A point absorber wave energy converter with nonlinear hardening spring power-take-off systems in regular waves

Zheng, Zhongqiang; Yao, Zhipeng; Chang, Zongyu; Yao, Tao; Liu, Bo

doi:10.1177/1475090220913687

Cited by 6 publications

(7 citation statements)

References 21 publications

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“…In contrast to the concrete nonlinear mechanisms discussed above, some scholars have also achieved nonlinear stiffness using a theoretical mathematical model. Zheng et al [30] employed a nonlinear hardening spring model, and Wilson et al [72] adopted cubic stiffness for a point absorber WEC. Fig.…”

Section: And Other Nsmsmentioning

confidence: 99%

Recent advances in wave energy converters based on nonlinear stiffness mechanisms

Zhang

Zhou

et al. 2022

Appl. Math. Mech.-Engl. Ed.

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Wave energy is one of the most abundant renewable clean energy sources, and has been widely studied because of its advantages of continuity and low seasonal variation. However, its low capture efficiency and narrow capture frequency bandwidth are still technical bottlenecks that restrict the commercial application of wave energy converters (WECs). In recent years, using a nonlinear stiffness mechanism (NSM) for passive control has provided a new way to solve these technical bottlenecks. This literature review focuses on the research performed on the use of nonlinear mechanisms in wave energy device utilization, including the conceptual design of a mechanism, hydrodynamic models, dynamic characteristics, response mechanisms, and some examples of experimental verification. Finally, future research directions are discussed and recommended.

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Section: And Other Nsmsmentioning

confidence: 99%

Recent advances in wave energy converters based on nonlinear stiffness mechanisms

Zhang

Zhou

et al. 2022

Appl. Math. Mech.-Engl. Ed.

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“…After ensuring that the NES-EH achieved optimal vibration control effect, energy collection is considered. The average power captured by NES-EH can be expressed as 24 :…”

Section: Parameters Determination Of the Energy Harvestermentioning

confidence: 99%

Study on vibration energy harvesting of offshore platform by energy harvester based on nonlinear energy sink

Chang

Yao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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Under the impacts of waves and other marine environment, the jacket offshore platform has an obvious vibration and generates lots of energy. Meanwhile, the platform may suffer fatigue damage. The vibration energy harvesting of a jacket offshore platform under random waves with a nonlinear energy sink (NES) was investigated, and a NES-Energy harvester (NES-EH) was then designed by combining an electromagnetic linear generator with the NES. Moreover, the dynamic model of the NES-EH-offshore platform was built, and the electromagnetic damping and stiffness of the energy harvester were optimized by analyzing the energy capture efficiency and root mean square reduction of the platform displacement. The effects of NES nonlinear stiffness and damping, peak period and effective wave height of irregular waves on the capture power and width of the NES-EH were also analyzed. The results show that nonlinear stiffness and damping of the NES impact the energy capturing efficiency of the NES-EH; the smaller the damping and nonlinear stiffness, the higher the power captured by electromagnetic damping in the NES-EH. Compared with NES, the NES-EH system has a better effect on the vibration control of the platform and can better capture considerable vibration energy.

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“…Dang et al [15] debated the WEC performance considering the variable stiffness mechanism (VSM). Zheng et al [16] analyzed the dynamic response of the PA-WEC considering nonlinear hardening spring PTO systems with regular waves. Furthermore, the power capture of WEC can be enhanced by different control strategies taking advantage of in PTO system, such as passive loading control [17], Latching Control [18], Reactive Loading Control [19], declutching control [20], model predictive control [21], near-optimal control [22], nonlinear model predictive control [23] and so on.…”

Section: Introductionmentioning

confidence: 99%

Dynamic performance of a point absorber WEC considering nonlinear hardening spring under irregular waves

Chang¹,

Hou²,

Zheng

2023

Int. J. Mar. Ene.

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Wave energy is a kind of clean renewable energy that is huge and still need further research. Point absorber wave energy converter (PA-WEC) is widely utilized for offshore power devices. The PA-WEC utilizes the heave motion to drive linear electric generator or a hydraulic motor to generator using power take off (PTO) system. And the PTO system usually is assumed to be a linear spring and a linear damper. Because of the larger motion, the PTO system, which exhibited non-linear behavior, is considered as linear spring with the nonlinear hardening spring and a linear damper. Through the time domain method, the dynamic model of the PA-WEC is developed under irregular waves. The state space model replaced the convolution term in the frequency domain equation. The dynamic response of the PA-WEC is researched considering different environmental parameters by Runge-Kutta method. Then the power and power ratio performance of the system is obtained. Compare with the linear WEC, the results show that the nonlinear WEC can increase the power captured in irregular waves.

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A point absorber wave energy converter with nonlinear hardening spring power-take-off systems in regular waves

Cited by 6 publications

References 21 publications

Recent advances in wave energy converters based on nonlinear stiffness mechanisms

Recent advances in wave energy converters based on nonlinear stiffness mechanisms

Study on vibration energy harvesting of offshore platform by energy harvester based on nonlinear energy sink

Dynamic performance of a point absorber WEC considering nonlinear hardening spring under irregular waves

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