Concept

Natural frequency

Related publications (5)

Rotordynamic performance and design implications for aerodynamic bearings under external forcing: numerical modeling and experimental validation

External vibration can drive high-speed rotors on gas bearings into high-excursion orbits, risking damage or functional failure and making forced-response predictions essential. This work examines the periodic base-excited response of a rigid rotor on herringbone-grooved journal bearings. The role of stiffness and damping of compliant bearing supports in containing forced-response orbits is also assessed. We present a non-intrusive algorithm for constructing efficient frequency-domain surrogates of (nonlin

EPFL2026

Seismic Response of Rock Towers at the Trona Pinnacles (U.S.A.) to the 2019 Ridgecrest Earthquake Sequence: Theory, Observations, and Models

We analyze the seismic response of a class of fragile geologic features (FGFs), referred to as rock towers (RTs) at the Trona Pinnacles, a group of RTs in southern California that suffered strong shaking during the 2019 Ridgecrest earthquake sequence. FGFs, including RTs, may provide maximum constraints on past earthquake shaking intensity, and thereby support probabilistic seismic hazard assessments (PSHAs). In a rare case study, we explore the hypothesis that RT structural integrity is time dependent, as

Seismological Society of America (SSA)2025

Thermal responses and flow instability of manifold ring-microchannel heat sink applied for periodic heat flow conditions

This study presents a systematic experimental investigation into the thermal-fluidic characteristics of a novel manifold ring-microchannel heat sink operating under periodic heat flux conditions. The research focuses on analyzing the coupled thermal responses and flow instability phenomena across a wide range of disturbance frequencies (0.5–500 Hz) and mass flux conditions (1.0–3.44 g/s). Through comprehensive measurements of wall temperature distributions, pressure fluctuations, and high-speed visualizatio

AIP Publishing2025

Step Function in Momentum Space by a Metagrating

Metasurface research has shown significant potential for controlling the polarization, amplitude, phase, and propagation direction of light. Nevertheless, control over the angular response of incident light remains a long-standing problem. In this work, the potential of diffractive systems for obtaining a step function in momentum space is shown, where the mirror symmetry of the angular transmittance is broken. By engineering the scattering response of an asymmetric particle in a metagrating, such a step fu

WILEY-V C H VERLAG GMBH2025

Prediction of hydro-acoustic resonances in hydropower plants by a new approach based on the concept of swirl number

François Avellan, Christophe Nicolet, Arthur Tristan Favrel, Christian Landry, Sébastien Alligné, Loïc Andolfatto, Joao Gomes Pereira Junior

Hydropower plant units operating in off-design conditions are subject to cavitation flow instabilities, potentially inducing hydro-acoustic resonances under certain conditions. They can be predicted by using one-dimensional numerical models of hydropower p ...

Taylor & Francis Ltd2019

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Related publications (5)

Rotordynamic performance and design implications for aerodynamic bearings under external forcing: numerical modeling and experimental validation

EPFL2026

Seismic Response of Rock Towers at the Trona Pinnacles (U.S.A.) to the 2019 Ridgecrest Earthquake Sequence: Theory, Observations, and Models

Seismological Society of America (SSA)2025