Smart Materials and Structures最新文献_第9页

Piezoelectric adaptive active vibration suppression for wind-tunnel model support sting 用于风洞模型支撑刺的压电自适应主动振动抑制装置

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-10 DOI: 10.1088/1361-665x/ad5e4f

Weiguang Li, Zhichun Yang, Ximing Zhu and Ke Liu

{"title":"Piezoelectric adaptive active vibration suppression for wind-tunnel model support sting","authors":"Weiguang Li, Zhichun Yang, Ximing Zhu and Ke Liu","doi":"10.1088/1361-665x/ad5e4f","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5e4f","url":null,"abstract":"Due to flow separation and turbulence, the slender cantilever aircraft model support system is prone to low-frequency and large-amplitude resonance in the wind tunnel tests, resulting in a decrease in test data quality, a limited test envelope, and even threatening the safe operation of the wind tunnel. A piezoelectric active damping system based on the filtered-x least mean square algorithm is proposed to effectively suppress the vibration of the wind-tunnel model support sting. Firstly, a modified variable step least mean square algorithm is proposed to address the issue that the fixed-step algorithms limit each other in terms of convergence speed and steady-state error. Following that, a variable step filtered-x least mean square algorithm based on reference signal reconstruction is developed, and the corresponding feedback controller is designed to perform the ground tests of the piezoelectric active damping system for the wind-tunnel model support sting. The experimental results show that the proposed algorithm has a faster convergence speed and lower steady-state error than the traditional algorithms, as well as strong anti-noise and adaptive control abilities that significantly improve the active vibration suppression effect of the wind-tunnel model support sting.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"21 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141586364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Online meta-learning approach for sensor fault diagnosis using limited data 利用有限数据进行传感器故障诊断的在线元学习方法

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-09 DOI: 10.1088/1361-665x/ad5caf

Lei Wang, Dukang Huang, Ke Huang, Marco Civera

{"title":"Online meta-learning approach for sensor fault diagnosis using limited data","authors":"Lei Wang, Dukang Huang, Ke Huang, Marco Civera","doi":"10.1088/1361-665x/ad5caf","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5caf","url":null,"abstract":"The accurate and timely diagnosis of sensor faults plays a critical role in ensuring the reliability and performance of structural health monitoring (SHM) systems. However, the challenge is detecting, locating, and estimating sensor faults in an online manner using limited training data. To resolve this problem, a novel approach for online sensor fault diagnosis is proposed for SHM. The proposed approach is based on meta-learning, which enables superior model generalization capabilities using limited data. The detection, localization, and estimation of typical sensor faults in an online manner can be achieved efficiently by the proposed approach. First, a one-dimensional convolutional neural network (1D CNN) is designed to detect and locate faulty sensors. The initial model parameters of the 1D CNN are optimized using a model-agnostic meta-learning training strategy. This strategy allows the acquisition of transferable prior knowledge, which can speed up the learning process on new sensor fault detection and localization tasks. The meta-learning strategy also enables efficient and accurate detection and localization of potential faulty sensors with limited data. After detecting and locating the faulty sensors, an online updating algorithm based on a dual Kalman filter is used to estimate the severity of sensor faults and structural states simultaneously. The proposed approach is demonstrated with simulated sensor faults that cover a numerical example and field measurements from the Canton Tower. The results show that the proposed approach is applicable for online sensor fault diagnosis in SHM.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"40 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141571266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetically-responsive microwall arrays with path-guide for directional transportation of droplets 磁响应微球阵列与用于液滴定向输送的路径导向器

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-09 DOI: 10.1088/1361-665x/ad5bcd

Soyeon Kwon, Jihun Kim, Yoobin Do, Hyeokbae Kwon, Soungmin Kwon and Hyun-Taek Lee

引用次数: 0

A spray-cooling based antagonistic SMA actuator (SCASA) with low resistance consumption and high driving frequency 基于喷雾冷却技术的低电阻消耗、高驱动频率的拮抗式 SMA 执行器（SCASA）

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-09 DOI: 10.1088/1361-665x/ad5b31

