Article
Engineering, Mechanical
Shuai Wang, Fangchao Wang, Hong-yong Chen, Changjun Zheng, Chuanxing Bi
Summary: This paper parametrically studies the vibration attenuation characteristics and energy dissipation mechanism of Dynamic Vibration Absorbers Array (DVAA) for tuned and mistuned integrally bladed disk (blisk), considering both viscous and frictional damping. An analytical power flow formula is derived for the dynamic interaction between blisk and DVAA. The numerical results show that a light DVAA can significantly reduce the resonant amplitudes of both tuned and mistuned blisk.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Jafar Aghayari, Saeed Bab, Pedram Safarpour, Abbas Rahi
Summary: This study evaluates the application of nonlinear energy sinks for passive vibration attenuation of blades on a real bladed disk, and investigates the coupling between blades and the disk in different modes through finite element analysis and reduced order model. Results show that the performance of nonlinear energy sinks varies in different modes due to the coupling between blades and the disk.
MECHANISM AND MACHINE THEORY
(2021)
Article
Engineering, Civil
Said Elias, Rajesh Rupakhety, Dario De Domenico, Simon Olafsson
Summary: The study investigates the seismic response control of bridges using nonlinear tuned vibration absorbers (n-TVAs) by comparing them with optimum linear TVAs (o-TVAs) and elasto-plastic bilinear TVAs (bn-TVAs). Results show that n-TVAs are as effective as o-TVAs in controlling structural response, providing a more economical solution without the need for additional dashpots, although their stroke is comparable to that of o-TVAs.
Article
Acoustics
E. Delhez, F. Nyssen, J. -c. Golinval, A. Batailly
Summary: This paper presents a method for reduced order modeling of turbomachine bladed structures, taking into account both geometric nonlinearity and nonlinear blade-tips/casing contacts. The methodology uses modal derivatives to study contact interactions and is later expanded to full bladed disks using Component Mode Synthesis techniques. The numerical strategy is applied and validated on an industrial compressor bladed disk model.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Mechanics
Samuel Quaegebeur, Benjamin Chouvion, Fabrice Thouverez
Summary: This study investigates the use of friction nonlinearities to reduce vibratory energy and extend the lifespan of bladed disk systems, proposing a reduction strategy for handling complex nonlinear models. With the use of the Dynamic Lagrangian Frequency Time algorithm to capture nonlinear effects, the impact of underplatform dampers on bladed disk systems was explored.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Acoustics
Houxin She, Chaofeng Li, Qiansheng Tang, Bangchun Wen
Summary: This study investigates the eigenvalues of veering and merging phenomena in an assembly bladed disk system, as well as the interactions between disk-dominated and blade-dominated modes. Through numerical analysis using modal functions and frequency-domain methods, it is found that coupling interactions induce various phenomena, with modal frequencies at low rotational speeds significantly affected by nonlinearity.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Mechanical
Anthony Tacher, Fabrice Thouverez, Jason Armand
Summary: The interaction between the Coriolis and mistuning effects on a finite-element model of a simplified bladed drum compressor was investigated in this paper. The impact of the Coriolis effect was highlighted, and the global dynamic behavior with rotational speed was studied for different excitation frequencies and engine orders. A better understanding of the interaction between the Coriolis and mistuning effects was achieved through in-depth investigation of the blisk. The results showed strong mistuning effects and the appearance of traveling waves in blade-dominated responses and modes close to the veering regions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Lorenzo Pinelli, Francesco Lori, Michele Marconcini, Roberto Pacciani, Andrea Arnone
Summary: The paper introduces a numerical method based on a modal work approach to evaluate the forced response of bladed disks, and validates it against results obtained by a commercial FEM code. The successful validation of the method creates the opportunity to include the tool in an integrated multi-objective process to account for aeromechanical aspects.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Giuseppe Battiato, Christian M. Firrone
Summary: This paper discusses a stress recovery algorithm for identifying strains and stresses in a nonlinear forced response analysis on a ROM. The algorithm is applied to a bladed disk with friction contacts, allowing for the study of its behavior in standard linear analyses in commercial FE software.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Mechanical
Anthony Tacher, Fabrice Thouverez, Jason Armand
Summary: This paper investigates the influence of the Coriolis effect on the aeroelastic stability of a single-piece bladed disk and highlights the complex interactions between flutter, mistuning, and the Coriolis effect. A genetic algorithm is used to determine the best detuning pattern, and it is shown that considering the Coriolis effect is necessary to ensure stability to flutter.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
M. Cera, M. Cirelli, E. Pennestri, P. P. Valentini
Summary: This investigation focuses on the analysis of the rollers' dynamics and their influence on the system in modern centrifugal damper architectures. More refined linear tuning conditions and nonlinear design procedures are proposed, and numerical tests demonstrate the sensitivity of the system dynamics to the design parameters of the rollers.
MECHANISM AND MACHINE THEORY
(2022)
Article
Chemistry, Applied
Frederic Castet, Adrien Gillet, Filip Bures, Aurelie Plaquet, Vincent Rodriguez, Benoit Champagne
Summary: This study investigates the linear and nonlinear optical properties of a series of A-shaped derivatives and demonstrates that these compounds possess two low-lying excited electronic states close in energy, contributing additively to the first hyperpolarizability with a dominant dipolar character. The NLO responses significantly deviate from Kleinman's index permutation symmetry, as shown through both experimental and theoretical analyses.
