Woodpecker-mimic two-layer band energy harvester with a piezoelectric array for powering wrist-worn wearables

Wang, Biao; Long, Zhihe; Hong, Ying; Pan, Qiqi; Lin, Weikang; Yang, Zhengbao

doi:10.1016/j.nanoen.2021.106385

Cited by 44 publications

(13 citation statements)

References 35 publications

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“…However, woodpeckers' skull structures are both tough and extremely resilient, reducing the impact of external transmission to the brain [38]. In principle, the head of a woodpecker can be structurally divided into four major parts: skull bone, sponge bone, hyoid bone and beak, as illustrated in Figure 1a [39]. This study was inspired by the structural characteristics of the woodpecker head, and a new impact resistance layout was designed to improve the existing composite sandwich structure, as illustrated in Figure 1b.…”

Section: Bcsp Developmentmentioning

confidence: 99%

Impact Resistance of a Fiber Metal Laminate Skin Bio-Inspired Composite Sandwich Panel with a Rubber and Foam Dual Core

Zhang

Yang

et al. 2023

Materials

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This paper reports the development of a novel bio-inspired composite sandwich panel (BCSP) with fiber metal laminate (FML) face sheets and a dual core to improve the low-velocity impact behavior based on the woodpecker’s head layout as a design template. The dynamic response of BCSP under impact load is simulated and analyzed by ABAQUS/Explicit software and compared with that of the composite sandwich panel (CSP) with a single foam core. The impact behavior of BCSP affected by these parameters, i.e., a different face sheet thickness, rubber core thickness and foam core height, was also reported. The results show that BCSP has superior impact resistance compared to CSP, with a lower damage area and smaller deformation, while carrying a higher impact load. Concurrently, BCSP is not highly restricted to any particular region when dealing with stress distributions. Compared to CSP, the bottom skin maximum stress value of BCSP is significantly reduced by 2.4–6.3 times at all considered impact energy levels. It is also found that the impact efficiency index of BCSP is 4.86 times higher than that of CSP under the same impact energy, indicating that the former can resist the impact load more effectively than the latter in terms of overall performance. Furthermore, the impact resistance of the BCSP improved with the increase in face sheet thickness and rubber core thickness. Additionally, the height of the foam core has a notable effect on the energy absorption, while it does not play a significant role in impact load. From an economic viewpoint, the height of the foam core retrofitted with 20 mm is reasonable. The results acquired from the current investigation can provide certain theoretical reference to the use of the bio-inspired composite sandwich panel in the engineering protection field.

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Section: Bcsp Developmentmentioning

confidence: 99%

Impact Resistance of a Fiber Metal Laminate Skin Bio-Inspired Composite Sandwich Panel with a Rubber and Foam Dual Core

Zhang

Yang

et al. 2023

Materials

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“…Mechanical energy is considered ubiquitous ambient energy that can be converted into electric power [51]. Employing piezoelectric as a mechanical energy harvesting mechanism is an active field of research [51,62,63]. Harvesting energy from human motion and at the same time classifying such motions has also been demonstrated before [64,65,62,66] which could be employed to reduce the power consumption further.…”

Section: System Architecture and Implementationmentioning

confidence: 99%

InMyFace: Inertial and Mechanomyography-Based Sensor Fusion for Wearable Facial Activity Recognition

Bello¹,

Marin²,

Suh³

et al. 2023

Preprint

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Recognizing facial activity is a well-understood (but non-trivial) computer vision problem. However, reliable solutions require a camera with a good view of the face, which is often unavailable in wearable settings. Furthermore, in wearable applications, where systems accompany users throughout their daily activities, a permanently running camera can be problematic for privacy (and legal) reasons. This work presents an alternative solution based on the fusion of wearable inertial sensors, planar pressure sensors, and acoustic mechanomyography (muscle sounds). The sensors were placed unobtrusively in a sports cap to monitor facial muscle activities related to facial expressions. We present our integrated wearable sensor system, describe data fusion and analysis methods, and evaluate the system in an experiment with thirteen subjects from different cultural backgrounds (eight countries) and both sexes (six women and seven men). In a one-model-per-user scheme and using a late fusion approach, the system yielded an average F1 score of 85.00% for the case where all sensing modalities are combined. With a cross-user validation and a one-model-for-all-user scheme, an F1 score of 79.00% was obtained for thirteen participants (six females and seven males). Moreover, in a hybrid fusion (cross-user) approach and six classes, an average F1 score of 82.00% was obtained for eight users. The results are competitive with state-of-the-art non-camera-based solutions for a cross-user study. In addition, our unique set of participants demonstrates the inclusiveness and generalizability of the approach.

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“…When the excitation frequency was between 1 and 5 Hz, the double pendulum generated more power than the single pendulum. Wang et al 81 designed a bionic two-layer piezoelectric energy harvester for self-powered smart watches and wristbands. The inner ring of the wristband was tied to the wrist, and the outer ring was arranged with a piezoelectric array structure.…”

Section: Limb Swingmentioning

confidence: 99%

Overview of Human Kinetic Energy Harvesting and Application

Wang

Fei

et al. 2022

ACS Appl. Energy Mater.

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In the Internet of Things era, wearable electronics and sensors have become essential for health monitoring and human computer interaction. However, a continuous power supply is an urgent demand in the field of distributed sensing. Energy harvesting from daily human activities and its conversion into electricity are expected to replace traditional batteries and wearable power supplying electronic devices. This article reviews the electromagnetic, piezoelectric, and triboelectric energy harvesting technologies from human motions, including joint rotation, limb swing, force application, fold stretching, and organ motion. It also discusses and analyzes the advantages and disadvantages of various recently proposed human energy harvesters. In addition, possible applications of active sensing and wearable powered electronic devices driven by human body kinetic energy harvesting are provided. Finally, the concept of a human energy and information exchange center based on energy harvesting is proposed as a future prospect.

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Woodpecker-mimic two-layer band energy harvester with a piezoelectric array for powering wrist-worn wearables

Cited by 44 publications

References 35 publications

Impact Resistance of a Fiber Metal Laminate Skin Bio-Inspired Composite Sandwich Panel with a Rubber and Foam Dual Core

Impact Resistance of a Fiber Metal Laminate Skin Bio-Inspired Composite Sandwich Panel with a Rubber and Foam Dual Core

InMyFace: Inertial and Mechanomyography-Based Sensor Fusion for Wearable Facial Activity Recognition

Overview of Human Kinetic Energy Harvesting and Application

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