共查询到20条相似文献,搜索用时 109 毫秒
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针对工业系统监控数据不均衡导致的故障状态难以被识别问题,提出一种基于随机旋转森林的集成支持向量机(RRFESVM)故障诊断算法,通过将监控数据进行属性随机分割、组合、PCA变换和样本有放回重采样,组建多个新训练子集并使用支持向量机算法进行训练,得到多个支持向量机故障诊断基分类器,集成得到强分类器,由此既保证基分类器之间的差异性,又保证故障诊断精度和分类器性能稳定性,从而解决故障诊断易偏置问题,提高作为少数类的故障状态实时诊断准确率。亚轨道飞行器再入过程实验与TE化工过程实验都表明RRFESVM故障诊断算法能够有效提升不均衡数据情况下的实时故障诊断性能。 相似文献
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为准确地对液压泵的典型故障进行诊断,同时针对支持向量机(Support Vector Machine,SVM)在故障诊断中的参数选择问题,将天牛须搜索算法(Beetle Antennae Search,BAS)应用到SVM的参数优化中,建立BAS-SVM液压泵故障诊断模型,以此来提高SVM在液压泵故障诊断中的性能。液压泵故障诊断实例的结果表明,相比于遗传算法、粒子群算法、果蝇算法等算法的改进算法,BAS得到的SVM参数更优,使SVM获得更高的诊断精度,从而验证了所提方法的有效性。 相似文献
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针对非线性系统故障诊断问题相对复杂的情况,以除湿机作为研究对象,应用ARX模型进行了研究。引入LS-SVM优化算法对ARX模型进行了改进,克服了传统SVM算法的不足。结合实验采集到的实际数据样本,对模型进行了训练。结果表明,改进的算法具有较低的运算复杂度和较快的学习训练速度,对于新的样本输入能够正确分析诊断。由此说明,将LS-SVM ARX模型应用于故障诊断是可行的。 相似文献
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针对不同轴承数据特征选择困难和单个分类器方法在滚动轴承故障诊断中精度较低的问题,提出一种基于分类与回归树的Xgboost(e Xtreme Gradient Boosting)轴承故障诊断算法。Xgboost是包含多个分类器的集成学习方法。通过Xgboost的"提升"思想来提高滚动轴承故障诊断的精度。首先,从滚动轴承的振动信号中提取时域特征参数;然后利用Xgboost算法对滚动轴承故障进行诊断。将SQI-MFS实验平台的轴承振动数据,与传统分类器(支持向量机、邻近算法和人工神经网络)以及单个分类回归树的诊断结果相比,结果表明Xgboost在轴承故障诊断率上优于上述几种算法,且计算时间比传统提升决策树算法短。 相似文献
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针对群智能算法优化支持向量机模型应用在滚动轴承故障诊断领域中易陷入局部最优、准确率较低的问题,提出了一种基于改进麻雀算法(sparrow search algorithm, SSA)优化支持向量机(support vector machine, SVM)的滚动轴承故障诊断方法。首先引入均匀化分布Chebyshev混沌映射初始化麻雀种群,以提高种群空间分布均匀性,之后将自适应惯性权重融入麻雀算法的发现者位置更新,最后对更新位置后的最优麻雀进行随机游走扰动,提高算法的全局和局部搜索能力,避免算法陷入局部最优。将该算法用于支持向量机的参数优化,构建改进麻雀算法优化支持向量机故障诊断模型实现对轴承故障信号的分类诊断。滚动轴承故障诊断试验分析结果表明,该算法模型故障分类效果明显优于粒子群算法优化支持向量机模型、遗传算法优化支持向量机模型和麻雀算法优化支持向量机模型,能够有效识别滚动轴承各故障类型。 相似文献
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基于生物免疫系统的信息处理机理,介绍了被动免疫算法的实现过程,并将其应用到某装备电路板的故障诊断之中。该算法具有边检测边学习的动态调整功能,仿真和实验实例表明,该算法适合于电路板的故障诊断,有较高的故障诊断率。 相似文献
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A novel metaheuristic for continuous optimization problems, named the virus optimization algorithm (VOA), is introduced and investigated. VOA is an iteratively population-based method that imitates the behaviour of viruses attacking a living cell. The number of viruses grows at each replication and is controlled by an immune system (a so-called ‘antivirus’) to prevent the explosive growth of the virus population. The viruses are divided into two classes (strong and common) to balance the exploitation and exploration effects. The performance of the VOA is validated through a set of eight benchmark functions, which are also subject to rotation and shifting effects to test its robustness. Extensive comparisons were conducted with over 40 well-known metaheuristic algorithms and their variations, such as artificial bee colony, artificial immune system, differential evolution, evolutionary programming, evolutionary strategy, genetic algorithm, harmony search, invasive weed optimization, memetic algorithm, particle swarm optimization and simulated annealing. The results showed that the VOA is a viable solution for continuous optimization. 相似文献
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In recent years, application of the agile concept in the manufacturing sector has been researched extensively to reduce the varying effect of customer demands. However, most of the research work is focused on the shop floor of different manufacturing processes, while issues concerning the control of warehouse scheduling in a supply chain have been neglected so far. Realising this in the present research an attempt has been made to address the scheduling aspect of a warehouse in an agile supply chain environment. To resolve the warehouse problem in this paper, the authors have proposed a new Fuzzy incorporated Artificial Immune System Algorithm (F-AIS). This algorithm encapsulates the salient features of a fuzzy logic controller and immune system. The proposed algorithm has been compared with genetic algorithm (GA), simulated annealing (SA) and artificial immune system (AIS) algorithm to reveal the efficacy of the proposed F-AIS algorithm. 相似文献
