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| 1 | Fault diagnosis of wind turbine bearing based on stochastic subspace identification and multi-kernel support vector machine显示文摘In order to accurately identify a bearing fault on a wind turbine, a novel fault diagnosis method based on stochastic subspace identification(SSI) and multi-kernel support vector machine(MSVM) is proposed. Firstly, the collected vibration signal of the wind turbine bearing is processed by the SSI method to extract fault feature vectors. Then, the MSVM is constructed based on Gauss kernel support vector machine(SVM) and polynomial kernel SVM. Finally, fault feature vectors which indicate the condition of the wind turbine bearing are inputted to the MSVM for fault pattern recognition. The results indicate that the SSI-MSVM method is effective in fault diagnosis for a wind turbine bearing and can successfully identify fault types of bearing and achieve higher diagnostic accuracy than that of K-means clustering, fuzzy means clustering and traditional SVM. | Hongshan ZHAO Yufeng GAO Huihai LIU Lang LI | 2019 | Journal of Modern Power Systems and Clean Energy2019，7，2： | 12 |
| 2 | 基于双应变胡克模型的岩石非线性弹性行为分析显示文摘富含孔隙/裂隙岩体的非线性变形对于工程的安全评价具有重要意义。在多物理场耦合分析求解器TOUGH-FLAC3D中实现双应变胡克模型(two-part Hooke s model,简称TPHM)的数值解法,并界定TPHM的适用条件。TPHM假设:对于岩体中可承受较大变形的软体(如孔隙、裂隙等),用基于自然应变(或真应变,即岩体变形与当前应力状态下的岩体体积之比)的胡克定律来描述;而对于只承受较小变形的硬体部分用基于工程应变(岩体变形与原始应力状态下的岩体体积之比)的胡克定律来描述。通过对室内岩样的应力-应变特征计算分析,表明TPHM在本质上反映了加卸载过程中低应力阶段的非线性变形行为,该力学响应完全取决于孔隙/裂隙的自然应变(真应变);通过对瑞士Mont Terri岩石实验室的深部ED-B巷道围岩的变形场计算分析,显示出TPHM较为准确地反映了开挖卸载诱发的围岩变形特征。因为TPHM本质上是考虑了低应力状态下孔隙/裂隙对岩石力学性质的影响,因此,在具有卸荷扰动特征的岩石工程中应用TPHM模型进行设计分析更符合实际。 | 李连崇 LIU Huihai 赵瑜 | 2012 | 岩石力学与工程学报2012，31，10： | 10 |
| 3 | A theoretical derivation of the Hoek-Brown failure criterion for rock materials显示文摘This study uses a three-dimensional crack model to theoretically derive the Hoeke Brown rock failure criterion based on the linear elastic fracture theory. Specifically, we argue that a failure characteristic factor needs to exceed a critical value when macro-failure occurs. This factor is a product of the microfailure orientation angle(characterizing the density and orientation of damaged micro-cracks) and the changing rate of the angle with respect to the major principal stress(characterizing the microscopic stability of damaged cracks). We further demonstrate that the factor mathematically leads to the empirical Hoeke Brown rock failure criterion. Thus, the proposed factor is able to successfully relate the evolution of microscopic damaged crack characteristics to macro-failure. Based on this theoretical development, we also propose a quantitative relationship between the brittleeductile transition point and confining pressure, which is consistent with experimental observations. | Jianping Zuo Huihai Liu Hongtao Li | 2015 | Journal of Rock Mechanics and Geotechnical Engineering2015，7，4： | 6 |
| 4 | Sulfur-containing compounds as electrolyte additives for lithium-ion batteries显示文摘Originating from“rocking-chair concept”,lithium-ion batteries(LIBs)have become one of the most important electrochemical energy storage technolo-gies,which have largely impacted our daily life.The utilization of electrolyte additives in small quantities(≤5%by wt or vol)has been long viewed as an economical and efficient approach to regulate the properties of electrolyte and electrode–electrolyte interphases and consequently improve the cycling perfor-mance of LIBs.Among all the kinds of electrolyte additives,sulfur-containing compounds have gained significant attention due to their unique features in building stable electrode–electrolyte interphases and protect battery cells from overcharging.In this work,advances and progresses of sulfur-containing addi-tives used in LIBs are overviewed,with special attention paid to the working mechanisms of these electrolyte additives.Particularly,four representative sulfur-containing compounds(i.e.,1,3-propane sultone,prop-1-ene-1,3-sultone,1,3,2-dioxathiolane-2,2-dioxide,and ethylene sulfite)are comparatively dis-cussed concerning their impact on electrode–electrolyte interphases and cell per-formances.Future work on the development of sulfur-containing compounds as functional electrolyte additives is also provided.The present review is antici-pated to be not only a base document to access the status quo in this research domain but also a guideline to select specialized additives and electrolytes for practical applications. | Bo Tong Ziyu Song Huihai Wan Wenfang Feng Michel Armand Jincheng Liu Heng Zhang Zhibin Zhou | 2021 | InfoMat2021，3，12： | 6 |