Lei Zhang, Hu Jin, Yiming Ouyang, Wenlong Cheng, Weihua Li and Shiwu Zhang

{"title":"A spray-cooling based antagonistic SMA actuator (SCASA) with low resistance consumption and high driving frequency","authors":"Lei Zhang, Hu Jin, Yiming Ouyang, Wenlong Cheng, Weihua Li and Shiwu Zhang","doi":"10.1088/1361-665x/ad5b31","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5b31","url":null,"abstract":"Owing to the large strain output and high power-to-weight ratio, using temperature-induced shape memory alloy (SMA) springs in the form of antagonistic actuators offers the opportunity to develop simple, lightweight, and multi-mode robotic systems. Currently, the capabilities and deep application of these robotic systems are hindered by the relatively large resistance consumption and limited driving frequency of the antagonistic SMA actuators, primarily attributed to the cooling rate of SMA. In this paper, a spray-cooling based antagonistic SMA actuator (SCASA) was proposed, aiming to address the existing challenges in antagonistic SMA actuators. Theoretical modeling of the SCASA was comprehensively investigated. Experimental findings highlight the superior cooling efficacy of the spray-cooling method, attaining a cooling rate surpassing 100 °C per second for a single SMA spring. Using the spray-cooling based method, the driving frequency of a single SMA spring is approximately twice that of the forced-air cooling method. Experimental results also demonstrate the superior performance of the SCASA using the spray-cooling method, resulting in a reduction of approximately 50% in resistance consumption and an increase of approximately 40% in driving frequency compared to the forced-air method. This work elucidates the promising application prospects of the spray-cooling method in SMA actuators.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"15 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141571264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spray pyrolysis synthesis of Sr2Si5N8:Eu2+ nanoparticles for light conversion film enhancing photosynthesis in greenhouses 喷雾热解合成 Sr2Si5N8:Eu2+ 纳米粒子，用于增强温室光合作用的光转换薄膜

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-08 DOI: 10.1088/1361-665x/ad5920

Yan Wang, Lina Zhou, Lichun Cheng

{"title":"Spray pyrolysis synthesis of Sr2Si5N8:Eu2+ nanoparticles for light conversion film enhancing photosynthesis in greenhouses","authors":"Yan Wang, Lina Zhou, Lichun Cheng","doi":"10.1088/1361-665x/ad5920","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5920","url":null,"abstract":"This study presents a comparative analysis of Sr2Si5N8:Eu2+ nanoparticles synthesized using Spray Pyrolysis (SP) and Solid-State Synthesis (SSS). Through meticulous characterization, we found that the SP method significantly enhanced the morphological and optical properties of the nanoparticles. SP-produced nanoparticles demonstrated a 30% higher crystallinity and a 25% increase in luminescence intensity compared to their SSS counterparts. Additionally, the mesoporous structure characteristic of SP-synthesized particles exhibited a 15% greater surface area, measured at 124.7 m2 g−1, which contributed to improved light absorption capabilities. These attributes are crucial for the intended application of enhancing photosynthesis in greenhouse environments. The UV–Visible spectra confirmed that SP nanoparticles possess superior light conversion capabilities, with notable implications for optimizing light distribution to facilitate plant growth. This research highlighted the advantages of SP, including ease of scalability and enhanced optical performance, which are pivotal for agricultural applications. The study emphasized that the choice of synthesis method played a critical role in tailoring the properties of Sr2Si5N8:Eu2+ nanoparticles for specific functional requirements in optical and agricultural technologies.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"28 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141571267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A piezoelectric pump with composite chamber: using bluff body to improve its anti-clogging ability 带复合腔体的压电泵：利用崖体提高抗堵塞能力

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-03 DOI: 10.1088/1361-665x/ad5cb0

Song Chen, Xuan Fang, Yilei Xie, Zijian Huang, Weijun Zhan, Junwu Kan, Zhonghua Zhang and Jianping Li

