ARM嵌入式系统可靠性模糊综合评价方法

ARM Embedded System Reliability Fuzzy Comprehensive Evaluation Method

为保障和提高ARM嵌入式系统的可靠性,引入模糊综合评价方法对典型ARM嵌入式系统的可靠性进行全面评估。根据功能和集成特点,将系统硬件部分、软件部分和系统扩展部分3个部分分别划分成为不同的模块。根据对系统整体可靠性的影响,对ARM嵌入式系统各组成模块进行重要性级别区分。建立4层评价指标体系,结合模糊方法将定性问题量化,利用模糊矩阵变换解决了矩阵一致性问题,并由此得出系统可靠性评价结论。基于ARM的导弹垂直发射控制系统是安全关键系统,使用本文方法对其可靠性进行评估,结果表明该方法为ARM嵌入式系统可靠性评估的一种有效的新方法,利用该系统可以更好地掌握该系统可靠性情况并采取相应措施。

According the IEEE definition, the embedded system is a device used to control, monitor, or assist the operation of equipment, machinery or plants. The embedded system usually supports real-time task, provides storage area protection, extends processor architecture and with very low power consumption. Based on these features, people have developed various kinds of embedded systems. Among them, ARM embedded system is the most important one and is applied widely in many areas, especially in safety critical system, where its reliability determines the reliability of the system. In order to ensure and enhance the reliability of the ARM embedded system, this paper proposes a fuzzy comprehensive evaluation method to realize a more overall and more accurate assessment of the reliability of the typical ARM embedded system. According to the characteristics of functions, the overall ARM embedded system is divided into different modules, including three parts： the hardware part, the software part and the system extension part. Because each module has different impacts on the reliability of the entire system, it is necessary to distinguish the different important level of the ARM embedded system modules. Based on the different important level of the ARM embedded system modules, the evaluation architecture is established, which is divided into three layers, a fuzzy method is introduced to solve the quantitative or qualitative problems. To deal with the matrix inconsistency problem, a fuzzy matrix transformation is used, to get the fuzzy consistency matrix. The evaluation matrix is constructed from the bottom to the top layers, and the rating column vector is combined to get the whole system reliability. Vertical missile launch control system based ARM is a safety critical system, with high reliability requirements. This model is put into application for the ARM embedded system reliability evaluation. The results show that the evaluation model gives an effective method to assess the ARM embedded system reliability.