Article
Mathematics, Interdisciplinary Applications
Chuan Guo, Albert C. J. Luo
Summary: This paper studies the existence, bifurcations, and stability of higher-order complex periodic motions in a nonlinear, electromagnetically tuned mass damper system. The authors present three branches of period-3 motions, one branch of period-9 motions, and one branch of period-12 motion in such a system. The frequency-amplitude characteristics for bifurcation routes of these higher-order periodic motions are determined. The study on periodic motions provides insights into the dynamical behaviors of the system and can contribute to the development and design of vibration reduction and energy harvesting systems.
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
(2022)
Article
Mathematics, Applied
Jia-Huan Guo, Rui Guo
Summary: This paper investigates two types of fourth-order nonlinear nonlocal Schrodinger (NLS) equations, namely the fourth-order nonlocal reverse space and reverse space-time NLS equations, by using two symmetric reduction conditions. For the former case, one-and N-fold Darboux Transformations (DTs) are constructed to obtain both symmetry preserving and broken solutions, and the collision scenarios of dark and anti-dark soliton solutions are studied. Quasi-determinants are used to express this process. For the latter case, one-and N-fold DTs are constructed, and different types of exact solutions, such as soliton, breather, and rogue wave solutions, are obtained under nonlocal constraints, which differs from the classical case.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Mathematics
Michal Stas
Summary: The paper aims to establish the crossing numbers of join products of paths and cycles on n vertices with a connected graph on five vertices, including adding some edges to determine the crossing numbers of join products of other graphs with paths and cycles on n vertices.
Article
Acoustics
Jimmy S. Issa, Steven W. Shaw
JOURNAL OF SOUND AND VIBRATION
(2015)
Article
Multidisciplinary Sciences
Suguang Dou, B. Scott Strachan, Steven W. Shaw, Jakob S. Jensen
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2015)
Article
Multidisciplinary Sciences
Calvin R. Chen, George I. Makhatadze
NATURE COMMUNICATIONS
(2017)
Editorial Material
Engineering, Mechanical
Angelo Luongo, Haiyan Hu, Ju H. Park, Steven W. Shaw
NONLINEAR DYNAMICS
(2019)
Article
Physics, Applied
James M. L. Miller, Dongsuk D. Shin, Hyun-Keun Kwon, Steven W. Shaw, Thomas W. Kenny
APPLIED PHYSICS LETTERS
(2020)
Article
Engineering, Mechanical
Donghao Li, Steven W. Shaw
NONLINEAR DYNAMICS
(2020)
Article
Engineering, Mechanical
Oriel Shoshani, Steven W. Shaw
Summary: This paper explores the nonlinear interactions between vibration modes in micro- and nanoscale mechanical resonators, focusing on the regular, robust, and predictable dynamics. By using relatively simple two-mode models and combining model analysis with experimental observations, the paper supports suggestions for future research directions in the field.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Electrical & Electronic
James M. L. Miller, Gabrielle D. Vukasin, Ze Zhang, Hyun-Keun Kwon, Arun Majumdar, Thomas W. Kenny, Steven W. Shaw
Summary: The clamping loss in micromechanical resonators depends on the boundary conditions and can be tuned by modifying the chip's boundary conditions. Experimental results show that suspending the chip to minimize frame contact significantly increases the quality factor of microcantilevers and bulk-mode resonators.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2022)
Article
Physics, Applied
Jaesung Lee, Steven W. Shaw, Philip X. -L. Feng
Summary: This study experimentally demonstrates giant parametric amplification and spectral linewidth narrowing in atomically thin NEMS resonators. These findings suggest rich opportunities for controlling oscillations in 2D NEMS through parametric and nonlinear effects, opening up possibilities for creating high-performance, thin resonators and oscillators for signal transduction and sensing.
APPLIED PHYSICS REVIEWS
(2022)
Article
Physics, Multidisciplinary
Martial Defoort, Sebastien Hentz, Steven W. Shaw, Oriel Shoshani
Summary: This study investigates the amplitude stabilization in a synchronized noisy nonlinear oscillator. The authors show that the phase difference between the tones plays a critical role in the amplitude level, and in the strongly nonlinear regime, the amplitude fluctuations are considerably reduced. These findings reveal a new facet of the synchronization phenomenon and suggest a new means to enhance oscillator amplitude stability.
COMMUNICATIONS PHYSICS
(2022)
Article
Engineering, Mechanical
Valery Pilipchuk, Steven W. Shaw, Nabil Chalhoub
Summary: This paper discusses the principles of moving mass control of an artificial dumbbell shaped satellite in order to implement non-jet actuation by varying the satellite's geometry. By controlling the satellite's orientation on the orbit, the total orbital energy can accurately track its desired target according to the suggested control strategies.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Mechanical
Steven W. Shaw, Sahar Rosenberg, Oriel Shoshani
Summary: Models for nonlinear vibrations often use polynomial terms to simulate nonlinear phenomena. The analysis of symmetric systems with cubic stiffness terms is common, and the inclusion of asymmetric quadratic terms is known to modify the effect of cubic nonlinearity in weakly nonlinear systems. However, in many cases, a monotonic dependence is not observed, requiring the use of techniques for strongly nonlinear systems or higher-order terms and perturbation methods.
NONLINEAR DYNAMICS
(2023)
Article
Physics, Multidisciplinary
Oriel Shoshani, Steven W. Shaw
Summary: This article provides a simplified conceptual model to describe and design the nonlinear interactions between modes with different characteristic frequencies, and the generation of tunable frequency comb structures.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Applied
Cristian Cassella, Scott Strachan, Steven W. Shaw, Gianluca Piazza
APPLIED PHYSICS LETTERS
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Yushi Yang, Eldwin Ng, Pavel Polunin, Yunhan Chen, Scott Strachan, Vu Hong, Chae Hyuck Ahn, Ori Shoshani, Steven Shaw, Mark Dykman, Thomas Kenny
2015 28TH IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2015)
(2015)