Smart Materials and Structures最新文献_第7页

Effects of liquid lubricants on the surface characteristics of 3D-printed polylactic acid 液体润滑剂对 3D 打印聚乳酸表面特性的影响

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-21 DOI: 10.1088/1361-665x/ad622a

Gang-Min Kim, Sung-Jun Lee and Chang-Lae Kim

{"title":"Effects of liquid lubricants on the surface characteristics of 3D-printed polylactic acid","authors":"Gang-Min Kim, Sung-Jun Lee and Chang-Lae Kim","doi":"10.1088/1361-665x/ad622a","DOIUrl":"https://doi.org/10.1088/1361-665x/ad622a","url":null,"abstract":"In this study, 3D-printed Polylactic acid (PLA) specimens were manufactured and polished using various lubricants to assess their surface, friction, and wear characteristics. After polishing, the surface roughness decreased by approximately 80% compared with that before polishing, except when acetone was used as the lubricant. In particular, under deionized (DI) water and acetone lubrication conditions, the friction coefficient decreased by 63% and 70%, respectively, whereas the specific wear rate decreased by 88% and 83%, respectively, compared with the unpolished specimens. In the case of dry polishing, adhesion, friction, and wear increase owing to surface damage. Ethanol and IPA polishing resulted in hydrolysis and increased friction, but slightly decreased wear rates. The surface of the specimen polished with acetone dissolved and became very rough. Only the surface polished with DI water exhibited hydrophobic properties. When acetone and DI water were used as lubricants, the surface adhesion force, adhesion energy, friction coefficient, and wear rate were lowest. The finite element analysis results showed that the polished surface exhibited stable contact pressure and friction force, while the unpolished surface showed large fluctuations in contact pressure and friction force owing to the laminated pattern. These results suggest that the polishing process is crucial for improving the surface characteristics and mechanical performance of 3D-printed PLA parts.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"220 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141743296","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

Quantifying the effect of pulse-like ground motions on the seismic design of SMA restrained isolation bridges using probabilistic repair cost method 利用概率修复成本法量化脉冲地动对 SMA 约束隔震桥抗震设计的影响

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-21 DOI: 10.1088/1361-665x/ad5f6b

Jian Zhong, Yiwei Shu, Hao Wang and Chenxi Xing

{"title":"Quantifying the effect of pulse-like ground motions on the seismic design of SMA restrained isolation bridges using probabilistic repair cost method","authors":"Jian Zhong, Yiwei Shu, Hao Wang and Chenxi Xing","doi":"10.1088/1361-665x/ad5f6b","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5f6b","url":null,"abstract":"The shape memory alloy (SMA) restrainer serves as an effective but expensive bridge restraining device. However, the impact of pulse effect on SMA design approach under pulse-like ground motions (PLGM) has not been fully quantified in previous studies, which hinders its application in near-fault regions. Therefore, based on the risk probability assessment method throughout the entire life cycle, by accounting for the comprehensive repair cost of each component damage, this paper introduces a parameter design method for SMA restrainer of near-fault bridges that considers structural parameters, pulse parameters, and economic indicators. Firstly, the repair cost ratio (RCR) of bridge system, which means the expenses for repairs expressed as a proportion of bridge replacement costs, was regarded as the life-time optimization goal and overall performance indicator. Secondly, by accounting for near-fault effects, the relationship between RCR and SMA design parameters was established by convolution algorithm of probabilistic seismic hazard analysis, demand analysis and capacity analysis. A novel probabilistic seismic demand model was utilized to quickly determine the RCR of the bridge system under PLGM. Finally, the influence of pulse period on the rational design parameter of SMA restrainer was comprehensively investigated by RCR-based method. A seismic isolation arch bridge was selected as the illustrated case in this article. The results indicate that the rational design parameters of SMA exhibit a pattern of initially rising, then falling as the pulse period increases, reaching the peak value when the pulse period approaches bridge fundamental period. Moreover, the price parameter of SMA significantly affect the optimal design parameters, and the effective range is also recommended.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"339 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141743274","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 rotary self-sensing magnetorheological damper based on triboelectric nanogenerator 基于三电纳米发电机的旋转自感应磁流变阻尼器

