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Recent advancement of flow-induced piezoelectric vibration energy harvesting techniques:principles,structures,and nonlinear designs

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 959-978页

作者： Dongxing CAO Junru WANG Xiangying GUO s.k.lai Yongjun sHEN Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Beijing key Laboratory of Nonlinear Vibrations and strength of Mechanical structures Beijing 100124China school of Automation Beijing Information Science and Technology UniversityBeiing 100192China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina Hong kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center The Hong Kong Polytechnic UniversityKowloonHong KongChina state key Laboratory of Mechanical Behavior and system safety of Traffic Engineering structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Energy harvesting induced from flowing fluids(e.g.,air and water flows)is a well-known process,which can be regarded as a sustainable and renewable energy *** addition to traditional high-efficiency devices(e.g.,turbines and watermills),the micro-power extracting technologies based on the flow-induced vibration(FIV)effect have sparked great concerns by virtue of their prospective applications as a self-power source for the microelectronic devices in recent *** article aims to conduct a comprehensive review for the FIV working principle and their potential applications for energy ***,various classifications of the FIV effect for energy harvesting are briefly introduced,such as vortex-induced vibration(VIV),galloping,flutter,and wake-induced vibration(WIV).Next,the development of FIV energy harvesting techniques is reviewed to discuss the research works in the past three *** application of hybrid FIV energy harvesting techniques that can enhance the harvesting performance is also ***,the nonlinear designs of FIV-based energy harvesters are reported in this study,e.g.,multi-stability and limit-cycle oscillation(LCO)***,advanced FIV-based energy harvesting studies for fluid engineering applications are briefly ***,conclusions and future outlook are summarized.

关键词： vibration-driven energy harvesting flow-induced vibration(FIV) piezoelectric approach nonlinear design

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On the role of friction of triboelectric effect on nonlinear tri-hybrid vibration-based energy harvesting

On the role of friction of triboelectric effect on nonlinear...

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第十九届全国非线性振动暨第十六届全国非线性动力学和运动稳定性学术会议（NVND2023）

作者： J.M.Wang s.k.lai Department of Civil and Environmental Engineering The Hong Kong Polytechnic University

Advances in low-power integrated circuits, wireless communication and mobile electronic technology in recent decades have led to a greatly increasing requirement for vibration energy harvesting technology. Piezoelectric and electromagnetic energy harvesters are the two most common types and have been studied extensively.. Triboelectric energy harvesting, as a relatively new energy harvesting technique, has attracted much attention due to its simple fabrication, light weight, cost-effectiveness, and a wide variety of potential applications. This work presents a new sliding-mode tribe-electromagnetic-piezoelectric energy harvester in the form of a cantilever beam with a tip mass that is acted upon by both magnetic and friction forces. This is the first study of the impact of the sliding-mode hybrid energy harvesting approach from an experimental aspect. A comparison of the open circuit of piezoelectric and electromagnet energy harvest units between with and without triboelectric impact suggests that the friction force cannot be ignored, which makes the without-friction impact model preferable in the dynamical analysis. Additionally, a magnetic field that induces tri-stability is present. Hybrid harvest modes can greatly improve output efficiency compared to a single energy collection method with a cantilever system. Implementing the strategy of tri-stable nonlinear behavior, shallower potential wells of the dynamical system can be achieved by adjusting the interaction between the outer fixed magnets and the beam tip magnet. It is found that the distribution of the tri-stability changes when friction is involved, and the output of tri-stability shrink at low acceleration. The experiment results show that the system displays the highest output intra-well oscillation under 5 Hz. Compared to the open circuit voltage output under the excitation with 3-5 Hz, friction has less influence at 6-7 Hz. Meanwhile, with the fiction effect, the single coil harvest unit, one side pie

关键词： low-frequency excitation friction effect hybrid energy harvesting magnetic multistability

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Computational Fluid Dynamics study of a Cardiovascular Disease:Thoracic Aortic Dissection

Computational Fluid Dynamics Study of a Cardiovascular Disea...

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The 16th Annual Conference of Hong kong society of Theoretical and Applied Mechanics 2012、The 1st Mainland-Hong kong Youth Forum on Mechanics 2012、The 8th shanghai-Hong kong Forum on Mechanics and Its Application 2012

作者： Y.s.Tang s.k.lai stephen W.k.Cheng k.W.Chow Department of Mechanical Engineering the University of Hong Kong Department of surgery the University of Hong Kong

An aortic dissection occurs when blood intrudes into the layers of the vascular wall, creating an artificial *** is a severe pathological situation,since the weakened vessel wall may expand and be subject to the risk of rupture and massive internal bleeding,resulting in high *** is believed that biomechanical factors would play a role in this disease condition. Endovascular repair has now become a frequently employed practice in the clinical treatment and management.A stent graft is deployed to cover the tears and restrict the flow from entering the artificial *** this study,computational fluid dynamics analysis is performed to study the hemodynamics of a dissected aorta(Fig.1).simplified aortic geometries with realistic dimensions are *** velocity and pressure waveforms are prescribed at the inlet and outlet respectively. Blood flow configuration and biomechanical forces are ***-operation and post-operation conditions are also *** quantitative analysis can provide valuable information for clinicians to making therapeutic decision.

