A spacecraft＇s separation parameters directly affect its flying trace. If the parameters exceed their limits, it will be difficult to adjust the flying attitude of the spacecraft, and the spacescraft may go off-track...A spacecraft＇s separation parameters directly affect its flying trace. If the parameters exceed their limits, it will be difficult to adjust the flying attitude of the spacecraft, and the spacescraft may go off-track or crash. In this paper, we present a composite optimization method, which combines angular velocities with external moments for separation parameters of large-eccentricity pico-satellites. By changing the positions of elastic launch devices, the method effectively controls the popping process under the condition of less change in the separation mechanism. Finally, the reasons for deviation of angular velocities and unreliable optimization results are presented and analyzed. This optimization method is proved through a ground test which offsets the gravity. Simulation and test results show that the optimization method can effectively optimize the separation parameters of large-eccentricity pico-satellites. The proposed method adapts particularly to the fixed and non-stable status elastic parameters, the distribution of all kinds of elastic devices, and large-eccentricity spacecrafts for which attitude corrections are difficult. It is gen- erally applicable and easy to operate in practical applications.展开更多
With the continuous development of society,the dyeing and finishing field is transitioning towards green sustainability and multifunctionality.The main direction is to dye fabrics using natural dyes with the aid of mo...With the continuous development of society,the dyeing and finishing field is transitioning towards green sustainability and multifunctionality.The main direction is to dye fabrics using natural dyes with the aid of mordants.In recent years,the technology of biological mordant dyeing with natural dyes has become a research hotspot.This paper first discusses in detail the application of biological mordant technology with natural dyes on various types of dyed fabrics,including plant fibers,animal fibers,and synthetic fibers.It then introduces the application of biological mordant dyeing with natural dyes in fields such as antibacterial and ultraviolet protection.By comparing the environmental impact and effectiveness of metal mordants versus biological mordants on dyed fabrics,the most suitable mordant is identified.Finally,the paper provides an outlook on the optimization of the dyeing process,in-depth exploration of mechanisms,rational selection of resources,and functional application trends of biological mordant technology with natural dyes,aiming to provide a reference for research directions in this field.展开更多
基金Project supported by the National Natural Science Foundation of China(No.61525403)
文摘A spacecraft＇s separation parameters directly affect its flying trace. If the parameters exceed their limits, it will be difficult to adjust the flying attitude of the spacecraft, and the spacescraft may go off-track or crash. In this paper, we present a composite optimization method, which combines angular velocities with external moments for separation parameters of large-eccentricity pico-satellites. By changing the positions of elastic launch devices, the method effectively controls the popping process under the condition of less change in the separation mechanism. Finally, the reasons for deviation of angular velocities and unreliable optimization results are presented and analyzed. This optimization method is proved through a ground test which offsets the gravity. Simulation and test results show that the optimization method can effectively optimize the separation parameters of large-eccentricity pico-satellites. The proposed method adapts particularly to the fixed and non-stable status elastic parameters, the distribution of all kinds of elastic devices, and large-eccentricity spacecrafts for which attitude corrections are difficult. It is gen- erally applicable and easy to operate in practical applications.
基金College Student Innovation and Entrepreneurship Training Program Project(X202413561129)。
文摘With the continuous development of society,the dyeing and finishing field is transitioning towards green sustainability and multifunctionality.The main direction is to dye fabrics using natural dyes with the aid of mordants.In recent years,the technology of biological mordant dyeing with natural dyes has become a research hotspot.This paper first discusses in detail the application of biological mordant technology with natural dyes on various types of dyed fabrics,including plant fibers,animal fibers,and synthetic fibers.It then introduces the application of biological mordant dyeing with natural dyes in fields such as antibacterial and ultraviolet protection.By comparing the environmental impact and effectiveness of metal mordants versus biological mordants on dyed fabrics,the most suitable mordant is identified.Finally,the paper provides an outlook on the optimization of the dyeing process,in-depth exploration of mechanisms,rational selection of resources,and functional application trends of biological mordant technology with natural dyes,aiming to provide a reference for research directions in this field.
