Space exploration has become a major focus in the field of technology,with gear transmissions in aerospace equipment playing a crucial role.In the extreme environment of space,gear transmissions face challenges like l...Space exploration has become a major focus in the field of technology,with gear transmissions in aerospace equipment playing a crucial role.In the extreme environment of space,gear transmissions face challenges like large temperature differentials,deformation and maintenance difficulties,which will severely impact transmission accuracy and service life.To meet the growing demands for high-performance gear transmissions with high transmission efficiency and error adaptability in the aerospace field,this paper proposes a novel curve-surface conjugate internal gear drive consisting of an involute internal gear and a curve-surface gear.The fundamental theory of curve-surface conjugation is introduced,and the construction method for curve-surface gear based on a selected contact path and meshing tube is presented.The analysis models including induced curvature,sliding ratio and tooth contact analysis with errors(ETCA)are simulated to evaluate the meshing characteristics.Additionally,prototypes are manufactured and experimental setups are established to validate the transmission performance.These results indicate that as the rotational speed increases,the transmission efficiency of the curve-surface conjugate internal gear drive improves,which is contrary to the trend observed in involute gear drives.And the transmission efficiency of the curve-surface conjugate internal gear drive surpasses that of the involute gear drive at higher rotational speeds.Moreover,this novel gear drive exhibits excellent error adaptability,maintaining intact contact paths and high transmission efficiency even in the presence of assembly errors.This study provides new ideas for the design and manufacture of high-performance gear transmissions from the perspective of spatial geometric elements.展开更多
In order to sustain and increase students＇ interest in learning English, we tried to design several motivational approaches based on teaching psychology and pedagogy so as to improve our English teaching. The three o...In order to sustain and increase students＇ interest in learning English, we tried to design several motivational approaches based on teaching psychology and pedagogy so as to improve our English teaching. The three orientations were identified to be the principles for the study： 1.Inspiration out of tracing the retrogression to its source; 2.Stimulating learning through integrative internal and external drives; 3.Providing chances to get more inspiration of creativity. The study of integrative motivation was made for two years, which turned out to be efficacious in our English teaching when it was finished.展开更多
Autonomous learning emphasizes that students are the masters of learning and learning is the independent behavior of students, but it needs the help of teachers and parents. In educational activities, only by actively...Autonomous learning emphasizes that students are the masters of learning and learning is the independent behavior of students, but it needs the help of teachers and parents. In educational activities, only by actively enabling students to become knowledge seekers, allowing them to actively study and use in an innovative spirit, and by acquiring knowledge to improve their learning ability and innovation awareness, can students' subjective initiative be brought into full play, positive research and development be promoted, and positive self-efficacy be created. Then, how should we achieve the ideal state of letting students study independently? The following is a study on this.展开更多
Human rights, as a great term and lofty goal, have unquestionably become a topic of mainstream talk in the present-day world.2 Such mainstream talk has been internal- ized into part of the social structure. The curren...Human rights, as a great term and lofty goal, have unquestionably become a topic of mainstream talk in the present-day world.2 Such mainstream talk has been internal- ized into part of the social structure. The current international society is experiencing a profound reorganization and transition in values. All kinds of new interactions under the context of globalization have resulted in the development of the current norms of international human rights, which are constructed on the basis of law and ethics. Therefore, analyzing the dynamic factors of socialization that support the operation of human rights norms in international society has become increasingly important in today＇s mutually dependent society.展开更多
4.Fully leveraging the leading role of economic structural reform to build a high-standard socialist market economy Focusing on the building of a unified national market,we will make every effort to remove institution...4.Fully leveraging the leading role of economic structural reform to build a high-standard socialist market economy Focusing on the building of a unified national market,we will make every effort to remove institutional obstacles in order to spur the internal driving forces and in novation vitality of our society.1)We will further advance the building of a unified national market.展开更多
基金Supported by Major Projects in Aviation Engines and Gas Turbines(Grant No.J2019-IV-0001-0068).
文摘Space exploration has become a major focus in the field of technology,with gear transmissions in aerospace equipment playing a crucial role.In the extreme environment of space,gear transmissions face challenges like large temperature differentials,deformation and maintenance difficulties,which will severely impact transmission accuracy and service life.To meet the growing demands for high-performance gear transmissions with high transmission efficiency and error adaptability in the aerospace field,this paper proposes a novel curve-surface conjugate internal gear drive consisting of an involute internal gear and a curve-surface gear.The fundamental theory of curve-surface conjugation is introduced,and the construction method for curve-surface gear based on a selected contact path and meshing tube is presented.The analysis models including induced curvature,sliding ratio and tooth contact analysis with errors(ETCA)are simulated to evaluate the meshing characteristics.Additionally,prototypes are manufactured and experimental setups are established to validate the transmission performance.These results indicate that as the rotational speed increases,the transmission efficiency of the curve-surface conjugate internal gear drive improves,which is contrary to the trend observed in involute gear drives.And the transmission efficiency of the curve-surface conjugate internal gear drive surpasses that of the involute gear drive at higher rotational speeds.Moreover,this novel gear drive exhibits excellent error adaptability,maintaining intact contact paths and high transmission efficiency even in the presence of assembly errors.This study provides new ideas for the design and manufacture of high-performance gear transmissions from the perspective of spatial geometric elements.
文摘In order to sustain and increase students＇ interest in learning English, we tried to design several motivational approaches based on teaching psychology and pedagogy so as to improve our English teaching. The three orientations were identified to be the principles for the study： 1.Inspiration out of tracing the retrogression to its source; 2.Stimulating learning through integrative internal and external drives; 3.Providing chances to get more inspiration of creativity. The study of integrative motivation was made for two years, which turned out to be efficacious in our English teaching when it was finished.
文摘Autonomous learning emphasizes that students are the masters of learning and learning is the independent behavior of students, but it needs the help of teachers and parents. In educational activities, only by actively enabling students to become knowledge seekers, allowing them to actively study and use in an innovative spirit, and by acquiring knowledge to improve their learning ability and innovation awareness, can students' subjective initiative be brought into full play, positive research and development be promoted, and positive self-efficacy be created. Then, how should we achieve the ideal state of letting students study independently? The following is a study on this.
文摘Human rights, as a great term and lofty goal, have unquestionably become a topic of mainstream talk in the present-day world.2 Such mainstream talk has been internal- ized into part of the social structure. The current international society is experiencing a profound reorganization and transition in values. All kinds of new interactions under the context of globalization have resulted in the development of the current norms of international human rights, which are constructed on the basis of law and ethics. Therefore, analyzing the dynamic factors of socialization that support the operation of human rights norms in international society has become increasingly important in today＇s mutually dependent society.
文摘4.Fully leveraging the leading role of economic structural reform to build a high-standard socialist market economy Focusing on the building of a unified national market,we will make every effort to remove institutional obstacles in order to spur the internal driving forces and in novation vitality of our society.1)We will further advance the building of a unified national market.
