Cold orbital forging is an advanced spur bevel gear forming technology. Generally, the spur bevel gear in the cold orbital forging process is formed by two steps: the preforming step and the final step. Due to the gre...Cold orbital forging is an advanced spur bevel gear forming technology. Generally, the spur bevel gear in the cold orbital forging process is formed by two steps: the preforming step and the final step. Due to the great importance of the final step to gear forming and its complication with interactive factors, this work aims at examining the influence of key factors on the final step in cold orbital forging of a spur bevel gear. Using the finite element(FE) method and control variate method, the influence rules of four key factors, rotation velocity of the upper tool, n, feeding velocity of the lower tool, v, tilted angle of the upper tool, γ, friction factor between the tools and the billet, m, on the geometry and the deformation inhomogeneity of the cold orbital forged gear are thoroughly clarified. The research results show that the flash becomes more homogeneous with increasing v, increasing m, decreasing n or decreasing γ. And the deformation of the gear becomes more homogeneous with increasing v, decreasing n or decreasing γ. Finally, a corresponding experiment is conducted, which verifies the accuracy of FE simulation conclusions.展开更多
The purpose of this paper is to analyze the reception of Wagner＇s approaches to Greek antiquity by Greek musicologists and composers which took place at the first half of the 20th century. Wagner＇s such readings wer...The purpose of this paper is to analyze the reception of Wagner＇s approaches to Greek antiquity by Greek musicologists and composers which took place at the first half of the 20th century. Wagner＇s such readings were parts of wider narrations of archeology and how Greeks perceived their past.This research is largely based on primary sources of that time; its arguments construct two levels of critique： （1） Admiration （the ＇proper＇ aesthetic examples are German models, as exemplified in Wagner＇s work）; and （2） ＂Hellenism＂ as a means to distancing from Wagner （The past of ancient Greece is still believed to be better understood by the Greeks）. The principal conclusions are： （1） Wagner＇s views were admired because Wagner＇s example （ancient culture） should also be an example for Greek composers; and （2） Wagner＇s views were judged on the grounds of： Ideology： the expression of the ＂soul＂; the theory of ＂historic continuity＂; the balance between music, poetry, and dance; Wagner gave superiority to music, modem Greeks （should） give a predominant role to language as a means of expression in an ancient drama, or achieve a balance among the three arts of music, poetry, and dance.展开更多
基金Project(51105287)supported by the National Natural Science Foundation of ChinaProject(IRT13087)supported by Innovative Research Team Development Program of Ministry of Education of China+2 种基金Project(2012-86)supported by High-End Talent Leading Program of Hubei Province,ChinaProject(2014CFB876)supported by Natural Science Foundation of Hubei ProvinceChina
文摘Cold orbital forging is an advanced spur bevel gear forming technology. Generally, the spur bevel gear in the cold orbital forging process is formed by two steps: the preforming step and the final step. Due to the great importance of the final step to gear forming and its complication with interactive factors, this work aims at examining the influence of key factors on the final step in cold orbital forging of a spur bevel gear. Using the finite element(FE) method and control variate method, the influence rules of four key factors, rotation velocity of the upper tool, n, feeding velocity of the lower tool, v, tilted angle of the upper tool, γ, friction factor between the tools and the billet, m, on the geometry and the deformation inhomogeneity of the cold orbital forged gear are thoroughly clarified. The research results show that the flash becomes more homogeneous with increasing v, increasing m, decreasing n or decreasing γ. And the deformation of the gear becomes more homogeneous with increasing v, decreasing n or decreasing γ. Finally, a corresponding experiment is conducted, which verifies the accuracy of FE simulation conclusions.
文摘The purpose of this paper is to analyze the reception of Wagner＇s approaches to Greek antiquity by Greek musicologists and composers which took place at the first half of the 20th century. Wagner＇s such readings were parts of wider narrations of archeology and how Greeks perceived their past.This research is largely based on primary sources of that time; its arguments construct two levels of critique： （1） Admiration （the ＇proper＇ aesthetic examples are German models, as exemplified in Wagner＇s work）; and （2） ＂Hellenism＂ as a means to distancing from Wagner （The past of ancient Greece is still believed to be better understood by the Greeks）. The principal conclusions are： （1） Wagner＇s views were admired because Wagner＇s example （ancient culture） should also be an example for Greek composers; and （2） Wagner＇s views were judged on the grounds of： Ideology： the expression of the ＂soul＂; the theory of ＂historic continuity＂; the balance between music, poetry, and dance; Wagner gave superiority to music, modem Greeks （should） give a predominant role to language as a means of expression in an ancient drama, or achieve a balance among the three arts of music, poetry, and dance.
