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基于支持向量机的旋转机械故障诊断与预测方法研究
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摘要
随着现代科学技术的迅猛发展,旋转机械不断朝着大型化、复杂化、高速化、连续化和自动化的方向发展。这些发展在带来较高生产效率的同时,对设备的安全运转也提出了更高的要求,一旦发生故障,将造成巨大的经济损失,甚至会导致灾难性的人员伤亡事故和严重的社会影响。对设备的故障进行诊断,以及根据历史数据对设备运行状态进行预测,是保证设备安全可靠运行的重要措施,只有如此才能及时有效的处理存在的问题,将故障消除在萌芽状态。本文研究基于支持向量机理论对设备运行状态进行故障诊断并根据历史运行数据对设备未来状态进行预测的方法,建立了设备运行状态预报和故障诊断模型,并对一些关键问题的解决进行了深入研究。本文主要创新工作如下:
     1、提出了基于遗传算法的支持向量机样本平衡方法
     对于故障诊断来说,故障样本一般少于正常样本,所以普遍存在不平衡样本问题。支持向量机在遇到样本不平衡问题时,往往造成“少样本类”的误诊。针对该问题,本文提出了基于遗传算法的样本平衡方法,利用遗传算法中的交叉、变异方式生成子代样本,对“少样本类”进行繁殖扩充,得到更多的该类样本进而达到两类样本的平衡。为使扩充的样本更具有针对性,更有利于形成正确的“分类超平面”,给出了父代样本的选择方法以及子代样本的评价方法。
     2、分析了EMD方法产生虚假分量的原因,并提出了一种识别虚假分量的方法
     作为特征提取的方法,EMD能够较好的处理非平稳、非线性问题,但利用EMD方法对信号进行处理时常常会引入虚假分量,影响分析的准确性,是严重制约EMD方法发展的瓶颈问题。为了消除虚假分量的影响,更好地发挥EMD方法在特征提取中的作用,本文提出基于K-L散度的虚假分量识别方法,该方法利用K-L散度来评价EMD分解得到的各个分量与原信号的关系程度,分量与原信号之间的K-L散度越小,关系程度越大,分量的真实性就越高,反之虚假性就越高,虚假分量通过设定阈值进行判别。同时,文中研究并给出了阂值设定方法。
     3、提出了基于EMD特征提取的支持向量机算法
     在根据历史数据对运行状态进行预测时,特征参数与预测点的关联程度在很大程度上决定了预测值的准确性。目前,特征参数的选取方法主要有两种:一种是基于实测数据的特征,即采集与预测值相关联的影响因素作为特征,如对风电功率预测时选取风速、气压等因素作为特征,但对于振动等一些预测量来说,其影响因素往往十分复杂,不易明确,利用这种方式也就无法建立高精度预测模型;另一种是通过对时间序列的计算得到其特征参数,这类方法中最具代表性且最常用的方法是基于相空间重构的方法,方法利用混沌理论计算嵌入维数和时间延迟重构相空间,得到时间序列的特征,然而嵌入维数以及时间延迟的确定只是从时间序列的动力学特性角度来考虑的,用其构造的特征对于预测模型来说并不一定合适,所以往往会由于二者选取的不恰当而无法得到合适的特征,进而造成预测的精度大大降低。故本文针对预测模型特征选取的问题,提出了基于EMD特征提取的支持向量机算法(EMD-SVM),利用EMD分解后各时间点的分量值作为特征,并与该时间点对应的时间序列值(目标值)共同构成样本,建立预测模型,并通过实验证明其较高的准确性和稳定性。
     4、针对支持向量机存在大规模样本问题提出了基于信息熵的样本长度选择方法
     大规模训练样本问题一直是困扰SVM计算速度提升的瓶颈,过多的训练样本会大大的增加计算成本,而且不一定会带来更准确的预测结果,甚至会导致更严重的偏差。所以,训练样本的长度必须控制在合适的范围内。针对该问题,本文提出了基于信息熵的样本长度选择方法。该方法的基本思想是选取与预测点最相关的历史数据作为训练样本,保证数据信息的完备性和不冗余。靠近预测点的历史数据通常与预测点之间关系越强,这些数据作为训练样本对于预测点来说意义较大;随着距离的增加(时间不断向前推移)关联性越弱,对于预测点意义较小,将这些数据加入到训练样本中会表现出数据波动性增大,平稳性降低,需要对这些点进行删减。本文方法基于这一思想,在历史数据中从前向后依次选取不同的位置作为起始点截取时间序列,计算不同起始点截得时间序列的信息熵值。将对应信息熵最小的起始点作为新时间坐标轴的“0点坐标”,坐标轴负半轴的数据时间久远且与当前状态相关程度低,需剔除,正半轴数据与当前相关程度高,故用来作为训练样本,如此可以保证信息的完备性,同时避免了建立模型时的寻优过程对相关程度较低的训练样本的“照料”。文中通过理论分析和实验的方式从计算时间和预测精度的角度考察了方法的有效性。
With the rapid development of modern science and technology, rotating machinery continues melting towards maximization, complex, high speed, continuous process and automation directions. Not only do these developments lead to higher productivity but also higher requirements are put forward for the safe operation of the rotating machinery, which once goes wrong, enormous economic losses, even catastrophic casualties and serious social impact will be caused. Diagnosing the fault of the equipment and predicting its running state according to historical data are two important measures to ensure its safe and reliable operation. Only in this way, the existing abnormal problems will be detected timely and effectively, so that the fault can be eliminated in the bud. Hence, in this thesis, the two above measures based on support vector machine theory were investigated, a model of fault diagnosis and state prediction was set up, and a further study went on the solution to some key problems. The main achievements consist of as following aspects:
