The task of achieving high-accuracy full-field reconstruction in the realm of water waves is widely acknowledged as a challenge,primarily due to the sparsity and incompleteness of data measurement in both temporal and...The task of achieving high-accuracy full-field reconstruction in the realm of water waves is widely acknowledged as a challenge,primarily due to the sparsity and incompleteness of data measurement in both temporal and spatial dimensions.We develop a full-field velocity and pressure reconstruction approach for non-linear water waves based on physics-informed neural networks from the free surface measurement.The fully non-linear highly dispersive Boussinesq model is integrated to reduce the training cost by representing the three dimensional water wave problems in the horizontal two-dimensional plane with the inherent veloc-ity distribution along water depth.A series of test cases,including the solitary waves,fifth-order Stokes waves,standing waves,and superimposed waves,are employed to evaluate the performance of the algorithm.The proposed novel neural networks are capable of accurately reconstructing the flow fields even when assimilating the limited and sparse free surface deformation data,which facilitates the development of detecting the flow characteristics in real ocean waves.展开更多
以码垛机器人虚拟样机作为研究对象,分析机器人在静态下的受力情况,运用Solid W orks的sim ulation模块对机器人进行静力学分析。在此基础上,校核和优化设计机器人的机构,使机器人在满足结构强度和刚度的前提下,能够减轻整体的重量,降...以码垛机器人虚拟样机作为研究对象,分析机器人在静态下的受力情况,运用Solid W orks的sim ulation模块对机器人进行静力学分析。在此基础上,校核和优化设计机器人的机构,使机器人在满足结构强度和刚度的前提下,能够减轻整体的重量,降低生产成本。展开更多
通过在三维制图软件Solid W orks中对担架梯轿架进行实体建模,并运用有限元分析软件A N SY S对轿架的结构模型进行偏载工况下刚度和强度的静力学性能分析,在有限元分析结果的基础上对轿架模型提出更改建议,改进后的轿架结构满足担架梯...通过在三维制图软件Solid W orks中对担架梯轿架进行实体建模,并运用有限元分析软件A N SY S对轿架的结构模型进行偏载工况下刚度和强度的静力学性能分析,在有限元分析结果的基础上对轿架模型提出更改建议,改进后的轿架结构满足担架梯设计要求。展开更多
According to the phenomenon of "four more"and"four low "problems in the observation stations,the surface-based meteorological observing system can't adapt to the change of the adaptive observat...According to the phenomenon of "four more"and"four low "problems in the observation stations,the surface-based meteorological observing system can't adapt to the change of the adaptive observation equipment and reduce of business intensification. A station integrated system is proposed,w hich can be configured,connected and extended to all kinds of observation equipment. And the integrated processor is designed,supporting a variety of communication interface standards. Flexible configuration,connection and expansion betw een conventional and new type of meteorological observation equipment are supported. It is capable for online calibration and maintenance of observation equipment. The effectiveness of automatic observation equipment is totally achieved to provide basic information support for disaster prevention and mitigation and national economic development.展开更多
A genetic neural net work m odel about design of Mg content in the alloy , based on tested databetw een Mg and tensile intensity or elongation in Zn 27 % Al alloy , has been established . Theresult has sho w n th...A genetic neural net work m odel about design of Mg content in the alloy , based on tested databetw een Mg and tensile intensity or elongation in Zn 27 % Al alloy , has been established . Theresult has sho w n that the genetic neural netw ork is a better an d m ore applied method for m a terials design than the regress analysis .展开更多
The article describes the layered model of physical network and information security,and the establishment of the mobile Internet’s security framework based on its network architecture.The mobile Internet has three p...The article describes the layered model of physical network and information security,and the establishment of the mobile Internet’s security framework based on its network architecture.The mobile Internet has three parts,i.e.terminal,network and service system,each of which can be studied in four layers of the network and information security,namely,the equipment/environment security layer,the service and application security layer,the information security layer and the information content security layer.展开更多
For precise composition control and the selection of hot-w orking operation,effects of carbon（ C）,sulphur（ S）,phosphorus（ P）,and nickel（ Ni） compositions and hot working on thermal fatigue properties of H13 st...For precise composition control and the selection of hot-w orking operation,effects of carbon（ C）,sulphur（ S）,phosphorus（ P）,and nickel（ Ni） compositions and hot working on thermal fatigue properties of H13 steel under thermal cycling conditions w ere studied by a self-restraint thermal fatigue test. Results show ed that the control of the C content at about 0. 35%,Ni content at about 0. 50%,and S and P contents as low as possible and the forging operation used lead to an improvement of the thermal fatigue resistance of the steel.展开更多
基金supported by the Narional Nanre Science Foundarion of China(Grand Nos 12202272 and U22B6010)。
文摘The task of achieving high-accuracy full-field reconstruction in the realm of water waves is widely acknowledged as a challenge,primarily due to the sparsity and incompleteness of data measurement in both temporal and spatial dimensions.We develop a full-field velocity and pressure reconstruction approach for non-linear water waves based on physics-informed neural networks from the free surface measurement.The fully non-linear highly dispersive Boussinesq model is integrated to reduce the training cost by representing the three dimensional water wave problems in the horizontal two-dimensional plane with the inherent veloc-ity distribution along water depth.A series of test cases,including the solitary waves,fifth-order Stokes waves,standing waves,and superimposed waves,are employed to evaluate the performance of the algorithm.The proposed novel neural networks are capable of accurately reconstructing the flow fields even when assimilating the limited and sparse free surface deformation data,which facilitates the development of detecting the flow characteristics in real ocean waves.
基金supported by Meteorological Industry Research Projects ( 2013 ) : Development and Application of Key Integration Technologies for Surface-based Meteorological Observation
文摘According to the phenomenon of "four more"and"four low "problems in the observation stations,the surface-based meteorological observing system can't adapt to the change of the adaptive observation equipment and reduce of business intensification. A station integrated system is proposed,w hich can be configured,connected and extended to all kinds of observation equipment. And the integrated processor is designed,supporting a variety of communication interface standards. Flexible configuration,connection and expansion betw een conventional and new type of meteorological observation equipment are supported. It is capable for online calibration and maintenance of observation equipment. The effectiveness of automatic observation equipment is totally achieved to provide basic information support for disaster prevention and mitigation and national economic development.
文摘A genetic neural net work m odel about design of Mg content in the alloy , based on tested databetw een Mg and tensile intensity or elongation in Zn 27 % Al alloy , has been established . Theresult has sho w n that the genetic neural netw ork is a better an d m ore applied method for m a terials design than the regress analysis .
基金supported by the National HighTechnology Research and Development Programof China("863"Program)under Grant No.2008AA01A204
文摘The article describes the layered model of physical network and information security,and the establishment of the mobile Internet’s security framework based on its network architecture.The mobile Internet has three parts,i.e.terminal,network and service system,each of which can be studied in four layers of the network and information security,namely,the equipment/environment security layer,the service and application security layer,the information security layer and the information content security layer.
文摘For precise composition control and the selection of hot-w orking operation,effects of carbon（ C）,sulphur（ S）,phosphorus（ P）,and nickel（ Ni） compositions and hot working on thermal fatigue properties of H13 steel under thermal cycling conditions w ere studied by a self-restraint thermal fatigue test. Results show ed that the control of the C content at about 0. 35%,Ni content at about 0. 50%,and S and P contents as low as possible and the forging operation used lead to an improvement of the thermal fatigue resistance of the steel.
