The ultrasonic assisted GMAW （U-GMAW） method is proposed to achieve a more stable welding process and better weld quality. Tbe U-GMA W system is dereloped, which consists of power supplies, ultrasonic vibration syst...The ultrasonic assisted GMAW （U-GMAW） method is proposed to achieve a more stable welding process and better weld quality. Tbe U-GMA W system is dereloped, which consists of power supplies, ultrasonic vibration system and specially designed u＇elding torch. The U-GMA W process and eonventional GMA W process are compared through bead-on-plate welding. The weld beads arc continuous and well protected, while the weld surface appearances by GMA W and U-GMA W are apparently diffierent. The metal transfe ,node changes from globular transfer to short-circuiting transfer after ultrasonic wave is applied onto the arc.展开更多
A projectile with exotic wraparound wings( WAW) configuration is designed to improve the finstabilized projectile shooting quality. Two fin-stabilized projectiles with the same body with and without exotic WAW configu...A projectile with exotic wraparound wings( WAW) configuration is designed to improve the finstabilized projectile shooting quality. Two fin-stabilized projectiles with the same body with and without exotic WAW configuration are simulated numerically by applying the Roe scheme. The shear-stress transport turbulence models and the lower-upper symmetric Gauss-Seidel implicit method are used to solve 3D Reynoldsaveraged Navier—Stokes equations. The differences in aerodynamic coefficients and aerodynamic characteristics of the projectiles when the Mach number varies from 0. 35 to 0. 95 are obtained,and the cause of these differences is analyzed. The calculation results indicate that the lift-to-drag ratio of the projectile significantly increases,the rolling moment decreases,and the position of the pressure center of the projectile shows relatively small changes when the exotic WAW configuration is used. Therefore,this projectile can obviously reduce rolling effect,enlarge range and improve flying stability.展开更多
The performance of scalable shared-memory multiprocessors suffers from three types of latency; memory latency, the latency caused by inter-process synchronization ,and the latency caused by instructions that take mult...The performance of scalable shared-memory multiprocessors suffers from three types of latency; memory latency, the latency caused by inter-process synchronization ,and the latency caused by instructions that take multiple cycles to produce results To tolerate these three types of latencies, The following techniques was proposed to couple: coarse-grained multithreading, the superscalar processor and a reconfigurable device, namely the overlapping long latency operations of one thread of computation with the execution of other threads The superscalar processor principle is used to tolerate instruction latency by issuing several instructions simultaneously The DPGA is coupled with this processor in order to improve the context-switching展开更多
文摘The ultrasonic assisted GMAW （U-GMAW） method is proposed to achieve a more stable welding process and better weld quality. Tbe U-GMA W system is dereloped, which consists of power supplies, ultrasonic vibration system and specially designed u＇elding torch. The U-GMA W process and eonventional GMA W process are compared through bead-on-plate welding. The weld beads arc continuous and well protected, while the weld surface appearances by GMA W and U-GMA W are apparently diffierent. The metal transfe ,node changes from globular transfer to short-circuiting transfer after ultrasonic wave is applied onto the arc.
基金Sponsored by the National Natural Science Foundation of China(Grant No.51076066)
文摘A projectile with exotic wraparound wings( WAW) configuration is designed to improve the finstabilized projectile shooting quality. Two fin-stabilized projectiles with the same body with and without exotic WAW configuration are simulated numerically by applying the Roe scheme. The shear-stress transport turbulence models and the lower-upper symmetric Gauss-Seidel implicit method are used to solve 3D Reynoldsaveraged Navier—Stokes equations. The differences in aerodynamic coefficients and aerodynamic characteristics of the projectiles when the Mach number varies from 0. 35 to 0. 95 are obtained,and the cause of these differences is analyzed. The calculation results indicate that the lift-to-drag ratio of the projectile significantly increases,the rolling moment decreases,and the position of the pressure center of the projectile shows relatively small changes when the exotic WAW configuration is used. Therefore,this projectile can obviously reduce rolling effect,enlarge range and improve flying stability.
文摘The performance of scalable shared-memory multiprocessors suffers from three types of latency; memory latency, the latency caused by inter-process synchronization ,and the latency caused by instructions that take multiple cycles to produce results To tolerate these three types of latencies, The following techniques was proposed to couple: coarse-grained multithreading, the superscalar processor and a reconfigurable device, namely the overlapping long latency operations of one thread of computation with the execution of other threads The superscalar processor principle is used to tolerate instruction latency by issuing several instructions simultaneously The DPGA is coupled with this processor in order to improve the context-switching
