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    Advanced ocean wave energy harvesting: current progress and future trends

    2023-03-02 02:34:42FangHEYibeiLIUJiapengPANXinghongYEPengchengJIAO
    關(guān)鍵詞:產(chǎn)活仔數(shù)長白豬白豬

    Fang HE, Yibei LIU, Jiapeng PAN, Xinghong YE, Pengcheng JIAO

    Review

    Advanced ocean wave energy harvesting: current progress and future trends

    Fang HE, Yibei LIU, Jiapeng PAN, Xinghong YE, Pengcheng JIAO

    Ocean College, Zhejiang University, Zhoushan 316021, China

    With a transition towards clean and low-carbon renewable energy, against the backdrop of the fossil-energy crisis and rising pollution, ocean energy has been proposed as a significant possibility for mitigating climate change and energy shortages for its characteristics of clean, renewable, and abundant. The rapid development of energy harvesting technology has led to extensive applications of ocean wave energy, which, however, has faced certain challenges due to the low-frequency and unstable nature of ocean waves. This paper overviews the debut and development of ocean wave energy harvesting technology, and discusses the potential and application paradigm for energy harvesting in the “intelligent ocean.” We first describe for readers the mechanisms and applications of traditional wave energy converters, and then discuss current challenges in energy harvesting performance connected to the characteristics of ocean waves. Next, we summarize the progress in wave energy harvesting with a focus on advanced technologies (e.g., data-driven design and optimization) and multifunctional energy materials (e.g., triboelectric metamaterials), and finally propose recommendations for future development.

    Ocean wave energy; Wave energy converters; Energy harvesting technology; Advanced energy materials; Intelligent ocean

    1 Introduction

    Nearly 40% of global population and 70% of industrial capital are located within 100 km of marine coastlines (UN, 2017). Because of proximity to these sites with high energy demand, ocean energy is recognized as a significant potential means of mitigating climate change and energy shortages. It is clean, renewable, and abundant (IRENA, 2020). Among the major ocean energy resources, wave energy has the outstanding merits of high density and wide distribution, which opens up the possibility of generating electrical power in most marine environments with a small converter unit volume (Khanet al., 2017). Wave energy suitable for harvesting is predominantly from wind-generated waves, whose average annual power flux ranges from 10 kW/m to 100 kW/m (Mei, 2012). Wind-generated waves are dominated by gravity and inertial forces. Thus, they can propagate a long way with low energy decay and continuous wind drive, meaning that wave energy is a stable renewable energy source (Folley, 2017). The global wave energy capacity is theoretically 29500 TWh per year, which would be sufficient to meet the entire global energy demand (M?rket al., 2010). Wave energy distribution is generally consistent with that of wind energy, which is powerful in the latitudes of 30°???60° and weak near the equator and poles (Gunn and Stock-Williams, 2012).

    Although the French granted the first wave energy converter (WEC) patent as early as 1799, wave energy harvesting did not receive much attention until the first oil crisis. Salter (1974) published a paper titled "Wave Power" in the prestigious journal, immediately generating enthusiasm in the academic community. The first large-scale WEC, called Kaimei (Miyazaki and Masuda, 1980), the integration of WEC into breakwaters in Sakata (Godaet al., 1991) and Trivandrum (Ravindran and Koola, 1991), and the overtopping WEC prototype TAPCHAN (Mehlum, 1986), all emerged in this period. Since entering the 21st century, the coastal countries have continued to actively deploy policies and funding for wave energy harvesting to fuel further development. The European Marine Energy Center in Orkney, Scotland, is now the most authoritative international testing and certification institution for marine energy installations (EMEC, 2020). The USA released the United States Marine Hydrokinetic Renewable Energy Technology Roadmap in 2010, and launched the construction of a national wave energy testing facility named PacWave in 2016 (DOE, 2016). Australia is also a maritime power with massive potential for wave energy harvesting, where the MK1, MK2, and MK3 developed by Oceanlinx have been connected to the grid successfully (Falc?o and Henriques, 2016). China has achieved some important technologies, such as a wave energy aquaculture cage called Penghu and a 500 kW WEC called Zhoushan. Portugal, Japan, India, and Ireland are also at the frontier of wave energy harvesting (IEA-OES, 2021).

