Author
Ning-Kang Hu
Bio: Ning-Kang Hu is an academic researcher. The author has contributed to research in topics: Vibration & Constrained-layer damping. The author has an hindex of 1, co-authored 1 publications receiving 44 citations.
Papers
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TL;DR: In this paper, the authors analyzed the design parameters for constrained layer damping structures by employing the Ross-Kerwin-Ungar (RKU) model and discussed the effects of temperature, frequency and the dimensions of damped structures on vibration damping characteristics.
47 citations
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TL;DR: In this article, a transfer function method was developed to obtain closed-form and uniform solution for the vibration analysis of EulereBernoulli beams with different boundary conditions, and analytical expressions for critical viscoelastic parameters, damping parameters and limiting frequencies were obtained.
Abstract: The dynamic characteristics of damped viscoelastic nonlocal beams are studied in this paper. The KelvineVoigt and three-parameter standard viscoelastic models, velocity-dependent external damping and nonlocal EulereBernoulli beam theory are employed to establish the governing equations of motion for the bending vibration of nanobeams. A transfer function method (TFM) is developed to obtain closed-form and uniform solution for the vibration analysis of EulereBernoulli beams with different boundary conditions. New analytical expressions for critical viscoelastic parameters, damping parameters and limiting frequencies are obtained. Considering a carbon nanotube as a numerical example, the effects of the nonlocal and viscoelastic constants on the natural frequencies and damping factors are discussed. The results demonstrate the efficiency of the proposed modeling and analysis methods for free vibration analysis of viscoelastic damped nonlocal EulereBernoulli beams.
92 citations
TL;DR: In this article, the authors investigated the bending response of a simply supported functionally graded (FG) viscoelastic sandwich beam with elastic core resting on Pasternak's elastic foundations.
Abstract: The investigation of bending response of a simply supported functionally graded (FG) viscoelastic sandwich beam with elastic core resting on Pasternak’s elastic foundations is presented. The faces of the sandwich beam are made of FG viscoelastic material while the core is still elastic. Material properties are graded from the elastic interfaces through the viscoelastic faces of the beam. The elastic parameters of the faces are considered to be varying according to a power-law distribution in terms of the volume fraction of the constituent. The interaction between the beam and the foundations is included in the formulation. Numerical results for deflections and stresses obtained using the refined sinusoidal shear deformation beam theory are compared with those obtained using the simple sinusoidal shear deformation beam theory, higher- and first-order shear deformation beam theories. The effects due to material distribution, span-to-thickness ratio, foundation stiffness and time parameter on the deflection and stresses are investigated.
74 citations
TL;DR: In this article, the constrained layer damping (CLD) configuration, also known as viscoelastically damped sandwich structure, is considered, and the material-parameter extraction procedure is presented, and mathematical models are reviewed.
42 citations
TL;DR: In this article, a constrained layer damping toolholder was developed to increase the axial depth of cut and stable spindle speed for end milling operation, which is influenced by dynamic stiffness and natural frequency of the milling tool holder.
41 citations
TL;DR: In this paper, a parametric study is performed to explore the effect that the design parameters, namely the thickness/length ratio, constraining layer thickness, material modulus, natural mode and boundary conditions have on these two counterparts and subsequently, on the treatment efficiency.
29 citations