There may be more than 2% strain of carbon fiber composite material on solid rocket motor （SRM） in some extreme cases. A surface-bonded silica fiber Bragg grating （FBG） strain sensor coated by polymer is designed ...There may be more than 2% strain of carbon fiber composite material on solid rocket motor （SRM） in some extreme cases. A surface-bonded silica fiber Bragg grating （FBG） strain sensor coated by polymer is designed to detect the large strain of composite material. The strain transfer relation of the FBG large strain sensor is deduced, and the strain transfer mechanism is verified by finite element simulation. To calibrate the sensors, the tensile test is done by using the carbon fiber composite plate specimen attached to the designed strain sensor. The results show that the designed sensor can detect the strain more than 3%, the strain sensitivity is 0.0762pm/με, the resolution is 13.13με, and the fitting degree of the wavelength-strain curve fitting function is 0.9988. The accuracy and linearity of the sensor can meet the engineering requirements.展开更多
Flexible strain sensors are essential in fields such as medicine,sports,robotics,and virtual reality but face challenges in achieving excellent sensing performance and accurate multi-directional detection simultaneous...Flexible strain sensors are essential in fields such as medicine,sports,robotics,and virtual reality but face challenges in achieving excellent sensing performance and accurate multi-directional detection simultaneously.To address this issue,we have developed a spider-web structured multi-directional flexible strain sensor using Ti_(3)C_(2)T_(x)(MXene)conductive ink and three-dimensional(3D)printing technology.Combined with a multi-class,multi-output neural network model algorithm,the sensor achieves signal decoupling from the sensor array,allowing for precise detection of strain direction and intensity.It exhibits good sensitivity(gauge factor~26.3),a moderate sensing range(0%-10%),and high reliability(1000 stretching cycles).Using neural network algorithms,a four-unit spider-web sensor array achieves approximately 97% accuracy in identifying strain intensity and direction within the 0%-10% strain range under various surface stimuli.Additionally,it can track complex human motions,demonstrating significant potential in applications such as motion monitoring and human-machine interaction.展开更多
The present paper develops a new method for damage localization and severity estimation based on the employment of modal strain energy. This method is able to determine the damage locations and estimate their severiti...The present paper develops a new method for damage localization and severity estimation based on the employment of modal strain energy. This method is able to determine the damage locations and estimate their severities, requiring only the information about the changes of a few lower natural frequencies. First, a damage quantification method is formulated and iterative approach is adopted for determining the damage extent. Then a damage localization algorithm is proposed, in which a damage indicator is formulated where unity value corresponds to the true damage scenario. Finally, numerical studies and model tests are conducted to demonstrate the effectiveness of the developed algorithm.展开更多
Rapid development ofwearable electronicswith various functionalities has stimulated the demand to construct functional fiber devices due to their merits of mechanical flexibility,weavability,miniaturization,and integr...Rapid development ofwearable electronicswith various functionalities has stimulated the demand to construct functional fiber devices due to their merits of mechanical flexibility,weavability,miniaturization,and integrability.To this end,fiber components which can realize the functions of energy storage and conversion,actuating plus sensing have gained increasing concerns.Herein,we summarize the recent progress with respect to fiber material preparation,innovative structure design,and device performance in this review,also highlighting the possibility of integrated fiber electronics as an extension of application,the remaining challenges and future perspectives toward next-generation smart systems and to facilitate their commercialization.展开更多
文摘There may be more than 2% strain of carbon fiber composite material on solid rocket motor （SRM） in some extreme cases. A surface-bonded silica fiber Bragg grating （FBG） strain sensor coated by polymer is designed to detect the large strain of composite material. The strain transfer relation of the FBG large strain sensor is deduced, and the strain transfer mechanism is verified by finite element simulation. To calibrate the sensors, the tensile test is done by using the carbon fiber composite plate specimen attached to the designed strain sensor. The results show that the designed sensor can detect the strain more than 3%, the strain sensitivity is 0.0762pm/με, the resolution is 13.13με, and the fitting degree of the wavelength-strain curve fitting function is 0.9988. The accuracy and linearity of the sensor can meet the engineering requirements.
基金supported by the National Natural Science Foundation of China(Nos.52422505 and 12274124)the Shanghai Pilot Program for Basic Research(No.22TQ1400100-6)+1 种基金the Fundamental Research Funds for the Central Universitiesthe Innovative Research Group Project of the National Natural Science Foundation of China(No.52321002).
文摘Flexible strain sensors are essential in fields such as medicine,sports,robotics,and virtual reality but face challenges in achieving excellent sensing performance and accurate multi-directional detection simultaneously.To address this issue,we have developed a spider-web structured multi-directional flexible strain sensor using Ti_(3)C_(2)T_(x)(MXene)conductive ink and three-dimensional(3D)printing technology.Combined with a multi-class,multi-output neural network model algorithm,the sensor achieves signal decoupling from the sensor array,allowing for precise detection of strain direction and intensity.It exhibits good sensitivity(gauge factor~26.3),a moderate sensing range(0%-10%),and high reliability(1000 stretching cycles).Using neural network algorithms,a four-unit spider-web sensor array achieves approximately 97% accuracy in identifying strain intensity and direction within the 0%-10% strain range under various surface stimuli.Additionally,it can track complex human motions,demonstrating significant potential in applications such as motion monitoring and human-machine interaction.
基金supported by the National Natural Science Foundation of China (50909088, 51010009)Science & Technology Development Project of Qingdao (09-1-3-18-jch)Program for New Century Excellent Talents in University (NCET-10-0762)
文摘The present paper develops a new method for damage localization and severity estimation based on the employment of modal strain energy. This method is able to determine the damage locations and estimate their severities, requiring only the information about the changes of a few lower natural frequencies. First, a damage quantification method is formulated and iterative approach is adopted for determining the damage extent. Then a damage localization algorithm is proposed, in which a damage indicator is formulated where unity value corresponds to the true damage scenario. Finally, numerical studies and model tests are conducted to demonstrate the effectiveness of the developed algorithm.
基金NationalNatural Science Foundation ofChina,Grant/Award Numbers:51872139,51903121Natural Science Foundation ofJiangsu Province,Grant/Award Number:BK20190683+2 种基金Natural Science Foundationof Jiangsu Higher Education Institutions,Grant/Award Number:18KJB150016“SixTalent Peak”Project of Jiangsu Province,Grant/Award Numbers:XCL-043,XCL-018Natural Science BasicResearch ProgramofShaanxi,Grant/Award Number:2019JLM-28。
文摘Rapid development ofwearable electronicswith various functionalities has stimulated the demand to construct functional fiber devices due to their merits of mechanical flexibility,weavability,miniaturization,and integrability.To this end,fiber components which can realize the functions of energy storage and conversion,actuating plus sensing have gained increasing concerns.Herein,we summarize the recent progress with respect to fiber material preparation,innovative structure design,and device performance in this review,also highlighting the possibility of integrated fiber electronics as an extension of application,the remaining challenges and future perspectives toward next-generation smart systems and to facilitate their commercialization.
