Article
Engineering, Mechanical
Mingjing Cai, Wei-Hsin Liao
Summary: This study introduces a method of improving the performance of wrist-worn inertial energy harvesters using a repulsive magnetic spring. Experimental results show that the repulsive magnetic spring can significantly increase the output power of the energy harvester, and the smaller the air gap, the more pronounced the improvement.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Energy & Fuels
Krzysztof Kecik
Summary: This paper focuses on the electromechanical coupling in a magnetic levitation energy harvester and proposes a coil design to modify the coupling. Experimental results show that the proper configuration of the coil can increase energy collection and broaden the resonance operating bandwidth.
Article
Green & Sustainable Science & Technology
Wenzheng Cai, Vesselina Roussinova, Vesselin Stoilov
Summary: This study proposes, designs, and tests a new concept of a small-scale piezoelectric wave energy harvester based on the acceleration-driven principle. Six piezoelectric generators placed in the enclosure are used as energy conversion devices, providing high-frequency response and the ability to withstand large strain. The device can operate at deployment sites with consistent medium/small wave energy flux and naturally float on the water surface. It is lightweight, cost-effective, and suitable for operation in remote rivers and lakes due to its self-generating capability.
Article
Energy & Fuels
Yiqing Yang, Peihao Chen, Qiang Liu
Summary: A coaxial mechanical motion rectifier with a planetary gear train and four one-way clutches is designed to increase transmission ratio, along with the incorporation of a variable inertia flywheel to extend the overrunning phase. Experimental results show that the design is beneficial in improving the output power and efficiency of the wave energy harvester.
Article
Energy & Fuels
Krzysztof Kecik, Marcin Kowalczuk
Summary: This paper investigates the possibility of converting vibrations to electricity and proposes a numerical and experimental study of a magnetic levitation harvester. The results indicate that the nonlinear electromechanical coupling model is more suitable for higher oscillations of the magnet, and recovered energy can be controlled by simple configuration of the magnet coil position.
Article
Thermodynamics
Jun Yu, Decai Li, Shengbin Li, Ziyin Xiang, Zidong He, Jie Shang, Yuanzhao Wu, Yiwei Liu, Run-Wei Li
Summary: This paper proposes an electromagnetic VEH using magnetic fluid (MF) as lubricant and liquid spring, which replaces traditional mechanical or magnetic springs with a liquid spring with variable stiffness coefficient. Planar coils and helical coils are used together to harvest the vibration energy, thereby broadening response frequency, improving energy harvest efficiency, and reducing VEH volume and damping.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Electrical & Electronic
Junwu Kan, Yaqi Wu, Shengjie Li, Shuyun Wang, Zhonghua Zhang
Summary: This paper presents a tunable rotational energy harvester that utilizes magnetic interaction force to enhance robustness and environmental adaptability. The harvester has the simultaneous functionality of frequency tuning and amplitude limiting. An analytical model is established and simulated to analyze the influence of structural parameters on output characteristics. Experimental results verify the feasibility of the proposed harvester, which demonstrates multiple effective rotational speeds and adjustable resonant frequency to adapt to different rotational speed ranges. The maximum power of 9.95 mW is achieved with a matched load resistance of 200 kΩ.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Energy & Fuels
Carlos Imbaquingo, Christian Bahl, Andrea R. Insinga, Rasmus Bjork
Summary: This study investigates the performance of an electromagnetic vibration harvester with variable magnetic stiffness and electromagnetic damping for two-dimensional vibrations. The experimental results show that the energy harvesting efficiency of the device can be improved by adjusting the number of magnets and the dimensions of the coils.
Article
Materials Science, Multidisciplinary
Shoutai Li, Yifeng Wang, Mingjin Yang, Yuhua Sun, Fei Wu, Jun Dai, Ping Wang, Mingyuan Gao
Summary: A Magnetic Levitation Energy Harvester (MLEH) was designed and tested in this study, showing effectiveness in powering rail-side sensors. The device demonstrated a broadband response and had a wide range of output power in sweeping-frequency vibration tests.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2022)
Article
Instruments & Instrumentation
Jiwen Fang, Bo Fan, Chong Li, Mingming Lv
Summary: Low-frequency vibration is widespread in nature and vibration energy harvesting is considered a reliable and sustainable method for continuous power supply. Designing a bio-inspired mechanical structure to improve the efficiency of energy harvesting by mimicking the flapping wing motion of Diptera insects is a feasible approach.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Veenasri Vallem, Erin Roosa, Tyler Ledinh, Woojin Jung, Tae-il Kim, Sahar Rashid-Nadimi, Abolfazl Kiani, Michael D. Dickey
Summary: This research presents a completely soft and stretchable energy harvester that converts mechanical energy to electrical energy by mechanically varying the area of an electrical-double-layer capacitor. Unlike previous methods, this harvester uses liquid-metal electrodes within a hydrogel, and can operate under various modes of deformation.
ADVANCED MATERIALS
(2021)
Article
Automation & Control Systems
Chuan Zhao, Feng Sun, Junjie Jin, Jinghu Tang, Fangchao Xu, Qiang Li, Koichi Oka
Summary: The permanent magnetic levitation system achieves levitation force control through rotating the permanent magnet and variable flux path control mechanism, with lower power consumption; Different levitation control strategies show good quasi-zero power levitation performance in loading experiments, and constant air gap control demonstrates higher safety.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Engineering, Electrical & Electronic
Junjie Xu, Yonggang Leng, Fei Sun, Xukun Su, Xiaoyu Chen
Summary: A novel tri-magnet levitation bi-stable electromagnetic energy harvester is proposed, using a single-sided bipolar ring magnet to realize the bi-stable nonlinear mechanism. The potential energy variation is investigated to balance the asymmetric potential wells caused by the self-weight of the levitating magnet. Experimental results show that the device has a tunable operating bandwidth and a wider bandwidth requires sacrificing output power.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
Tao Wang, Shiqiang Zhu
Summary: This work combines a magnetic multi-stable mechanism with a pendulum vibration energy harvester to widen its bandwidth, especially in low-frequency operation. Experimental results demonstrate the effectiveness of the proposed structure in enlarging frequency bandwidth and provide a promising solution for energy harvesting in low-frequency applications such as ocean wave.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Green & Sustainable Science & Technology
Lipeng He, Renwen Liu, Xuejin Liu, Zheng Zhang, Limin Zhang, Guangming Cheng
Summary: A novel piezoelectric wave energy harvester based on cylindrical-conical buoy structure and magnetic coupling is proposed in this paper, which can be used to power monitoring sensors on offshore work platforms and bridges. The efficiency of wave energy conversion can be improved by optimizing the design of the buoy and utilizing magnetic coupling. Experimental findings demonstrate that the device can effectively generate energy when subjected to wave excitation.
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)