一种基于变流器的高速数据流的故障记录系统的研究与设计

当传动控制变流器设备运行时,其过程、控制数据流通常呈现高速实时性,而设备突发故障时常因运行状态数据的缺失,无法进行故障快速定位修复,造成大量资源成本的浪费.基于上述工程现象,针对变流器内部运行数据流的主要特征,提出了改进的新型数据流缓存算法机制,并设计了高速故障数据记录系统.最后,通过大量实验进行测试,验证了该系统的有效性和可靠性,可以助力实现设备故障的快速定位分析.

基于FPGA的多通道出砂振动信号缓存系统研究

非侵入式出砂监测是油气开采过程中涉及到的一项关键技术。针对线性阵列式出砂监测探头的多通道同步数据缓存需求以及保证波形完整性的数据预触发需求,提出了一种适合现场可编程门阵列(Field Programmable Gate Array,FPGA)实现的,具有自适应预触发功能的多通道出砂振动信号缓存系统架构,分析了实现该系统架构的关键技术,完成了具体的逻辑设计。这种系统架构采用新的自适应预触发方法,并利用乒乓操作原理,具有良好的通道扩展性。最后,以五通道自适应预触发数据缓存系统为例,对该多通道出砂振动信号缓存系统的功能完整性进行了功能仿真和板级测试。测试结果表明,基于该架构设计的多通道数据缓存系统能够完成连续数据流的自适应预触发缓存,系统架构功能完整有效。

Evaluation of Program Code Caching for Mobile Agent Migrations

Mobile agents are able to migrate among machines to achieve their tasks. This feature is attractive to design, implement, and maintain distributed systems because we can implement both client-side and server-side programming in one mobile agent. However, it involves the increase of data traffic for mobile agent migrations. In this paper, we propose program code caching to reduce the data traffic caused by mobile agent migrations. A mobile agent consists of many program codes that define a task executed in each machine they migrate; thus, the mobile agent migration involves the transfer of their program codes. Therefore, our method reduces the number of the transfer of program codes by using program code cache. We have implemented our method on a mobile agent framework called Maglog and conducted experiments on a meeting scheduling system.