关键词： Computational Fluid Dynamics study of a Cardiovascular Disease:Thoracic Aortic Dissection

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简约之美——新款雷诺风景音响改装

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汽车杂志 2005年第11期 204-205页

作者： s.k.lai 徐雨

也许你现在并未察觉，实际上，汽车音响已经成为我们很多人生活的一部分。在茫茫人海中，在漫漫人生中，无数个日夜，从早到晚，我们辛勤的工作，我们平凡的生活，当然，我们也有执着的追求。我们这帮人，因为汽车音乐相识相知相交，因... 详细信息

也许你现在并未察觉，实际上，汽车音响已经成为我们很多人生活的一部分。在茫茫人海中，在漫漫人生中，无数个日夜，从早到晚，我们辛勤的工作，我们平凡的生活，当然，我们也有执着的追求。我们这帮人，因为汽车音乐相识相知相交，因为汽车音乐欣喜畅快淡定。

关键词：音响改装风景雷诺简约汽车音响生活音乐

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A Computational Fluid Dynamics study on the Endovascular Treatment of Intracranial Aneurysms

A Computational Fluid Dynamics Study on the Endovascular Tre...

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作者： s.k.lai Abraham Y.s.Tang k.M.Leung Gilberto k.k.Leung k.W.Chow Department of Mechanical Engineering University of Hong Kong Division of Neurosurgery Department of SurgeryLi Ka Shing Faculty of MedicineUniversity of Hong KongQueen Mary Hospital

Intracranial aneurysm,a localized dilation of arterial blood vessels in the brain,is a severe cerebrovascular *** appropriate medical treatment,the rupture of intracranial aneurysms will result in high mortality rate due to excessive bleeding into the cavity surrounding the *** modern technological advances,endovascular stenting technique has now proven to be one effective technique in the clinical management of intracranial *** prime advantage of endovascular intervention over traditional open surgery is that the former procedure is less invasive,and thus a shorter recovery time will *** a mechanical point of view,a metallic stent,serving as a flow diverter,can be deployed to cover the entire aneurysm *** the blood flow inside the aneurysmal sac becomes stagnant,and thrombus formation is likely to *** is expected that a larger extent of thrombosis is capable of reducing the risk of growth and rupture of *** assess this clinical objective quantitatively,we construct a three-dimensional(3D) aneurysm model (see Fig.1) to investigate the blood flow patterns in stented and non-stented *** many idealized models with straight or curved parent blood vessel,the aneurysm of the current model is placed at the bifurcation point of cerebral arteries,a geometric configuration occurring frequently for many *** fluid dynamics techniques are applied to perform the blood flow *** inlet and outlet boundary conditions of this model are subjected to pulsatile velocity and pressure waveforms *** on the present study,the impact of hemodynamic and biomechanical factors on the aneurysm can be *** quantitative findings can also provide valuable information for clinical practitioners to understand and predict the hemodynamic behaviour in patient-specific cases.

关键词： A Computational Fluid Dynamics study on the Endovascular Treatment of Intracranial Aneurysms

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Exploring the synergy of the eyebrain connection:neuromodulation approaches for neurodegenerative disorders through transcorneal electrical stimulation

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Neural Regeneration Research 2024年第10期19卷 2097-2098页

作者： Antara Verma stephen k.Agadagba Leanne lai-Hang Chan Department of Electrical Engineering City University of Hong KongKowloonHong Kong Special Administrative RegionChina Centre for Eye and Vision Research Ltd. Hong Kong Special Administrative RegionChina Pennsylvania state University University ParkPAUSA

The connection and interaction between the eye and the brain are crucial to understanding brain disorders(Marchesi et al.,2021).Both the eye and the brain have a limited regenerative capacity as there are few progenitor cells,and nerve cells do not ***,neurodegeneration implicates irreversible damage to the central nervous system,as observed in several neurodegenerative diseases(Marchesi et al.,2021).

