分析了AFDX(avionics full duplex switched Ethernet)高速数据采集记录系统的需求,设计了系统的执行流程,确定了系统的模块组成,介绍了各模块的实现方案。利用多线程、循环缓冲区等技术,实现AFDX总线高速长时间无故障数据采集。该数据...分析了AFDX(avionics full duplex switched Ethernet)高速数据采集记录系统的需求,设计了系统的执行流程,确定了系统的模块组成,介绍了各模块的实现方案。利用多线程、循环缓冲区等技术,实现AFDX总线高速长时间无故障数据采集。该数据采集记录系统采用MFC实现,并利用了TeeChart控件。展开更多
Pyrotechnic devices are widely used in the aerospace and defense industries.However,these devices generate high-frequency and high-amplitude shock responses during their use,compromising safe operation of the system.I...Pyrotechnic devices are widely used in the aerospace and defense industries.However,these devices generate high-frequency and high-amplitude shock responses during their use,compromising safe operation of the system.In this paper,the application of a thin-walled circular tube as the energy absorber in pyrotechnic devices is investigated.To accurately predict the shock load and the buffer performance of the thin-walled circular tube,a coupled model connecting the energetic material combustion and finite element simulation is established.The validity of the coupled model is verified by comparing with experiments.Then,the collapse mechanism of the thin-walled circular tube is studied,and the influence of multiple structural parameters on its buffer performance is analyzed.The results show that the thin-walled circular tube effectively reduces the shock overload.The maximum shock overload reduced from 572612g to 11204g in the studied case.The structural parameters of the thin-walled circular tube mainly affect the deformation process and the maximum shock overload.The order of importance of structural parameters to the maximum shock overload is determined,among which the wall thickness has the most significant effect.展开更多
文摘分析了AFDX(avionics full duplex switched Ethernet)高速数据采集记录系统的需求,设计了系统的执行流程,确定了系统的模块组成,介绍了各模块的实现方案。利用多线程、循环缓冲区等技术,实现AFDX总线高速长时间无故障数据采集。该数据采集记录系统采用MFC实现,并利用了TeeChart控件。
文摘Pyrotechnic devices are widely used in the aerospace and defense industries.However,these devices generate high-frequency and high-amplitude shock responses during their use,compromising safe operation of the system.In this paper,the application of a thin-walled circular tube as the energy absorber in pyrotechnic devices is investigated.To accurately predict the shock load and the buffer performance of the thin-walled circular tube,a coupled model connecting the energetic material combustion and finite element simulation is established.The validity of the coupled model is verified by comparing with experiments.Then,the collapse mechanism of the thin-walled circular tube is studied,and the influence of multiple structural parameters on its buffer performance is analyzed.The results show that the thin-walled circular tube effectively reduces the shock overload.The maximum shock overload reduced from 572612g to 11204g in the studied case.The structural parameters of the thin-walled circular tube mainly affect the deformation process and the maximum shock overload.The order of importance of structural parameters to the maximum shock overload is determined,among which the wall thickness has the most significant effect.
