摘要
目前集散控制系统(DCS)/现场总线控制系统(FCS)工程验收中输入/输出(I/O)通道合格与否只接受定性测量。为了更精确的评价DCS/FCS设备质量,评估设计、安装、调试的水平,该文提出一种定量测量的方法。该方法基于统计学中假设检验的原理,根据OC特征曲线,限制第1类错误与第2类错误发生的概率,以确定信号测量的次数。对于测量结果的均值采用t检验,方差采用χ2检验,两次检验临界点处的显著性水平用来量化I/O通道品质。对于FAT测试与可用率测试中成对数据的差异可采用t检验,检验临界点处的显著性水平检验可作为设计、安装、调试水平的量化指标。文中继而提出测试步骤,最后通过工程实例证明了基于假设检验的定量测试方法的有效性与正确性,为工程验收测试的进一步改进拓展了思路。
At present in DCS （ distributed control system ） / FCS （fieldbus control system） acceptance test, input/output channels are received a test on whether they are up to stand or not. In order to evaluate the quality of FCS/DCS and appraise the level of design, installment and commissioning more accurately, a new quantification test method is proposed. The method is based on the hypothesis testing of statistics. According to operating characteristic curve, the number of measurements of a signal is determined by limitation of the probability of Type Ⅰerror and Type Ⅱ error. For the measurement result, t test is adopted in its mean and X^2 test in its variance. The levels of significance in critical values in both tests are adopted to quantify the quality of input/output channel. Moreover t test is adopted to evaluate the difference of paired observations in FAT test and availability test, and the level of significance in critical values can serve as the quantification index of the level of design, installment and commissioning. Subsequently measurement procedure is proposed. Ultimately numerical simulation results of DCS acceptance test demonstrate the validity and advantage of the quantification test method based on hypothesis testing and also shed new light on further improvement of DCS/FCS acceptance test.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第24期114-117,共4页
Proceedings of the CSEE
