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基于差商的油液监测铁谱图像自适应分割 CSCD PKU
期刊论文 | 2017 , (5) , 1322-1330 | 光学精密工程
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Keyword :

差商 图像分割 油液监测 铁谱图像

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GB/T 7714 温广瑞 , 徐斌 , 张志芬 et al. 基于差商的油液监测铁谱图像自适应分割 [J]. | 光学精密工程 , 2017 , (5) : 1322-1330 .
MLA 温广瑞 et al. "基于差商的油液监测铁谱图像自适应分割" . | 光学精密工程 5 (2017) : 1322-1330 .
APA 温广瑞 , 徐斌 , 张志芬 , 陈峰 . 基于差商的油液监测铁谱图像自适应分割 . | 光学精密工程 , 2017 , (5) , 1322-1330 .
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Control of transient response via polynomial method EI Scopus
会议论文 | 2013 , 332-339 | 6th IFAC Symposium on Mechatronic Systems, MECH 2013
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Abstract :

In this paper, a general discussion on the controller design for transient response control is first conducted based on the polynomial method. It is shown for general all-pole close-loop systems, their step responses have zero or nearly zero overshoot under the nominal characteristic ratio assignment [2.5, 2, 2,&mellip;]; while the time constant τ determines the speed of response. The control of the classical benchmark two-mass system is introduced as a case study, in which the m-IPD control configuration is adopted. It is found the time constant τ cannot be arbitrarily specified under the m-IPD control configuration and the nominal characteristic ratio assignment. The designed m-IPD controller demonstrates a sufficient damping performance. Meanwhile, the large and negative derivative gain designed under the nominal characteristic ratio assignment leads to a poor robustness. Through the complementary sensitivity function analysis, the robustness of the polynomial-based m-IPD controller design is found to depend on the term of (K*ds*2+ Ki*ps*+ Ki*); while the characteristic ratio assignment and the time constant determine the nominal time response of the close-loop control system. © 2013 IFAC.

Keyword :

Characteristic ratio assignments Close-loop control Complementary sensitivity functions Controller designs Damping performance Polynomial methods Speed of response Two mass systems

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GB/T 7714 Ma, Chengbin , Qiao, Yue , Cao, Junyi . Control of transient response via polynomial method [C] . 2013 : 332-339 .
MLA Ma, Chengbin et al. "Control of transient response via polynomial method" . (2013) : 332-339 .
APA Ma, Chengbin , Qiao, Yue , Cao, Junyi . Control of transient response via polynomial method . (2013) : 332-339 .
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Influences of fractional order damping on nonlinear dynamics of cracked rotor EI Scopus CSCD PKU
期刊论文 | 2012 , 46 (1) , 76-80 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

Nonlinear dynamics of cracked rotor system with fractional order damping is investigated with a response-dependent breathing crack model. The fourth order Runge-Kutta method and tenth order continued fraction expansion Euler (CFE-Euler) method are introduced to simulate the proposed system equation of fractional order cracked rotors. The effects of derivative order of damping, rotating speed ratio, crack depth, orientation angle of imbalance relative to the crack direction and mass eccentricity on the system dynamics are demonstrated by bifurcation diagram, Poincare map and rotor trajectory diagram. The results show that the rotor system gets chaotic, quasi-periodic and periodic as the fractional order increases. It is also found that the imbalance eccentricity level, crack depth, rotational speed, fractional damping and crack angle all exert considerable influence on the nonlinear behaviors of cracked rotor system.

Keyword :

Bifurcation diagram Continued fraction expansion Cracked rotor system Fourth order Runge-Kutta methods Fractional order Nonlinear behavior Orientation angles Trajectory diagram

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GB/T 7714 Xue, Shiming , Cao, Junyi , Lin, Jing et al. Influences of fractional order damping on nonlinear dynamics of cracked rotor [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2012 , 46 (1) : 76-80 .
MLA Xue, Shiming et al. "Influences of fractional order damping on nonlinear dynamics of cracked rotor" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 46 . 1 (2012) : 76-80 .
APA Xue, Shiming , Cao, Junyi , Lin, Jing , Chen, Yangquan . Influences of fractional order damping on nonlinear dynamics of cracked rotor . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2012 , 46 (1) , 76-80 .
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分数阶阻尼裂纹转子的非线性动力学特性分析 CSCD PKU
期刊论文 | 2012 , (1) , 76-80 | 西安交通大学学报
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Abstract :

为了有效地提高转子系统特性的分析精度,使其能够准确地进行故障诊断,以Jeffcott转子模型为基础,建立了带有分数阶阻尼和横向呼吸裂纹故障的转子系统的动力学模型.采用4阶龙格库塔法和10阶连分式欧拉法对转子系统的动力学方程进行数值仿真计算,利用轴心轨迹图、Poincare截面映射图和分岔图等,研究了阻尼的分数阶次、转速和裂纹深度对裂纹转子动态特性的影响,并通过实验对理论分析结果进行了验证.分析结果表明:在半临界转速附近,由于裂纹的存在,转子的轴心轨迹呈现明显的双环型(或称内8字形),因此响应中的2倍频分量占主导地位.随着分数次阻尼阶次的增加,转子系统依次经历混沌、准周期和周期运动,同时裂纹深度、不平衡量以及转速对转子系统的动态特性具有明显影响.