关键词： stimulation degenerative

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Power Flow Analytical solutions and Multi-dimensional Voltage stability Boundaries Based on Multivariate Quotient-difference Method

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CsEE Journal of Power and Energy systems 2024年第3期10卷 1168-1178页

作者： Chengxi Liu Qiupin lai school of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network Wuhan 430072China IEEE

This paper proposes a novel Multivariate Quotient-Difference(MQD)method to obtain the approximate analytical solution for AC power flow ***,in the online environment,the power flow solutions covering different operating conditions can be directly obtained by plugging values into multiple symbolic variables,such that the power injections and consumptions of selected buses or areas can be independently *** method first derives a power flow solution through a Multivariate Power series(MPs).Next,the MQD method is applied to transform the obtained MPs to a Multivariate Pad´e Approximants(MPA)to expand the Radius of Convergence(ROC),so that the accuracy of the derived analytical solution can be significantly *** addition,the hypersurface of the voltage stability boundary can be identified by an analytical formula obtained from the coefficients of *** direct method for power flow solutions and voltage stability boundaries is fast for many online applications,since such analytical solutions can be derived offline and evaluated online by only plugging values into the symbolic variables according to the actual operating *** proposed method is validated in detail on New England 39-bus and IEEE 118-bus systems with independent load variations in multi-regions.

关键词： Analytical power flow solution multivariate power series multivariate Padéapproximants multivariate quotient-difference multi-dimensional voltage stability boundary

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Preface to the special Issue:Additive Manufacturing—Expanding Production Horizon

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Acta Metallurgica sinica(English Letters) 2024年第1期37卷 1-2页

作者： lai-Chang Zhang Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing(AM),commonly known as 3D printing,has become a transformative technology that has a profound impact on various industrial *** encompasses a set of techniques for building objects layer by layer from digital *** conventional subtractive manufacturing methods that involve removing material from large blocks,AM adds material incrementally,providing unprecedented design flexibility and efficiency.

关键词： removing printing Expanding

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Remote sensing image encryption algorithm utilizing 2D Logistic memristive hyperchaotic map and sHA-512

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science China(Technological sciences) 2024年第5期67卷 1553-1566页

作者： lai Qiang LIU Yuan YANG Liang school of Electrical and Automation Engineering East China Jiaotong UniversityNanchang330013China

The two-dimensional Logistic memristive hyperchaotic map(2D-LMHM)and the secure hash sHA-512 are the foundations of the unique remote sensing image encryption algorithm(Rs-IEA)suggested in this *** proposed map is formed from the improved Logistic map and the memristor,which has wide phase space and hyperchaotic range and is exceptionally excellent to be utilized in specific *** proposed image algorithm uses the permutation-assignment-diffusion *** generates two position matrices in a progressive manner to achieve an efficient random exchange of pixel positions,assignment is carried through on the image pixels of the permutated image to entirely remove the original image information,strengthening the relationship between permutation and diffusion,and loop diffusion in two different directions can use subtle changes of pixels to affect the whole *** random key and plain-image sHA-512 hash values are used to produce an additional key,which is then utilized to figure out the permutation parameters and the initial value of a chaotic *** experimental results with the average NPCR=99.6094%(NPCR:number of pixels change rate),average UACI=33.4638%(UACI:unified average changing intensity),100%pass rate of the targets in the test set,the average correlation coefficient is 0.00075,and the local information entropy is 7.9025,which shows that the algorithm is able to defend against a variety of illegal attacks and provide more trustworthy protection than some of the existing state-of-the-art algorithms.

关键词： chaos memristive hyperchaotic map remote sensing sHA-512 image encryption Rs-IEA

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supercoiled DNA Minicircles under Double-strand Breaks

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Chinese Journal of Polymer science 2024年第9期42卷 1353-1359,I0007页

作者： Ye-Peng Qiao Chun-lai Ren National Laboratory of solid state Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China

Understanding how supercoiled DNA releases intramolecular stress is essential for its functional ***,the molecular mechanism underlying the relaxation process remains insufficiently *** we employed MD simulations based on the oxDNA2 model to investigate the relaxation process of a 336-base pair supercoiled minicircular DNA under double-strand breaks with two fixed *** simulations show that the conformational changes in the DNA occur continuously,with intramolecular stress release happening abruptly only when the DNA chain traverses the breakage *** relaxation process is influenced not only by the separation distance between the fixed ends but also their ***,we observe an inhibitory effect on the relaxation characterized by small angles,where short terminal loops impede DNA conformational adjustments,preserving the supercoiled *** findings elucidate the intricate interplay between DNA conformational change,DNA motion and intramolecular stress release,shedding light on the mechanisms governing the relaxation of supercoiled DNA at the molecular level.

关键词： supercoiled DNA DNA minicircle DNA relaxation oxDNA model MD simulation

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