Tire and rubber track interchangeable chassis combines the advantages of tire and rubber track,which can greatly improve the maneuverability of military construction machinery.However,there is almost no effective calc...Tire and rubber track interchangeable chassis combines the advantages of tire and rubber track,which can greatly improve the maneuverability of military construction machinery.However,there is almost no effective calculation model for the real-time static steering torque.When the relative sliding speed is greater than 0.01 m/s,the influence of friction heating can not be ignored.An improved LuGre model is established to calculate the static real-time steering torque of tire and rubber track interchangeable chassis.Firstly,the friction heating model between rubber and ground is established.Combined with the influence of temperature on the dynamic performance of rubber material,the influence of friction heating on the stiffness and friction coefficient of rubber track is analyzed,and the improved LuGre friction model is established.The steering torque of tire and rubber track interchangeable chassis is affected by rubber material properties,steering speed,pavement type,and ambient temperature.Compared with the original Lu Gre model,the improved LuGre model captures the change in friction torque during multiple in-situ turns due to frictional heating.The error with the experimental data is small,which verifies the effectiveness of the improved LuGre model.展开更多
Since flat optics has the feature to implement a compact system,they are widely used in various applications to replace bulky refractive optics.However,they suffer from chromatic aberrations due to dispersion,limiting...Since flat optics has the feature to implement a compact system,they are widely used in various applications to replace bulky refractive optics.However,they suffer from chromatic aberrations due to dispersion,limiting their effectiveness to a narrow wavelength range.Consequently,diffractive optics has been applied for dynamic beam steering within a specific wavelength region or for static steering across multiple wavelengths.This limitation has made it challenging to implement dynamic beam steering in full-color display applications.To address this issue,we developed a multi-wavelength-based optical architecture that mitigates chromatic aberrations.This system incorporates color-selective retarders,half-wave plates,polarization plates,and beam deflectors.We experimentally demonstrated an achromatic beam deflector using a dynamic phase array in transmission mode,achieving continuous tunable beam steering over multiple wavelengths at 460,520,and 638 nm.展开更多
基金funded by the National Key Research and Development Program of China(Grant No.2016YFC0802900)。
文摘Tire and rubber track interchangeable chassis combines the advantages of tire and rubber track,which can greatly improve the maneuverability of military construction machinery.However,there is almost no effective calculation model for the real-time static steering torque.When the relative sliding speed is greater than 0.01 m/s,the influence of friction heating can not be ignored.An improved LuGre model is established to calculate the static real-time steering torque of tire and rubber track interchangeable chassis.Firstly,the friction heating model between rubber and ground is established.Combined with the influence of temperature on the dynamic performance of rubber material,the influence of friction heating on the stiffness and friction coefficient of rubber track is analyzed,and the improved LuGre friction model is established.The steering torque of tire and rubber track interchangeable chassis is affected by rubber material properties,steering speed,pavement type,and ambient temperature.Compared with the original Lu Gre model,the improved LuGre model captures the change in friction torque during multiple in-situ turns due to frictional heating.The error with the experimental data is small,which verifies the effectiveness of the improved LuGre model.
基金National Research Foundation(NRF)grants(RS-2024-00356928,RS-2024-00462912,RS-2024-00416272,RS-2024-00337012,RS-2024-00408286)funded by the Ministry of Science and ICT(MSIT)of the Korean government.K.W.acknowledges the NRF grant(RS-2023-00280938)funded by the MSIT of the Korean government.
文摘Since flat optics has the feature to implement a compact system,they are widely used in various applications to replace bulky refractive optics.However,they suffer from chromatic aberrations due to dispersion,limiting their effectiveness to a narrow wavelength range.Consequently,diffractive optics has been applied for dynamic beam steering within a specific wavelength region or for static steering across multiple wavelengths.This limitation has made it challenging to implement dynamic beam steering in full-color display applications.To address this issue,we developed a multi-wavelength-based optical architecture that mitigates chromatic aberrations.This system incorporates color-selective retarders,half-wave plates,polarization plates,and beam deflectors.We experimentally demonstrated an achromatic beam deflector using a dynamic phase array in transmission mode,achieving continuous tunable beam steering over multiple wavelengths at 460,520,and 638 nm.