    Wave energy is a high-grade energy source that contains both kinetic and potential energy, allowing almost any transmission mechanism to be feasible for wave energy conversion. Consequently, thousands of WECs have been invented (Kofoed, 2017), but few have seen successful commercialization. The current progress of wave energy harvesting faces certain challenges, mainly due to the trade-off dilemma between technology and cost. First, WECs are designed to resonate in order to maximize energy conversion; this leads to large motions that cause critical reliability and survivability issues. Next, ocean wave frequencies are generally low, so the matching natural frequency of a WEC should also be low; the relatively large equipment sizes required for this are expensive. In addition, waves are random and unstable, while WECs are designed for specific sea conditions; therefore, the large variations in waves cause critical efficiency issues. These challenges make the design considerations for WECs different from those for traditional o?shore engineering structures. Many studies have been done on WECs to reduce costs and enhance performance, which is vital for promoting commercialization. Besides large-scale power production, specialized applications of wave energy harvesting are another option for achieving economic viability. On the one hand, WECs could be deployed at small islands, marine buoys, offshore construction sites, and other locations where traditional energy is expensive, unavailable, or inaccessible (Fadaeenejadet al., 2014; McLeod and Ringwood, 2022). On the other hand, they could be integrated into breakwaters, offshore wind farms, and fish culture, where multiple functions could share the cost and space (Heet al., 2019; Nguyenet al., 2020).

    There have been many review papers covering various aspects of wave energy harvesting, including its mechanisms and classification (Drewet al., 2009; Falc?o, 2010; Lópezet al., 2013), power-take-off (PTO) system and control strategies (WangLG et al., 2018; Ahamedet al., 2020), modeling methods (Li and Yu, 2012; Penalbaet al., 2017; Windtet al., 2018), reliability and survivability (Clark and DuPont, 2018; Coeet al., 2018), integration with offshore infrastructures (Pérez-Collazoet al., 2015; Mustapaet al., 2017; Clementeet al., 2021), mooring system (Davidson and Ringwood, 2017; Qiaoet al., 2020), economic analysis (Astariz and Iglesias, 2015; Bhuiyanet al., 2022), and status of particular country/continent (Clémentet al., 2002; Lehmannet al., 2017; Qiuet al., 2019). It must be acknowledged that traditional wave energy harvesting is not yet fully mature and needs a breakthrough that would enable it to handle the essential characteristics of sea conditions. In this regard, some advanced technologies have emerged in recent years. Triboelectric nanogenerators (TENGs) are a typical example that has significant advantages for collecting low-frequency energy, strengthening its practicality for wave energy harvesting (Wanget al., 2017; Zhang QY et al., 2021). Wang et al. (2015) reported a spherical TENG and Xu et al. (2019) designed a tower-like TENG with high power density for direction-independent energy acquisition. Artificial intelligence (AI)?-based performance-oriented optimization has been used to realize the ideal theory-based control. With the development of metamaterials and AI techniques, many novel mechanisms and research methods have been applied to improve wave energy harvesting performance. Means of achieving high-efficiency wave energy harvesting include phase control or resonance formation. For example, Zouet al. (2022) found that deep reinforcement learning (DRL) control outperformed model-based control in the power production of direct-drive WEC systems. This review aims to inform readers about the mechanisms and applications of traditional WECs, existing challenges due to the nature of ocean waves, current progress in wave energy harvesting with a focus on advanced technologies and energy materials, and recommendations for future development.

    2 Mechanisms of ocean waves and traditional applications

    2.1 Mechanisms and characteristics of ocean waves

    Although monochromatic waves have been commonly accepted for WEC performance testing, ocean waves are random and irregular. Generally, irregular wave theories are employed to reproduce real sea conditions, as follows:

    where the foot markerpresents theth partial wave,athe wave amplitude,kthe wavenumber,ωthe angular frequency,the distance,the time, andεthe initial phase angle ranging in [0, 2π]. Wave characteristics vary significantly by season and region, making wave energy assessments increasingly important (Arinaga and Cheung, 2012). These assessments mainly depend on ocean buoy and satellite altimeter data in the early stages, and advanced wave models in the later stages. Rapidly developed wave models make it possible to accomplish local refinement assessments, even in marine areas without observation information (Gunn and Stock-Williams, 2012), which contribute considerably to pre-site selection of nearshore wave energy harvesting.

