Using the effective matrix methods of flatness and profile control synthetically,the flatness and profile in-tegration control scheme for tandem cold mills is built in order to increase flatness and profile control pr...Using the effective matrix methods of flatness and profile control synthetically,the flatness and profile in-tegration control scheme for tandem cold mills is built in order to increase flatness and profile control precision of tan-dem cold mills.Corresponding control strategies are adopted for various control objectives of different stands and the coordination control strategies of various stands are given,which makes the on-line flatness control cooperate with on-line profile control and implements the parallel control of different stands.According to the measured flatness and profile data of some 1550 mm tandem cold mills,the control scheme is verified and the result indicates that the scheme has high flatness and profile control precision with steady and reliable control process.A new way and method is supplied for researching shade control of tandem cold mills.展开更多
With the increasing construction of artificial beach in coastal areas, it is of practical significance to study the beach surface deformation of artificial beach profile. Previous studies only focus on a single wave d...With the increasing construction of artificial beach in coastal areas, it is of practical significance to study the beach surface deformation of artificial beach profile. Previous studies only focus on a single wave dynamic factor, and it is difficult to predict the beach deformation of artificial beach profile under the storm surge-wave co-action. To solve this problem, the cross-section physical model test method was used to study the beach surface deformation of a typical artificial beach profile in Shuangdao Bay, Weihai, Shandong Province, after continuous wave actions till they stabilize. The characteristics of beach surface deformation under the conditions of constant water levels, laddershaped water level combined with corresponding wave elements and storm surge-wave co-action are compared and analyzed. A beach profile model which satisfies the theory of Bruun model is proposed. The test results show that the maximum scour depth of beach under storm surge-wave co-action is smaller and the scour range is obviously larger than that under the condition of constant water levels or ladder-shaped water level. The evaluation of the maximum scour depth by traditional model test tends to be conservative while the evaluation of the scour range is insufficient.The research results can provide scientific reference for designing artificial beaches.展开更多
In this paper two-dimensional differential quadrature method has been used to analyze thick Functionally Graded(FG)rotating disks with non-uniform boundary conditions and variable thickness.Material properties vary co...In this paper two-dimensional differential quadrature method has been used to analyze thick Functionally Graded(FG)rotating disks with non-uniform boundary conditions and variable thickness.Material properties vary continuously along both radial and axial directions by a power law pattern.Three-dimensional solid mechanics theory is employed to formulate the axisymmetric problem as a second order system of partial differential equations.The non-uniform boundary conditions are exerted directly into the governing equations to reach the eigenvalue system of equations.Four different disk profile shapes are considered and discussed.The effect of the power law exponent is also investigated and results show that by the use of material which functionally varied along the radial and especially axial directions the stresses and strains can be controlled so the capability of the disk is increased.Comparison with other available approaches in the literature shows a good agreement here in terms of computational time,robustness and accuracy of the present method.Moreover,novel applications are shown to provide results for further studies on the same topics.展开更多
基金Sponsored by National High-Tech Research and Development Project of China(2009AA04Z143)Hebei Provincial Great Natural Science Foundation of China(E2006001038)Hebei Provincial Science and Technology Project of China(10212101D)
文摘Using the effective matrix methods of flatness and profile control synthetically,the flatness and profile in-tegration control scheme for tandem cold mills is built in order to increase flatness and profile control precision of tan-dem cold mills.Corresponding control strategies are adopted for various control objectives of different stands and the coordination control strategies of various stands are given,which makes the on-line flatness control cooperate with on-line profile control and implements the parallel control of different stands.According to the measured flatness and profile data of some 1550 mm tandem cold mills,the control scheme is verified and the result indicates that the scheme has high flatness and profile control precision with steady and reliable control process.A new way and method is supplied for researching shade control of tandem cold mills.
基金financially supported by the NSFC-Shandong Joint Fund (Grant No. U1706216)the Major Project of Nanjing Hydraulic Research Institute Funds (Grand Nos. Y220002, Y220013 and Y221017)+1 种基金the Water Conservancy Science and Technology Project of Jiangsu Province(Grant No. 2019009)the Water Conservancy Planning Project of Jiangsu Province (Grant No. GHB-HT-202100)
文摘With the increasing construction of artificial beach in coastal areas, it is of practical significance to study the beach surface deformation of artificial beach profile. Previous studies only focus on a single wave dynamic factor, and it is difficult to predict the beach deformation of artificial beach profile under the storm surge-wave co-action. To solve this problem, the cross-section physical model test method was used to study the beach surface deformation of a typical artificial beach profile in Shuangdao Bay, Weihai, Shandong Province, after continuous wave actions till they stabilize. The characteristics of beach surface deformation under the conditions of constant water levels, laddershaped water level combined with corresponding wave elements and storm surge-wave co-action are compared and analyzed. A beach profile model which satisfies the theory of Bruun model is proposed. The test results show that the maximum scour depth of beach under storm surge-wave co-action is smaller and the scour range is obviously larger than that under the condition of constant water levels or ladder-shaped water level. The evaluation of the maximum scour depth by traditional model test tends to be conservative while the evaluation of the scour range is insufficient.The research results can provide scientific reference for designing artificial beaches.
文摘In this paper two-dimensional differential quadrature method has been used to analyze thick Functionally Graded(FG)rotating disks with non-uniform boundary conditions and variable thickness.Material properties vary continuously along both radial and axial directions by a power law pattern.Three-dimensional solid mechanics theory is employed to formulate the axisymmetric problem as a second order system of partial differential equations.The non-uniform boundary conditions are exerted directly into the governing equations to reach the eigenvalue system of equations.Four different disk profile shapes are considered and discussed.The effect of the power law exponent is also investigated and results show that by the use of material which functionally varied along the radial and especially axial directions the stresses and strains can be controlled so the capability of the disk is increased.Comparison with other available approaches in the literature shows a good agreement here in terms of computational time,robustness and accuracy of the present method.Moreover,novel applications are shown to provide results for further studies on the same topics.
