Article
Mathematics, Interdisciplinary Applications
Bo Yan, Jingjing Yang
Summary: This paper investigates the impact of a dynamic track stabilizer on the vehicle-track-subgrade system during operation and proposes an optimized selection of operating parameters. By discussing the influence of operating parameters on the dynamic characteristics of the ballast bed, a parameterized model is established to optimize the selection of operating parameters.
Article
Engineering, Mechanical
Minghui Yao, Xinfang Wang, Qiliang Wu, Yan Niu, Shaohong Wang
Summary: A nonlinear electromagnetic energy harvester (EMEH) for automobile suspension is designed in this paper. The magnetic flux density and magnet repulsive force are determined by finite element analysis. A dynamic model of a quarter car with the nonlinear EMEH under random road excitation is established. The influence of structure parameters on output characteristics of the nonlinear EMEH is studied. It is found that higher road class and car speed result in better output characteristics of the nonlinear EMEH. Additionally, the introduction of nonlinear magnet repulsive force significantly improves the output power compared to the linear EMEH.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Energy & Fuels
Yuhua Sun, Ping Wang, Jun Lu, Jingmang Xu, Peigen Wang, Shouyong Xie, Yunwu Li, Jun Dai, Bowen Wang, Mingyuan Gao
Summary: This study introduces a sustainable approach for online monitoring of rail corrugation using a self-contained energy harvesting system, which can identify rail corrugation based on vibration energy and induced voltage. This method reduces reliance on environmentally-unfriendly batteries and decreases manual involvement in railway track inspection.
Article
Physics, Applied
Yuang Ji, Maoru Chi, Jungang Yang, Xingwen Wu, Bohan Li, Liangping Hu
Summary: This study establishes a model using COMSOL Multiphysics 5.6 to investigate the influence of irregularities in permanent magnet guideways and bridge deflection on the levitation characteristics of high-temperature superconducting (HTS) maglev trains. The results show that the irregularities and bridge deflection have a coupled effect on levitation characteristics, and the levitation characteristics fluctuate with random excitation.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Engineering, Civil
Xiaonong Wang, Jingyu Huang
Summary: This study focuses on the MLX01 type of electrodynamic maglev train and establishes equivalent circuit models for levitation/guidance. The forces in different directions are solved using the energy method. A field-circuit-motion coupling numerical model is then established for a single bogie and ground coil. Based on this model, the electromagnetic relationships of the maglev train on curved tracks are analyzed. The study explores the electromagnetic spring coefficient and its internal mechanism under different electromagnetic parameters. Considering the coupling characteristics of electromagnetic forces, the levitation force and guidance force under different standard air gaps are analyzed, along with a numerical fitting analysis. Furthermore, the levitation force, guidance force, and drag force characteristics are studied with levitation displacement, guidance displacement, and operation speed under different standard air gaps. The study also analyzes the guidance-drag ratio and levitation-drag ratio. A dynamic model with 20 degrees of freedom is established based on the geometric model of the maglev train. The dynamic characteristics of the bogie and vehicle body under different standard air gaps and speeds are analyzed, considering the track irregularity as the external excitation source. The effects of suspension damping and stiffness coefficients on the vibration characteristics of the vehicle body are also studied. This study provides important theoretical and data support for the design and dynamic analysis of superconducting electrodynamic maglev trains.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Chemistry, Inorganic & Nuclear
Li Li, Li-Min Lu, Shi-Quan Wu, De-Yuan Hu, Tian-Yu Tang, Yan-Lin Tang
Summary: In this study, the geometric properties and infrared spectra of BHT molecule were calculated using density functional theory, and the first 30 excited states were calculated using time-dependent density functional theory. The theoretical and experimental spectra of BHT molecule were found to be in good agreement, with a slight red-shift in the experimental spectrum due to the gas composition in the air. The UV spectrum was mainly formed by transitions from the ground state to excited states, and the excitation types involved local excitation and charge transfer excitation.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Jie Kang, Hehua Ju, Li Liu
Summary: Transmissibility-based operational modal analysis methods have rapidly developed over the last two decades, allowing for extraction of modal parameters from various load cases. Despite their ability to identify modal parameters under non-white excitations, challenges such as robustness under different load conditions and noise influence still exist. The methods are shown to be independent of input spectra under certain conditions, with user-defined parameters playing crucial roles in their identification ability.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Jinlong Wang, Yanhua Liu, Tao Liu, Song Zhang, Zhiting Wei, Bin Luo, Chenchen Cai, Mingchao Chi, Shuangfei Wang, Shuangxi Nie
Summary: In this paper, a high-temperature-resistant triboelectric material is designed based on multilevel non-covalent bonding interactions, achieving an ultra-high surface charge density. TENGs based on this material exhibit higher power output at high temperatures, pointing out a promising direction for the preparation of polymers with excellent triboelectric properties.