    2.2 Applications of ocean waves in energy harvesting

    As mentioned above, thousands of WECs have been invented so far. The working principles, operation modes, structural features, and deployment locations of WECs are remarkably diverse. Aside from a few exceptions, the conversion process in a WEC generally consists of three stages, and performance depends heavily on ocean wave conditions. Here, we will follow the classification method of Falc?o (2010), which is widely accepted by the academic community. Most WECs can be categorized into three types: oscillating water column, oscillating body, and overtopping system. For three categories, wave energy is converted into pneumatic, kinetic, and potential energy, respectively, in the first conversion stage; accordingly, the PTO mechanism is mainly air turbine, hydraulic motor, and low head hydraulic turbine in the second conversion stage. As illustrated in Fig. 1, each category can be further divided into floating and fixed, and some WECs listed have undergone pilot or prototype testing.

    Fig. 1 Classification of WECs. Reprinted from (Falc?o, 2010), Copyright 2010, with permission from Elsevier

    2.2.1 Oscillating water column WECs

    The oscillating water column (OWC) WEC was the earliest one developed, dating as far back as 1940. As illustrated in Fig. 2, a typical OWC WEC consists of a hollow pneumatic chamber with a large opening below water level. Air is trapped inside the hollow chamber above the internal water column to act as the conversion medium. Incoming waves cause the internal water column to oscillate and convert wave energy into pneumatic energy of trapped air. Then the oscillating pressure of the trapped air can drive an air turbine at the chamber top as the PTO and convert pneumatic energy into mechanical energy for electricity production (Heet al., 2012, 2013; Heath, 2012). The oscillating trapped air is reciprocating. If traditional one-way turbines are used, complex valve systems are needed and will cause considerable energy loss, so self-rectifying turbines are more suitable and widely employed. The Wells turbine and impulse turbine are the two most commonly used self-rectifying turbines for OWC WEC (Falc?o and Henriques, 2016).

    Fig. 2 Schematic diagram of OWC WEC (SWL: still water level)

    Due to their operating principle and structural simplicity, OWC WECs have the most refined design, and are suitable for both stand-alone and integrated use (He and Huang, 2014, 2016, 2017; Heet al., 2023). OWC WECs which have undergone pilot or prototype testing include the Sakata in Japan (Godaet al., 1991), the Might Whale in Japan (Ogataet al., 2002), the Pico in Portugal (Falc?oet al., 2020), the LIMPET in the UK (Alcorn and Beattie, 2001), the LeanCon in Denmark (LEANCON, 2015), the OE Buoy in Ireland (Alcornet al., 2014), the MK3 in Australia (Falc?o and Henriques, 2016), the Mutriku Plant in Spain (Torre-Encisoet al., 2009), the SparBuoy in the UK (Falc?o and Henriques, 2014), the GreenWAVE in Australia (Appleyard, 2015), the Yongsoo plant in Korea (Liuet al., 2016), the REWEC3 in Italy (Arenaet al., 2013), the Uniwave200 in Australia (WSE, 2021), and the Drakoo in China (Hann-Ocean, 2022).

    2.2.2 Oscillating body WECs

    A rigid body can move in six degrees of freedom. The oscillating body is a broad concept. As illustrated in Fig.3, the oscillating body in this WEC design can have diverse shapes and move in various degrees of freedom. Incoming waves cause the body to oscillate and convert wave energy into kinematic energy of the body. Then, the motions of the oscillating body can drive a hydraulic motor as the PTO and convert kinematic energy into mechanical energy for electricity production (Xuet al., 2022). Based on its relationship to wave direction and motion modes, the oscillating body can be subcategorized as point absorber, attenuator, and oscillating water surge converter. The motions of oscillating bodies are random and unstable, so hydraulic motors and transmission systems are generally employed to achieve continuous and stable mechanical energy (Albertet al., 2017).

