Article
Chemistry, Analytical
Aimin Deng, Maosen Cao, Qitian Lu, Wei Xu
Summary: An enhanced TPF approach is proposed for the identification of multiple cracks in composite laminated beams. Experimental validation using non-contact vibration measurement confirms the feasibility of the approach.
Article
Mechanics
Masoud Kharazan, Saied Irani, Mohammad Ali Noorian, Mohammad Reza Salimi
Summary: The study investigates the nonlinear vibration behavior of a cantilever beam with multiple breathing cracks, with calculations of stiffness, evaluation of damping variation, and simulation of bilinear behavior using a polynomial function. Results show that beams with a higher number of cracks or deeper ones exhibit obvious softening behavior, leading to a more significant jumping in the response.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Mathematics
Tareq Al-hababi, Nizar Faisal Alkayem, Huaxin Zhu, Li Cui, Shixiang Zhang, Maosen Cao
Summary: The paper investigates the impact of breathing cracks on the dynamic response of beam structures and proposes the use of higher-order time-domain transformations to detect and localize these non-Gaussian features.
Article
Mechanics
J. Prawin
Summary: This paper presents a generalized vibration-based multiple breathing crack localization technique in beams with an unknown number of cracks based on singular spectrum analysis (SSA). The proposed SSA approach can effectively localize closely spaced or sparsely spaced (i.e., spatially far apart) multiple cracks in the beam. It is data-driven, works with limited sensors, and does not need reference healthy state measurements.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Multidisciplinary
Hossein Darban, Raimondo Luciano, Michal Basista
Summary: In this study, a nonlocal model is proposed to investigate the size-dependent free transverse vibrations of nanobeams with cracks. The model takes into account the effect of cracks by introducing discontinuities in slope and transverse displacement at the cracked cross-section. The results show that the crack location, crack length, and nonlocality have an impact on the natural frequencies of the nanobeams, and the cracks can cause amplification and shielding effects on the natural frequencies.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2022)
Article
Engineering, Mechanical
Huile Li, Tianyu Wang, Gang Wu
Summary: This paper proposes a novel semi-analytical approach for nonlinear vibration analysis of beam-like bridges with breathing cracks subjected to vehicular loading. The dynamic interactions between the vehicle and cracked bridge are taken into account. The approach utilizes the Dirac's delta function to represent the local stiffness change at the crack location and obtains closed-form solutions of mode shapes. The nonlinear dynamic equation of the vehicle-cracked bridge interaction system is established and solved through a double-iterative numerical scheme. The proposed approach is validated by comparing the results with those from the literature and is shown to effectively obtain the nonlinear vibration characteristics and dynamic responses of the beam-like bridge with different crack parameters, vehicle speeds, and bridge surface irregularities.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Tianyu Wang, Mohammad Noori, Wael A. Altabey
Summary: This paper presents a novel method for crack detection in Euler-Bernoulli beams based on Bayesian inference using closed-form solution of mode shapes. The expression of vibration modes is derived analytically with the crack parameters as unknown variables. Bayesian inference is utilized to obtain the probability density function of crack parameters and validate the effectiveness of the method through numerical examples.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2021)
Article
Engineering, Mechanical
Hernan Garrido, Ramon Codina, Fernanda de Borbon, Daniel Ambrosini
Summary: In this paper, a new method for damage identification in beams is proposed, which is vibration-based and Output-Only, but does not rely on Modal or Fourier analysis. The method uses the Synthesis of the Healthy-Structure Model Response and interprets the accelerations in free-vibration as an inertial pseudo-loading. The results of an experimental example show outstanding detection and localization performance with low quantification error.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Chemistry, Analytical
Jianzhi Li, Bohao Shen, Junjie Wang
Summary: This study proposes a new method that combines fully distributed fiber optic sensors with fiber Bragg gratings to accurately locate structural damage. Experimental results demonstrate the effectiveness of this method in monitoring the generation and localization of beam cracks.