| 5 | A relative permeability model for deformable soils and its impact on coupled unsaturated flow and elasto-plastic deformation processes.显示文摘Relative permeability is an indispensable property for characterizing the unsaturated flow and induced deformation in soils. The widely used Mualem model is inadequate for deformable soils because of its assumption of a rigid pore structure and the resultant unique dependence of the tortuosity factor on the volumetric water content. In this study, a unified relationship between the relative permeability and the effective degree of saturation was proposed for deformable soils by incorporating our newly developed water retention curve model into the original Mualem model, in which a new tortuosity factor was defined using the fractal dimension of flow paths and the mean radius of water-filled pores for representing the effect of pore structure variation. The modified deformation-dependent relative permeability model was verified using test data on five types of soils; the verification revealed a much better performance of the proposed model than the original model, which commonly overestimates the relative permeability of deformable soils. Finally, the proposed model was implemented in a coupled numerical model for examining the unsaturated flow and elastoplastic deformation processes in a soil slope induced by rain infiltration. The numerical results showed that the deformation-dependent nature of relative permeability has a remarkable effect on the elastoplastic deformation in the slope and that neglect of the deformation-dependent behavior of relative permeability causes overestimation of the depth of failure. | HU Ran CHEN YiFeng LIU HuiHai ZHOU ChuangBing | 2015 | Science China(Technological Sciences)2015，58，11： | 4 |
| 6 | Mont Terri试验场Mine-by巷道开挖近场响应模拟分析显示文摘瑞士Mont Terri地下实验室于2008年构建Mine-by(MB)Niche巷道,并围绕其中的MB Niche 2进行开挖诱发Opalinus Clay黏土岩围岩变形及流固耦合特征的现场实测分析。以MB Niche 2巷道为背景工程,利用基于双应变胡克模型(TPHM)的数值模拟方法,对MB Niche 2巷道的开挖过程进行模拟分析,计算结果较为准确地反映开挖卸载诱发的近场围岩变形行为、损伤区及孔隙水压力演化特征。模拟结果显示,巷道拱顶径向位移可达甚至超过10 mm,两帮破坏深度可达1.4 m,孔隙压力的扰动区最远可出现在掌子面前方11 m左右,最大孔隙压力可抬升至3.3 MPa,模拟结果与现场实测值表现出较好的一致性。基于双应变胡克模型TPHM的计算结果较基于传统胡克模型SPHM的计算结果更趋于符合实际,这在一定程度上反映出TPHM较好地捕捉到岩石中孔隙、裂隙等的自然应变(真应变)的物理本质,强调合适的本构模型在卸荷开挖工程问题模拟分析中的重要性。 | 李连崇 Liu Huihai Birkholzer Jens Vietor Tim | 2014 | 岩石力学与工程学报2014，33，8： | 3 |
| 7 | Impact of climate change on groundwater re- charge in dry areas: An ecohydrology approach显示文摘 | Liu Huihai | 2011 | Jour- nal of Hydrology2011，407，1： | 1 |
| 8 | Dynamic Bayesian networks modeling for inferring genetic regulatory networks by search strategy: Comparison between greedy hill climb- ing and MCMC methods 显示文摘 | Wu Huihai Liu Xiaohui | 2009 | International Journal of Computational lntellgence2009，5，2： | 1 |
| 9 | The use of two-part Hooke's model(TPHM)to model the mine-by test at Mont Terri Site, Switzerland显示文摘 | Li Lianehong Liu Huihai Birkholzer Jens | 2014 | Computers and Geotechnics2014，58，： | 1 |
| 10 | An elastic stress-strain relationship for porous rock ruder anisotropic stress conditions 显示文摘 | Zhao Yu Liu Huihai | 2012 | Rock Mech Rock Eng2012，45，： | 1 |
| 11 | Characterizing soil preferential flow using iodine–starch staining experiments and the active region model显示文摘 | Feng Sheng Kang Wang Renduo Zhang Huihai Liu | 2009 | Journal of Hydrology2009，367，12： | 1 |
| 12 | Measurement of water quality in LHAASO-WCDA显示文摘Introduction The water Cherenkov detector array(WCDA)is an important detector in the Large High Altitude Air Shower Observatory(LHAASO),which is tasked with continuously surveying VHE gamma-rays sky.The WCDA covers an area of 78,000 m2 and contains 350,000 tons of purified water.The water quality and its stability are critical for its performance and long-term operation.Method Light is exponentially attenuated when propagating in water.Water attenuation length can be obtained by comparing light intensities at different optical path lengths,which is the basic principle of direct measurements.Here,a cylindrical device was designed to continuously monitor and measure water quality in the LHAASO-WCDA.Conclusion The systematic error of the cylindrical device was about 4.1%,indicating it is capable of measuring the water attenuation length in WCDA.Furthermore,suspended particle number and turbidity were confirmed as significantly related to the measured attenuation length. | Huicai Li Mingjun Chen Bo Gao Huihai He Cheng Liu Kai Li Bodong Wang Xiaohao You Yuelei Zhang | 2023 | Radiation Detection Technology and Methods2023，7，2： | 0 |
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