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Neele, Maurits (author)High-precision mechatronic equipment often benefits from or even needs vibration isolation to function within specification. Examples of such equipment include metrology devices, space instrumentation and lithography assemblies. Vibration isolation is often the function of the mounting between the equipment and the floor or rest of the machine....master thesis 2024
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Mula, S. (author)Metal–organic frameworks (MOFs) are a class of hybrid materials with metal-based inorganic nodes connected by organic linkers via strong coordination bonds. These building blocks can be arranged in 3-D crystalline lattices to synthesize structures with varying pore sizes and a variety of structures (tuneability). These hybrid materials possess...doctoral thesis 2024
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Wemelsfelder, Tom (author)In recent years, many therapeutic applications for medical ultrasound have arisen, such as ablation of tumors, breaking up kidney stones, and neuromodulation. To localize the target area, often ultrasound imaging methods are used. Conventionally, a different transducer array is used for imaging and therapeutic applications because of their...master thesis 2024
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Baaij, Thomas (author)This thesis report contains two papers. The first paper is a literature study on mechanisms, smart actuated materials and controllable joints. In this paper, several smart materials are identified and it is discussed how they can be embedded in different mechanisms. From this paper, it is concluded that fast-response smart material twisting...master thesis 2024
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Sekar, S.A. (author), Hunt, A. (author)Additive manufacturing of sensors and actuators together with structural materials and electronics will make it possible to fabricate innovative system designs that are overly laborious to realise with conventional methods. While printing of the structural materials and electronics are advancing fast, the additive manufacturing methods for...journal article 2024
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Wang, Ningzhen (author), Baferani, Mohamadreza Arab (author), Daniels, Robert (author), Wu, Chao (author), Huo, Jindong (author), van Turnhout, J. (author), Sotzing, Gregory A. (author), Gerhard, Reimund (author), Cao, Yang (author)Multi-layer ferroelectrets consisting of fluoroethylenepropylene (FEP) copolymer and open-porous expanded polytetrafluoroethylene (ePTFE) films exhibit stable internal electret charges, high piezoelectric coefficients and heat resistance, making them promising candidates for wearable sensors or nanogenerators in body-area networks. Here,...journal article 2024
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Yue, X. (author), Mo, J. (author), Chen, Zhiyuan (author), Vollebregt, S. (author), Zhang, Kouchi (author), Du, S. (author)Synchronized rectifiers offer promising solutions for piezoelectric energy harvesting; however, achieving the promised energy extraction performance necessitates using either a bulky inductor or multiple large capacitors, which cannot be on-chip integrated and increase the system form factor. This article introduces a fully integrated...journal article 2024
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Ghaderiaram, A. (author), Mohammadi, R. (author), Schlangen, E. (author), Fotouhi, M. (author)Engineering structures, such as bridges, wind turbines, airplanes, ships, buildings, and offshore platforms, often experience uncertain dynamic loadings due to environmental factors and operational conditions. The lack of knowledge about the load spectrum for these structures poses challenges in terms of design and can lead to either over...journal article 2024
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Lu, T. (author), Wang, Ruizhi (author), Tang, Z. (author), Zou, Yiwei (author), Yue, X. (author), Liang, Yansong (author), Gong, Haoran (author), Liu, Shurui (author), Chen, Zhiyuan (author), Liu, Xun (author), Du, S. (author)This article presents a 10mV-startup-voltage thermoelectric energy harvesting system, assisted by a piezoelectric generator (PEG) as a cold starter. It exploits the fact that when a thermoelectric energy harvesting system is implemented in a place where kinetic energy is also present, the PEG starter can provide a clock signal to start the...journal article 2024
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Galiana, Shankar (author), Moradi, M. (author), Wierach, Peter (author), Zarouchas, D. (author)Acousto-ultrasonic composite transducers (AUCTs), comprising piezoceramic materials in a reinforced polymeric matrix, show promise for structural health monitoring in composite structures. Challenges arise when integrating AUCTs onto highly loaded thermoplastic composites, especially low-surface-energy materials like polyaryletherketone...journal article 2024
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Alimohammadi, Hossein (author), Vassiljeva, Kristina (author), Hassan HosseinNia, S. (author), Petlenkov, Eduard (author)This article explores internally coupled resonators in metamaterial systems, focusing on mechanical and electromechanical coupling. The article provides a thorough examination of stability within the context of internally coupled resonators. It establishes stability criteria, emphasizing the importance of strictly stable systems in practical...journal article 2024
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Wang, Ningzhen (author), Zhang, He (author), Qiu, Xunlin (author), Gerhard, Reimund (author), van Turnhout, J. (author), Cressotti, Jason (author), Zhao, Dong (author), Tang, Liang (author), Cao, Yang (author)The growing demand for wearable devices has sparked a significant interest in ferroelectret films. They possess flexibility and exceptional piezoelectric properties due to strong macroscopic dipoles formed by charges trapped at the interface of their internal cavities. This review of ferroelectrets focuses on the latest progress in...review 2024
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Alimohammadi, H. (author), Vassiljeva, K. (author), Hassan HosseinNia, S. (author), Petlenkov, E. (author)This paper proposes an effective approach to en-hance bandgap depth in metastructures with high damping ratios, utilizing piezoelectric actuators coupled with notch filters for improved vibration isolation. The active control strategy focuses on dynamically attenuating specific resonant frequencies through the application of notch filters...conference paper 2024
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Alimohammadi, Hossein (author), Vassiljeva, Kristina (author), Hassan HosseinNia, S. (author), Petlenkov, Eduard (author)This study delves into the nonlinear dynamics of metamaterials, exploring the dual objective of enhancing power output and achieving vibration suppression through piezoelectric energy harvesters (PEHs). Our approach is structured into a sequence of increasingly complex models that bridge mechanical resonators with their electromechanical...journal article 2024
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de Almeida, B.V. (author), Pavanello, Renato (author), Langelaar, Matthijs (author)The design of smart structures is challenging because of the integrated electromechanical modelling and optimization of actuators, sensors and load-bearing structures. To simplify the design process, it is common to decouple some of the components and physics and develop each part separately, which could lead to suboptimal systems. To improve...journal article 2024
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Yue, X. (author), Javvaji, L.S. (author), Tang, Z. (author), Makinwa, K.A.A. (author), Du, S. (author)Bias-flip rectifiers are commonly employed for piezoelectric energy harvesting (PEH). This article proposes a synchronized switch harvesting on an inductor (SSHI) rectifier with a duty-cycle-based (DCB) maximum power point tracking (MPPT) algorithm. The proposed DCB MPPT algorithm is based on the mathematically derived relation between the...journal article 2024
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- Nieuwenhuis, Jelte (author) master thesis 2023
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Kazmi, Syed Baqir Ali (author)This dissertation endeavors to introduce a novel supervised Structural Health Monitoring (SHM) methodology for the detection of damage and the prediction of fatigue life in asphalt concrete materials. Grounded in the principles of S-N (strain-number of cycles until failure) curves, this research addresses the intricate task of proficiently...master thesis 2023
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