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A novel immune algorithm is suggested for finding Pareto-optimal solutions to multiobjective optimization problems based on opt-aiNET, the artificial immune system algorithm for multi-modal optimization. In the proposed algorithm, a randomly weighted sum of multiple objectives is used as a fitness function, and a local search algorithm is incorporated to facilitate the exploitation of the search space. Specifically, a new truncation algorithm with similar individuals (TASI) is proposed to preserve the diversity of the population. Also, a new selection operator is presented to create the new population based on TASI. Simulation results on seven standard problems (ZDT2, ZDT6, DEB, VNT, BNH, OSY and KIT) show that the proposed algorithm is able to find a much better spread of solutions and better convergence near the true Pareto-optimal front compared to the vector immune algorithm and the elitist non-dominated sorting genetic system. 相似文献
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借鉴禁忌搜索的思想改进了人工免疫网络算法(aiNet),提出一种禁忌人工免疫网络算法(TS-aiNet).在算法中引入禁忌表,禁忌在网络迭代中亲和力不再增加的细胞,通过特赦准则赦免一些被禁忌的优良状态;增加记忆表,保存成熟的记忆细胞;重新定义高斯变异方式,保证多样化的搜索.利用Markov链分析了该算法的全局收敛性,通过对典型系统的仿真实验分析了该算法的性能,并与克隆选择算法和opt-aiNet算法进行了比较,最终将改进的算法运用到红外与可见光图像配准中,像素级配准精度可以达到0.5像素.实验结果表明,该算法在多模态搜索空间中具有更好的全局收敛性、稳定性和发现极值点能力,能够克服早熟现象,提高图像配准的速度和精度,是一种有效的全局优化方法. 相似文献
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This paper presents an improved artificial bee colony algorithm. Under the framework of the basic artificial bee colony algorithm, this paper redefines the artificial bee colony and introduces search strategies for group escape and foraging based on Levy flight. The proposed algorithm is named artificial bee colony algorithm based on escaped foraging strategy (EFSABC).There are different strategies for scout bees, onlookers, and free bees searching for honey sources in the EFSABC: all working bees relinquish old honey sources due to disturbance, and select different routines to seek new honey sources. Sixteen typical high-dimensional standard functions are used to verify the effectiveness of the proposed algorithm. The EFSABC algorithm outperforms the traditional artificial bee colony algorithm in all aspects. 相似文献
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The study of optimization methods for reliability–redundancy allocation problems is a constantly changing field. New algorithms are continually being designed on the basis of observations of nature, wildlife, and humanity. In this paper, we review eight major evolutionary algorithms that emulate the behavior of civilization, ants, bees, fishes, and birds (i.e., genetic algorithms, bee colony optimization, simulated annealing, particle swarm optimization, biogeography-based optimization, artificial immune system optimization, cuckoo algorithm and imperialist competitive algorithm). We evaluate the mathematical formulations and pseudo-codes of each algorithm and discuss how these apply to reliability–redundancy allocation problems. Results from a literature survey show the best results found for series, series–parallel, bridge, and applied case problems (e.g., overspeeding gas turbine benchmark). Review of literature from recent years indicates an extensive improvement in the algorithm reliability performance. However, this improvement has been difficult to achieve for high-reliability applications. Insights and future challenges in reliability–redundancy allocation problems optimization are also discussed in this paper. 相似文献
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Advanced manufacturing technology requires high-precision capability in multi-axis computer numerical control (CNC) machine tools. At present, the modeling and identification for the drive system of CNC machine tools has some defects. In order to solve the problem, some interdisciplinary theories and methods, such as support vector machines, granular computing, artificial immune algorithms, and particle swarm optimization algorithms, have been used to model and identify multi-axis drive systems for CNC machine tools. An identification method using a support vector machine, based on granular computing, is presented to identify a multi-axis servo drive system model for improving the precision of model identification, and an immune particle swarm optimization algorithm, based on crossover and mutation functions, is proposed to optimize the structure parameters of the support vector machine based on granular computing. The proposed identification method was evaluated by experiments using the multi-axis servo drive system. The experimental results showed that the proposed approach is capable of improving modeling and identification precision. 相似文献