    Although their long-term operability and durability are in doubt due to the movable components in the seawater, oscillating body WECs are considered some of the most economical and efficient (Li and Yu, 2012; Guoet al., 2021). Those which have undergone pilot or prototype testing include the Wavebob in Ireland (Tarrant and Meskell, 2016), the AquaBuOY in the USA (Weinsteinet al., 2004), the AWS in Portugal (Prado and Polinder, 2013), the Pelamis in the UK (EMEC, 2004), the OPT PowerBuoy in the USA (Gerber and Taylor, 2003), the Sigma in Montenegro (SIGMA-ENERGY, 2018), the bioWAVE in Australia (Zhang and Aggidis, 2018), the Wavestar in Denmark (Wave Star, 2012), the DEXA in Denmark (Zanuttighet al., 2013), the Oyster in the UK (Whittaker and Folley, 2012), the Langlee Robusto in Spain (LANGLEE, 2013), the ISWEC in Italy (ENI, 2022), the CETO6 in Australia (Carnegie, 2017), the WaveRoller in Portugal (AW-ENERGY, 2022), the WM9.1 in Cyprus (SWEL, 2022), the Eco Wave in Gibraltar (EWP, 2016), the C4 in Sweden (CorPower Ocean, 2018), and the Eagle- Zhoushan in China (IEA-OES, 2021).

    Fig. 3 Schematic diagram of oscillating body

    2.2.3 Overtopping system WECs

    The overtopping system is unique in various WECs and the principle is more similar to that behind hydroelectric power. As illustrated in Fig. 4, a typical overtopping system WEC consists of a reservoir with a sloping access. Incoming waves climb up the sloping access into the reservoir and convert wave energy into potential energy in the water stored in the reservoir. Then the head difference between internal and external water levels can drive a low head hydraulic turbine as the PTO and convert potential energy into mechanical energy for electricity production (Contestabileet al., 2017). The overtopping process is highly nonlinear. Occurrences of wave runup and breaking cause large energy loss, so the conversion efficiency of this design is low. However, overtopping system WECs can convert the random and unstable energy of waves into stable potential energy in the reservoir (Pérez-Collazoet al., 2015), and can use the mature axial flow turbines of hydroelectric power stations.

    Fig. 4 Schematic diagram of overtopping system WEC

    Overtopping system WECs have high requirements for reservoir capacity and deployment topography, so there are relatively few of them in operation. Models which have undergone pilot or prototype testing include the TAPCHAN in Norway (Mehlum, 1986), the Wave Dragon in Denmark (Tedd and Kofoed, 2009), and the SSG in Norway (Margheritiniet al., 2009).

    2.3 Performance and comparison

    To date, none of the existing WECs has achieved economic viability. There is no predominant WEC design like the three-bladed horizontal-axis turbine in the wind energy sector. The wave energy sector is still making great efforts towards more efficient technologies and economic applications (Aderinto and Li, 2018). There is a wide variety of WEC concepts, with highly individual manufacturing, transportation installation, and operation costs. Due to the lack of data, it is hard to quantitatively compare different WEC concepts within the same framework at this time, and only a relatively general assessment can be obtained. In terms of efficiency, Babarit (2015) set up a database of capture width ratio (CWR) for WECs and performed a statistical analysis on the mean CWR for each type of WEC, as shown in Table 1. In order to carry out a comprehensive evaluation of performance, the scarce and precious data from some WECs that have undergone sea trials were collected by Xieet al. (2017) and Zhang YXet al. (2021). The latter group proposed a multi-index evaluation model including aspects of energy capture, technology-cost economics, reliability, environmental friendliness and adaptability. Their evaluation indicated that the oscillating body WEC offered the most benefits, owing to its efficiency and environmental friendliness. The major drawback of the OWC WEC, on the other hand, is clearly the weak performance of the air turbines.

