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Albert ALBERS, Duotai PAN, Leif MARXEN, Claudia BECKE,
《机械工程前沿(英文)》 2010年 第5卷 第3期 页码 261-269 doi: 10.1007/s11465-010-0100-3
关键词: microgear optical distance measurement profile deviation CWL sensor micromechanical technology (MMT)
An adaptive data-driven method for accurate prediction of remaining useful life of rolling bearings
Yanfeng PENG, Junsheng CHENG, Yanfei LIU, Xuejun LI, Zhihua PENG
《机械工程前沿(英文)》 2018年 第13卷 第2期 页码 301-310 doi: 10.1007/s11465-017-0449-7
A novel data-driven method based on Gaussian mixture model (GMM) and distance evaluation technique (DET) is proposed to predict the remaining useful life (RUL) of rolling bearings. The data sets are clustered by GMM to divide all data sets into several health states adaptively and reasonably. The number of clusters is determined by the minimum description length principle. Thus, either the health state of the data sets or the number of the states is obtained automatically. Meanwhile, the abnormal data sets can be recognized during the clustering process and removed from the training data sets. After obtaining the health states, appropriate features are selected by DET for increasing the classification and prediction accuracy. In the prediction process, each vibration signal is decomposed into several components by empirical mode decomposition. Some common statistical parameters of the components are calculated first and then the features are clustered using GMM to divide the data sets into several health states and remove the abnormal data sets. Thereafter, appropriate statistical parameters of the generated components are selected using DET. Finally, least squares support vector machine is utilized to predict the RUL of rolling bearings. Experimental results indicate that the proposed method reliably predicts the RUL of rolling bearings.
关键词: Gaussian mixture model distance evaluation technique health state remaining useful life rolling bearing
许维青,韩福忠
《中国工程科学》 2010年 第12卷 第12期 页码 56-58
北京地下直径线盾构独头掘进距离达5.2 km,因此隧道贯通精度控制难度大。通过测量精度分析,单纯通过导线测量已不能满足设计规定的贯通限差要求,施工中通过导线直接传递定向、洞内加测陀螺边、地上地下控制网紧密联系等辅助方法,提高了贯通横向误差的精度,达到了预期效果。
Pravin Kumar Venkat Rao PADALU; Yogendra SINGH
《结构与土木工程前沿(英文)》 2022年 第16卷 第4期 页码 478-505 doi: 10.1007/s11709-022-0817-1
关键词: unreinforced masonry seismic in-plane and out-of-plane forces pier analysis finite element modelling splint and bandage technique with wire mesh
Establishment of the Comprehensive Evaluation System of Cold Stamping Die Quality
LU Xiao-chun, GUO Sheng, RUAN Feng
《机械工程前沿(英文)》 2006年 第1卷 第1期 页码 80-84 doi: 10.1007/s11465-005-0021-8
A comprehensive evaluation system of die quality, a multiplayer hierarchical amendment index system according to the characteristics of cold stamping die production, an evaluation standard referring to the technique and design rules of dies, and a scientific evaluation by using the multiplayer hierarchical and the fuzzy comprehensive evaluation methods are presented in this paper. The applications show that the system can be used to evaluate the die quality objectively, fairly, and reasonably.
关键词: scientific evaluation stamping multiplayer hierarchical technique evaluation standard
Improved directional-distance filter
JIN Lianghai, LI Dehua
《机械工程前沿(英文)》 2008年 第3卷 第2期 页码 205-211 doi: 10.1007/s11465-008-0025-2
关键词: information distance-weighted directional-distance ADWDDF traditional DDF spatial-distance weighting
《结构与土木工程前沿(英文)》 页码 1341-1356 doi: 10.1007/s11709-023-0988-4
关键词: steel fiber reinforced concrete freeze–thaw cycling Brazilian disc splitting test acoustic emission technique dynamic splitting tensile acoustic emission properties
New method of fault diagnosis of rotating machinery based on distance of information entropy
Houjun SU, Tielin SHI, Fei CHEN, Shuhong HUANG
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 249-253 doi: 10.1007/s11465-011-0124-3
This paper introduces the basic conception of information fusion and some fusion diagnosis methods commonly used nowadays in rotating machinery. From the thought of the information fusion, a new quantitative feature index monitoring and diagnosing the vibration fault of rotating machinery, which is called distance of information entropy, is put forward on the basis of the singular spectrum entropy in time domain, power spectrum entropy in frequency domain, wavelet energy spectrum entropy, and wavelet space feature entropy in time-frequency domain. The mathematic deduction suggests that the conception of distance of information entropy is accordant with the maximum subordination principle in the fuzzy theory. Through calculation it has been proved that this method can effectively distinguish different fault types. Then, the accuracy of rotor fault diagnosis can be improved through the curve chart of the distance of information entropy at multi-speed.
关键词: rotating machinery information fusion fault diagnosis Information entropy distance of the information entropy
《结构与土木工程前沿(英文)》 2023年 第17卷 第5期 页码 796-811 doi: 10.1007/s11709-023-0922-9
关键词: terraced slope safety factor finite element method ABAQUS extended Cam–clay
Efficient utilization of wind power: Long-distance transmission or local consumption?
