摘要：
A technique of feature extraction based on vibration phase diagram for roller of rolling mill was discussed. Basic theory of roller fault diagnosis based on vibration phase diagram was presented, causes for phase diagram under different conditions was analyzed and a method of computing the eigenvalue for distribution density matrix was provided. To same one roller vibration under identical environment, the cooperation of phase point probability distribution is only relelation to the density of probability distribution, and unconcerned with noise. It is also different to phase point distribution density of different states. A experiment was conducted on ψ500×2 shrewd roller of rolling mill, the feature of roller signal was extracted based on vibration phase diagram and chose Hidden Markov Model (HMM) to build and identify mould. The experiment shows that this system has better identification rate, and proves that this technique is effective.
作者机构：
[Qiu, ChangJun; Chang, Xiyang; Zhou, Ju] Univ S China, Sch Mech Engn, Hengyang, Peoples R China.
通讯机构：
[Zhou, Ju] U;Univ S China, Sch Mech Engn, Hengyang, Peoples R China.
会议名称：
2011 International Conference on Mechatronics and Materials Processing(2011年机电一体化与材料加工国际会议 ICMMP)
会议时间：
2011-11-18
会议地点：
广州
会议主办单位：
[Zhou, Ju;Qiu, ChangJun;Chang, Xiyang] Univ S China, Sch Mech Engn, Hengyang, Peoples R China.
会议论文集名称：
2011 International Conference on Mechatronics and Materials Processing(2011年机电一体化与材料加工国际会议 ICMMP)论文集
关键词：
Micro-forging;Laser cladding;Temperature field;Finite element simulation
摘要：
Micro-plastic deformation was produced on the surface of the laser cladding layer by micro-forging, thus cracks were healed in cladding layer; in order to reduce the thermal stress, preheating the substrate was needed to reduce the temperature gap between cladding layer and substrate. In this paper, temperature field by micro-forging on laser cladding Ni60 layer was simulated on software named DEFORM-2D. Compared the width of cracks, the results showed that reasonable and effective preheating temperature could ensure to reduce or eliminate cracks on laser cladding layer.
作者机构：
[Yue, X.] S China Univ Technol, Sch Mech & Automot Engn, Guangzhou, Guangdong, Peoples R China.;[Zhang, C. L.; Zhu, H. Y.] Guangzhou Univ, Sch Mech & Elect Engineer, Guangzhou, Peoples R China.;[Li, J.] Univ South China, Sch Mech Engn, Hengyang, Peoples R China.
通讯机构：
[Yue, X.] S;S China Univ Technol, Sch Mech & Automot Engn, Guangzhou, Guangdong, Peoples R China.
会议名称：
The 4th International Conference on High Speed Machining(第四届高速加工国际会议 ICHSM'2010)
会议时间：
2011-05-28
会议地点：
武汉
会议主办单位：
[Yue, X.] S China Univ Technol, Sch Mech & Automot Engn, Guangzhou, Guangdong, Peoples R China.^[Zhang, C. L.;Zhu, H. Y.] Guangzhou Univ, Sch Mech & Elect Engineer, Guangzhou, Peoples R China.^[Li, J.] Univ South China, Sch Mech Engn, Hengyang, Peoples R China.
会议论文集名称：
The 4th International Conference on High Speed Machining(第四届高速加工国际会议 ICHSM'2010)论文集
关键词：
Fault diagnosis;Pump;HMM;SVM;Hybrid model
摘要：
A hybrid support vector machine (SVM) and hidden Markov model (HMM) model was introduced into the fault diagnosis of pump. This model had double layers: the first layer used HMM to classify preliminarily in order to get the coverage of possible faults; the second layer utilized this information to activate the corresponding SVMs for improving the recognition accuracy. The structure of this hybrid model was clear and feasible. Especially the model had the potential of large-scale multiclass application in fault diagnosis because of its good scalability. The recognition experiments of 26 statuses on the ZLH600-2 pump showed that the recognition capability of this model was sound in multiclass problems. The recognition rate of one bearing eccentricity increased from SVM's 84.42% to 89.61% while the average recognition rate of hybrid model reached 95.05%. Although some goals while model constructed did not be fully realized, this model was still very good in practical applications.
作者机构：
[Qiu, ChangJun; Zhou, Ju; Cheng, Xiyang] Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Zhou, Ju] U;Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China.
会议名称：
2011 International Conference on Mechatronics and Materials Processing(2011年机电一体化与材料加工国际会议 ICMMP)
会议时间：
2011-11-18
会议地点：
广州
会议主办单位：
[Zhou, Ju;Qiu, ChangJun;Cheng, Xiyang] Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
2011 International Conference on Mechatronics and Materials Processing(2011年机电一体化与材料加工国际会议 ICMMP)论文集
关键词：
Micro-forging;Laser cladding;Microstructures;Finite element simulation
摘要：
In the whole process of micro-forging regulation laser cladding layer, the microstructure structure of cladding layer would change. In order to establish the microstructure evolution of the whole process, firstly re-crystallization model was set up based on Avrami equation and experimental data, and various material constants were gained with regress; secondly calculation for the model was carried out on DEFORM-2D,then the results were compared with experimental data, which showed that calculation results of this model kept good consistency with experimental data, and proved that the model could be applied in a full size finite element simulation of the micro forging process.