    Table 1 Mean CWR and main issues for each type of WEC

    However, the economic feasibility of a WEC depends more on the local wave energy resources in most cases, and thus, local adaptation is essential to design. By way of example, 25 kW/m is the representative wave energy flux along the coasts of Europe and the USA, while it may be much smaller in China (Mustapaet al., 2017). Amrutha and Sanil Kumar (2022) investigated the performance of a few WECs in the wave conditions of the Indian shelf seas, and recommended a kind of pontoon (oscillating body) WEC. Castro-Santoset al. (2020) found that the Wave Dragon (overtopping system) WEC offered good value in the wave conditions of the north of Spain. Xieet al. (2017) preferred a point absorber or duck-type (oscillating body) WEC for areas with low wave energy flux, like China. Focusing on the areas with the world's highest wave power, Rusu and Onea (2017) made a performance assessment of ten WECs based on their technical specifications. In addition to local adaptation, control strategy plays a significant role in the performance optimization of WECs in random and unstable wave conditions (Ringwood et al., 2014; Li et al., 2021). Damping control, reactive control, latching/unlatching, and model predictive control are the most common control strategies; they can be used to adjust the dynamic response of WECs and greatly improve energy harvesting performance of WECs (Maria-Arenas et al., 2019).

    Many studies have been done on the oscillating water column, oscillating buoy, and overtopping system. A comprehensive evaluation of the performance of various existing WECs has become critical. It will help significantly in converging on a predominant model for WECs and focus further in-depth research.

    3 Current progress in ocean wave energy harvesting

    3.1 Exploration and application paradigms of advanced energy materials

    To this end, the typical application paradigms of AI in advanced energy materials can be categorized into data collection and representation, algorithm determination, and model development (Zhou et al., 2019; Barnett et al., 2020; Das et al., 2020), as shown in Fig. 5. In order to collect and represent data, AI algorithms are trained by the existing data on ocean wave energy harvesting. It is therefore necessary to maintain the quality and quantity of the data pool. For example, ocean waves typically consist of tens of thousands of low frequency cyclic fluctuations, which usually create 30% waste data (i.?e., data noise) in the pool (Jiao, 2021). Thus, initial data preprocessing is important in exploring energy materials by AI (Gibert et al., 2016; Epps et al., 2021). Identifying and correcting errors is critical to reducing the possibility of misleading AI models. During algorithm determination, the raw data are preprocessed due to the huge amount of data collected in ocean wave energy harvesting strongly influencing the accuracy and efficiency of AI models. Given its high error-tolerance when handling noisy and incomplete data, AI is able to establish nonlinear relationships between inputs and outputs, and therefore, determine the dominant parameters of energy materials, in order to obtain advanced energy materials with high energy harvesting efficiency for ocean wave environment (Kalidindi et al., 2016; Gomes et al., 2019). During model development, AI is able to unveil the featurization between the input and output variables and develop a suitable model to guide the discovery of energy materials; and, more importantly, improve their applications in ocean wave energy harvesting. In general, the more suitably the raw data are represented and the more effectively the AI algorithms are determined, the more accurately and efficiently advanced energy materials can be explored (Sahu et al., 2018; Jiao and Alavi, 2021).

    Fig. 5 Application paradigms of AI in advanced energy materials:(a) data collection and representation; (b) algorithm determination; (c) model development. OWEH: ocean wave energy harvesting

    3.2 Data-driven design and optimization of energy devices

    Due to the structural complexity of energy devices, data-driven tools have been extensively used in their structural design and optimization. The frequency and amplitude of ocean waves make it necessary to take advantage of structure to trigger energy materials for high efficiency energy harvesting, as shown in Fig. 6a. For example, starting with arbitrary population of initial designs, evolutionary computation compares and optimizes the designs with respect to the predefined fitness evaluation function of ocean wave energy harvesting performance, and the designs with the best energy performance have the best chance to be the design parents for the next generation (Sirigu et al., 2020; Yang et al., 2022). Next, the selected designs are arbitrarily transformed into new designs based on crossover, recombination, or mutation operations. Eventually, the fittest design with the best energy harvesting response is determined from millions of possible designs generated during the evolutionary process.

