The design,modeling,and simulation of a micro electrical switch for fuze are presented.It consists of springemass system with zigzag slot in mass,latching and electrical connection mechanism and movement-limit mechani...The design,modeling,and simulation of a micro electrical switch for fuze are presented.It consists of springemass system with zigzag slot in mass,latching and electrical connection mechanism and movement-limit mechanism.The switch keeps off-state until it is subjected to an acceleration when fuze is launched normally.The acceleration is simulated as half-sine pulse with specific amplitude and duration.The dynamics model of the switch is studied.Based on zigzag slot in mass,the methods used for recognizing acceleration load are established and analyzed according to the dynamics theory.Two typical half-sine accelerations are loaded on the switch in simulation.The simulation results are in accordance with those of theoretical analysis.The inertial response characteristics of the switch can ensure that the fuze power supply and circuit are connected safely and reliably.展开更多
Heat exchange performance of vertical U-tube heat exchanger was studied with two different borehole fill materials and CFD software. Borehole surface temperature and water temperature distribution were simulated on th...Heat exchange performance of vertical U-tube heat exchanger was studied with two different borehole fill materials and CFD software. Borehole surface temperature and water temperature distribution were simulated on the condition of continuous operation for 8 h in winter with inlet water temperature being 10℃. The results show that there is no obvious difference on heat exchanger performance between the two different borehole fill materials.展开更多
文摘The design,modeling,and simulation of a micro electrical switch for fuze are presented.It consists of springemass system with zigzag slot in mass,latching and electrical connection mechanism and movement-limit mechanism.The switch keeps off-state until it is subjected to an acceleration when fuze is launched normally.The acceleration is simulated as half-sine pulse with specific amplitude and duration.The dynamics model of the switch is studied.Based on zigzag slot in mass,the methods used for recognizing acceleration load are established and analyzed according to the dynamics theory.Two typical half-sine accelerations are loaded on the switch in simulation.The simulation results are in accordance with those of theoretical analysis.The inertial response characteristics of the switch can ensure that the fuze power supply and circuit are connected safely and reliably.
基金Project(CSTC 2004AA7008 2 2) supported by Key Technologies for Development of Small Cities of ChongqingMunicipality
文摘Heat exchange performance of vertical U-tube heat exchanger was studied with two different borehole fill materials and CFD software. Borehole surface temperature and water temperature distribution were simulated on the condition of continuous operation for 8 h in winter with inlet water temperature being 10℃. The results show that there is no obvious difference on heat exchanger performance between the two different borehole fill materials.