Keyword :

非线性动力学 裂纹转子系统 分数阶阻尼

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GB/T 7714 薛士明 , 曹军义 , 林京 et al. 分数阶阻尼裂纹转子的非线性动力学特性分析 [J]. | 西安交通大学学报 , 2012 , (1) : 76-80 .
MLA 薛士明 et al. "分数阶阻尼裂纹转子的非线性动力学特性分析" . | 西安交通大学学报 1 (2012) : 76-80 .
APA 薛士明 , 曹军义 , 林京 , 陈阳泉 . 分数阶阻尼裂纹转子的非线性动力学特性分析 . | 西安交通大学学报 , 2012 , (1) , 76-80 .
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Nonlinear dynamics of duffing system with fractional order damping EI Scopus
会议论文 | 2009 , 4 (PARTS A, B AND C) , 1003-1009 | ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2009
SCOPUS Cited Count: 1
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Abstract :

In this paper, nonlinear dynamics of Duffing system with fractional order damping is investigated. The four order Runge-Kutta method and ten order CFE-Euler methods are introduced to simulate the fractional order Duffing equations. The effect of taking fractional order on the system dynamics is investigated using phase diagrams, bifurcation diagrams and Poincare map. The bifurcation diagram is also used to exam the effects of excitation amplitude and frequency on Duffing system with fractional order damping. The analysis results show that the fractional order damped Duffing system exhibits period motion, chaos, period motion, chaos, period motion in turn when the fractional order changes from 0.1 to 2.0. A period doubling route to chaos is clearly observed. © 2009 by ASME.

Keyword :

Bifurcation diagram Duffing equations Duffing system Excitation amplitudes Fractional order Period doubling route to chaos Poincare map System Dynamics

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GB/T 7714 Cao, Junyi , Ma, Chengbin , Xie, Hang et al. Nonlinear dynamics of duffing system with fractional order damping [C] . 2009 : 1003-1009 .
MLA Cao, Junyi et al. "Nonlinear dynamics of duffing system with fractional order damping" . (2009) : 1003-1009 .
APA Cao, Junyi , Ma, Chengbin , Xie, Hang , Jiang, Zhuangde . Nonlinear dynamics of duffing system with fractional order damping . (2009) : 1003-1009 .
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Long-term vibration trend prediction of rotor system state based on support vector regression and Discrete Wavelet Decomposition EI Scopus
会议论文 | 2009 | 2009 International Workshop on Intelligent Systems and Applications, ISA 2009
SCOPUS Cited Count: 3
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Abstract :

In this paper, an new method is proposed based on support vector regression (SVR) and discrete wavelet decomposition (DWD) for long-term rotor vibration trend forecasting. The feasibility of SVR in long-term vibration trend forecasting is also examined in this paper. And, the discrete wavelet decomposition is used to extract the trend components of vibration time series. Finally, the hybrid prediction model and algorithm of combining SVR and DWD is validated by a group of practical long-term vibration data measured from a flue gas turbine. The results show that the hybrid prediction model possesses more advantageous to forecast long-term state time series than directly using SVR model. © 2009 IEEE.

Keyword :

Discrete wavelet decomposition Hybrid prediction models Rotor vibrations Support vector regression (SVR) Trend forecasting Trend prediction Vibration data Vibration time

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GB/T 7714 Xie, Hang , Wen, Guangrui . Long-term vibration trend prediction of rotor system state based on support vector regression and Discrete Wavelet Decomposition [C] . 2009 .
MLA Xie, Hang et al. "Long-term vibration trend prediction of rotor system state based on support vector regression and Discrete Wavelet Decomposition" . (2009) .
APA Xie, Hang , Wen, Guangrui . Long-term vibration trend prediction of rotor system state based on support vector regression and Discrete Wavelet Decomposition . (2009) .
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Trial mass set transfer matrix and unified field balancing method EI Scopus CSCD PKU
期刊论文 | 2008 , 42 (11) , 1386-1390 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

Limited number of trial runs in field are unable to provide enough characteristic response parameters for the holobalancing method. A new unified holobalancing method is presented. With simplified assumption made for the modal trial mass ratio and the linear response characteristic of the holobalancing technique, the transfer matrix corresponding to a certain correction plane then is extended to the trial set transfer matrix, which is related to a certain order of modal trial mass set. The number of trial runs necessary for the balancing operation is reduced and the balancing efficiency is improved. The feasibility and effectiveness of this method have been confirmed according to the analytical result of a real balancing procedure of a 300 MW turbine generator set.

