Multi-index comprehensive evaluation method for reliability of urban rail train security detection sensor network

A technology for safety detection and urban rail trains, applied in the field of modern traffic safety, can solve problems such as the inability to comprehensively and objectively reflect the reliability of the safety detection sensor network, and achieve the effect of being easy to understand

Active Publication Date: 2014-04-09
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, neither a single indicator nor expert scoring can fully and objectively reflect the reliability of the safety detection sensor network. Therefore, an objective and comprehensive eval

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  • Multi-index comprehensive evaluation method for reliability of urban rail train security detection sensor network
  • Multi-index comprehensive evaluation method for reliability of urban rail train security detection sensor network
  • Multi-index comprehensive evaluation method for reliability of urban rail train security detection sensor network

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Embodiment 1

[0017] figure 1 Shown is the flow chart of the multi-index comprehensive evaluation method for the reliability of the urban rail train safety detection sensor network, which contains the following steps:

[0018] (1) Processing samples.

[0019] Since each evaluation index has different influences on the reliability of urban rail train safety detection sensor network, in order to make each evaluation index can be compared with each other in the system and have relative comparability, fuzzy mathematics theory must be used to analyze each evaluation index After normalization processing, the processed evaluation indicators can be used as training samples for the BP neural network. Delay, utilization rate, packet loss rate, and bit error rate are all quantitative indicators. The difference is that delay, packet loss rate, and bit error rate are reverse indicators, that is, the smaller the better, and the utilization rate is a positive indicator, namely The bigger the better. In...

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Abstract

The invention belongs to the technical field of modern traffic safety, and discloses a multi-index comprehensive evaluation method for the reliability of an urban rail train security detection sensor network. A series of indexes influencing the reliability of the urban rail train security detection sensor network is summarized, and the four indexes of time delay, the occupation ratio, the packet loss probability and the error rate are selected as evaluation indexes. The measured values of the evaluation indexes are normalized through a fuzzy mathematic theory, subordinative function values are obtained as samples, a BP neural network is built, the samples are trained, a weight value and a threshold value are modified through a steepest descent method, the samples are trained repeatedly in the same way until the error of an actual output value and the error of a calculated output value are within an acceptable range, the training is finished, and the obtained BP neural network with expert knowledge can comprehensively evaluate the reliability of the urban rail train security detection sensor network. The brand-new method is provided for evaluating the performance of the urban rail train security detection sensor network, and theoretical and practical supports are provided for optimizing the performance of the urban rail train security detection sensor network.

Description

technical field [0001] The invention belongs to the technical field of modern traffic safety. In particular, it relates to a multi-index comprehensive evaluation method for the reliability of an urban rail train safety detection sensor network. Background technique [0002] Urban rail transit trains are one of the main transport carriers of urban large-capacity public transportation, and ensuring their safe operation is extremely important and critical to the entire urban rail transit. The construction of the urban rail train safety detection sensor network is an important prerequisite for the in-transit monitoring and safety warning of urban rail trains. The necessary basis for safeguard measures, ensuring the high reliability of the urban rail train safety detection sensor network is the prerequisite for the construction of the urban rail train safety detection sensor network, and a necessary condition for ensuring the safe operation of the train. [0003] At present, th...

Claims

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Application Information

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IPC IPC(8): G06N3/02
Inventor 贾利民董宏辉田寅秦勇滕志伟胡月马慧茹
Owner BEIJING JIAOTONG UNIV
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