    Fig. 6 Data-driven design and optimization of energy devices:(a) structural design to assist in efficiently triggering energy materials in response to ocean waves; (b) illustration of AI-enabled inverse design of energy devices in ocean wave energy harvesting

    While existing data-driven design and optimization studies have primarily focused on determining the best structural designs with respect to the evaluation function of ocean wave energy harvesting performance, the entire concept of AI for performance-oriented inverse design of novel energy devices is still in its infancy (Tang et al., 2020). One of the most vital issues in optimizing the energy harvesting performance of these devices is finding a way to establish appropriate predictor variables; and the next step toward AI-enabled inverse design of energy devices is to obtain optimal structures by directly considering the required energy harvesting performance response, as shown in Fig. 6b. In this strategy, a set of design constraints can be passed to a topology-optimization algorithm to generate the initial energy device geometries, and AI then explores a suite of new designs that outperform the initial patterns used for its training. As a consequence, AI-based structural design and optimization significantly enhance the experiential nature of design prototyping (Salehi and Burgue?o, 2018; Wu et al., 2021).

    3.3 Data-driven integrated ocean wave energy harvesting systems

    Integrated ocean wave energy harvesting systems driven by advanced data technology have four layers: environment, software, hardware, and application, as shown in Fig. 7. The environment layer refers to external ocean wave conditions that can be used to trigger the energy harvesting system. Although data-driven technique cannot control these ambient conditions, it can design and optimize the materials and structures in the energy devices to assist in tailoring the entire energy harvesting system, which is important as ocean waves are typically low frequency and low amplitude. To trigger the energy materials under certain external excitations (e.?g., ocean waves) and effectively generate electrical power, AI can be used to analyze the environment characteristics of ocean waves in this layer (Candella, 2019; Lou et al., 2021). Second, the software layer performs data preprocessing and AI model development. The raw energy harvesting data for certain energy materials and structures under ocean waves must first be processed through signal preprocessing, mining, and/or amplifying to improve data quantity and quality. AI models can then be developed after data analysis and interpretation to predict the generated electrical voltage (Mellit and Kalogirou, 2008; Hossain et al., 2017). The third layer, hardware, consists of designing and optimizing the structure of the energy harvesting devices under ocean waves. Due to the technological issues in energy harvesting from ocean waves, it is generally necessary to optimize energy devices for low frequency and low amplitude ocean wave excitations. In addition, it is necessary to protect the hardware package from the harsh ocean environment (Akyildiz et al., 2005; Calvente, 2018). Finally, the application layer refers to power storage, management, and real-time charging. One must store the generated electrical power for energy shortagein situ. Ocean equipment is typically designed with multifunctional devices (e.g., for monitoring, wireless communication, and computation), which requires in situ energy shortage management of these devices and functionalization of real-time charging (Shi et al., 2019; Caoet al., 2021).

    Fig. 7 Data-driven integrated ocean wave energy harvesting systems:(a) environmental, software, hardware, and application layers; (b) extended functions in energy platforms and networks. Freq: frequency; amp: amplitude; envrn: environment; mater: material; struct opt: structural optimization

    Note that integrated ocean wave energy harvesting systems are commonly designed with multiple components over a relatively large application zone, which critically relies on data communication through wireless technologies such as wireless gateways, the internet-of-things (IoT), or the intelligent cloud (Shaikh and Zeadally, 2016; Sanislavet al., 2018). Furthermore, there is significant power dependence because energy harvesting systems are connected with human-computer interaction or with certain terminal software such as user interfaces (UIs), user portals, or customized cloud interfaces. In general, novel functionalities of integrated ocean wave energy harvesting systems require electronic devices, which results in more severe energy shortage.

