The dynamic transmission characteristics and the sensitivities of the three stage idler gear system of the new NC power turret are studied in the paper. Considering the strongly nonlinear factors such as the periodica...The dynamic transmission characteristics and the sensitivities of the three stage idler gear system of the new NC power turret are studied in the paper. Considering the strongly nonlinear factors such as the periodically time-varying mesh stiffness, the nonlinear tooth backlash, the lump-parameter model of the gear system is developed with one rotational and two translational freedoms of each gear. The eigen-values and eigenvectors are derived and analyzed on the basis of the real modal theory. The sensitivities of natural frequencies to design parameters including supporting and meshing stiffnesses, gear masses, and moments of inertia by the direct differential method are also calculated. The results show the quantitative and qualitative impact of the parameters to the natural characteristics of the gear system. Furthermore, the periodic steady state solutions are obtained by the numerical approach based on the nonlinear model. These results are employed to gain insights into the primary controlling parameters, to forecast the severity of the dynamic response, and to assess the acceptability of the gear design.展开更多
Hawkshaw is the barber who makes defense for the black man Will Mayes in the Dry September and the one who married Susan in the Hair.He has been almost soundless when he was introduced in the Hair;his story was weaved...Hawkshaw is the barber who makes defense for the black man Will Mayes in the Dry September and the one who married Susan in the Hair.He has been almost soundless when he was introduced in the Hair;his story was weaved by the narrator and the other folks.His life was always in the gaze of other folks;according to Foucault,the gaze is the sight carrying power or desire.Under the look of the gazers,he paid on the dead ficancee’s family’s mortgage;he gave up defending for Will;he married Susan and he left Jefferson.His behaviors can be explained by the gazee’s submission and resistance.Therefore,this thesis aims to offer some visions on the image of Hawkshaw through the lens of Foucault’s theory.展开更多
文摘The dynamic transmission characteristics and the sensitivities of the three stage idler gear system of the new NC power turret are studied in the paper. Considering the strongly nonlinear factors such as the periodically time-varying mesh stiffness, the nonlinear tooth backlash, the lump-parameter model of the gear system is developed with one rotational and two translational freedoms of each gear. The eigen-values and eigenvectors are derived and analyzed on the basis of the real modal theory. The sensitivities of natural frequencies to design parameters including supporting and meshing stiffnesses, gear masses, and moments of inertia by the direct differential method are also calculated. The results show the quantitative and qualitative impact of the parameters to the natural characteristics of the gear system. Furthermore, the periodic steady state solutions are obtained by the numerical approach based on the nonlinear model. These results are employed to gain insights into the primary controlling parameters, to forecast the severity of the dynamic response, and to assess the acceptability of the gear design.
文摘Hawkshaw is the barber who makes defense for the black man Will Mayes in the Dry September and the one who married Susan in the Hair.He has been almost soundless when he was introduced in the Hair;his story was weaved by the narrator and the other folks.His life was always in the gaze of other folks;according to Foucault,the gaze is the sight carrying power or desire.Under the look of the gazers,he paid on the dead ficancee’s family’s mortgage;he gave up defending for Will;he married Susan and he left Jefferson.His behaviors can be explained by the gazee’s submission and resistance.Therefore,this thesis aims to offer some visions on the image of Hawkshaw through the lens of Foucault’s theory.