Article
Acoustics
Lei Xia, Zhiqiang Liu, Ronghua Huan, Weiqiu Zhu
Summary: A feedback control strategy for accurately tracking a specified stationary probability density function of a nonlinear stochastic dynamic system is proposed in this paper. By splitting the Fokker-Planck-Kolmogorov equation into a probability circulation flow equation and a probability potential flow equation, the control force is divided accordingly. The control efficiency can be regulated by the control parameter C.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Chemistry, Physical
Song Tang, Wenxuan Chang, Gui Li, Jianfeng Sun, Yan Du, Xindan Hui, Qian Tang, Zhihao Hu, Jiaqi Li, Jie Chen, Wencong He, Hengyu Guo
Summary: Efficiently converting random vibration energy into electricity is significant for local power supply in the internet of things. However, the conversion efficiency of energy harvesters is limited by their intrinsic frequency. In this study, a multi-layered, wavy super-structured triboelectric nanogenerator (SS-TENG) is designed to improve output performance through charge excitation. The SS-TENG, with a steel sheet acting as both an electrode and a supporter, achieves a high volume charge density and widened resonant frequency range. It can sustainably drive sensors by harvesting vibration energy, providing an effective strategy for energy harvesting and frequency response broadening.
Article
Engineering, Civil
Lizhong Jiang, Shaohui Liu, Wangbao Zhou, Yu Jian, Peng Kang, Zhenbin Ren
Summary: This paper investigates the impact of stiffness degradation on track dynamic smoothness in the track-bridge system under earthquake conditions. A train-track-bridge system model that considers stiffness degradation is established. The results show the relationship between stiffness degradation and PGA, as well as the effects of various factors on dynamic irregularity.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Xiansong Gao, Qingshan Wang, Xinxiang Liu, Rui Zhong, Bin Qin, Hailiang Xu
Summary: In this paper, an electro-mechanical coupling model based on the Spectral-Tchebychev method (S-T) is proposed to examine the stochastic vibration characteristics of smart piezoelectric structures. The proposed model consumes less computational time than existing methods in predicting the stochastic response. The effect of the piezoelectric layer on the stochastic vibration characteristics of the host structure is also studied.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Mechanical
Roman Weilguny, Martin Leitner, Peter Brunnhofer, Ferdinand Pospischil
Summary: This paper investigates the lateral interaction between a rail vehicle and the track during cases of dynamic gauge widening. A multibody simulation model is used to analyze the influencing parameters and the results reveal that changes in contact geometry caused by rail tilting depend strongly on the specific wheel and rail profiles.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Plant Sciences
Xian Jun Zhang, Yuki Fujita, Ryutaro Tokutsu, Jun Minagawa, Shen Ye, Yutaka Shibata
Summary: This study investigates the in vivo reversible changes in intracellular distribution of chlorophyll fluorescence during light-induced state transitions in Chlamydomonas reinhardtii, using a newly developed noninvasive excitation-spectral microscope technique that provides powerful spectral information about excitation-energy transfer between Chl-a and Chl-b.