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-17 DOI: 10.1088/1361-665x/ad5d32

Shiyu Zhao, Rongchang Hu, Guanghui Han, Huaxia Deng, Mengchao Ma, Xiang Zhong and Xinglong Gong

{"title":"A rotary self-sensing magnetorheological damper based on triboelectric nanogenerator","authors":"Shiyu Zhao, Rongchang Hu, Guanghui Han, Huaxia Deng, Mengchao Ma, Xiang Zhong and Xinglong Gong","doi":"10.1088/1361-665x/ad5d32","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5d32","url":null,"abstract":"A rotary self-sensing magnetorheological (MR) damper(RSMRD) based on a triboelectric nanogenerator is proposed in this study, which can provide variable torque and state self-sensing without a power supply. Compared with traditional self-sensing devices, the sensing part of RSMRD has the advantages of small size, no external power supply, and good low-frequency response. The feasibility of the angular velocity self-sensing (AVS) function is verified through theoretical derivation and experimental verification. The experimental results demonstrate a linear relationship between the output voltage generated by the AVS component and the rotational speed of the rotating shaft. Additionally, the torque characteristics of the rotary self-sensing MR damper are tested, revealing a torque generation of approximately 9.26 N m at a current of 1.6 A. Furthermore, a fuzzy control algorithm for vehicle braking is proposed, based on the model parameters of RSMRD. The simulink software is used to establish a dynamic model of 1/4 car braking, with an initial braking speed of 15 m s−1. The results indicate that the vehicle comes to a complete stop after 1.64 s, with a braking distance of 10.93 m. Throughout the braking process, the vehicle slip rate remains close to the optimal slip rate of 0.2.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"14 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141743275","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

Analytical and numerical evaluation of the effective properties of macro fiber composite (MFC) 宏观纤维复合材料（MFC）有效特性的分析和数值评估

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-10 DOI: 10.1088/1361-665x/ad5bce

Zhiqiang Fu, Yiping Shen, Songlai Wang and Jian Li

引用次数: 0

Mastering the art of designing mechanical metamaterials with quasi-zero stiffness for passive vibration isolation: a review 掌握设计用于被动隔振的准零刚度机械超材料的艺术：综述

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-10 DOI: 10.1088/1361-665x/ad5bcc

Ramin Hamzehei, Mahdi Bodaghi and Nan Wu

{"title":"Mastering the art of designing mechanical metamaterials with quasi-zero stiffness for passive vibration isolation: a review","authors":"Ramin Hamzehei, Mahdi Bodaghi and Nan Wu","doi":"10.1088/1361-665x/ad5bcc","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5bcc","url":null,"abstract":"This review serves as a comprehensive design strategy for designing quasi-zero stiffness (QZS) mechanical metamaterials (MMs). It discusses their underlying deformation mechanisms that enable the attainment of QZS behavior under both compressive and tensile loadings. While the QZS characteristic of metamaterials has garnered considerable attention, further research is essential to unlock their potential fully. Numerous QZS metamaterials have been meticulously reviewed. They comprise various elements and mechanisms, including positive and negative stiffness elements (PS and NS), PS elements with variable stiffness, bending mechanisms employing stiff joints/areas, buckling, buckling-rotating, and bending/buckling deformation mechanisms leading to a QZS feature. Furthermore, the capability of multi-material, adaptive, smart metamaterials, origami (bending around the hinge of the folded joints), and kirigami lattices (out-of-plane buckling via cutting patterns) are weighted. These diverse mechanisms contribute to achieving QZS behavior in metamaterials under both compression and tension loads, which is paramount for various mechanical applications such as passive vibration isolation. This review effectively categorizes QZS metamaterials based on their underlying mechanisms, providing scholars with valuable insights to identify suitable mechanisms for the desired QZS feature.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"6 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141588268","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

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