Flexible hybrid systems usually combine soft modules(mechanically matched with skin or clothes)and hard modulus(like rigid circuits).However,the risk of interface failure due to modulus mismatch between flexible compo...Flexible hybrid systems usually combine soft modules(mechanically matched with skin or clothes)and hard modulus(like rigid circuits).However,the risk of interface failure due to modulus mismatch between flexible components and rigid circuits limits the system’s complexity and durability.The diverse features of flexible components further complicate the development of a universal interface.In this work,we demonstrated a cocoon-mimetic feature-matched interface(CFI)that offers stable electrical contact with flexible surface.It also matches flexible systems features in stretchability(lower than 0.22Ωcm^(-1)during 900%elongation),durability(stable resistance after 20000 times 100%elongation),breathability(gas permeability 614 mm S^(-1))and self-adhesive(0.18±0.01 N mm^(-1)).We developed a direct spray-on-skin sensor and used CFI to form a hand task recognition system.This system,deployable in seconds,has 97.7%accuracy in recognition of eight hand tasks.This research offers a promising solution for flexible hybrid systems interfacing challenges.展开更多
The efficiency and accuracy are two most concerned issues in the modeling and simulation of multi-body systems involving contact and impact. This paper proposed a formulation based on the component mode synthesis meth...The efficiency and accuracy are two most concerned issues in the modeling and simulation of multi-body systems involving contact and impact. This paper proposed a formulation based on the component mode synthesis method for planar contact problems of flexible multi-body systems. A flexible body is divided into two parts： a contact zone and an un-contact zone. For the un-contact zone, by using the fixed-interface substructure method as reference, a few low-order modal coordinates are used to replace the nodal coordinates of the nodes, and meanwhile, the nodal coordinates of the local impact region are kept unchanged, therefore the total degrees of freedom （DOFs） are greatly cut down and the computational cost of the simulation is significantly reduced. By using additional constraint method, the impact constraint equations and kinematic constraint equations are derived, and the Lagrange equations of the first kind of flexible multi-body system are obtained. The impact of an elastic beam with a fixed half disk is simulated to verify the efficiency and accuracy of this method.展开更多
基金supported by the National Key Research and Development Program of China(2021YFC3002200)the National Natural Science Foundation of China(U20A20168)+1 种基金the Scientific and Technological Innovation Project of China Academy of Chinese Medical Sciences(CI2023C002YG,ZN2023A01)a grant from the Guoqiang Institute,Tsinghua University.
文摘Flexible hybrid systems usually combine soft modules(mechanically matched with skin or clothes)and hard modulus(like rigid circuits).However,the risk of interface failure due to modulus mismatch between flexible components and rigid circuits limits the system’s complexity and durability.The diverse features of flexible components further complicate the development of a universal interface.In this work,we demonstrated a cocoon-mimetic feature-matched interface(CFI)that offers stable electrical contact with flexible surface.It also matches flexible systems features in stretchability(lower than 0.22Ωcm^(-1)during 900%elongation),durability(stable resistance after 20000 times 100%elongation),breathability(gas permeability 614 mm S^(-1))and self-adhesive(0.18±0.01 N mm^(-1)).We developed a direct spray-on-skin sensor and used CFI to form a hand task recognition system.This system,deployable in seconds,has 97.7%accuracy in recognition of eight hand tasks.This research offers a promising solution for flexible hybrid systems interfacing challenges.
基金supported by the National Natural Science Foundation of China (11132007 and 11272203)
文摘The efficiency and accuracy are two most concerned issues in the modeling and simulation of multi-body systems involving contact and impact. This paper proposed a formulation based on the component mode synthesis method for planar contact problems of flexible multi-body systems. A flexible body is divided into two parts： a contact zone and an un-contact zone. For the un-contact zone, by using the fixed-interface substructure method as reference, a few low-order modal coordinates are used to replace the nodal coordinates of the nodes, and meanwhile, the nodal coordinates of the local impact region are kept unchanged, therefore the total degrees of freedom （DOFs） are greatly cut down and the computational cost of the simulation is significantly reduced. By using additional constraint method, the impact constraint equations and kinematic constraint equations are derived, and the Lagrange equations of the first kind of flexible multi-body system are obtained. The impact of an elastic beam with a fixed half disk is simulated to verify the efficiency and accuracy of this method.