摘要：
Slotting process used to achieve modify heavy-loading mine gear.According to the pitch circle radius of gear tooth profile modification is difficult to accurately draw, reverse-designed the profile of the modification slotting cutter fold may occur on the cusp, generating simulation for slotting profile modification is implemented using MATLAB based on engagement theory of slotting process,which can test whether the pitch circle is set to reasonable, to avoid resulting the top or root of conjugate gear’s profiles be cut,achieved the adaptive design of profile modification slotting cutter.
摘要：
The automatic and intellectualized reconstruction is the important way to improve and expand the traditional instrumental function. The surface roughness is an important indicator of effecting parts and products performance. On the basis of using precision measurement technology, electronic technology and computer technology synthetically, the principle and method of the automatic and intellectualized reconstruction of JB-3C Type Surface Roughness Measuring Instrument is mainly introduced, which is to reconstruct the hardware circuit and develop function in view of the flaws that the data processing speed of the traditional instruments is slow and they can not print the curve very abundant and even that operating steps are complicated and other shortcomings. And we adopt Matlab and VC++ mix programming to gather, process, demonstrate, analyze and compute data, which has high applicability and performance price ratio.
摘要：
The effect of catalyst coating distributing on the reactor performance for methane steam reforming(MSR) was numerically investigated. In calculation, the amount catalyst loaded on the microreactor wall was fixed but the catalyst active site density was distributed according to arithmetic progression along the flow direction. Results show that it is possible to get the higher conversion of CH4 and output of H2 due to the higher availability ratio of catalyst surface active sites at this distribution. And this distribution effect is more remarkable at higher space velocity or lower reaction temperature, however, there exists an optimal distribution which can reach the highest CH4 conversion and H2 production at 900K.
摘要：
The development status of profile modification technology and slotting process are described, the paper proposed slotting profile modification process, in view of the advantages of slotting processing. The modification curve of modification gear is fitted in the form of multi-segment involutes by resembling the principle of tooth profile modification on the grinding machine by using generating principles and changing the pressure angle, the formula of modification pressure angles of slotting cutter corresponding sections of involutes deduced,the modification profile of slotting cutter is designed.
摘要：
Cam mechanism has advantages of compact structure, high driving accuracy, good dynamic characteristics, smooth motion, etc. It is implemented that components transmission among the multiple-station of deep groove ball bearing assembly machine by use of cam drive system. Cam followers depending on cam profile achieve the desired law of motion. The core of cam design is the exact cam profile's design. The quick and easy method of cam profile design through Pro/E software is introduced in follow. Components' transmission requirements can be met by cam drive system, which is proved through the analysis of motion simulation.
摘要：
Nanoscale structuring on La"0"."7Sr"0"."3MnO"3 (LSMO) thin film surfaces has been performed by scanning tunneling microscopy (STM) under ambient conditions. From line etching experiments we found that the line-depth increases in a stepwise fashion with increasing bias voltage. It also increases with decreasing scan speed and increasing scan repetition. We observed that the line-depth is an integral multiple of the LSMO out-of-plane lattice constant about 0.4nm. Lateral structure with minimum feature size of 1nm is possible to obtain. In addition, a four-level inverse-pyramid structure has been created on LSMO thin film surfaces. Our work shows the feasibility of using STM to fabricate controllable and complex nanostructures in LSMO thin film. Nanoscale structuring on La"0"."7Sr"0"."3MnO"3 (LSMO) thin film surfaces has been performed by scanning tunneling microscopy (STM) under ambient conditions. From line etching experiments we found that the line-depth increases in a stepwise fashion with increasing bias voltage. It also increases with decreasing scan speed and increasing scan repetition. We observed that the line-depth is an integral multiple of the LSMO out-of-plane lattice constant about 0.4nm. Lateral structure with minimum feature size of 1nm is possible to obtain. In addition, a four-level inverse-pyramid structure has been created on LSMO thin film surfaces. Our work shows the feasibility of using STM to fabricate controllable and complex nanostructures in LSMO thin film.
摘要：
Nanolithography on SrRuO3 (SRO) thin film surfaces has been performed by a scanning tunneling microscope under ambient conditions. The depth of etched lines increases with increasing bias voltage but it does not change significantly by increasing the tunneling current. The dependence of line-width on bias voltage from experimental data is in agreement with theoretical calculation based on field-induced evaporation mechanism. Moreover, a three-square nanostructure was successfully created, showing the capability of fabricating nanodevices in SRO thin films.
关键词：
Atomic force microscopy (AFM);Dislocation;GaN;X-ray diffraction (XRD)
摘要：
The effect of the coalescence of islands on threading dislocations (TDs) in GaN films (300 nm thick) grown on non-annealed and annealed sapphire substrates has been studied. Atomic force microscopy measurements show that the a-type TD density first decreases and then increases during the coalescence process, while the densities of (a + c)- and c-type TDs decrease as coalescence proceeds. X-ray diffraction data indicate that the lattice tilt of GaN films is greatly reduced by coalescence while the change in twist depends on the degree of coalescence. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者机构：
[王湘江] School of Mechanical Engineering, University of South China, Hengyang 421001, China;[王兴松] College of Mechanical Engineering, Southeast University, Nanjing 211189, China
通讯机构：
School of Mechanical Engineering, University of South China, China
