This study proposed an intelligent tire solution to predict tire-pavement friction from tire sensors using an integrated modeling-sensing approach.A laboratory platform is built to conduct dynamic tire tests under dif...This study proposed an intelligent tire solution to predict tire-pavement friction from tire sensors using an integrated modeling-sensing approach.A laboratory platform is built to conduct dynamic tire tests under different operating parameters and surface conditions.Pressure-based sensors were embedded in the tire tread rubber to measure local forces on the tire contact patch.Physics-based models are built to interpret the friction generation mechanisms and predict the global friction force from sensor measurements.The tire−pavement interaction model consists of a Brush model for tire−pavement contact,a flexible ring model for tire stress and strain,and energy dissipation theory.The flexible ring model parameters are first calibrated with tire load−deflection curves.The feasible dynamic friction coefficients and the deformed tire profile were then solved using an interactive process among the three models using sensor measurements.Finally,the predicted friction forces were compared with the reference measurements from load cells to evaluate the prediction accuracy.The results confirmed the capability of smart tire sensing for estimating tire−pavement friction coefficients at various slip ratios under different surface conditions,which shows the potential for friction-informed vehicle control and safe driving.展开更多
A novel 3D interactive painting method for Chinese calligraphy and painting based on force feedback technology is proposed. The relationship between the force exerted on the brush and the resulting brush deformation i...A novel 3D interactive painting method for Chinese calligraphy and painting based on force feedback technology is proposed. The relationship between the force exerted on the brush and the resulting brush deformation is analyzed and a spring-mass model is used to build a model of the 3D Chinese brush. The 2D brush footprint between the brush and the plane of the paper or object is calculated according to the deformation of the 3D brush when force is exerted on the 3D brush. Then the 3D brush footprint is obtained by projecting the 2D brush footprint onto the surface of the 3D object in real time, and a complete 3D brushstroke is obtained by superimposing 3D brush footprints along the painting direction. The proposed method has been suc- cessfully applied in a virtual 3D interactive drawing system based on force feedback technology. In this system, users can paint 3D brushstrokes in real time with a Phantom Desktop haptic device, which can effectively serve as a virtual reality interface to the simulated painting environment for users.展开更多
文摘This study proposed an intelligent tire solution to predict tire-pavement friction from tire sensors using an integrated modeling-sensing approach.A laboratory platform is built to conduct dynamic tire tests under different operating parameters and surface conditions.Pressure-based sensors were embedded in the tire tread rubber to measure local forces on the tire contact patch.Physics-based models are built to interpret the friction generation mechanisms and predict the global friction force from sensor measurements.The tire−pavement interaction model consists of a Brush model for tire−pavement contact,a flexible ring model for tire stress and strain,and energy dissipation theory.The flexible ring model parameters are first calibrated with tire load−deflection curves.The feasible dynamic friction coefficients and the deformed tire profile were then solved using an interactive process among the three models using sensor measurements.Finally,the predicted friction forces were compared with the reference measurements from load cells to evaluate the prediction accuracy.The results confirmed the capability of smart tire sensing for estimating tire−pavement friction coefficients at various slip ratios under different surface conditions,which shows the potential for friction-informed vehicle control and safe driving.
基金Project supported by the National Natural Science Foundation of China （No. 51175058）
文摘A novel 3D interactive painting method for Chinese calligraphy and painting based on force feedback technology is proposed. The relationship between the force exerted on the brush and the resulting brush deformation is analyzed and a spring-mass model is used to build a model of the 3D Chinese brush. The 2D brush footprint between the brush and the plane of the paper or object is calculated according to the deformation of the 3D brush when force is exerted on the 3D brush. Then the 3D brush footprint is obtained by projecting the 2D brush footprint onto the surface of the 3D object in real time, and a complete 3D brushstroke is obtained by superimposing 3D brush footprints along the painting direction. The proposed method has been suc- cessfully applied in a virtual 3D interactive drawing system based on force feedback technology. In this system, users can paint 3D brushstrokes in real time with a Phantom Desktop haptic device, which can effectively serve as a virtual reality interface to the simulated painting environment for users.