Yuanzhang SUN, Xiyuan MA, Jian XU, Yi BAO, Siyang LIAO
《机械工程前沿(英文)》 2017年 第12卷 第3期 页码 440-455 doi: 10.1007/s11465-017-0440-3
Excess wind power produced in wind-intensive areas is normally delivered to remote load centers via long-distance transmission lines. This paper presents a comparison between long-distance transmission, which has gained popularity, and local energy consumption, in which a fraction of the generated wind power can be locally consumed by energy-intensive industries. First, the challenges and solutions to the long-distance transmission and local consumption of wind power are presented. Then, the two approaches to the utilization of wind power are compared in terms of system security, reliability, cost, and capability to utilize wind energy. Finally, the economic feasibility and technical feasibility of the local consumption of wind power are demonstrated by a large and isolated industrial power system, or supermicrogrid, in China. The coal-fired generators together with the short-term interruptible electrolytic aluminum load in the supermicrogrid are able to compensate for the intermittency of wind power. In the long term, the transfer of high-energy-consumption industries to wind-rich areas and their local consumption of the available wind power are beneficial.
关键词: wind power long-distance transmission local consumption supermicrogrid
Cracking resistance performance of super vertical-distance pumped SFRC
JIANG Jinyang, SUN Wei, ZHANG Yunsheng, CHEN Cuicui, WANG Jing
《结构与土木工程前沿(英文)》 2008年 第2卷 第2期 页码 179-183 doi: 10.1007/s11709-008-0018-6
Variable eccentric distance-based tool path generation for orthogonal turn-milling
Fangyu PENG,Wei WANG,Rong YAN,Xianyin DUAN,Bin LI
《机械工程前沿(英文)》 2015年 第10卷 第4期 页码 352-366 doi: 10.1007/s11465-015-0361-y
This study proposes an algorithm for maximizing strip width in orthogonal turn-milling based on variable eccentric distance. The machining error model is first established based on the local cutting profile at the contact line. The influencing factors of the strip width are then investigated to analyze their features and determine an optimizing strategy. The optimized model for maximum machining strip width is formulated by adopting a variable eccentric distance. Hausdorff distance and Fréchet distance are introduced in this study to implement the constraint function of the machining error in the optimized model. The computing procedure is subsequently provided. Simulations and experiments have been conducted to verify the effectiveness of the proposed algorithm.
关键词: orthogonal turn-milling variable eccentric distance local cutting profile machining strip-width maximization
姚清林
《中国工程科学》 2009年 第11卷 第6期 页码 153-158
远程公平化是偏向于远程的公平,旨在寻求系统整体的优化。在一定的约束条件下,通过域的分隔、变形,中心的定位与相应的远程运作机制,可消减不利因素对系统的干扰,扩大结构瓶颈,调优技术性弱点、难点、远点、易忽视点的指标期望与实现值,抑小扬大,隐近就远,弥补系统缺陷,或于不完备的条件下构建 完备系统,保障全局利益与远效,推进减灾管理的科学化,改善各个方面的减灾工作。
General modeling and optimization technique for real-world earth observation satellite scheduling
《工程管理前沿(英文)》 页码 695-709 doi: 10.1007/s42524-023-0263-3
关键词: earth observation satellite scheduling general technique optimization algorithm commercial constellation real-world benchmark
标题 作者 时间 类型 操作
Application and evaluation of optical distance measurements in geometrical quality testing of microgears
Albert ALBERS, Duotai PAN, Leif MARXEN, Claudia BECKE,
期刊论文
An adaptive data-driven method for accurate prediction of remaining useful life of rolling bearings
Yanfeng PENG, Junsheng CHENG, Yanfei LIU, Xuejun LI, Zhihua PENG
期刊论文
Seismic safety evaluation methodology for masonry building and retrofitting using splint and bandagetechnique with wire mesh
Pravin Kumar Venkat Rao PADALU; Yogendra SINGH
期刊论文
Establishment of the Comprehensive Evaluation System of Cold Stamping Die Quality
LU Xiao-chun, GUO Sheng, RUAN Feng
期刊论文
Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete
期刊论文
New method of fault diagnosis of rotating machinery based on distance of information entropy
Houjun SU, Tielin SHI, Fei CHEN, Shuhong HUANG
期刊论文
Evaluation of the stability of terraced slopes in clayey gravel soil using a novel numerical technique
期刊论文
Efficient utilization of wind power: Long-distance transmission or local consumption?
Yuanzhang SUN, Xiyuan MA, Jian XU, Yi BAO, Siyang LIAO
期刊论文
Cracking resistance performance of super vertical-distance pumped SFRC
JIANG Jinyang, SUN Wei, ZHANG Yunsheng, CHEN Cuicui, WANG Jing
期刊论文
Variable eccentric distance-based tool path generation for orthogonal turn-milling
Fangyu PENG,Wei WANG,Rong YAN,Xianyin DUAN,Bin LI
期刊论文