{"title":"A piezoelectric pump with composite chamber: using bluff body to improve its anti-clogging ability","authors":"Song Chen, Xuan Fang, Yilei Xie, Zijian Huang, Weijun Zhan, Junwu Kan, Zhonghua Zhang and Jianping Li","doi":"10.1088/1361-665x/ad5cb0","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5cb0","url":null,"abstract":"Piezoelectric pumps are widely used in biomedicine, chip cooling, fuel cells and so on. However, existing valve-based piezoelectric pumps suffer from the problem of easy clogging. In order to solve the problem, a piezoelectric pump with composite chamber (PPCC) is proposed. The composite chamber, consisting of drive chamber and flow chamber, which provides the PPCC with excellent output performance by amplifying the compression ratio. Meanwhile, a bluff body is set in the drive chamber, and the vortex flow around the bluff body is able to adsorb air bubbles and other impurities, preventing impurities from entering the drive chamber, the bluff body provides the PPCC with strong anti-clogging ability. Multi-physics field simulation is established, which verifies the PPCC is feasible. The fluid inside the pump chamber is simulated, and it is concluded that the 90-arc bluff body is optimal, favoring the formation of high-speed vortices. Furthermore, a prototype is fabricated and experimentally investigated. The experimental results show that the PPCC has excellent performance in pumping liquid and gas. At 300Vpp, the PPCC delivered a maximum flow rate of 235.9 ml min−1 for air and 24.07 ml min−1 for water. The anti-clogging ability of PPCC is verified through bubble resistance experiments, which demonstrates the composite chamber and bluff body effectively prevent foreign impurities from entering the drive chamber. The PPCC provides a new approach to microfluidic pumping devices.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"52 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141553188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Addressing data scarcity using audio signal augmentation and deep learning for bolt looseness prediction 利用音频信号增强和深度学习进行螺栓松动预测，解决数据稀缺问题

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-03 DOI: 10.1088/1361-665x/ad5c24

Nikesh Chelimilla, Viswanath Chinthapenta and Srikanth Korla

{"title":"Addressing data scarcity using audio signal augmentation and deep learning for bolt looseness prediction","authors":"Nikesh Chelimilla, Viswanath Chinthapenta and Srikanth Korla","doi":"10.1088/1361-665x/ad5c24","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5c24","url":null,"abstract":"Deep learning models such as convolutional neural networks (CNNs) encounter challenges, including instability and overfitting, while predicting bolt looseness in data-scarce scenarios. In this study, we proposed a novel audio signal augmentation approach to classify bolt looseness in the event of data deficiency using CNN models. Audio signals at varied bolt torque conditions were extracted using the percussion method. Audio signal augmentation was performed using signal shifting and scaling strategies after segmenting the extracted audio signals. The unaugmented and augmented audio signals were transformed into scalograms using the continuous wavelet transform approach to train the CNN models. Upon training with augmented datasets, a promising improvement in the loss and accuracy of the CNN models in recognizing bolt looseness was noticed. One of the significant observations from the current study is that the implementation of audio signal augmentation improved the extrinsic generalization ability of the CNN models to classify bolt looseness. A maximum increase of 73.5% to identify bolt looseness in novel data was exhibited as compared to without augmentation. Overall, a maximum accuracy of 94.5% to classify bolt looseness in unseen data was demonstrated upon audio signal augmentation. In summary, the results affirm that the audio signal augmentation approach empowered the CNN models to predict bolt looseness in data-deficient scenarios accurately.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"33 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical metastructure with embedded phononic crystal for flexural wave attenuation 带有嵌入式声子晶体的机械结构，用于挠曲波衰减

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-03 DOI: 10.1088/1361-665x/ad5c23

Long Liu, Ji Wan Kim, Gil Ho Yoon and Bing Yi

{"title":"Mechanical metastructure with embedded phononic crystal for flexural wave attenuation","authors":"Long Liu, Ji Wan Kim, Gil Ho Yoon and Bing Yi","doi":"10.1088/1361-665x/ad5c23","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5c23","url":null,"abstract":"Destructive interference-based metamaterials have shown excellent characteristics in elastic wave manipulation and vibration attenuation. Nevertheless, challenges persist in the application due to limited space and lightweight design, as current metastructures require additional beam structure. To simplify the design of metamaterials for flexural wave manipulation, this paper presents a new class of embedded phononic crystal for manipulating flexural wave propagation in both one and two-dimensional space by taking advantage of destructive interference, which can effectively suppress the mechanical vibration of a beam structure with a broad band gap. The flexural wave dispersion characteristic in a non-uniform beam structure is derived based on the Euler–Bernoulli beam theory, and an embedded phononic structure with the mechanism of destructive interference is presented to demonstrate its effectiveness in mitigating mechanical vibration. Subsequently, four typical units of embedded phononic structures are designed for attenuating flexural wave propagation in a beam structure. Finally, both numerical simulations, including one and two-dimensional phononic crystals, and physical experiments are implemented to evaluate the performance of the presented metastructure for flexural wave manipulation, which indicates that the proposed embedded phononic structures can effectively mitigate structural vibration in the low-frequency domain. To the best of our knowledge, it is the first attempt to design the metabeam with embedded phononic structures by taking advantage of destructive interference.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"39 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel dragonfly wing shape auxetic tubular structure with negative Poisson’s ratio 具有负泊松比的新型蜻蜓翼形辅助管状结构

