Article
Instruments & Instrumentation
Kun Zhang, Bo Zhang, Wei Feng, Zongyao Liu, Huipeng Shen, Baoguo Liu
Summary: This paper proposes an electromagnetic vibration energy harvester (EVEH) based on a diamagnetic levitation system for harvesting ultralow-frequency, broadband vibration energy. The harvester utilizes a diamagnetic levitation structure to reduce the operating frequency and mechanical impact to broaden the working bandwidth. Experimental results show that the harvester can efficiently operate in an ultralow-frequency, random, and large-amplitude-vibration environment, with a maximum peak-to-peak voltage of 370 mV over a wide frequency range of 3-16 Hz at 1 g acceleration, and an RMS output power of 26.7 mu W at the excitation frequency of 6 Hz.
SENSORS AND MATERIALS
(2023)
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
Thermodynamics
Hu Lou, Tao Wang, Shiqiang Zhu
Summary: This paper develops a novel biaxial pendulum vibration energy harvester that can adapt to different directions of vibration excitation by allowing the pendulum to rotate around two axes. Magnets and coils are distributed on the surfaces of the pendulum and the shell to achieve a compact structure. The relationship between the vibration excitation and the output voltage is modeled based on dynamics and electromagnetic analysis, and the accuracy of the model is verified through testing of a small-scale prototype.
Article
Energy & Fuels
Wonil Kwak, Yongbok Lee
Summary: This study focuses on improving the energy efficiency of a piezoelectric energy harvester with a novel fractal structure by optimizing a model and investigating coupling coefficients. The fractal design efficiently converts energy responses at various frequencies.
Article
Engineering, Electrical & Electronic
Carlos Imbaquingo, Christian Bahl, Andrea R. Insinga, Rasmus Bjork
Summary: This article presents an elliptically shaped electromagnetic vibration energy harvester that can tune the resonance frequency easily. The harvester consists of a free-to-move ring-shaped permanent magnet, elliptically distributed cube magnets in a fixed holder, and two coil windings above and below the harvester. When subjected to vibrations, the ring magnet moves until it is pushed back by the magnetic force from the fixed cube magnets, inducing an electromagnetic force on the fixed coils. Experimental results show that the harvester has two resonant frequencies at 4.5 Hz and 7 Hz, generating around 1.5 mW of power.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Mechanical
V. De Biagi, B. M. Chiaia, G. C. Marano
Summary: Linear energy harvesters have a narrow frequency bandwidth and efficient operation relies on the excitation frequency close to the fundamental frequency. Nonlinearity in electromechanical devices is proposed to extend the bandwidth. This study optimizes a Duffing-type nonlinear energy harvester to reduce its size while maintaining power output.
PROBABILISTIC ENGINEERING MECHANICS
(2023)
Article
Engineering, Mechanical
Donglin Zou, Keyu Chen, Zhushi Rao, Junyi Cao, Wei-Hsin Liao
Summary: This study develops a novel quad-stable energy harvester (QEH) with user-defined equilibrium point coordinates. By programming these coordinates, high-performance QEHs can be developed and personalized for different vibration environments. The designed QEH shows high average output power, normalized power density, and operating frequency range.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Electrical & Electronic
Kun Zhang, Haojie Zhao, Wei Feng, Zhaoyun Wu, Baoguo Liu
Summary: In this paper, a typical diamagnetic levitation system composed of a NdFeB permanent magnet array and pyrolytic graphite sheet is built. The levitation mechanism of the system is analyzed theoretically, and the main factors affecting the static levitation are determined. Furthermore, dynamic and numerical simulation models are established, and the dynamic response characteristics of the pyrolytic graphite sheet are analyzed under different vibration excitation. This study provides a reference for developing applications based on the diamagnetic levitation system.
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
(2023)
Article
Chemistry, Analytical
Long Zhang, Hang Shao, Jiaxiang Zhang, Deping Liu, Kean C. Aw, Yufeng Su
Summary: This paper presents an improved solution for the airflow energy harvester based on the push-pull diamagnetic levitation structure. With the adoption of a four-notch rotor, the offset of the floating rotor is eliminated and the energy conversion rate is substantially increased. Experimental results show that the four-notch rotor outperforms the three-notch rotor with higher peak voltage and rotation speed, leading to improvements in the energy conversion factor, output power, and energy conversion rate of the harvester.
