Smart Materials and Structures最新文献_第8页

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

Recovering energy from door opening and closing process using a parallel crank-slider harvester in buildings 在建筑物中使用并联曲柄滑块收割机回收门开关过程中的能量

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-07-01 DOI: 10.1088/1361-665x/ad5b30

Limin Ren, Shuqing Wang, Wenqiang Zhang, Yubao Cao, Pan Zhang, Xinyu Wang and Yisong Tan

{"title":"Recovering energy from door opening and closing process using a parallel crank-slider harvester in buildings","authors":"Limin Ren, Shuqing Wang, Wenqiang Zhang, Yubao Cao, Pan Zhang, Xinyu Wang and Yisong Tan","doi":"10.1088/1361-665x/ad5b30","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5b30","url":null,"abstract":"Recovering kinetic energy from the environment is mostly focused on the natural environment, while there is also a huge energy in the human living environment. The swing door is an indispensable equipment in the human living environment. The bidirectional swing of the door opening and closing process is rich in energy generated by human motion and thus has a large potential for energy recovery. An energy harvester for recovering bidirectional kinetic energy of the door in buildings is proposed, fabricated, analyzed, and tested. The energy harvester consists of a parallel crank-slider mechanism, a transmission mechanism and a power generation module. The external linkage is used to connect the door and the energy harvester to transmit the bidirectional swing of the door. The parallel crank-slider mechanism is coupled with two one-way bearings. This can realize the conversion of the bidirectional swing of the door to the unidirectional rotation of the central shaft. The final mechanical rectification effect is achieved. Kinematic and dynamic analyses are performed to determine the factors affecting the power generation performance. A prototype is fabricated, and experiments are conducted on it by simulating the process of opening and closing the door. The experimental results are consistent with the simulation ones. At a normal opening velocity of 90° s−1, the maximum open-circuit voltage of the harvester is 7.06 V and the average output power is 1.03 W. The highest efficiency of the harvester can reach 69.65%. The recovered energy is capable of powering the smart door lock for at least 150 s, as well as powering devices such as door lights and doorbells. This can meet the power supply needs of most electronic devices on doors in human life.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"360 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530526","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

Modelling and characterisation of a magnetically coupled piezoelectric beam for energy harvesting gear meshing motion 用于能量采集齿轮啮合运动的磁耦合压电梁的建模和特性分析

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-06-30 DOI: 10.1088/1361-665x/ad59e7

Huifang Xiao, Xuyang Guan, Fan Zhang, Gang Liang, Yihu Tang and Chris Bowen

{"title":"Modelling and characterisation of a magnetically coupled piezoelectric beam for energy harvesting gear meshing motion","authors":"Huifang Xiao, Xuyang Guan, Fan Zhang, Gang Liang, Yihu Tang and Chris Bowen","doi":"10.1088/1361-665x/ad59e7","DOIUrl":"https://doi.org/10.1088/1361-665x/ad59e7","url":null,"abstract":"Gear transmission systems are crucial components for transmitting power and motion in a host of engineering applications. Recently, the potential to embed sensors into transmission components has attracted significant attention for accurate condition monitoring of system health. As a result, embedded sensors must operate in a safe and stable manner, whilst being able to provide a continuous power-supply and ensure operational autonomy. In this work, a magnetically coupled beam-type piezoelectric energy harvester is developed for energy harvesting of rotational centrifugal forces and individual gear meshing excitation events. A new coupled electromechanical dynamic model is developed to explain the working principle and response of the harvester when excited by a combination of gear meshing excitation events, a centrifugal force, and a magnetic force. Since gear meshing events are observed to lead to an increased hardening nonlinearity of the energy harvester, and a decrease in power output, a novel variable-section cantilever structure was developed. Our detailed theoretical analysis demonstrates that the novel variable stiffness structure improves both the power output and bandwidth, with excellent agreement with experimental measurements. This work provides new theoretical insights into the application of magnetically coupled piezoelectric energy harvesters for self-powered sensing systems for critical gear transmission systems.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"73 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513525","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

