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机床电主轴有限元建模与优化设计 PKU
期刊论文 | 2018 , (5) , 16-18,21 | 机械设计与制造
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Abstract :

根据几何参数和简化原则建立电主轴实体模型.采用滚动轴承拟静力学模型准确计算轴承刚度,建立主轴-轴承系统有限元模型,设计模态测试实验较好地验证了仿真结果.基于主轴有限元模型,以主轴转子外圆直径、内孔直径、悬伸量、支承跨距以及轴承配置形式为设计变量;以主轴转子一阶固有频率最大和质量最轻为优化目标;以主轴转子前端静变形、最大应力、主轴各段尺寸均在限定范围内为约束条件,对电主轴转子进行优化设计.将提出的优化方法应用于某磨齿机电主轴,优化后主轴一阶固有频率提高33%,质量减轻21%,实现了电主轴高刚性和轻质量优化目标,为电主轴数字化设计提供技术支持.

Keyword :

有限元建模 轻质量 优化设计 电主轴 高刚性

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GB/T 7714 蔡俊琼 , 曹宏瑞 . 机床电主轴有限元建模与优化设计 [J]. | 机械设计与制造 , 2018 , (5) : 16-18,21 .
MLA 蔡俊琼 等. "机床电主轴有限元建模与优化设计" . | 机械设计与制造 5 (2018) : 16-18,21 .
APA 蔡俊琼 , 曹宏瑞 . 机床电主轴有限元建模与优化设计 . | 机械设计与制造 , 2018 , (5) , 16-18,21 .
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基于SCADA数据的风机叶片结冰检测方法
期刊论文 | 2018 , (1) , 58-62 | 发电与空调
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Abstract :

针对工作在寒冷地区的风机易出现的叶片结冰现象,提出一种基于SCADA数据的风机叶片结冰检测方法.根据叶片结冰会增大发电机的功率损耗,选择风速与网侧有功功率2个变量,利用主成分分析技术构造对叶片结冰敏感的风速与网侧有功功率在非主成分方向投影特征,通过选择最优阈值使逻辑回归分类器适用于不平衡分类,可以实现风机叶片结冰检测自动化与智能化.通过中国工业大数据创新竞赛数据验证了该方法的有效性.

Keyword :

风机叶片结冰检测 SCADA数据 非主成分方向投影特征 最优阈值选择 不平衡分类

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GB/T 7714 李宁波 , 闫涛 , 李乃鹏 et al. 基于SCADA数据的风机叶片结冰检测方法 [J]. | 发电与空调 , 2018 , (1) : 58-62 .
MLA 李宁波 et al. "基于SCADA数据的风机叶片结冰检测方法" . | 发电与空调 1 (2018) : 58-62 .
APA 李宁波 , 闫涛 , 李乃鹏 , 孔德同 , 刘庆超 , 雷亚国 . 基于SCADA数据的风机叶片结冰检测方法 . | 发电与空调 , 2018 , (1) , 58-62 .
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结合阶次跟踪与动刚度分析的无试重全息动平衡方法 PKU
期刊论文 | 2016 , (16) , 1797-1801,1812 | 中国科技论文
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Abstract :

传统动平衡方法需要通过频繁的试重测试获取机组动力特征参数,对系统振动信息的利用不足、平衡效率低下.在无试重测试条件下获取转子系统动力特征参数是提高转子动平衡效率的关键.首先采用阶次跟踪技术解决了变转速过程的信息提取精度问题,将全息谱拓展应用于非平稳信号的分析和处理;对全息伯德图进行的进动和模态分解,则有效地消除了非平衡因素的干扰;在此基础上通过建立转子系统模型并结合全息谱分析提取动刚度参数,构建并求解激励、动刚度与振动响应的关联方程组,实现了转子不平衡量的无试重计算.实验测试结果表明,本方法在无需试重的情况下实现了转子系统前两阶模态不平衡的一次配重平衡,效果良好,验证了方法的有效性和可靠性.

