The method for analyzing the deformation of flexible skin under the air loads was developed based on the panel method and finite element method.The deformation of flexible skin under air pressures and effects of the l...The method for analyzing the deformation of flexible skin under the air loads was developed based on the panel method and finite element method.The deformation of flexible skin under air pressures and effects of the local deformation on the aerodynamic characteristics were discussed.Numerical results show that the flexible skin on the upper surface of trailing-edge will bubble under the air loads and the bubble has a powerful effect on the aerodynamic pressure near the surface of local deforma-tion.Then the stiffness requirements for flexible skin of variable trailing-edge were given by using the Jacobs rule,i.e.,the maximum displacement of skin is not greater than 0.1% of wing chord.Results show that the in-plane stiffness can be reduced by increasing the ratio of bending stiffness to in-plane stiffness.Although the deformation of flexible skin increases with the in-plane stiffness decreasing,it depends on the bending stiffness.When the bending stiffness exceeds critical value,the deformation of flexible skin only depends on the bending stiffness and has nothing to do with the in-plane stiffness.The conclusions can be used for the structural design of flexible skin.展开更多
This study investigates the friction and deformation behavior of the skin in contact with a rigid massage ball and its influencing factors.Pressing and stretching experiments were conducted using a collaborative robot...This study investigates the friction and deformation behavior of the skin in contact with a rigid massage ball and its influencing factors.Pressing and stretching experiments were conducted using a collaborative robot experimental platform.The experiments encompassed a loading normal force range of 2 N to 18 N and a sliding speed range of 10 mm/s to 20 mm/s.The friction response curve exhibits two different stages:static stick state and dynamic stick-slip stage,both of which have been mathematically modeled.By analyzing the experimental data,we analyzed the effects of elastic modulus,sliding speed and normal loading force on skin tangential friction and tensile deformation.The results indicate that as the normal load increases,both friction and deformation exhibit an increase.Conversely,they decrease with an increase in elastic modulus.Notably,while deformation diminishes with higher sliding speed,friction force remains relatively unaffected by velocity.This observation can be attributed to the strain rate sensitivity resulting from the viscoelastic characteristics of the skin under substantial deformation.This study advances the understanding of friction and deformation behavior during skin friction,offering valuable insights to enhance the operational comfort of massage robots.展开更多
基金Supported by China Postdoctoral Science Foundation (Grant No 20080440888)
文摘The method for analyzing the deformation of flexible skin under the air loads was developed based on the panel method and finite element method.The deformation of flexible skin under air pressures and effects of the local deformation on the aerodynamic characteristics were discussed.Numerical results show that the flexible skin on the upper surface of trailing-edge will bubble under the air loads and the bubble has a powerful effect on the aerodynamic pressure near the surface of local deforma-tion.Then the stiffness requirements for flexible skin of variable trailing-edge were given by using the Jacobs rule,i.e.,the maximum displacement of skin is not greater than 0.1% of wing chord.Results show that the in-plane stiffness can be reduced by increasing the ratio of bending stiffness to in-plane stiffness.Although the deformation of flexible skin increases with the in-plane stiffness decreasing,it depends on the bending stiffness.When the bending stiffness exceeds critical value,the deformation of flexible skin only depends on the bending stiffness and has nothing to do with the in-plane stiffness.The conclusions can be used for the structural design of flexible skin.
基金supported in part by the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515010682)。
文摘This study investigates the friction and deformation behavior of the skin in contact with a rigid massage ball and its influencing factors.Pressing and stretching experiments were conducted using a collaborative robot experimental platform.The experiments encompassed a loading normal force range of 2 N to 18 N and a sliding speed range of 10 mm/s to 20 mm/s.The friction response curve exhibits two different stages:static stick state and dynamic stick-slip stage,both of which have been mathematically modeled.By analyzing the experimental data,we analyzed the effects of elastic modulus,sliding speed and normal loading force on skin tangential friction and tensile deformation.The results indicate that as the normal load increases,both friction and deformation exhibit an increase.Conversely,they decrease with an increase in elastic modulus.Notably,while deformation diminishes with higher sliding speed,friction force remains relatively unaffected by velocity.This observation can be attributed to the strain rate sensitivity resulting from the viscoelastic characteristics of the skin under substantial deformation.This study advances the understanding of friction and deformation behavior during skin friction,offering valuable insights to enhance the operational comfort of massage robots.
