从有线传输技术概述入手,阐述同步数字系列(Synchronous Digital Hierarchy,SDH)、多业务传送平台(Multi-Service Transmission Platform,MSTP)、分组传送网(Packet Transport Network,PTN)、自动交换光网络(Automatic Switch Optical N...从有线传输技术概述入手,阐述同步数字系列(Synchronous Digital Hierarchy,SDH)、多业务传送平台(Multi-Service Transmission Platform,MSTP)、分组传送网(Packet Transport Network,PTN)、自动交换光网络(Automatic Switch Optical Network,ASON)、波分复用(Wavelength Division Multiplexing,WDM)以及光传送网(Optical Transport Network,OTN)等,探讨传输技术运用途径,提出优化通信设备、传输线路、光纤通信传输技术等策略,以期能够为用户提供更好的服务。展开更多
It is difficult to find the projectile when people want to get the penetration data in a hard recovery method,so a recovery system of penetration data is designed based on an ejection mode from the projectile base and...It is difficult to find the projectile when people want to get the penetration data in a hard recovery method,so a recovery system of penetration data is designed based on an ejection mode from the projectile base and a method of wired transmission,at the same time,the system was sealed with a designed sealing device,the working principle of which was introduced.Using Fluent as the simulation platform,the transient pressure of seal cavity was simulated based on the change of chamber pressure,and steady-state pressure of seal clearance and seal cavity were simulated based on the maximum chamber pressure.The sealing performance was tested by apressure test system.The results of simulation and experiment show that the maximum pressure of seal cavity is 139.4kPa when the maximum chamber pressure is 242.9MPa and the maximum temperature of gunpowder explosive gas is2 166.5K,so the sealing performance can be assured.The sealing device can be taken as a reference in sealing research on gunpowder gas at the bottom of projection.展开更多
文摘从有线传输技术概述入手,阐述同步数字系列(Synchronous Digital Hierarchy,SDH)、多业务传送平台(Multi-Service Transmission Platform,MSTP)、分组传送网(Packet Transport Network,PTN)、自动交换光网络(Automatic Switch Optical Network,ASON)、波分复用(Wavelength Division Multiplexing,WDM)以及光传送网(Optical Transport Network,OTN)等,探讨传输技术运用途径,提出优化通信设备、传输线路、光纤通信传输技术等策略,以期能够为用户提供更好的服务。
文摘It is difficult to find the projectile when people want to get the penetration data in a hard recovery method,so a recovery system of penetration data is designed based on an ejection mode from the projectile base and a method of wired transmission,at the same time,the system was sealed with a designed sealing device,the working principle of which was introduced.Using Fluent as the simulation platform,the transient pressure of seal cavity was simulated based on the change of chamber pressure,and steady-state pressure of seal clearance and seal cavity were simulated based on the maximum chamber pressure.The sealing performance was tested by apressure test system.The results of simulation and experiment show that the maximum pressure of seal cavity is 139.4kPa when the maximum chamber pressure is 242.9MPa and the maximum temperature of gunpowder explosive gas is2 166.5K,so the sealing performance can be assured.The sealing device can be taken as a reference in sealing research on gunpowder gas at the bottom of projection.
