WO2016091084A1 - 一种基于复杂网络的高速列车系统安全评估方法 - Google Patents
一种基于复杂网络的高速列车系统安全评估方法 Download PDFInfo
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- WO2016091084A1 WO2016091084A1 PCT/CN2015/095721 CN2015095721W WO2016091084A1 WO 2016091084 A1 WO2016091084 A1 WO 2016091084A1 CN 2015095721 W CN2015095721 W CN 2015095721W WO 2016091084 A1 WO2016091084 A1 WO 2016091084A1
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- speed train
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L99/00—Subject matter not provided for in other groups of this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/50—Trackside diagnosis or maintenance, e.g. software upgrades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/60—Testing or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N20/00—Machine learning
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N20/00—Machine learning
- G06N20/10—Machine learning using kernel methods, e.g. support vector machines [SVM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Definitions
- the invention belongs to the technical field of high-speed train system safety, and particularly relates to a safety evaluation method for a high-speed train system based on a complex network.
- SVM Small Vector Machine
- kNN k-nearest neighbor
- the weighted kNN-SVM-based safety assessment method based on the position of the component in the system and the reliability of the component, removes the subjective factors in the matrix method, so The safety assessment of high-speed rail has great practical value and promotion significance.
- the object of the present invention is to provide a high-speed train system safety evaluation method based on a complex network, which comprises the following steps:
- Step 1 According to the physical structure relationship of the high-speed train, construct a high-speed train network model G(V, E).
- ⁇ i is the failure rate of node i
- k i is the degree of node i in the complex network theory, that is, the number of edges connected to the node
- Step 2 By analyzing the fault data of the high-speed train operation and combining the physical structure of the high-speed train system, extracting the functional attribute value of the component
- the failure rate ⁇ i and the mean time between failures (MTBF) are used as a training sample set to normalize the training sample set:
- the mean time between failures MTBF is derived from the fault time recorded in the fault data, ie
- Step 3 Use kNN-SVM to classify the security level of the sample.
- the SVM classifiers are respectively created with the most classified faces, and their expressions are as follows:
- K(x ij , x) is a kernel function
- x is a support vector
- a t is a weight coefficient of SVM
- b ij is an offset coefficient
- the above two types of classifiers are respectively combined, and the voting level is used to count the security level to which the component belongs.
- the class with the most votes is the security level of the component;
- the weighting kNN-based discriminant function is defined to re-areify the safety level of the components. The specific steps are as follows:
- x jm is the mth feature attribute of the jth sample point in the test sample
- c im is the mth feature attribute in the i-th sample center
- m is the number of k-nearest neighbors
- u i (x) is the degree of closeness membership of the test sample belonging to the i-th training data
- u i (x (j) ) is the j-th neighbor belonging to the i-th security level Affiliation
- the safety of the high-speed train is divided into the following levels:
- the invention has the beneficial effects that compared with the prior art, the method utilizes the functional attribute degree of the complex network extraction node, and extracts the failure rate and the average time between failures according to the fault data, and performs training through the SVM;
- the existence of the problem of unclassification, considering the positional importance of the node in the system; introducing the weighted kNN-SVM to test the sample points, and finally obtaining the influence of the components on the safety of the high-speed train system, can obtain more accurate classification results, high speed The safety judgment of the train has been verified, and the verification results show that this method has high practical value.
- Figure 1 is a flow chart of a high-speed train safety assessment method based on complex network and weighted kNN-SVM.
- Figure 2 shows the physical structure network model of the high-speed train system.
- Figure 3 shows the areas where the SVM method cannot be classified.
- Figure 4 shows the training set samples.
- the invention provides a high-speed train system safety evaluation method based on a complex network, and the present invention is further described below with reference to the accompanying drawings.
- Figure 1 shows the flow chart of the safety assessment procedure for the high-speed train system.
- 33 components in the bogie system are extracted for the functional structural characteristics of the high-speed train bogie system (step 1.1).
- step 1.2 Based on the physical structure of the bogie system, the interaction between the 33 components is abstracted (step 1.2).
- the components are abstracted into nodes, and the relationship between the components is abstracted into edges.
- the network model of the high-speed train bogie system is shown in Figure 2.
- the functional attribute degree of the node As an input quantity (step 1.3); from the perspective of the reliability attribute of the component, combined with the high-speed train operation failure data, the failure rate ⁇ i and the mean time between failures (MTBF) are selected as inputs (steps 2.1, 2.2).
- the failure rate ⁇ i and the mean time between failures (MTBF) are selected as inputs (steps 2.1, 2.2).
- MTBF mean time between failures
- the classification discriminant function g i (x) s i (x) ⁇ i (x) of the three security levels is calculated, and the final classification of the test sample (as shown in FIG. 4) x (0.02746, 0.01443, 200.75) is obtained.
- the result is the level of security.
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Abstract
Description
Claims (2)
- 一种基于复杂网络的高速列车系统安全评估方法,其特征在于,包括下述步骤:步骤一,根据高速列车物理结构关系,构建高速列车网络模型G(V,E),1.1.将高速列车系统中的部件抽象为节点,即V={v1,v2,…,vn},其中V为节点集合,vi为高速列车系统中的节点,n为高速列车系统中节点的个数;1.2.部件与部件之间存在的物理连接关系抽象为连接边,即E={e12,e13,…,eij},i,j≤n;其中E为连接边的集合,eij为节点i和节点j之间的连接边;其中λi为节点i的失效率,ki为复杂网络理论中节点i的度,即与该节点相连的边数;2.3.利用支持向量机SVM对样本进行训练;步骤三,利用kNN-SVM对样本进行安全等级划分;其中,l为第i个安全等级和第j个安全等级的样本数,K(xij,x)为核函数,x为支持向量,at为SVM的权值系数,bij为偏移系数;3.2.对于待测部件,分别组合上述两类分类器,并使用投票法,对部件所属的安全等级进行计票;得票最多的类,则为该部件所属安全等级;3.3.由于高速列车系统运行环境复杂,因此,利用SVM分类时容易出现无法分类的情况,因此定义基于加权kNN的判别函数,对部件重新进行安全等级划分,具体步骤如下:训练集{xi,yi},…,{xn,yn}中,共有l个安全等级即ca1,ca2,...,cal,第i个安全等级的样本中心为其中ni为第i个安全等级的样本数,则部件xj到第i个安全等级样本中心的欧式距离为式中:xjm为测试样本中第j个样本点的第m个特征属性;cim为第i类样本中心中第m个特征属性;定义距离判别函数定义基于加权kNN的不同类别的样本紧密度为则样本点的分类判别函数为di(x)=si(x)×μi(x) (6)计算样本属于各个安全等级的紧密度di(x),di(x)值最高的类别为样本点预测结果。
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