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-02 DOI: 10.1088/1361-665x/ad59e4

Rafael Augusto Gomes, Lucas Antonio de Oliveira, Matheus Brendon Francisco and Guilherme Ferreira Gomes

{"title":"A novel dragonfly wing shape auxetic tubular structure with negative Poisson’s ratio","authors":"Rafael Augusto Gomes, Lucas Antonio de Oliveira, Matheus Brendon Francisco and Guilherme Ferreira Gomes","doi":"10.1088/1361-665x/ad59e4","DOIUrl":"https://doi.org/10.1088/1361-665x/ad59e4","url":null,"abstract":"Mechanical structures abilities to absorb and dissipate energy have a variety of applications in daily life, including the ability to dampen mechanical vibrations and shock effects. In the present study, inspired by the dragonfly wing (DFW) shape, a novel auxetic unit cell was developed with the goal of proposing a novel structure with a lower stress concentrator and consequently increasing energy absorption. The negative Poisson’s ratio behavior was also studied. The DFW shaped unit cells were applied in a tubular structure, and the experimental samples were produced utilizing an additive manufacturing process with polylactic acid filament. To validate the ability to absorb energy of the novel unit cell, a comparison was proposed with the classical reentrant auxetic tubular structure following two different parameters: weight and the number of unit cells being developed in two different DFW structures. The study of the novel unit cell was performed using finite element analysis and experimental testing, and excellent agreement was observed between them. As a result, the bio-inspired DFWs shape in both configurations proposed when compared to the classical reentrant presented an excellent result in terms of absorbing energy, where the structure with the same quantity of unit cells and the structure with the same weight respectively absorb 163% and 79% when compared to the classical Reentrant, finally the new structure presented the negative Poisson’s ratio of −0.5, presenting an auxetic behavior and being able to resist more force and displacement","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"47 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast stiffness variation gripper with efficient adhesion control 刚度变化快的机械手，附着力控制效率高

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-01 DOI: 10.1088/1361-665x/ad5a59

Wenqing Chen, Tianhui Sun, Jingyang Li, Xiaosong Li, Lvzhou Li, Yonggang Meng and Yu Tian

{"title":"Fast stiffness variation gripper with efficient adhesion control","authors":"Wenqing Chen, Tianhui Sun, Jingyang Li, Xiaosong Li, Lvzhou Li, Yonggang Meng and Yu Tian","doi":"10.1088/1361-665x/ad5a59","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5a59","url":null,"abstract":"The mushroom-shape gecko-inspired adhesive has been extensively studied and applied in a wide range of fields. However, current research primarily focuses on enhancing its adhesion properties, necessitating further exploration in strategies of detachment and adaptation, which significantly constrain its practical applications. In this study, a stiffness variable gripper with controllable adhesion and fast response is developed by integrating mushroom-shape adhesive with granular jamming technology. A theoretical model for the detachment of the gripper is established, indicating the effect of backing stiffness on adhesion performance, which is verified through contact area observations and adhesion experiments. The proposed modulation method demonstrates an impressive adhesion-to-detachment ratio of 92.8, with adhesion capacity of up to 41.023 N and detachment force of only 0.442 N. The switch time is remarkably fast at just 0.5 s. Additionally, the designed gripper, under pressure difference of 60 kPa, is able to stably grasp smooth objects with various shapes weighing over 2 kg, with a load-to-weight ratio of approximately 8, and a minimal power consumption of only 4.404 W. The work here presents a comprehensive understanding of adhesion modulation of fibrillar adhesive through granular jamming, and provides new insights into robust reversible adhesion design for related technologies.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"164 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0