    4 Future trends of ocean wave energy harvesting in the intelligent ocean

    Ocean engineering, especially large-scale equipment and construction, relies heavily on electrical power. Therefore, it consumes large amounts of electricity and also provides the most application scenarios for energy harvesting technologies (Zuo and Tang, 2013; Wang Y et al., 2020). Reliable green energy is viewed as a key issue that critically affects sustainable development of the entire domain of ocean engineering. To address this energy shortage, energy harvesting has opened a promising venue for next-generation electrical power. Ocean waves are seen as an excellent source of electricity energy, which has led to extensive research and practical directions for ocean wave energy harvesting. However, as explained above, ocean waves have certain limitations that cause technological challenges for energy harvesting, i.e., low frequency and low amplitude fluctuation (Safaei et al., 2019; Wang et al., 2021). Energy harvesting efficiency is inadequate under typical conditions. Data-driven material exploration and structural design are powerful tools to address the challenges of ocean waves, and therefore, we believe that enhancement of ocean wave excitation will be a future trend in ocean wave energy harvesting. AI has attracted significant research attention in ocean wave energy harvesting in recent years, mainly due to the inadequacy of physics-based models developed using first principles (Dong et al., 2020; Jiang et al., 2021). In physics, modeling of materials through what is known as first principles has become a major research area. The approach involves putting in place only certain basic physical constants to obtain the fundamental properties of a system, rather than using experimental parameters. However, the nature of first principles results in potential oversimplification or assumptions, as otherwise the entire system is likely to be too complex to model or solve. Compared to traditional modeling approaches that typically use physical principles to design energy devices for use in ocean waves, AI has the capability to comprehend and handle high dimensional feature spaces (Wang T et al., 2020). According to the objectives and applications, AI in ocean wave energy harvesting can be categorized into the fields of technology (i.e., AI model design and optimization) and utility (i.e., AI-enabled energy harvesting performance) (Khorsand et al., 2020; Liu L et al., 2021). The former is mainly achieved using machine learning (ML) algorithms (Kibriaet al., 2018; Guo et al., 2021), and the latter includes the functionalities of reasoning, programming, artificial life, evolutionary computation, and constraint satisfaction (Erden et al., 2008; Gottlob and Szeider, 2008; Lu et al., 2018; Zhan et al., 2022). The application paradigms of AI ocean wave energy harvesting can be divided into three steps. The first is identifying the key indicators that dominate the performance of the energy device; the second is processing the energy harvesting data and establishing the AI model accordingly; and the final step is conducting performance-oriented inverse design to determine the structural and material properties of the energy device.

    "Intelligent ocean" refers to not only internet-based information technologies, but also green energy solutions that are customized, portable, efficient, and sustainable, such as ocean wave energy harvesting (Ahmadi et al., 2019; Zhang Q et al., 2021). Wave energy is a critical energy source in the intelligent ocean, and has been used to power various marine devices and equipment for both ocean engineering and ocean technology (Rui et al., 2020; Zhao et al., 2021). From an ocean engineering perspective, ocean structural health monitoring (O-SHM) systems are joint applications of various advanced sensors, control systems, and communication technologies in the intelligent ocean. They require reliable power to remotely charge these sensors and monitor control platforms, while continuously analyzing the generated big data (Zhang et al., 2017; Xi et al., 2019). Efficiently charging the sensors for the specific working environment (e.g., type and amplitude of mechanical energy) ensures precise monitoring of the real-time working conditions of ocean engineering structures (Wang XF et al., 2015; Wang LG et al., 2018; Zhang YXet al., 2021; Li et al., 2022). From an ocean technology perspective, ocean wave energy is one of the main power sources for maintaining the functionality of various marine equipment and devices, such as deep sea mining equipment, wind energy equipment, and ocean exploration devices. Wireless communication systems play an important role in maintaining connection and communication in the intelligent ocean, and they need highly reliable power supplies to maintain the processing of massive data (Liserre et al., 2010; López et al., 2013; Li et al., 2019). Ocean wave energy harvesting can be used to generate electrical power for the relatively high energy consumption needed for wireless communication. Fig. 8 illustrates the potential applications of ocean wave energy in ocean engineering and technology for the intelligent ocean. The traditional immobile, centralized energy supply systems have become incompatible with the current requirements of customized remote equipment and devices (Bandodkar et al., 2016; Guk et al., 2019). As a consequence, ocean wave energy is anticipated to serve as an important and powerful component in the intelligent ocean. Potential applications are envisioned in the ocean engineering domain, such as road detection (e.g., roads, bridges, and facilities), smart supervision systems (e.g., self-diagnosing wireless local area network (WLAN), smart surveillance closed-circuit television (CCTV), and smart traffic signal systems), and all-in-one portable devices for real-time feedback on working conditions. Potential applications have also been proposed in the ocean technology domain, for example self-powered unmanned aerial vehicles (UAVs) (Khoshnoudet al., 2020), autonomous underwater vehicles (AUVs) (Townsend, 2016), mining equipment (Jasiuleket al., 2016), wind energy equipment (Panet al., 2019), and ocean exploration equipment (Valdezet al., 2011).