     1. Put forward a sample balance method of SVM based on genetic algorithm.
     For fault diagnosis, fault samples are generally less than the normal samples, so the problem of imbalanced samples universal exists. Using SVM to analyse the imbalanced samples often results in the misdiagnosis of less sample class. Thus, a sample balance method based on SVM of genetic algorithm were put forward to solve the problem, which can be explained by using the crossover and mutation of genetic algorithm to generate progeny sample, breeding and extending the less sample class to obtain more samples, and finally reaching the balance of the two kinds of samples. In order to make the extended samples more pertinence and more conducive to form the correct classification hyperplane, selection method of the parent sample and evaluation method of the progeny sample were given.
     2. Analysed the causes of illusive component resulted from EMD, and proposed a method to identify the illusive component.
     As a feature extraction method, EMD can not only deal with the non-stationary and non-linear problem preferably but to often introduce illusive component by using it for signal processing, which affects the accuracy of the analysis and seriously restrains the development of EMD. For the sake of eliminating the effection of the illusive component and preferably playing EMD in the role of feature extraction, an effective method to identify illusive component was proposed, which used K-L divergence to evaluate the degree of relationship between the decomposition components of EMD and original signal. The smaller K-L divergence the greater degree of relationship as there was higher authenticity of the component, conversely higher falsity. The illusive component can be distinguished through the threshold setting, and the method of which was given.
     3. Raised SVM algorithm based on EMD feature extraction.
     Correlation degree of the characteristic parameter and the predicted point, to a great extent, determines the accuracy of the predicted value while using historical data to predict the running state. At present, there are mainly two selection methods of characteristic parameters:one is to take the measured data, which are the influencing factors associated with predicted value, as the characteristic parameter, such as the wind speed and the air pressure are regarded as the characteristic parameters on predicting the power of wind power, but some pre-measure for vibration, due to the influencing factors are often very complex and difficult to clear, a high-precision prediction model will not be able to be created by using this method; the other is that the characteristic parameters are obtained by calculating the time series, and the most representative and most commonly used one is the method based on phase space reconstruction, which makes use of chaos theory to calculate embedded dimension and time delay for reconstructing phase space and consequently obtaining the characteristics of the time series. However, the determination of embedded dimension and time delay were only considered from the view of dynamics, the characteristic parameters obtained by what is not necessarily appropriate for the prediction model. It is for the inappropriate selection, the appropriate characteristic parameters can not be obtained, resulting in the prediction accuracy greatly reduced. For the problem of feature extraction of prediction model, SVM algorithm based on EMD feature extraction (EMD-SVM) was raised, which took the component value of each time point decomposed from EMD as characteristic parameters and together with the time series value (target value) constituted the sample to establish the prediction model, and its high stability and accuracy were proved by experiments.
     4. Aim at the problem of large-scale training sample of SVM, a new length selection method of the sample based on information entropy was put forward.
     The problem of large-scale training samples has always been a bottleneck plagued the computing speed promotion of SVM. Excessive training samples will greatly increase the calculation cost, not necessarily lead to more accurate prediction results, and even result in more serious deviation. Therefore, the length of the training samples must be controlled within a proper range. Aiming at the above problems, a new length selection method of the sample based on information entropy was put forward. The main idea of the method is to choose the historical data, which most relevant to the prediction point, as the training samples to guarantee the completeness and non-redundancy of the data information. The stronger the relevance of historical data and prediction point is, the larger significance the data as the training samples for forecasting point will be; it goes the other way around with the increasing distance (time goes forward), under the premise of adding the above date to the training sample, the volatility increases and the stationarity reduces, thus prediction point need to be abridged. In this thesis, the time series were cut out through selecting different position from front to back in turn as a starting point in the historical data, of which information entropy were calculated. The starting point corresponding to the minimum information entropy was regarded as the0point coordinate of the new time axis. The negative half shaft data were abridged because of the remoteness and the low degree of correlation with the current state, and due to the high degree of correlation, the positive half shaft data were taken as the training samples, thus completeness of the information can be guaranteed, at the same time the consideration was avoided for the lower related degree training sample in the optimization process of modeling. From the view of computation time and prediction accuracy, the validity of the method was investigated by means of theoretical analysis and experiment.
引文
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