A kind of networked control system is studied; the networked control system with noise disturbance is modeled based on information scheduling and control co-design. Augmented state matrix analysis method is introduced...A kind of networked control system is studied; the networked control system with noise disturbance is modeled based on information scheduling and control co-design. Augmented state matrix analysis method is introduced, and robust fault-tolerant control problem of networked control systems with noise disturbance under actuator failures is studied. The parametric expression of the controller under actuator failures is given. Furthermore, the result is analyzed by simulation tests, which not only satisfies the networked control systems stability, but also decreases the data information number in network channel and makes full use of the network resources.展开更多
It is proved that the calculation precision of the outside flow field of the van-body truck using PNG k-Ε turbulence model is higher than that using standard k-Ε turbulence model by means of experiments. The calcula...It is proved that the calculation precision of the outside flow field of the van-body truck using PNG k-Ε turbulence model is higher than that using standard k-Ε turbulence model by means of experiments. The calculation results of the outside flow field of a certain domestic van-body truck are given. And by analyzing and comparing the different tail flow plots, the tail flow structural characteristics and the relationship between the position and the intensity of the tail vortex and the aerodynamic drag is obtained, which can direct the design of the outside aerodynamic shape of the van-body truck.展开更多
The flow in funnel chamber is typical three-dimensional flow. The experimental results of clear water flow field and muddy water flow field show that the flow characteristics in the funnel chamber are favorable to the...The flow in funnel chamber is typical three-dimensional flow. The experimental results of clear water flow field and muddy water flow field show that the flow characteristics in the funnel chamber are favorable to the separation of water and sand. Tangential velocity sustains the vortex strength of the funnel chamber, axial velocity is benefit to the sediment sinking, and radial velocity is benefit to sediment moving to desilting hole. So the sand funnel is successful in sediment disposal. The sand funnel projection has also good desilting effectiveness in practice. Its average flushing discharge is 3% of inlet canal discharge, the sand disposal rate is 100% for the sand with grain diameter of more than 0.5 mm, and is more than 90% for the sand with grain diameter of less than 0.5 mm.展开更多
The algorithm of the Hybrid Finite Analytic Method (HFAM) was used to simulate the fully developed turbulent flows in non-circular ducts and open channels. The turbulent flow fields in a square duct and a rectangular ...The algorithm of the Hybrid Finite Analytic Method (HFAM) was used to simulate the fully developed turbulent flows in non-circular ducts and open channels. The turbulent flow fields in a square duct and a rectangular open channels were calculated by the Naot and Rodi's model, and that in a compound channel was calculated by Speaizle's non-linear eddy-viscosity model with this algorithm. The results show that the HFAM is suitable for calculating these complicated turbulent flows.展开更多
基金Hohai University Startup Outlay for Doctor Scientific Research (2084/40601136)
文摘A kind of networked control system is studied; the networked control system with noise disturbance is modeled based on information scheduling and control co-design. Augmented state matrix analysis method is introduced, and robust fault-tolerant control problem of networked control systems with noise disturbance under actuator failures is studied. The parametric expression of the controller under actuator failures is given. Furthermore, the result is analyzed by simulation tests, which not only satisfies the networked control systems stability, but also decreases the data information number in network channel and makes full use of the network resources.
文摘It is proved that the calculation precision of the outside flow field of the van-body truck using PNG k-Ε turbulence model is higher than that using standard k-Ε turbulence model by means of experiments. The calculation results of the outside flow field of a certain domestic van-body truck are given. And by analyzing and comparing the different tail flow plots, the tail flow structural characteristics and the relationship between the position and the intensity of the tail vortex and the aerodynamic drag is obtained, which can direct the design of the outside aerodynamic shape of the van-body truck.
文摘The flow in funnel chamber is typical three-dimensional flow. The experimental results of clear water flow field and muddy water flow field show that the flow characteristics in the funnel chamber are favorable to the separation of water and sand. Tangential velocity sustains the vortex strength of the funnel chamber, axial velocity is benefit to the sediment sinking, and radial velocity is benefit to sediment moving to desilting hole. So the sand funnel is successful in sediment disposal. The sand funnel projection has also good desilting effectiveness in practice. Its average flushing discharge is 3% of inlet canal discharge, the sand disposal rate is 100% for the sand with grain diameter of more than 0.5 mm, and is more than 90% for the sand with grain diameter of less than 0.5 mm.
文摘The algorithm of the Hybrid Finite Analytic Method (HFAM) was used to simulate the fully developed turbulent flows in non-circular ducts and open channels. The turbulent flow fields in a square duct and a rectangular open channels were calculated by the Naot and Rodi's model, and that in a compound channel was calculated by Speaizle's non-linear eddy-viscosity model with this algorithm. The results show that the HFAM is suitable for calculating these complicated turbulent flows.