    5 Conclusions

    Ocean wave energy has attractive potential for generating electrical power from the marine environment, and this potential has been exploited by different energy harvesting devices in recent years. However, traditional wave energy converters face certain challenges due to their intrinsic characteristics as well as the low frequency and unstable nature of ocean waves, leading to a trade-off dilemma between technology and cost. This review article provides readers with an overview of the mechanisms and applications of traditional wave energy converters, the existing challenges in energy harvesting performance, and current progress on next-generation ocean wave energy harvesting driven by the advanced energy materials and technologies. We first covered the mechanisms of traditional wave energy converters: the oscillating water column, oscillating body, and overtopping system; and described cases, whether fixed or floating, that have undergone pilot or prototype testing. Next, we summarized the research direction of AI-based exploration and the potential applications of advanced multifunctional materials and structures in ocean wave energy harvesting. The description of various applications of AI concluded with material discovery, structural optimization, and performance-oriented inverse design. Integrated ocean wave energy harvesting systems enabled by advanced energy materials and structures involve four development stages: environment, software, hardware, and application. Eventually, we envision future development trends that involve applying ocean wave energy harvesting in the intelligent ocean from perspectives of ocean engineering and ocean technology. Intelligent ocean engineering relies heavily on joint application of various advanced sensors, control systems, and communication technologies in ocean structural health monitoring systems. Ocean wave energy harvesting can efficiently charge sensors for the specific working environment, allowing precise monitoring of real-time working conditions of structures. Intelligent ocean technologyis dependent on power sources to maintain the functionality of various marine equipment and devices, and ocean wave energy harvesting could be a powerful alternative to generate electrical power.

    1.1 數(shù)據(jù)與來源 收集云南省某豬場2015年1月至2016年6月長白豬、大白豬、長大二元豬3個類型豬第一至第三胎的妊娠期、產(chǎn)仔數(shù)、產(chǎn)活仔數(shù)、產(chǎn)健仔數(shù)及初生窩重等數(shù)據(jù),共232頭豬,其中大白豬64頭,長白豬73頭,長大二元豬95頭。

    Fig. 8 Vision for ocean wave energy harvesting in the intelligent ocean

    This work is supported by the National Natural Science Foundation of China (Nos. 52022092, 51979247, and 52211530092), the Talent Program of Zhejiang Province (No. 2021R52050), the Key Research and Development Plan of Zhejiang Province, China (Nos. 2021C03181 and 2023C03122), and the Key-Area Research and Development Program of Guangdong Province (No. 2021B0707030002), China. Pengcheng JIAO acknowledges the Startup Fund of the Hundred Talent Program at Zhejiang University, China.

    Fang HE: conceptualization, methodology, writing-review & editing, resources, supervision, and funding acquisition. Yibei LIU: formal analysis, investigation, and writing-original draft. Jiapeng PAN: writing-original draft and visualization. Xinghong YE: writing-original draft and visualization. Pengcheng JIAO: conceptualization, methodology, writing-review & editing, supervision, and funding acquisition.

    Fang HE, Yibei LIU, Jiapeng PAN, Xinghong YE, and Pengcheng JIAO declare that they have no conflict of interest.

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    Pengcheng JIAO, pjiao@zju.edu.cn

    Pengcheng JIAO, https://orcid.org/0000-0002-9577-3828

    Dec. 12, 2022;

    Revision accepted Jan. 16, 2023;

    Crosschecked Feb. 2, 2023

    ? Zhejiang University Press 2023

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