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
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TL;DR: In this paper, the variation in dynamic stiffness due to a geometrical shift of a cylindrical vibration isolator is predicted by a scaling law and compared to the results of a waveguide solution.
3 citations
TL;DR: A weak form of the Biot's equation represented in a cylindrical coordinate system using a spatial Fourier expansion in the circumferential direction is presented in this paper, where the original three dim dim lights are used.
Abstract: A weak form of the anisotropic Biot's equation represented in a cylindrical coordinate system using a spatial Fourier expansion in the circumferential direction is presented. The original three dim ...
3 citations
01 May 2020
3 citations
TL;DR: In this paper, the authors investigated the audible frequency range behavior of a truck damper element, connected to surrounding structures by means of rubber bushings, applying a mixed measurement/modeling procedure.
Abstract: The audible frequency range behaviour of a truck damper element, connected to surrounding structures by means of rubber bushings, is investigated, applying a mixed measurement/modelling procedure. The damper element properties are retrieved through an experimental procedure, while the rubber bushings are modelled using a finite element formulation including a realistic fractional derivative visco-elastic rubber model. Focus is on the influence of the subpart properties on the overall dynamic behaviour. It is found that, in the audible frequency range studied, ~100–1000 Hz, an accurate model of the rubber bushings plays an important role, while the level of detail in the description of the dynamical behaviour of the damper element itself is less crucial, contributing mainly with its lumped mass; these results aid in the development of new, quiet vehicles.
2 citations
01 Jan 2018
TL;DR: In this paper, the multiple-order response of a rotor equipped with a centrifugal pendulum vibration absorber (CPVA) is investigated in order to understand if an higher-order amplification can stem from the design of the CPVA or if this phenomenon is due an interaction between other powertrain components.
Abstract: The multiple-order response of a rotor equipped with a centrifugal pendulum vibration absorber (CPVA) is investigated in this study. CPVAs have been used in the abatement of torsional vibrations since the 1930s and have been extensively researched but seldom with a focus on the full multiple-harmonic response. Although the firing order in reciprocating engines dominates in amplitude, the higher-order harmonics have impact on driveline-related noise issues. This investigation is conducted in order to understand if an higher-order amplification can stem from the design of the CPVA or if this phenomenon is due an interaction between other powertrain components. Therefore, an isolated rotor-CPVA system is studied. The investigated rotor is subjected to an oscillating torque consisting of single- and multiple-order harmonics. The equations of motion are derived by Kane s method and the multiple-harmonic response of the system is analyzed. The linear steady-state response is compared with numerical time integration of the equations of motion.
2 citations
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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