共查询到19条相似文献,搜索用时 234 毫秒
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转子轴心轨迹作为转子故障的典型特征之一,可以提供更具代表性的故障特征信息。对转子轴心轨迹形状进行准确识别是构建转子故障特征征兆的基础。为提高转子轴心轨迹形状识别的泛化能力,提出一种基于深度卷积神经网络的转子轴心轨迹成像及形状识别方法(DimShapeNet)。将转子轴心轨迹映射到二维数字图像中,利用反灰度化预处理方法,去除二维数字图像中多余的颜色信息;将预处理后的转子轴心轨迹数字图像输入深度卷积神经网络中进行训练。结果表明:经过反灰度化预处理的转子轴心轨迹数字图像在深度卷积神经网络的训练中更有优势;相比于传统的转子轴心轨迹形状识别方法,基于深度卷积神经网络的转子轴心轨迹形状识别方法具有更高的准确性和更好的鲁棒性。 相似文献
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在考虑裂纹转轴时变刚度的条件下,基于裂纹转子动力学模型提出了一种基于轴心轨迹形态的转子裂纹故障诊断方法,并对转子系统1/3和1/2临界转速附近的轴心轨迹形态变化进行了分析。结果表明:在1/3和1/2临界转速附近,裂纹转子系统轴心轨迹的内环形状和偏置方向均会随转速发生变化,且偏置按一定的角度改变;轴心轨迹的变化规律为判断转子裂纹故障提供了新的方法,从而提高了转子故障诊断的效率。 相似文献
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鉴于不同类型的电磁力会对转子的稳定运行产生影响,从实际水轮发电机组运行特性出发,利用变阶数微分方程对发电机转子系统进行参数化建模,选定变步长求解器进行计算,结合轴心轨迹图及频谱图分析了不同电磁力对轴系摆度的影响,分别探讨了两种气隙对机组轴系摆度的影响程度。对比两工况的计算结果,发现均匀圆周电磁力有助于提高转子运行的稳定性;而在发电机几何不对中而引起的非均匀电磁力作用时,转子的运行状况有较为复杂的变化,不利于机组安全稳定运行,计算结果与现场检测数据互相印证。 相似文献
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针对旋转机械振动信号数据采集的特点,提出了用数学形态滤波器实现轴心轨迹提纯的新方法。采用形态滤波器提纯轴心轨迹,不考虑转子振动信号的频谱特征,不需要转子故障的先验知识,通过开闭、闭开组合形态滤波器对振动信号滤波处理后即可剔除噪声干扰,得到提纯的轴心轨迹。仿真计算及实例验证了该方法的有效性。与其它方法相比,形态滤波器效果好,算法简单,运算速度快,易于现场采用,有较好的实用价值。 相似文献
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为了提高配电网合环操作质量,避免配电线路出现过流保护误动,确保配电网的顺利运行,研究配电网合环信号相角差的评估方法,为配电网合环操作提供理论基础。分析10 kV配电网合环转电影响因素,利用叠加定理塑造配电网合环等值电路,给出配电网合环信号相角差运算条件,分析并获取配电网电压向量取值范围,得到不同合环方式母线电压相角差评估过程,获取夏大、夏小两种情况下不同合环方式的相角差分布结果,以及不同情况下的合环方式和合环运算采取的母线电压取值方案。仿真实验结果说明,所提方法具有较高的配电网合环信号相角差评估准确度,稳定性较高,提高合环操作的成功率。 相似文献
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In this article the effect of delaminations on the load carrying capacity of a large wind turbine blade is studied numerically. For this purpose an 8.65 m long blade section with different initial delaminations in the main spar was subjected to a flapwise dominated bending moment. The model was setup in Abaqus and cohesive elements were chosen for modelling delamination growth.For initial delaminations with a width of 30–50% of the cap width the study showed that delamination close to the surface started to grow in load ranges of normal operation conditions and led to local buckling modes. The local buckling caused high strains and stresses in the surrounding of the delamination, which exceeded the material design properties and therefore should be considered as dangerous.Delaminations placed near the mid-surface of the cap did not have a significant effect on the blade response under normal operation conditions. In the simulations the static load exceeded the design load by more than 40% before delamination growth or cap buckling occurred.It could be concluded that delamination induced near-surface buckling modes have to be considered critical due to an onset of local sublaminate buckling below the design load level. 相似文献
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《全球能源互联网(英文)》2019,2(4):336-341
The nuclear power plant is suitable for base-load operation, while the pumped-storage unit mainly gives play to capacity benefit in the electric power system; hence, the integrated development and hybrid operation mode of the two can better meet the needs of the electric power system. This article first presents an analysis of the necessity and superiority of such mode, then explains its meaning and analyzes the working routes. Finally, it proposes the business modes as follows: low price pumping water electricity plus nuclear power in the near term; nuclear power shifted to pumped storage power participating in market competition in the middle term; and, in the long term, nuclear power shifted to pumped storage power as primary and serving as an electric power system when needed. 相似文献
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《全球能源互联网(英文)》2018,1(2):130-136
This paper conducts comprehensive analysis about operational characteristics, market value, stakeholders, and operating modes of a megacity energy Internet. An innovating “one platform, two centers, and multiple nodes” operation management model is proposed. The study provides an in-depth explanation of the new operation and management model of the connotation and logical relationship. Building a comprehensive energy service platform, developing an integrated energy dispatch center, a market trading service center, communication, and other parts of the system needed to achieve benefits for all parties is including in the discussion. The proposed new model of operation and management has important guiding significance and reference for the development and construction of energy Internets in megacities. 相似文献
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原柴油机驱动的F5 0 0泥浆泵组 ,动力轴系发生扭振导致万向轴频繁破坏。为此设计了液力变矩器和限矩轴 ,利用液力元件传动柔和、可有效隔绝振动的特性和湿式铜基摩擦片在设定压力下有相应的摩擦力矩范围的特性 ,通过合理的润滑、散热设计 ,从理论和实践上解决了扭振造成的疲劳破坏问题 ,这一设计思想在油田实际装机试验中得以实施和验证 相似文献