Showing papers by "Leif Kari published in 2018"
TL;DR: In this article, the damping potential of multiple friction contacts in a bladed disk is investigated and friction contacts at tip shrouds and strip dampers are considered, and it is shown that friction damping effect is independent of the number of friction contacts.
14 citations
TL;DR: In this paper, a distributed support element for rail-pad supports is proposed, which is characterized by a Timoshenko beam element formulation over an elastic foundation, giving rise to the distributed Support Element.
Abstract: The finite length nature of rail-pad supports is characterised by a Timoshenko beam element formulation over an elastic foundation, giving rise to the distributed support element. The new element i...
12 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