Article
Acoustics
Pan Fang, Yuanguo Wang, Min Zou, Zhiliang Zhang
Summary: A combined synchronous control strategy is proposed in this study to maintain stability synchronization of three eccentric rotors driven by three induction motors in multi-motor-pendulum vibration systems. Controllers for velocity error, phase error, and coupling error are designed with reaching law algorithm and global sliding mode control, and stability of the control system is validated by the Lyapunov theorem. The effectiveness of the control strategy is verified through numerical simulation, showing better robustness compared to other methods.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Multidisciplinary Sciences
Zahrasadat Momeni, Ashotush Bagchi
Summary: Earthquakes can cause significant damage to constructed structures, and engineers have designed systems to reduce damage and improve vibration control in real-time. A hybrid control system that incorporates semi-active MR dampers is being introduced into isolated highway bridge structures to enhance vibration reduction and overall performance. An adaptive data-driven control algorithm based on evolutionary game theory and multi-objective optimization is proposed to optimize the distribution of voltage to the dampers and provide optimal seismic protection.
Article
Metallurgy & Metallurgical Engineering
Xiao-li Zhang, Guo Yao, Yi-min Zhang
Summary: This paper investigates the vibration properties of a double drum coal shearer, including the vibrations of the motor body and the angle displacements of the rockers. The nonlinear equation of motion is established using Lagrange's equation and the vibration response is calculated using the Runge-Kutta numerical method. The effects of various factors on the vibration properties of the system are discussed.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Engineering, Geological
Hemanta Hazarika, Kentaro Kuribayashi, Shuichi Kuroda, Yutao Hu
Summary: The motivation for this study comes from a tire retaining wall that remained undamaged during the 2011 Tohoku Earthquake in Japan. This paper presents a case study on the performance of the tire retaining wall. Results from field investigations, laboratory experiments, and numerical simulations show that the confining effect, friction, ductility, and damping of the tires contribute to the wall's excellent performance during the earthquake. The study also highlights the isolation mechanism provided by the rubber particles in the tires.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Mechanical
Dan Kielsholm Thomsen, Rune Soe-Knudsen, Ole Balling, Xuping Zhang
Summary: This paper presents a practical set of new tools for identifying and mapping the natural frequencies and damping ratios of dominant vibration modes of a robot arm, reducing residual vibrations effectively. The combination of new methods yields an efficient vibration suppression with great robustness and low-cost computation, reducing residual vibration of the robot manipulator up to 90%.
MECHANISM AND MACHINE THEORY
(2021)
Article
Engineering, Civil
Tobias Friis, Evangelos I. Katsanos, Mogens Saberi, H. Holger H. Koss
Summary: In recent years, there has been a trend towards using structural elements and entire structures with low internal damping in the design of structures and infrastructures, driven by the desire for high functionality and increased aesthetics. The use of friction dampers has become popular due to their relative low cost, high reliability, and efficiency. However, traditional friction dampers are limited in their ability to optimally mitigate vibrations across different magnitude ranges, leading to the development and application of a new two-level friction damper which has shown improved performance in controlling wind- and earthquake-induced vibrations in high-rise buildings.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Junhui Zhang, Cong Zhang, Yi Li, Wen-Shao Chang, Haoyu Huang
Summary: The study investigates the impact of beam-panel connections on the vibration serviceability of CLT floors under multi-person loading. Experimental and numerical analysis reveals that screw size has minimal effect on the dynamic characteristics of the floor, while reducing screw spacing increases the fundamental natural frequency and decreases VDV. A theoretical model and design method for predicting vibration serviceability of CLT floors are proposed.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Geological
Filippo Gatti, Luca Rosafalco, Giorgia Colombera, Stefano Mariani, Alberto Corigliano
Summary: This paper uses adversarial learning technique to generate the transient dynamic response of shear type multi-storey buildings under earthquake ground motion, starting from the relevant undamaged responses. The proposed methodology enables damage classification in shear-type multi-storey buildings and can successfully detect and assess different damage severity levels.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Automation & Control Systems
Jinan Yang, Jialei Deng, Jiahou Zhao, Sujuan Jiao, Xinhua Long
Summary: In this paper, a novel parallel multi-harmonic global multi-channel (MHGMC) control method is proposed to suppress the multi-harmonic vibration components transmitted from the main rotor to the fuselage. The proposed control algorithm shows faster control convergence speed and better control effect of multiple harmonics than the conventional filtered-x least mean square algorithm.
CONTROL ENGINEERING PRACTICE
(2024)
Article
Mechanics
I-Cheng Wang, Yu-Ren Wu, Yiin-Kuen Fuh
Summary: This study establishes an equivalent multi-body dynamics model of a rotary compressor for a household air-conditioner, considering eccentric masses on the crankshaft, cyclic gas loads, torque ripple of the motor, connections with rubber washers, and the intake tube and exhaust tube. Practical experiments are conducted to validate the model's reliability and equivalence, and the design of experiments method is used to determine the optimal counterweights and assembly angle to reduce the compressor vibration.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Aerospace
Mahdi Khosravi, A. B. Novinzadeh
Summary: Flapping wing micro aerial vehicle (FWMAV) has complex multi-body and periodic dynamics, but utilizing a model-free adaptive variable structure control approach can effectively improve control difficulties and achieve trajectory control.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Civil
Xi Wang, Zhenyuan Xu, Dida Wang, Tao Wang, Guoqiang Fu, Caijiang Lu
Summary: This paper presents an optimization design method for variable multi-frequency vibration control using multi-mass dampers (MMDs). The proposed method combines the main tuned mass damper (TMD) and magnetic dampers to effectively suppress vibrations and improve the robustness of the primary system.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Acoustics
Ge Yan, Wen-Hao Qi, Jia-Jia Lu, Feng-Rui Liu, Han Yan, Lin-Chuan Zhao, Zhi-Yuan Wu, Wen-Ming Zhang
Summary: Inspired by the collaborative action of ankle, knee and hip joint, a novel bio-inspired multi joint structure (BIMJS) is proposed for low frequency vibration isolation. The concept of quasi zero stiffness (QZS) is introduced and the effects of posture adjustment and joint stiffness on the isolation performance are investigated. Experimental results show that the BIMJS can effectively isolate vibrations above 2.5 Hz under multiple loads.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Geosciences, Multidisciplinary
Zibo Wang, Ruifeng Liu, Wei Liu
Summary: After the 2008 Wenchuan earthquake, the Longmen-Shan fault zone has experienced frequent seismic activity. This study used seismic data to estimate the source parameters of moderate magnitude events in the Longmen-Shan Fault zone. The results suggest that the earthquakes in this region have high energy release and potential for strong ground shaking.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Multidisciplinary Sciences
Esther Wehrle, Graeme R. Paul, Duncan C. Tourolle Ne Betts, Gisela A. Kuhn, Ralph Muller
Summary: The study demonstrated the significant impact of individualized cyclic mechanical loading on the remodelling phase of fracture healing in a mouse femur defect model. Changes in dynamic parameters led to increased formation of mineralized callus. The maintenance of callus remodelling was associated with distinct effects on molecular targets, showing the potential for further understanding the mechano-molecular regulation of fracture healing phases.
SCIENTIFIC REPORTS
(2021)