Article
Engineering, Mechanical
J. Prawin
Summary: This paper presents a spectral correlation approach for the localization of multiple breathing cracks on beams using vibration data. Numerical and experimental results show that the proposed method can effectively localize multiple breathing cracks with different severities at various spatial positions in the beam.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Civil
Yien Wang, Mingshan Yang, Xiangyu Li, Tengfei Xu
Summary: This paper systematically studies the steady-state forced vibrations of nanobeams weakened by multiple vertical cracks. The Green's functions for beams with one crack are obtained by using variable separation and Laplace transform methods. The Green's functions for beams with an arbitrary number of cracks are obtained by using the massless elastic spring model and the transfer matrix method. The influence of statistical parameters on the dynamic responses of the weakened beams is also studied.
THIN-WALLED STRUCTURES
(2023)
Article
Acoustics
Marta Zamorano, Maria Jesus Gomez Garcia, Cristina Castejon
Summary: There are various methods available to detect and diagnose defects in mechanical components during operation, with the latest ones involving intelligent classification systems and pattern evaluation. The article introduces the wavelet packet transform for evaluating the condition of rotating elements, along with a detailed methodology for selecting the mother wavelet.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Engineering, Mechanical
Celia Hameury, Giovanni Ferrari, Abdulaziz Buabdulla, Tarcisio M. P. Silva, Prabakaran Balasubramanian, Giulio Franchini, Marco Amabili
Summary: Positive Position Feedback (PPF) is an active vibration control algorithm commonly used for vibration reduction in thin-walled structures. Fractional order PPF (FOPPF) is a recent development that improves the spillover characteristics through the use of fractional calculus. However, current literature on FOPPF lacks consideration for multiple-input-multiple-output (MIMO) systems and lacks experimental work. To address this gap, a MIMO FOPPF control architecture was tested numerically and experimentally on a cantilever composite sandwich beam.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mathematics
Luis Gerardo Trujillo-Franco, Nestor Flores-Morita, Hugo Francisco Abundis-Fong, Francisco Beltran-Carbajal, Alejandro Enrique Dzul-Lopez, Daniel Eduardo Rivera-Arreola
Summary: This study investigates the vibration attenuation capability of a building-like structure using a dynamic vibration absorber in cantilever flexible beam configuration. The effects of gravity are taken into account. The study proposes the use of the Hilbert transform to determine the tuning conditions between the vibration absorber and the primary system. The results show that the nonlinearities in the dynamic model do not significantly affect the performance of the absorber.
Article
Acoustics
Sandip Chajjed, Mohammad Khalil, Dominique Poirel, Chris Pettit, Abhijit Sarkar
Summary: This paper reports the generalization of the Bayesian formulation of the flutter margin method, which improves the predictive performance by incorporating the joint prior of aeroelastic modal parameters. The improved algorithm reduces uncertainties in predicting flutter speed and can cut cost by reducing the number of flight tests.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pascal Zeise, Bernhard Schweizer
Summary: Air ring bearings are an improved version of classical air bearings, providing better damping behavior and allowing operation above the linear threshold speed of instability. However, there is a risk of dangerous vibrations in certain rotor systems, which can be addressed by considering ring tilting effects.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Zbynek Sika, Jan Krivosej, Tomas Vyhlidal
Summary: This paper presents a novel design of a compact six degrees of freedom active vibration absorber with six identical eigenfrequencies. The objective is to completely suppress the vibration of a machine structure with six motion components. By utilizing a Stewart platform structure equipped with six active legs, a spatial unifrequency absorber with six identical eigenfrequencies is achieved. The design is optimized using a correction feedback and active delayed resonator feedback.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kai Li, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel light-powered self-oscillating liquid crystal elastomer (LCE) bow that can self-oscillate continuously and periodically under steady illumination. The dynamics of the LCE bow are theoretically investigated and numerical calculations predict its motion regimes. The suggested LCE bow offers potential advantages in terms of simple structure, customizable size, flexible regulation, and easy assembly.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Carmelo Rosario Vindigni, Giuseppe Mantegna, Calogero Orlando, Andrea Alaimo