PLANT AND CELL PHYSIOLOGY
(2021)
Article
Chemistry, Physical
Kazuhiro J. Fujimoto, Takumi Minoda, Takeshi Yanai
Summary: This study theoretically investigates excited states of two types of bacteriochlorophyll aggregates in photosynthetic light-harvesting complexes, revealing that the spectral redshift of B800 is mainly due to electrostatic interaction while that of B850 is attributed to excitonic coupling. Additionally, interchromophore charge transfer plays a crucial role in the spectral redshift of B850.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Engineering, Mechanical
G. De Pasquale, F. Luceri, M. Riccio
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2019)
Article
Materials Science, Multidisciplinary
G. De Pasquale, F. Luceri, M. Riccio
EXPERIMENTAL MECHANICS
(2019)
Article
Polymer Science
Valentina Bertana, Giorgio De Pasquale, Sergio Ferrero, Luciano Scaltrito, Felice Catania, Carmelo Nicosia, Simone L. Marasso, Matteo Cocuzza, Francesco Perrucci
Review
Engineering, Electrical & Electronic
Giorgio De Pasquale, Valentina Ruggeri
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2019)
Article
Engineering, Mechanical
Giorgio De Pasquale, Alberto Tagliaferri
Summary: The design of lattice structures for additive manufacturing processes requires specialized methods and tools to reduce computational complexity and accurately predict global strength, strain energy dissipation, and stress distribution. Lattice structures are used as impact absorbers in aircraft anti-icing systems to efficiently dissipate kinetic energy, with numerical simulations and experimental characterizations analyzing different variants in the elastoplastic regime to correlate material density, structural strength, and strain energy dissipation to cell shapes and dimensions.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Giorgio De Pasquale, Stefano Sibona
Summary: Metal lattice structures fabricated by additive manufacturing processes combined with polymers exhibit unexpected mechanical properties, with the composite material capable of absorbing elastoplastic energy up to 75% higher than the sum of energies absorbed by each constituent material. The fabrication process for creating reliable and repeatable hybrid components by filling metal lattice with polymer has been introduced and validated.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Review
Chemistry, Analytical
Giorgio De Pasquale
Summary: Additive manufacturing (AM) processes at the micrometer range are undergoing intense development recently, with efforts to integrate them with traditional MEMS fabrication processes and to develop specific design methods for this field. Despite the abundance of documentation on process attempts, setup details, and case studies, organized analysis of the specific and comparative advantages, constraints, and limitations of AM methods for microstructures is necessary due to the diverse variety of processes and materials.
Article
Materials Science, Multidisciplinary
Antonio Coluccia, Gianni Jiang, Guillaume Meyer, Giorgio De Pasquale, Christian Mittelstedt
Summary: This study aims to explore the mechanical properties of lattice structures in order to provide construction guidelines.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Proceedings Paper
Engineering, Aerospace
Antonio Coluccia, Giorgio De Pasquale, Guillaume Meyer, Christian Mittelstedt
Summary: Lattice structures are promising design solutions for lightweight components, offering high efficiency in absorbing impact energy. Additive manufacturing of metals enables innovative approaches where static strength, lightweight, and impact behavior are considered together in design and simulation.
2021 12TH INTERNATIONAL CONFERENCE ON MECHANICAL AND AEROSPACE ENGINEERING (ICMAE)
(2021)
Article
Engineering, Manufacturing
Giulia Bertolino, Marco Montemurro, Giorgio De Pasquale
INTERNATIONAL JOURNAL OF INTERACTIVE DESIGN AND MANUFACTURING - IJIDEM
(2019)
Proceedings Paper
Materials Science, Multidisciplinary
Giorgio De Pasquale, Leonardo Mastrototaro, Valentina Ruggeri
MATERIALS TODAY-PROCEEDINGS
(2019)
Proceedings Paper
Materials Science, Multidisciplinary
Giorgio De Pasquale, Federica Luceri
MATERIALS TODAY-PROCEEDINGS
(2019)
Proceedings Paper
Materials Science, Multidisciplinary
Giorgio De Pasquale, Lorena Zappulla, Luciano Scaltrito, Valentina Bertana
MATERIALS TODAY-PROCEEDINGS
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Giorgio De Pasquale, Leonardo Mastrototaro, Lorenzo Pia, Dalila Burin
2018 SYMPOSIUM ON DESIGN, TEST, INTEGRATION & PACKAGING OF MEMS AND MOEMS (DTIP)
(2018)
Proceedings Paper
Engineering, Mechanical
Giorgio De Pasquale, Valentina Ruggeri
AIAS 2018 INTERNATIONAL CONFERENCE ON STRESS ANALYSIS
(2018)