including shear deformation by using spline function method

Free vibration of laminated cross-ply plates including shear deformation by spline method

Effect of fiber orientation on acoustic and vibration response of a carbon fiber/epoxy composite plate: Natural vibration mode and sound radiation

Recently, the vibration characteristics and acoustic prediction of composite plates with various boundary conditions has been studied due to their favorable relation of weight to strength. This paper studies the vibration response and acoustic prediction of thin rectangular carbon fiber-reinforced plastic (CFRP) plates. The plate has clamped boundary condition for the four edges. The unidirectional rectangular carbon fiber-reinforced plastic (CFRP) plate is excited by a harmonic concentrated force. The excited point location is approximately the fourth point of the plate length due to avoid nodal point. Comparison of the natural frequency and mode shape between theoretical value and experimental data is conducted. Theory used in this paper is the classical plate theory (CPT) that is applicable to the thin plate (the CPT neglects the effect of the transverse shear deformation). Sound pressure is measured at 1m central point to compare the acoustic radiation characteristics. Rayleigh integral equation was used to predict the acoustic radiation characteristic. Finally, to verify the theoretical solution and value of experimental data, numerical solution is also obtained by FE tool. It is found that the peak levels of sound pressure occur only in non-symmetric vibration mode. Some peak also occurs in experiment at symmetric mode, because it does not implement the full symmetric mode practically.

Analysis and experiment of vibration and acoustic characteristics of carbon fiber- reinforced plastic plate with fixed boundary conditions

Vibration and acoustic properties of composite materials have been a significant issue to apply to a vehicle due to fuel efficiency and other advantages. To improve NVH of the vehicle consisted of composite material, it is important to exactly analyze characteristics of composite material. The work described in this paper is a study of the dynamic and acoustic response characteristics of a vibrating carbon fiber reinforced plastic (CFRP) rectangular plate. The plates are three depending on the unidirectional fiber orientation angle (0°, 45°, 90°) and excited by a harmonic point force with fixed boundary conditions. First, the natures of vibrating plate, which are eigenfrequencies and mode shapes, are obtained by FEM. Second, numerical simulations for the acoustic results are carried out by weekly coupled FEM/BEM with commercial finite software. Finally, experimental works are also conducted with proto type composite plate to verify numerical results. It is found that the natural frequencies and mode shapes are similar one another and changed according to the fiber orientation angles at lower frequency region. The vibration and sound pressure level are also similar but little different because of the experimental error.

Sang Kwon Lee

Papers

Free vibration of laminated cross-ply plates including shear deformation by spline method

Effect of fiber orientation on acoustic and vibration response of a carbon fiber/epoxy composite plate: Natural vibration mode and sound radiation

Analysis and experiment of vibration and acoustic characteristics of carbon fiber- reinforced plastic plate with fixed boundary conditions

Numerical analysis of vibration and acoustic characteristics for a cfrp composite plate