Summary: In this study, a simple adaptive flutter suppression system is designed to increase the operative speed range of a wing-aileron aeroelastic plant. The system achieves almost strictly passivity by using a parallel feed-forward compensator implementation and the controller parameters are optimized using a population decline swarm optimization algorithm. Numerical simulations prove the effectiveness of the proposed simple adaptive flutter suppression architecture in different flight scenarios.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Nicco Ulbricht, Alain Boldini, Peng Zhang, Maurizio Porfiri
Summary: The quantification of fluid-structure interactions in marine structures is crucial for their design and optimization. In this study, an analytical solution for the free vibration of a bidirectional composite in contact with a fluid is proposed. By imposing continuity conditions and boundary conditions, the coupled fluid-structure problem is solved and applied to sandwich structures in naval construction, offering insights into the effects of water on mode shapes and through-the-thickness profiles of displacement and stress.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Shahram Hadian Jazi, Mostafa Hadian, Keivan Torabi
Summary: Non-uniformity and damage are the main focus in studying vibrations of beam elements. An exact closed-form explicit solution for the transverse displacement of a nonuniform multi-cracked beam is introduced using generalized functions and distributional derivative concepts. By introducing non-dimensional parameters, the motion equation and its closed-form solution are obtained based on four fundamental functions. The impact of crack count, location, intensity, and boundary conditions on natural frequency and mode shape is evaluated through numerical study.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Eugenio Tramacere, Marius Pakstys, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Torbjoern A. Lembke
Summary: This paper proposes the experimental stabilization of electrodynamic maglev systems by means of passive components, providing key technological support for the Hyperloop concept of high-speed and sustainable transportation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pengfei Deng, Xing Tan, He Li
Summary: In this paper, the authors improve the surface morphology method and study the bit-rock interaction model between the rock and the PDC bit, taking into account the impact of blade shape and cutter arrangement. They establish a dynamic model for a deep drilling system equipped with an arbitrary shape PDC bit and propose a stability prediction method. The results show that the shape of the blades and arrangement of the cutters on the PDC bit significantly affect the nonlinear vibration of the drilling system.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Salvador Rodriguez-Blanco, Javier Gonzalez-Monge, Carlos Martel
Summary: In modern LPT designs, the simultaneous presence of forced response and flutter in different operation regimes is unavoidable. Recent evidence suggests that the traditional linear superposition method may be overly conservative. This study examines the flutter and forced response interaction in a realistic low pressure turbine rotor and confirms that the actual response is much smaller than that predicted by linear superposition.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kabilan Baskaran, Nur Syafiqah Jamaluddin, Alper Celik, Djamel Rezgui, Mahdi Azarpeyvand
Summary: This study investigates the impact of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers used in urban air mobility vehicles. The results show that different blade numbers exhibit distinct noise levels, providing valuable insights for further research on propeller noise and aerodynamic performance.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yongbo Peng, Peifang Sun
Summary: This study focuses on the reliability-based design optimization (RBDO) of the tuned mass-damper-inerter (TMDI) system under non-stationary excitations. The performance of the optimized TMDI system is evaluated using probability density evolution analysis. The results demonstrate the technical advantages of TMDI, including high vibration mitigation performance, considerable mass reduction, and less stroke demand.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Guanfu Lin, Zhong-Rong Lu, Jike Liu, Li Wang
Summary: Vision-based measurement is an emerging method that enables full-field measurement with non-contact and high spatial resolution capabilities. This paper presents a single-camera method for measuring out-of-plane vibration of plate structures using motion-parametric homography to capture image variation and displacement response.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Bronislaw Czaplewski, Mateusz Bocian, John H. G. Macdonald
Summary: Despite two decades of study, there is currently no model that can quantitatively explain pedestrian-generated lateral forces. This research proposes a foot placement control law based on empirical data to calibrate and generalize the rigid-leg inverted pendulum model (IPM) for predicting lateral structural stability.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Justine Carpentier, Jean-Hugh Thomas, Charles Pezerat
Summary: This paper proposes an improved method for the identification of vibration sources on a car window using the corrected force analysis technique. By redefining inverse methods in polar coordinates, more accurate results can be obtained.
JOURNAL OF SOUND AND VIBRATION
(2024)