Magnetorheological elastomer （MRE） is a new kind of smart materials, the rheological properties can be controlled rapidly by the external magnetic field. It is mainly composed of rubber and micron-sized ferromagneti...Magnetorheological elastomer （MRE） is a new kind of smart materials, the rheological properties can be controlled rapidly by the external magnetic field. It is mainly composed of rubber and micron-sized ferromagnetic particles, which forms a chain-like structure. Therefore its mechanical, electric, and magnetic properties can be changed by the applied magnetic field, which is called as the magneto-induced effect. But this effect is not remarkable enough currently for the engineering application. So it is important for material preparation to optimize parameters to enhance the magneto-induced effect. In this work, based on chain-like model, some factors influencing the magneto-induced effect of MRE were analyzed theoretically by using dipole method with the normal distribution of chain＇s angle introduced. The factors included the oblique angle of particles chains, magnetic field intensity, and shear strain, etc. Some experiments were also carried out.展开更多
Soft starters are effective devices used to provide overload protection for motors from large mechanical shocks during the start-up period.However,existing soft starters require additional power supplies,sensors,and c...Soft starters are effective devices used to provide overload protection for motors from large mechanical shocks during the start-up period.However,existing soft starters require additional power supplies,sensors,and complex control elements that pose serious challenges to the integration,versatility,and operability of mechanical transmission system.Herein,we propose a newly soft starter based on the triboelectric nanogenerator(TENG)and electrorheological fluid(ERF)to realize a self-powered mechanical transmission system.Both ERF’s rheological characteristic and the baffle structure play a role in the torque of device.Driven by TENG,the soft starter with optimized baffle achieves a 715%growth in transmission torque compared to that of the device without baffle.And a smooth start is obtained with transmission speeds ranging from 0%to 100%.In application demonstration,this triboelectric soft starter(TSS)has the capacity to gain a smooth operation of the high-speed motor.In contrast,the direct start generates an overshoot,leading to a break in the conveyor belt.The TSS designed in this work with the advantages of self-powered,highly integrated,easy to operate,and low cost,provides a prospective strategy for broadening the application of TENG in mechanical transmission systems.展开更多
基金This work was supported by the National Natural Science Foundation of China （No.50830202 and No.60804018） and the Plan of the Excellent Talent for the New Century （NCET-07-0910）. The authors also appreciate the help in the experimental instruments of Professor Xing-long Gong of University of Science and Technology of China deeply.
文摘Magnetorheological elastomer （MRE） is a new kind of smart materials, the rheological properties can be controlled rapidly by the external magnetic field. It is mainly composed of rubber and micron-sized ferromagnetic particles, which forms a chain-like structure. Therefore its mechanical, electric, and magnetic properties can be changed by the applied magnetic field, which is called as the magneto-induced effect. But this effect is not remarkable enough currently for the engineering application. So it is important for material preparation to optimize parameters to enhance the magneto-induced effect. In this work, based on chain-like model, some factors influencing the magneto-induced effect of MRE were analyzed theoretically by using dipole method with the normal distribution of chain＇s angle introduced. The factors included the oblique angle of particles chains, magnetic field intensity, and shear strain, etc. Some experiments were also carried out.
基金Guo,H.Y.want to acknowledge the support from the National Key Research and Development Program(No.2021YFA1201602)the Graduate Research and Innovation Foundation of Chongqing,China(No.CYB22047)+3 种基金the National Natural Science Foundation of China(NSFC)(Nos.62004017 and U21A20147)This research was also supported by the Scientific and Technology Research Program of Chongqing Municipal Education Commission(Nos.KJQN202100522 and KJQN202200514)the Natural Science Foundation of Chongqing(No.cstc2021jcyj-msxmX0746)the Dr.“Through Train”Scientific Research Program(No.CSTB2022BSXM-JCX0091).
文摘Soft starters are effective devices used to provide overload protection for motors from large mechanical shocks during the start-up period.However,existing soft starters require additional power supplies,sensors,and complex control elements that pose serious challenges to the integration,versatility,and operability of mechanical transmission system.Herein,we propose a newly soft starter based on the triboelectric nanogenerator(TENG)and electrorheological fluid(ERF)to realize a self-powered mechanical transmission system.Both ERF’s rheological characteristic and the baffle structure play a role in the torque of device.Driven by TENG,the soft starter with optimized baffle achieves a 715%growth in transmission torque compared to that of the device without baffle.And a smooth start is obtained with transmission speeds ranging from 0%to 100%.In application demonstration,this triboelectric soft starter(TSS)has the capacity to gain a smooth operation of the high-speed motor.In contrast,the direct start generates an overshoot,leading to a break in the conveyor belt.The TSS designed in this work with the advantages of self-powered,highly integrated,easy to operate,and low cost,provides a prospective strategy for broadening the application of TENG in mechanical transmission systems.
