CAJ | 학술논문

通过分析列车通信网络协议分析装置（TPA）的丢包原因，得出减小 TPA 丢包率的研究重点在于减小从 WTB（或MVB）板到 PC 机传输一个数据包消耗的总时间。进而以最小丢包率为目标函数，以超时检测的延时、传输一个数据包额外花费的时间和总线的通信负载率为约束条件，建立描述 TPA 丢包率的数学模型，得到各个控制参量的约束区间。从通信板硬件、CPU 板软件和人机接口软件等层面进行 TPA 设计。仿真结果验证了约束区间设置的合理性和模型建立的正确性；实验测试表明：TPA 在通信满负载的条件下不丢包，达到设计要求。
통과분석열차통신망락협의분석장치（TPA）적주포원인，득출감소 TPA 주포솔적연구중점재우감소종 WTB（혹MVB）판도 PC 궤전수일개수거포소모적총시간。진이이최소주포솔위목표함수，이초시검측적연시、전수일개수거포액외화비적시간화총선적통신부재솔위약속조건，건립묘술 TPA 주포솔적수학모형，득도각개공제삼량적약속구간。종통신판경건、CPU 판연건화인궤접구연건등층면진행 TPA 설계。방진결과험증료약속구간설치적합이성화모형건립적정학성；실험측시표명：TPA 재통신만부재적조건하불주포，체도설계요구。
The paper concludes that reducing packet loss rate of the Train -Communication -Network Protocol Analyzer(TPA)is focused on decreasing the total time of transmitting a data packet from WTB (or MVB)board to PC through analyzing the packet loss reason for TPA.Regarding the minimum packet loss rate as the objective function,and treating the delay of timeout detection,the extra time of transmitting a data packet,and the com-munication load rate of bus as constrained condition,the paper establishes math model of the packet loss rate for TPA and calculates the constrained areas of each control parameter.This model can also design TPA from the points of communication -board hardware,software of CPU board and man -machine interface.Simulation re-sults verify that the setting of constrained areas is reasonable and the establishment of model is correct.Experi-mental tests show that TPA doesn’t lose data package under the condition of full communication load,and those meet the design requirements.