Author
Leif Kari
Bio: Leif Kari is an academic researcher from Royal Institute of Technology. The author has contributed to research in topics: Natural rubber & Audio frequency. The author has an hindex of 21, co-authored 105 publications receiving 1371 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the complete blocked dynamic stiffness matrix of along rubber bush mounting of particular interest for noise abatement is examined by an analytical model, where influences of audible frequencies, material properties, bush mounting length, and radius, are investigated.
Abstract: The complete blocked dynamic stiffness matrix of along rubber bush mounting of particular interest for noise abatement is examined by an analytical model, where influences of audible frequencies, material properties, bush mounting length, and radius, are investigated The model is based on the dispersion relation for an infinite, thick-walled cylinder with arbitrary boundary conditions at the radial inner and outer surfaces; yielding the sought stiffness matrix, including axial, torsional, radial, and tilting stiffness A nearly incompressible material model is adopted, being elastic in dilatation while displaying viscoelasticity in deviation The applied deviatoric Mittag-Leffler relaxation function is based on a fractional standard linear solid, the main advantage being the minimum number of parameters required to successfully model the rubber properties over a broad structure-borne sound frequency domain The dynamic stiffness components display a strong frequency dependence at audible frequencies, resulting in acoustical resonance phenomena, such as stiffness peaks and troughs The low-frequency stiffness asymptotes of the presented model are shown to agree with those of static theories
10 citations
TL;DR: In this paper, an audio-frequency wave-guide model for antisymmetric dynamic stiffness of arbitrary long elastomer cylinders is presented, which is based on a fractional derivative of a standard linear solid embodying a Mittag-Leffler relaxation kernel.
10 citations
01 Jan 1998
TL;DR: In this article, four papers concerning the audibledynamic stiffness of a vibration isolator are presented, including measurements and theoretical modeling, and the study focus isrubber isolators, being the mo...
Abstract: This thesis consists of four papers concerning the audibledynamic stiffness of a vibration isolator; includingmeasurements and theoretical modeling. The study focus isrubber isolators, being the mo ...
10 citations
01 Jan 2003
TL;DR: In this article, the preload-dependent dynamic stiffness of a primary suspension isolator on a high-speed tilting bogie was examined via measurements and modelling within an audible frequency range.
Abstract: The preload-dependent dynamic stiffness of a primary suspension isolator on a high-speed tilting bogie is examined via measurements and modelling within an audible frequency range. The stiffness is found to depend strongly on both frequency and preload. The former displays some resonance phenomena, such as stiffness peaks and troughs, while the latter exhibits a steep low-frequency stiffness increase in addition to an anti-resonance peak shifting to a higher frequency with increased preload. The problems of simultaneously modelling the preload and frequency dependence are removed by adopting a frequency-dependent waveguide approach, assuming incompressible rubber with an Abel operator kernel as its shear relaxation function. The preload dependence is modelled by a non-linear shape factor based approach, using a globally equivalent preload configuration. All the translational stiffnesses are modelled, including the vertical, longitudinal and lateral directions, and the vertical stiffness results ar...
9 citations
TL;DR: An axial, dynamic stiffness model of an arbitrary wide and long rubber bush mounting was developed within the audible frequency range, where influences of audible frequencies, material properties, and material properties were taken into account as mentioned in this paper.
9 citations
Cited by
More filters
TL;DR: In this paper, the authors focus on the important role and challenges of high-k polymer-matrix composites (PMC) in new technologies and discuss potential applications of highk PMC.
1,412 citations
TL;DR: In this paper, a comprehensive assessment of recent developments of nonlinear isolators in the absence of active control means is presented, which highlights resolved and unresolved problems and recommendations for future research directions.
885 citations
TL;DR: In this article, the authors present the analysis of new trends and recent results carried out during the last 10 years in the field of fractional calculus application to dynamic problems of solid mechanics.
Abstract: The present state-of-the-art article is devoted to the analysis of new trends and recent results carried out during the last 10 years in the field of fractional calculus application to dynamic problems of solid mechanics. This review involves the papers dealing with study of dynamic behavior of linear and nonlinear 1DOF systems, systems with two and more DOFs, as well as linear and nonlinear systems with an infinite number of degrees of freedom: vibrations of rods, beams, plates, shells, suspension combined systems, and multilayered systems. Impact response of viscoelastic rods and plates is considered as well. The results obtained in the field are critically estimated in the light of the present view of the place and role of the fractional calculus in engineering problems and practice. This articles reviews 337 papers and involves 27 figures. DOI: 10.1115/1.4000563
491 citations
TL;DR: In this paper, the structural damping characteristics of polymeric composites containing single-walled carbon nanotubes (SWNTs) were investigated, with a focus on analyzing the interfacial interaction between the CNT and the resin materials.
348 citations
01 Jan 2016
TL;DR: Formulas for natural frequency and mode shape is available in the authors' book collection an online access to it is set as public so you can get it instantly.
Abstract: formulas for natural frequency and mode shape is available in our book collection an online access to it is set as public so you can get it instantly. Our book servers hosts in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the formulas for natural frequency and mode shape is universally compatible with any devices to read.
333 citations