Dynamic parameters of hollow spindle are identified and sensitivities to mass and stiffness are calculated by using modal analysis based on CRAS system. A method of adjusting resonance frequency is also presented. All...Dynamic parameters of hollow spindle are identified and sensitivities to mass and stiffness are calculated by using modal analysis based on CRAS system. A method of adjusting resonance frequency is also presented. All of the work is useful for optimizing design hollow spindle.展开更多
A system model is established to analyze the dynamic performance of an integrated starter and generator （ISG） hybrid power shafting. The model couples the electromechanical coupling shaft dynamics, the bearing hydro...A system model is established to analyze the dynamic performance of an integrated starter and generator （ISG） hybrid power shafting. The model couples the electromechanical coupling shaft dynamics, the bearing hydrodynamic lubrication and the engine block stiffness. The model is com- pared with the model based on ADAMS or the model neglecting the bearing hydrodynamics. The bearing eccentricity and the oil film pressure have been calculated under different hybrid conditions or at the different motor power levels. It＇ s found that the bearing hydrodynamics decreases the cal- culation results of the bearing peak load. Changes of the hybrid conditions or the motor power have no significant effect on the main bearing, but have impact on the motor bearing. A hybrid power sys- tem composed of a 1.6 L engine and a 45 kW ISG motor can operate safely.展开更多
Coarse-graining of some sort is a fundamental and unavoidable step in any attempt to derive the classical mechan- ical behavior from the quantum formalism. We utilize the two-mode Bose-Hubbard model to illustrate how ...Coarse-graining of some sort is a fundamental and unavoidable step in any attempt to derive the classical mechan- ical behavior from the quantum formalism. We utilize the two-mode Bose-Hubbard model to illustrate how different coarse-grained systems can be naturally associated with a fixed quantum system if it is compatible with different dy- namical algebras. Alternative coarse-grained systems generate different evolutions of the same physical quantities, and the difference becomes negligible only in the appropriate macro-limit.展开更多
文摘Dynamic parameters of hollow spindle are identified and sensitivities to mass and stiffness are calculated by using modal analysis based on CRAS system. A method of adjusting resonance frequency is also presented. All of the work is useful for optimizing design hollow spindle.
基金Supported by the National Natural Science Foundation of China( 51105032)
文摘A system model is established to analyze the dynamic performance of an integrated starter and generator （ISG） hybrid power shafting. The model couples the electromechanical coupling shaft dynamics, the bearing hydrodynamic lubrication and the engine block stiffness. The model is com- pared with the model based on ADAMS or the model neglecting the bearing hydrodynamics. The bearing eccentricity and the oil film pressure have been calculated under different hybrid conditions or at the different motor power levels. It＇ s found that the bearing hydrodynamics decreases the cal- culation results of the bearing peak load. Changes of the hybrid conditions or the motor power have no significant effect on the main bearing, but have impact on the motor bearing. A hybrid power sys- tem composed of a 1.6 L engine and a 45 kW ISG motor can operate safely.
基金Project supported by the Ministry of Education and Science of the Republic of Serbia(Grant Nos.171017,171028,171038,and III45016)We would like to acknowledge partial support by COST(Action MP1006)
文摘Coarse-graining of some sort is a fundamental and unavoidable step in any attempt to derive the classical mechan- ical behavior from the quantum formalism. We utilize the two-mode Bose-Hubbard model to illustrate how different coarse-grained systems can be naturally associated with a fixed quantum system if it is compatible with different dy- namical algebras. Alternative coarse-grained systems generate different evolutions of the same physical quantities, and the difference becomes negligible only in the appropriate macro-limit.
