对现场可编程门阵列（FPGA）在轨重构配置文件压缩，可以大大减少遥控上注时间。为此，文章利用FPGA配置文件中0值较多的特点，结合游程编码（RLC）及字典编码的优势，提出一种FPGA在轨重构配置数据压缩算法，即结合零游程（Zeros Run L...对现场可编程门阵列（FPGA）在轨重构配置文件压缩，可以大大减少遥控上注时间。为此，文章利用FPGA配置文件中0值较多的特点，结合游程编码（RLC）及字典编码的优势，提出一种FPGA在轨重构配置数据压缩算法，即结合零游程（Zeros Run Length，ZRL）编码的VLZW压缩算法（简称为ZRL—VLZW算法）。为减小航天器载计算机内存开销，使用索引迭代方式存储字典并限制字典长度。采用航天器常用FPGA多种资源占用比的配置文件，利用ZRL—VLZW、LZW和VLZW算法进行压缩测试比较。结果表明：ZRL-VLZW算法性能优于LZW算法和VLZW算法，可有效进行配置文件的压缩，使在轨重构注入数据上注时间减少为原来的1／20～1／3。展开更多
In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were design...In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were designed, manufactured and tested. These impellers have different shapes of hub on the meridional plane with each other. Moreover, these types of impeller were made for the 5 times and the 6 times size of the final target centrifugal impeller with the outer diameter of 4ram in order to assess the similitude for the impellers. The comparison among the performance characteristics of the impellers revealed the influence of the meridional configuration on the performance and the similitude of the compressors.展开更多
文摘对现场可编程门阵列（FPGA）在轨重构配置文件压缩，可以大大减少遥控上注时间。为此，文章利用FPGA配置文件中0值较多的特点，结合游程编码（RLC）及字典编码的优势，提出一种FPGA在轨重构配置数据压缩算法，即结合零游程（Zeros Run Length，ZRL）编码的VLZW压缩算法（简称为ZRL—VLZW算法）。为减小航天器载计算机内存开销，使用索引迭代方式存储字典并限制字典长度。采用航天器常用FPGA多种资源占用比的配置文件，利用ZRL—VLZW、LZW和VLZW算法进行压缩测试比较。结果表明：ZRL-VLZW算法性能优于LZW算法和VLZW算法，可有效进行配置文件的压缩，使在轨重构注入数据上注时间减少为原来的1／20～1／3。
文摘In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were designed, manufactured and tested. These impellers have different shapes of hub on the meridional plane with each other. Moreover, these types of impeller were made for the 5 times and the 6 times size of the final target centrifugal impeller with the outer diameter of 4ram in order to assess the similitude for the impellers. The comparison among the performance characteristics of the impellers revealed the influence of the meridional configuration on the performance and the similitude of the compressors.