Keyword :

阶次跟踪 无试重 全息动平衡 动刚度

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GB/T 7714 蒋瑞祥 , 廖与禾 , 李帅 et al. 结合阶次跟踪与动刚度分析的无试重全息动平衡方法 [J]. | 中国科技论文 , 2016 , (16) : 1797-1801,1812 .
MLA 蒋瑞祥 et al. "结合阶次跟踪与动刚度分析的无试重全息动平衡方法" . | 中国科技论文 16 (2016) : 1797-1801,1812 .
APA 蒋瑞祥 , 廖与禾 , 李帅 , 孙鹏 , 陈鹏 . 结合阶次跟踪与动刚度分析的无试重全息动平衡方法 . | 中国科技论文 , 2016 , (16) , 1797-1801,1812 .
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结合阶次跟踪与动刚度分析的无试重全息动平衡方法 PKU
期刊论文 | 2016 , (16) | 中国科技论文
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Keyword :

阶次跟踪 无试重 全息动平衡 动刚度

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GB/T 7714 蒋瑞祥 , 廖与禾 , 李帅 et al. 结合阶次跟踪与动刚度分析的无试重全息动平衡方法 [J]. | 中国科技论文 , 2016 , (16) .
MLA 蒋瑞祥 et al. "结合阶次跟踪与动刚度分析的无试重全息动平衡方法" . | 中国科技论文 16 (2016) .
APA 蒋瑞祥 , 廖与禾 , 李帅 , 孙鹏 , 陈鹏 . 结合阶次跟踪与动刚度分析的无试重全息动平衡方法 . | 中国科技论文 , 2016 , (16) .
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Faulty rotor system vibration acceleration signal integration method based on precise information reconstruction EI Scopus CSCD PKU
期刊论文 | 2013 , 49 (8) , 1-9 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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Abstract :

A faulty rotor system vibration acceleration signal integration method based on precise information reconstruction is proposed in this paper by summarizing the advantages and disadvantages of current integration method both in time domain and frequency domain. This method utilizes the characteristic structure of the faulty rotor system vibration signal, which is mainly composed of the rotational frequency and its superharmonic and/or subharmonic frequency components. The fast Fourier transform is performed to the acceleration signal to get its spectrum, then the characteristic frequency components are searched. Comparing the amplitudes of all the extracted components with a threshold set by SNR. The components, whose amplitudes are below the threshold, will be considered as noise components and will be discarded and only those whose amplitudes are above the threshold will be reserved. The high-accuracy spectrum correction is then made with those components reserved to get the precise information, including frequency, amplitude and phase information, needed for the integration and signal reconstruction. The velocity signal and displacement signal are therefore reconstructed with the precise information of all the reserved components. Precise Information Reconstruction is excellent at removing the broadband noise. The reliability and effectiveness of the proposed method are testified by the simulation analysis and the application examples. © 2013 Journal of Mechanical Engineering.

Keyword :

Characteristic frequencies Displacement signals Error evaluation Frequency components Information reconstruction Rotational frequency Spectrum correction Threshold

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GB/T 7714 Wen, Guangrui , Li, Yang , Liao, Yuhe et al. Faulty rotor system vibration acceleration signal integration method based on precise information reconstruction [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2013 , 49 (8) : 1-9 .
MLA Wen, Guangrui et al. "Faulty rotor system vibration acceleration signal integration method based on precise information reconstruction" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 49 . 8 (2013) : 1-9 .
APA Wen, Guangrui , Li, Yang , Liao, Yuhe , He, Qing . Faulty rotor system vibration acceleration signal integration method based on precise information reconstruction . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2013 , 49 (8) , 1-9 .
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基于精确信息重构的故障转子系统振动加速度信号积分方法 CSCD PKU
期刊论文 | 2013 , (8) | 机械工程学报
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Keyword :

频谱校正 精确重构 快速傅里叶变换 阈值 误差评价

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GB/T 7714 温广瑞 , 李杨 , 廖与禾 et al. 基于精确信息重构的故障转子系统振动加速度信号积分方法 [J]. | 机械工程学报 , 2013 , (8) .
MLA 温广瑞 et al. "基于精确信息重构的故障转子系统振动加速度信号积分方法" . | 机械工程学报 8 (2013) .
APA 温广瑞 , 李杨 , 廖与禾 , 何庆 . 基于精确信息重构的故障转子系统振动加速度信号积分方法 . | 机械工程学报 , 2013 , (8) .
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