A5048806330- Innovative Energy Harvesting Technologies
- Energy Harvesting in Wireless Networks
- Vibration Control and Rheological Fluids
- Wireless Power Transfer Systems
- Advanced Sensor and Energy Harvesting Materials
- Magnetic Bearings and Levitation Dynamics
- Seismic Performance and Analysis
- Electric Motor Design and Analysis
- Fluid Dynamics and Vibration Analysis
- Vibration and Dynamic Analysis
- Structural Health Monitoring Techniques
- Structural Engineering and Vibration Analysis
- Geomagnetism and Paleomagnetism Studies
Tianjin University
2020-2025
Korea Institute of Science and Technology
2024
Abstract The magnetically induced multi-stable piezoelectric vibration energy harvesters have garnered significant attention due to their strong nonlinear characteristics, wide operating bandwidths, and high electromechanical conversion efficiency. However, a traditional penta-stable design typically requires four rectangular external magnets. excessive number of structural parameters amplify complexities in system optimization, dynamic analysis, prototype installation, impeding harvester...
A novel Nonlinear Eddy Current Damping (NL-ECD) design method for a Triple-magnet Magnetic Suspension Dynamic Vibration Absorber (TMSDVA) is proposed, modelled, and tested. The implementation of the NL-ECD completely passive does not require an external energy supply. First, mathematical model TMSDVA vibration reduction system established. Additionally, calculation also derived. coefficient can be designed adjusted by changing dimensional parameters damping tube. Then correctness derivation...
Purpose An appropriate equivalent model is the key to effective analysis of system and structure in which permanent magnet takes part. At present, there are several models for calculating interacting magnetic force between magnets including magnetizing current, charge dipole–dipole model. How choose most efficient still needs further discussion. Design/methodology/approach This paper chooses cuboid, cylindrical spherical as objects investigate detailed calculation procedures based on three...
<sec>Multi-stable structures are deformable that can have large deformations under external excitation. Generally, multi-stable at least two stable points and jump from one to another. Because excellent nonlinear characteristics, they widely used in many fields. In the field of energy harvesting, often obtained by means cantilever beams. This is because beam simple make, low stiffness, high sensitivity, undergo small excitation forces. Besides, simply sticking magnets on its free end...
Abstract This paper presents a mechanical-free method for providing and tailoring the nonlinear force in bistable piezoelectric energy harvesters (BPEHs). The can be tailored to obtain lower threshold inter-well motions, or harvester operate at various excitation levels frequencies without changing mechanical structure overall assembly. In BPEHs, is match specific level frequency, designed achieve higher strain (and thus output power). design of nonlinearity separated from by using magnetic...
Nonlinear multi-stable piezoelectric energy harvesters show broadband frequency spectra and excellent harvesting performance, owing to their high output power related inter-well transitions. However, existing quad-stable contain too many structural parameters, which makes the systems clumsy, increases difficulties of dynamic analysis optimization. Herein, a nonlinear harvester, with only one external magnet, is proposed based on magnetic force characteristics between ring magnet rectangular...
This article proposed an equivalent model to calculate the magnetic field of a special multipole magnet. The magnet is formed when two permanent magnets large dimension differences are forced into contact with same polarity, after removal small magnet, becomes In process, interacting force between changes from repulsive attractive as approach. Moreover, reversed pole occupies area roughly magnets. Qualitatively, possesses lower load line than which suggests that prone irreversible...
Nonlinear energy sinks (NESs) have received considerable attention in vibration suppression, and the optimal design around stiffness damping is considered key to achieving improved performance. This paper investigates tri-magnet monostable bistable enhanced NESs with electromagnetic harvesting mechanism. A comprehensive evaluation of absorption efficiency NES conducted. The structure developed further realize both configurations. Then, an series coils conversion element based on mechanism...
To achieve broadband energy harvesting under weak excitations, this paper comprehensively investigates a novel tri-magnet levitating bistable electromagnetic harvester with variable potential wells (BEEH-VP). The nonlinear mechanism is realized using the single-sided bipolarity of ring magnets. Auxiliary springs are integrated into magnets to dynamically self-adjust spacing magnets, causing wells. analytical model BEEH-VP derived and verified experimentally. performance proposed compared...
A novel Triple-magnet Magnetic Suspension Dynamic Vibration Absorber is designed and modeled in this paper. The equivalent dynamic model of the vibration reduction system established. Meanwhile, calculation nonlinear magnetic suspension force derived. Based on model, it found that stiffness feature can be adjusted by changing magnet distance Absorber. Then equations are solved using Complex Variable Average method. And correctness derivation procedure verified through Runge–Kutta From...
A novel Triple-magnet Magnetic Dynamic Vibration Absorber (TMDVA) with Eddy Current Damping (ECD) and Coulomb damping is proposed in this paper. multi-storey structure selected as the vibration reduction object. First, equivalent dynamics model of TMDVA system established. Then nonlinear magnetic force built according to magnetizing current theory. Next, an ECD accurate calculation developed derived based on Faraday’s law electromagnetic induction. Because model, coefficient can be designed...
The nonlinear restoring force plays a significant role in broadening the frequency range of piezoelectric energy har-vester (PEH). This paper presents novel approach to tailoring using locally demagnetized permanent mag-net (LDPM). adjustment can be achieved by altering pattern (LD) regions. We utilized cylindrical magnet with rectangular LD patterns as LDPM. magnetic field LDPM is studied both theoretically and experimentally. Then, dynamic behavior proposed PEH numerically. influence...
Purpose The existing Nonlinear Dynamic Vibration Absorbers (NLDVAs) have the disadvantages of complex structure, high cost, installation space requirements and difficulty in miniaturization. And most NLDVAs not been applied to reality. To address above issues, a novel Triple-magnet Magnetic Absorber (TMDVA) with tunable stiffness, only composed triple cylindrical permanent magnets an acrylic tube, is designed, modeled tested this paper. Design/methodology/approach (1) A TMDVA designed. (2)...
This paper presents a theoretical method to estimate the average output power of bi-stable energy harvester (BEH) operating in its chaotic regime. Based on fact that there exist dense periodic sets embedded attractor, and time averages orbits tend probability measure, we find BEH motion can be estimated by unstable (UPOs) with low period. A modified harmonic balance is proposed obtain self-symmetric, cross-well period-3 UPOs based symmetry governing equations, orbit averaging UPOs. Numerical...