Robustness analysis for the vibration control performance of energy-harvesting tuned mass damper with uncertainties 具有不确定性的能量收集调谐质量阻尼器振动控制性能的鲁棒性分析

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-06-30 DOI: 10.1088/1361-665x/ad59e5

Cai Qinlin, Lu Ping, Chen Yuanbin and Shi Xiang

{"title":"Robustness analysis for the vibration control performance of energy-harvesting tuned mass damper with uncertainties","authors":"Cai Qinlin, Lu Ping, Chen Yuanbin and Shi Xiang","doi":"10.1088/1361-665x/ad59e5","DOIUrl":"https://doi.org/10.1088/1361-665x/ad59e5","url":null,"abstract":"Energy-harvesting vibration control strategy has been proposed and applied in different applications, including but not limited to automotive, mechanical, and civil engineering. However, when facing uncertainties from both internal and external environments, the robustness of its performance has rarely been evaluated. The energy-harvesting tuned mass damper (EHTMD) is a representative vibration control device integrated with the energy-harvesting function. This study investigates the robustness of an EHTMD installed on a structure with multi-uncertainties. First, the EHTMD modeling, the interval model, and the robustness evaluation framework are introduced. Uncertainties are considered for all parameters of an EHTMD, including the mechanical units, electromagnetic damper, and energy harvesting circuit. Subsequently, a series of dynamic simulations are performed on a damped benchmark single-degree-of-freedom frame with an EHTMD. The lower- and upper-bound structural vibration and generated power are estimated under free-vibration, harmonic-excitation, and random-excitation scenarios. The EHTMD performance robustness is evaluated through the interval response by incorporating the first-passage theory. The key factors in EHTMD that influence its robustness are identified. Results indicate promising robustness when using the energy-harvesting vibration control strategy to replace the conventional dampers, addressing one of the often-questioned issues of the energy-harvesting vibration control strategy.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"21 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530527","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

Quantitative characterization of fatigue damage in plate structures based on FSOM 基于 FSOM 的板结构疲劳损伤定量表征

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-06-30 DOI: 10.1088/1361-665x/ad5a58

Chunbing Zhang, Xiaofeng Liu, Daiping Wei and Lin Bo

引用次数: 0

Soft robotic fingers with sensorized pre-charged finger pulp 带有感应式预充电指浆的柔软机器人手指

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-06-30 DOI: 10.1088/1361-665x/ad5a5b

Zihui Zhu, Yang Yang, Shaoyang Yan, Songyan Wang, Yuan Xie, Yili Fu, Yunquan Li and Pei Jiang

{"title":"Soft robotic fingers with sensorized pre-charged finger pulp","authors":"Zihui Zhu, Yang Yang, Shaoyang Yan, Songyan Wang, Yuan Xie, Yili Fu, Yunquan Li and Pei Jiang","doi":"10.1088/1361-665x/ad5a5b","DOIUrl":"https://doi.org/10.1088/1361-665x/ad5a5b","url":null,"abstract":"Pneumatically driven soft actuators with sensors have been developing rapidly these years. They can perceive external stimulus and be applied to different scenarios. In this study, we present a novel soft robotic finger with sensorized finger pulp based on sealing a flexible fabric piezoresistive film called Velostat into a pre-charged air bag, which can perceive the contact force with an object based on changes in resistance value of the sensor. The soft sensor mimics human finger pulp and deforms passively according to the shape of objects during grasping, so that it can firmly contact with objects and as such improves the gripper’s grasping stability. Moreover, based on force feedback, the actuator can reduce or increase the input pressure to hold the object and control the contact force precisely. The sensor exhibits a sensitivity of up to 0.328 kPa−1 and can measure pressures ranging from 0 to over 10 kPa. The sensor’s measurement range and sensitivity can be pre-adjusted by regulating the pre-charged pressure during fabrication for different grasping tasks. The response/recovery time of the sensor is 80/60 ms on average. Experiments show that the finger with sensorized pulp can be applied for object softness and size detection, object transport minitoring as well as force control grasping. The proposed soft robotic finger has potential for applications in scenarios that require safe contact and closed-loop control.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"185 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513526","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