Keyword :

Analytical results Field balancing Holobalancing In-field Linear response Modal trial mass ratio Response parameters Trial mass set

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GB/T 7714 Liao, Yuhe , Xie, Hang , Zhang, Peng et al. Trial mass set transfer matrix and unified field balancing method [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2008 , 42 (11) : 1386-1390 .
MLA Liao, Yuhe et al. "Trial mass set transfer matrix and unified field balancing method" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 42 . 11 (2008) : 1386-1390 .
APA Liao, Yuhe , Xie, Hang , Zhang, Peng , Liu, Shi , Qu, Liangsheng . Trial mass set transfer matrix and unified field balancing method . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2008 , 42 (11) , 1386-1390 .
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Phase shift orbit with application to holobalancing technique EI Scopus CSCD PKU
期刊论文 | 2008 , 42 (7) , 803-806 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

Phase shift orbit divides the response space into two different regions one of which can improve or and the other deteriorate the rotor balance. It plays a guiding role in the searching procedure for the balancing correction scheme. Considering the situation that the elliptical shaped orbit of an anisotropic rotor system may lead to a nonlinear phase increment relation between the initial phase vector and unbalance weight, the phase compensation formula then is established to implement the guiding function of the phase shift orbit. The effectiveness and correctness of the phase shift orbit is confirmed in a field balancing of a 300 MW turbine generator set.

Keyword :

Anisotropic rotor Correction schemes Field balancing Guiding function Holobalancing Initial phase vector Phase compensation Phase shift orbit

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GB/T 7714 Liao, Yuhe , Zhang, Peng , Lang, Genfeng . Phase shift orbit with application to holobalancing technique [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2008 , 42 (7) : 803-806 .
MLA Liao, Yuhe et al. "Phase shift orbit with application to holobalancing technique" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 42 . 7 (2008) : 803-806 .
APA Liao, Yuhe , Zhang, Peng , Lang, Genfeng . Phase shift orbit with application to holobalancing technique . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2008 , 42 (7) , 803-806 .
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机械故障诊断的遗传-独立分量分析算法 CSCD PKU
期刊论文 | 2008 , (11) , 197-202 | 农业机械学报
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Abstract :

为了解决现有独立分量分析算法需要根据源信号的峭度性质选择二次型函数的问题,提出了一种基于遗传算法的独立分量分析算法.该算法选择互信息作为优化目标,针对互信息计算较复杂的现象,对其进行了简化;采用直方图法估计信号的概率分布,解决了互信息计算问题;采用遗传算法寻找使互信息最小的分离矩阵,实现了对线性混叠信号的分离.模拟信号分离结果表明,改进独立分量分析算法的性能优于FastICA算法.将该算法应用于滚动轴承故障诊断,实验结果表明,改进独立分量分析算法成功地分离出滚动轴承声音信号.

Keyword :

遗传算法 独立分量分析 故障诊断 互信息

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GB/T 7714 李良敏 , 温广瑞 , 王生昌 et al. 机械故障诊断的遗传-独立分量分析算法 [J]. | 农业机械学报 , 2008 , (11) : 197-202 .
MLA 李良敏 et al. "机械故障诊断的遗传-独立分量分析算法" . | 农业机械学报 11 (2008) : 197-202 .
APA 李良敏 , 温广瑞 , 王生昌 , 刘红梅 . 机械故障诊断的遗传-独立分量分析算法 . | 农业机械学报 , 2008 , (11) , 197-202 .
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试重组迁移矩阵及现场混合动平衡方法 CSCD PKU
期刊论文 | 2008 , (11) , 1386-1390 | 西安交通大学学报
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Abstract :

针对全息动平衡方法在现场应用中可能存在因试重起车次数受限、无法获得足够的转子特征响应参数的问题,提出了一种基于试重组的全息现场混合动平衡方法.借鉴Darlow混合法中模态试重组的思想,通过对模态试重比的简化假设,利用迁移矩阵的线性可叠加性将对应于某单一平衡面的迁移矩阵扩展为对应于某阶模态试重组的迁移矩阵,从而减少了平衡高阶不平衡量所需的试重起车次数,提高了现场平衡效率,且平衡效果良好.通过对一台300 MW汽轮发电机组的现场动平衡过程的试验分析,表明了该方法的可行性和有效性.

Keyword :

迁移矩阵 试重组 全息动平衡 模态试重比

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GB/T 7714 廖与禾 , 谢航 , 张鹏 et al. 试重组迁移矩阵及现场混合动平衡方法 [J]. | 西安交通大学学报 , 2008 , (11) : 1386-1390 .
MLA 廖与禾 et al. "试重组迁移矩阵及现场混合动平衡方法" . | 西安交通大学学报 11 (2008) : 1386-1390 .
APA 廖与禾 , 谢航 , 张鹏 , 刘石 , 屈梁生 . 试重组迁移矩阵及现场混合动平衡方法 . | 西安交通大学学报 , 2008 , (11) , 1386-1390 .
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