Abstracts Overview

Long, slender piles may experience stability problems during driving owing to the dynamic load. A simple model with one degree of freedom shows the main parameters involved: the ratio of the driving frequency and the eigenfrequency, the relative damping and the strength of the impact. An analytic fo...

We are interested in a first-principle time-delayed model for the study of active mode-locking. It allows us to access the typical regimes encountered in semiconductor lasers and to perform an extended bifurcation analysis. In particular, close to the harmonic resonances and to the lasing threshold,...

This work investigates the dynamic responses of a fluid-structure interaction (FSI) system executing vortex-induced vibrations (VIVs) when subjected to soft impacts with a deformable barrier. Discontinuity-induced bifurcations (DIBs) like grazing, followed period-added cascades interspersed with cha...

Rolling without slipping is often assumed during modeling unicycles resulting in kinematic constraints and simplified description of the system. However, in real cases, slipping may occur especially in case of low friction coefficients. In this study, the wheel-ground contact of the unicycle is mode...

Local resonators (LRs) are commonly used in metamaterials to realize low-frequency bandgaps. Such strategies can be implemented in chiral auxetic lattices as well. The presence of thick bandgaps in the sub-Bragg frequency ranges can be demonstrated for different chiral configurations and are highly ...

This paper addresses pole placement of a nonlinear system and experiment carried out using hammer test to demonstrate how the poles can be moved in the Laplace domain. Receptance method is developed for nonlinear systems that is extended formulation of the linear receptance method. The mathematical ...

Most dynamic analyses of wind turbine towers are conducted in a simplified manner, only considering harmonic load and no nonlinear modal coupling. However, a more realistic model should take into account the coupled behavior, where the wind turbine rotor and tower are simultaneously influenced by ea...

Metamaterials are recognized as artificially microstructured media, exhibit distinct effective material properties, and can be tailored to achieve negative properties that inhibit the propagation of acoustic or elastic waves. Traditional linear metamaterials (LMs), relying on resonance mechanisms, a...

The striatum brain nucleus is central for motor and cognitive functions. We propose a large-scale biophysical network for this part of the brain, using a modified Hodgkin-Huxley dynamics for neurons and a connectivity which is informed by a detailed human atlas. In this complex slow-fast system diff...

The relationship between stationary solitons and energy localization in chains of nonlinear oscillators has been extensively documented in the literature. Despite the established nature of this correlation, studies providing a deep analysis of damped solitons solely subjected to external excitation ...

In this paper, a recently proposed continuous dynamic second-order friction model is implemented in the commercial multibody system package Simpack and compared with impack's discontinuous friction model for stick-slip applications. The comparison, performed on a model of a festoon cable system, foc...

O-type ball valves are widely used in various fields. The nonlinear vibration of O-type ball valves would cause damage on valve components and accessories, and flow-induced vibration is the major component of the whole vibration. During the use of valves, cavitation often occurs, accompanied by more...

We discuss synchronization in networks of dynamical systems which interact via nonlinear coupling functions. First, we characterize nonlinear (potential) instabilities that drive systems apart in absence of coupling. Next, we constructively design nonlinear coupling functions that target these (pote...

Liquid density measurement using buried channel microresonators reduces the sample amount compared to those using macro-scale ones. In this study, we consider a buried channel microcantilever made of stainless-steel for density measurement use. We propose the utilization of electrostatic force to ex...

Nanomechanical resonators often exhibit nonlinear dynamic behaviors due to their small sizes. In this study, we show that the geometric nonlinearity of high-Q Si3N4 nanomechanical string resonators can be substantially tuned by support design. Through careful engineering of support geometries, we co...

Compared to traditional robotic systems, small-scale robots, ranging from several millimetres to micrometres in size, are capable of reaching narrower and vulnerable regions with minimal damage. However, conventional small-scale robots’ limited maneuverability and controlability hinder their abili...

The distinction between dynamical systems with random parameters and noise is investigated. The transfer operator theory is presented for both cases, showing their differences, and discussing ways to numerically approximate them. It is shown that random parameter systems can be approximated through ...

Sigmoid functions contain a transition region between two constant values. As smoothed switches between quantities, these functions can be found in many fields of physics and engineering. The main motivation of the present work is the combined frictional effect between rigid bodies with the presence...

The dynamical behavior of cylindrical offshore structures, which are excited by nonlinear water waves, is investigated. The incoming water waves are calculated using specific solutions of the nonlinear Schrödinger equation, which can be seen as prototypes of extreme water waves. The corresponding f...

Many relevant structures in engineering are rotationally periodic, meaning that they consist of a discrete number of sectors with the same properties that are circumferentially assembled with cyclic symmetry. Their resonant vibrations can lead to strong fatigue problems, as it is especially known fo...

This study is devoted to the analysis of special nonlinear wave phenomena, emerging in an-harmonic, dissipative Klein-Gordon cyclic chains being subjected to a parametric excitation. In particular, we analyze a special type of spatially extended nonlinear waves, manifested by strong amplitude modula...

A phenomenon called passive self-tuning resonance can be found during excitation of a system consisting of a beam and a moving mass. In this phenomenon, due to the nonlinear coupling between the vibration of the beam and the motion of the mass, the mass can move passively to one of the anti-nodes of...

While recent designs demand structures more prone to geometric nonlinearity, frictional contact can occur in the interaction between adjacent components. The accuracy and efficiency of the Rubin model order reduction technique enhanced with static modal derivatives are investigated for the vibration...

The energy harvesting from mechanical vibrations using a Micro Fiber Composite (MFC) patch and its optimal placement are a main purposes of this paper. The plant consists of a pseudo-conical cantilever shell with opposite curvatures. After applying initial stresses at boundary conditions, the shell ...

This study investigates the concept of clearance-type nonlinear energy sinks (NESs) for the passive mitigation of a model of a five-story shear frame structure subjected to seismic excitation. This is achieved by introducing two local NESs with linear internal restoring springs and dampers, incorpor...

We propose a new concept for the regularization and discretization of transfer and Koopman operators in dynamical systems. Our approach is based on the entropically regularized optimal transport between two probability measures. In particular, we use optimal transport plans in order to construct a f...

In this paper, we investigate the dynamics of particles within a bi-quartic potential well, characterized by the coupled potential function \( V(x, y) = \frac{1}{2}x^2 + \frac{1}{2}y^2 - \frac{1}{4}x^4 - \frac{1}{4}y^4 + Cx^2y^2 \). Our focus is on the safe basins of escape (SBoE) and level-crossing...

The study focuses on targeted energy transfer between two weakly and linearly coupled oscillators. One of the oscillators is subject to time-dependent and nonlinear restoring forcing terms. A previous study (using stochatsic optimization) has demonstrated improved vibration absorption with time-depe...