Article
Engineering, Ocean
Yin Zhang, Jun Guo, Yaoguo Xie, Jiang Xu
Summary: A novel method for hull girder damage identification based on mode curvature shapes (MCS) is proposed in this paper, and its effectiveness is validated through experiments. The results show that this method has good damage localization ability, but there is some error when quantifying tiny damage.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Multidisciplinary
Qiaoyu Ma, Mario Solis, Jose Daniel Rodriguez-Mariscal, Pedro Galvin
Summary: This paper presents a damage identification method for beam-type structures based on wavelet analysis, utilizing Damage Locating Index (DLI) and Damage Severity Index (DSI) to determine the location and severity of damage. The method is applicable with relatively few measurement points and can use reference values from static analysis for damage evaluation.
Article
Construction & Building Technology
Yang Yang, Zhewei Wang, Bing Xian, Hwa Kian Chai, Zhou Yu, Yao Zhang, Tao Zhu
Summary: In recent times, there has been an increase in high-rise buildings due to economic growth and construction technology advancements. Assessing the structural integrity of these buildings is important but existing methods require a baseline, which is challenging to obtain in practical scenarios. This study introduces a baseline-free method for detecting reduction in lateral stiffness of high-rise buildings.
STRUCTURAL CONTROL & HEALTH MONITORING
(2023)
Article
Acoustics
Shengbo Shan, Li Cheng
Summary: The study proposed a two-dimensional incipient damage localization method based on a newly discovered wave phenomenon, successfully achieving damage localization through damage-induced nonlinear wave scattering features and a dedicated localization algorithm.
Article
Multidisciplinary Sciences
Geon Ha Kim, Bori R. Kim, Min Young Chun, Kee Duk Park, Soo Mee Lim, Jee Hyang Jeong
Summary: The study found that TGA patients showed increased functional connectivity in the SN and decreased connectivity in the DMN within 24 hours of onset, while relatively preserved connectivity was observed in the CEN. Over time, alterations in connectivity were seen in the SN or DMN, but were normalized 3 months after onset.
SCIENTIFIC REPORTS
(2021)
Article
Mechanics
Dong Zhang, Bin Yang, Jianping Tan, Yabin Jin, Biao Xiao, Guang Xian, Xiaolong Xue, Yan Li
Summary: This paper investigates a novel ERCM technique for damage localization and mode identification in CFRPs under normal impact load with energies of 50 and 80 J, successfully achieving accurate imaging of damage positions and prediction of damage modes based on the linear relationship between electrical resistance, incident energy, and panel thickness.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Xin Guo, Yongchang Jiang, Cheng Li
Summary: This article reports a mode-localized airflow sensor with tunable parametric sensitivity using electrically coupled double-ended tuning forks. By adjusting the polarization voltage between the two resonant units, the coupling stiffness of the weakly coupled resonant system can be changed, thereby optimizing the output characteristics of the sensor. Experiment results show that reducing the polarization voltage within a certain range improves the mechanical sensitivity of the sensor, but too low or too high polarization voltage leads to severe mode aliasing or deteriorated output linearity. When the polarization voltage is set to 30 V, the tested prototype achieves high mechanical sensitivity and detection threshold.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Applied
Toky Rabenimanana, Fehmi Najar, Mehdi Ghommem, Vincent Walter, Najib Kacem
Summary: This study investigates MEMS devices made of mechanically coupled microbeams under electric actuation, showing that slight changes in DC voltage bias significantly affect frequency response, and developing a mathematical model for simulation. Furthermore, jumps in deflection due to mass perturbation can enhance the sensitivity of MEMS mass sensors.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Multidisciplinary
Andrzej Katunin
Summary: This paper introduces a novel approach for damage identification in structures based on the S-transform, which shows high sensitivity to structural damage and significantly reduces boundary effects compared to traditional methods.
Article
Health Care Sciences & Services
Chiwon Ahn, Young Taeck Oh, Yeonkyung Park, Jae Hwan Kim, Sojune Hwang, Moonho Won
Summary: This observational study in South Korea explored the relationship between the floor level of out-of-hospital cardiac arrest (OHCA) and survival outcomes. Despite longer emergency response times, higher floor levels were associated with better survival rates. Multiple logistic regression analysis identified age, witnessed OHCA, shockable rhythm, and prehospital return of spontaneous circulation (ROSC) as primary determinants of survival. The study emphasizes the importance of tailored emergency response strategies in high-rise buildings.
JOURNAL OF PERSONALIZED MEDICINE
(2023)
Article
Engineering, Electrical & Electronic
Zheng Wang, XingYin Xiong, KunFeng Wang, WuHao Yang, BoWen Wang, ZhiTian Li, XuDong Zou
Summary: This paper presents a mode-localized resonant accelerometer (ML-RXL) that uses a novel-designed micro-lever mechanical coupler to enhance the sensitivity. By optimizing the anchor design or the critical dimension of the micro-lever, the coupling strength between the resonators can be effectively weakened. Simulation and experimental results confirm the superior performance of the ML-RXL.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Mechanical
M. G. Masciotta, D. Pellegrini
Summary: This paper investigates the correlation between localized damage and global modal complexity indices in structural systems. A new index for damage localization and quantification is formulated and validated against real data through numerical and experimental analysis. The study shows how localized damage affects global modal complexity and proposes a new method for damage assessment.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Analytical
Zhiwen Lu, Feng Li, Shancheng Cao, Rui Yuan, Yong Lv
Summary: A novel crack localization method for operating rotors is proposed, which can accurately and robustly achieve multi-crack localization without baseline information, and eliminate common interferences.
Article
Engineering, Multidisciplinary
X. Y. Li, S. J. Lin, S. S. Law, Y. Z. Lin, J. F. Lin
Summary: The article discusses the limitations of existing algorithms and damage indices for damage diagnosis, highlighting the potential benefits of combining different evaluation methodologies. By analyzing various test results, it is possible to enhance the final structural damage information effectively.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Anna Gorgogianni, Jan Elias, Jia-Liang Le
Summary: This study proposes a mechanism-based model to mitigate the spurious mesh sensitivity in stochastic finite element simulations of quasibrittle fracture. The model uses localization parameters to describe the evolution of damage pattern and adjusts energy regularization schemes and mesh dependence of probability distribution functions based on different damage patterns. The results show that probability distribution functions of constitutive properties must be linked to the damage pattern to effectively reduce the spurious mesh sensitivity.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
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)