Article
Thermodynamics
Kangqi Fan, Jin Liu, Danmei Wei, Daxing Zhang, Yun Zhang, Kai Tao
Summary: A novel method for converting ambient vibrations into efficient rotational energy using the 'cantilever-plucked rotor' mechanism is introduced, which can generate high output power under different vibration conditions through a new plectrum design.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Ge Shi, Jubing Xu, Yinshui Xia, Wentao Zeng, Shengyao Jia, Qing Li, Xiudeng Wang, Huakang Xia, Yidie Ye
Summary: This paper presents a novel wearable vibration energy harvester that combines piezoelectric and electromagnetic mechanisms to extract vibration energy, and achieves ultra-low frequency energy harvesting. The experimental results demonstrate that the device can effectively collect vibration energy generated from various human motions.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Anastasiia A. Gerasimenko, Can Peng, Hao Lu, Vadim O. Korchagin, Xiwen Zhang, Haitao Li, Zigang Deng
Summary: This article presents a method to improve the design of electromagnetic turnouts for high-temperature superconducting Maglev systems. By placing a diamagnetic screen between the electromagnetic poles, the scattering fluxes between them can be reduced. Experimental results support the effectiveness of this method.
Article
Acoustics
Yucheng Yan, Qichang Zhang, Jianxin Han, Wei Wang, Tian Wang, Xinyu Cao, Shuying Hao
Summary: This paper designs and investigates a quad-stable piezoelectric vibration energy harvester induced by the geometric nonlinearity of springs. The system effectively protects against electromagnetic interference by replacing permanent magnets with a combination of springs. The innovative design of three hinged springs attached to the cantilever beam enables the structure to have inherently nonlinear stiffness and induce multi-stability.
JOURNAL OF SOUND AND VIBRATION
(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
Thermodynamics
Shuyu Fan, Yongkui Tang, Lurui Zhao, Hai Liu, Yufeng Wang, Dibo Hou, Yunqi Cao
Summary: This paper presents the design of a nonresonant broadband electromagnetic vibration energy harvester (EMVEH) based on a magnet array and microfabricated planar coils. A geometric optimization method is proposed to enhance the power output and power density. The optimized design shows improved performance in terms of power output and half-power bandwidth.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Materials Science, Multidisciplinary
Sri Vikram Palagummi, Fuh-Gwo Yuan
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2017)
Article
Dentistry, Oral Surgery & Medicine
Xiaohong Wang, George Huyang, Sri Vikram Palagummi, Xiaohui Liu, Drago Skrtic, Carlos Beauchamp, Rafael Bowen, Jirun Sun
Article
Instruments & Instrumentation
Sri Vikram Palagummi, Forrest A. Landis, Martin Y. M. Chiang
REVIEW OF SCIENTIFIC INSTRUMENTS
(2018)
Article
Engineering, Electrical & Electronic
S. Palagummi, F. G. Yuan
SENSORS AND ACTUATORS A-PHYSICAL
(2018)
Article
Instruments & Instrumentation
X. Y. Wang, S. Palagummi, L. Liu, F. G. Yuan
SMART MATERIALS AND STRUCTURES
(2013)
Article
Dentistry, Oral Surgery & Medicine
Sri Vikram Palagummi, Taeseung Hong, Zhengzhi Wang, Chang Kwon Moon, Martin Y. M. Chiang
Article
Dentistry, Oral Surgery & Medicine
Sri Vikram Palagummi, Taeseung Hong, Li Jiang, Martin Y. M. Chiang
Summary: The pulse-delay photocuring technique can reduce polymerization stress without sacrificing monomer conversion, with a minimum radiant exposure required for this reduction. This technique has the potential for successful clinical application in dental restorative composites.
Meeting Abstract
Chemistry, Multidisciplinary
Forrest Landis, Sri Palagummi, Martin Chiang
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2016)
Article
Acoustics
S. Palagummi, J. Zou, F. G. Yuan
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2015)
Proceedings Paper
Engineering, Electrical & Electronic
S. Palagummi, J. Zou, F. G. Yuan
ACTIVE AND PASSIVE SMART STRUCTURES AND INTEGRATED SYSTEMS 2015
(2015)
Proceedings Paper
Energy & Fuels
S. Palagummi, F. G. Yuan
ACTIVE AND PASSIVE SMART STRUCTURES AND INTEGRATED SYSTEMS 2013
(2013)
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)