The structure and working principle of a hydraulic buffering valve for a power-shift transmission ZF-4WG308 were studied comprehensively, and a model of the hydraulic buffering valve was developed with AMESim. A bench...The structure and working principle of a hydraulic buffering valve for a power-shift transmission ZF-4WG308 were studied comprehensively, and a model of the hydraulic buffering valve was developed with AMESim. A bench test was conducted on a buffering valve for transmissions(ZF-4WG308) and the test results agree well with the simulated results. Further more, the influences of the key parameters of the valve on the buffering performance were also studied in details.展开更多
Calcium fluoride is widely used in optical lithography lenses and causes retardation that cannot be ignored.However,few studies have been conducted to compensate for the retardation caused by calcium fluoride in optic...Calcium fluoride is widely used in optical lithography lenses and causes retardation that cannot be ignored.However,few studies have been conducted to compensate for the retardation caused by calcium fluoride in optical lithography systems.In this Letter,a new index based on orientation Zernike polynomials is established to describe the value of retardation.Then,a method of retardation compensation is described.The method is implemented by clocking calcium fluoride lens elements,and the optimal rotation angles are calculated using a population-based stochastic optimization algorithm.Finally,an example is provided to validate the method.展开更多
基金Project(51077096)supported by the National Natural Science Foundation of ChinaProject(2012940-15-3)supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry
文摘The structure and working principle of a hydraulic buffering valve for a power-shift transmission ZF-4WG308 were studied comprehensively, and a model of the hydraulic buffering valve was developed with AMESim. A bench test was conducted on a buffering valve for transmissions(ZF-4WG308) and the test results agree well with the simulated results. Further more, the influences of the key parameters of the valve on the buffering performance were also studied in details.
文摘Calcium fluoride is widely used in optical lithography lenses and causes retardation that cannot be ignored.However,few studies have been conducted to compensate for the retardation caused by calcium fluoride in optical lithography systems.In this Letter,a new index based on orientation Zernike polynomials is established to describe the value of retardation.Then,a method of retardation compensation is described.The method is implemented by clocking calcium fluoride lens elements,and the optimal rotation angles are calculated using a population-based stochastic optimization algorithm.Finally,an example is provided to validate the method.
