摘要：
In this paper, an approach of rolling bearing fault diagnosis based on artificial immune system (AIS) is presented. The features extracted from vibration signals are normalized as the original antigens, and an advanced clone selection algorithm (CSA) is applied to train the antibodies. Then use the antibody set to recognize the faults online. The experiments on rolling bearing show the approach is effective and feasible.
摘要：
By defining analysis feature and using analysis results to drive the parametric model, behavioral modeling establishes feature parameter of model automatically for meeting design objectives and making model technology intelligent, that is to say the result could be optimized automatically. In this paper, the application of PRO/E parametric modeling technologies in design of cam profile curve is researched. In order to optimization for dynamic balance of the cam, the methods of defining analysis feature and sensitivity/optimization analysis are proposed by using the technology of PRO/E behavioral modeling. These technologies can enhance the efficiency and quality of the cam design and provide a practical method for 3D modeling of this kind of cam. The fifth generation of CAD model technology named behavioral modeling provides the method of flexible and intelligent solution of practical engineering problems.
会议名称：
International Conference on Manufacturing Engineering and Automation
会议时间：
DEC 07-09, 2010
会议地点：
Guangzhou, PEOPLES R CHINA
会议主办单位：
[Li, Jian] Univ S China Hengyang, Sch Mech Engn, Hengyang 421001, Peoples R China.^[Zhang, Chunliang] Univ Guangzhou, Sch Mech & Elect Engn, Guangzhou PT-510006, Guangdong, Peoples R China.^[Yue, Xia] S China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510641, Guangdong, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Data compression;Partitioned iterated function systems;Vibration signals
摘要：
The partitioned iterated function systems (PIFS) were introduced into the compression of vibration signal. The actual vibration data of ZLH600-2 pump were adopted to verify the performance of PIFS. Also the compression ratios and the computation time were good, but the spectrum and amplitude, as important performances, were deformed after compression. If the concerned frequency of users was significantly lower than the sampling frequency and the required compression ratios was not more than 2, the compression using PIFS in vibration signal of rotating machinery was comfortable. Otherwise, the information loss in the compression could not be ignored. The decoded signals with the different compression parameters were listed in the paper and it was a meaningful exploration of the IFS on diagnosis and laid the foundation for further research.
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.
会议名称：
International Conference on Manufacturing Engineering and Automation
会议时间：
DEC 07-09, 2010
会议地点：
Guangzhou, PEOPLES R CHINA
会议主办单位：
[Li, Sheng] Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China.^[Zhang, Chunliang] Guangzhou Univ, Sch Mechan & Elect Engn, Guangzhou 510006, Guangdong, Peoples R China.^[Yue, Xia] S China Univ Technol, Sch Mechan & Automot Engn, Guangzhou 510641, Guangdong, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Fault Diagnosis;Feature Selection;Fisher’s Discriminant Ratio (FDR);Support Vector Machine (SVM)
摘要：
To effectively avoid the loss of useful information, in this paper, feature information has been extracted from the fault signal of rotating machinery in different aspects such as amplitude-domain, time-domain and time-frequency domain. Then, for the multi-dimensional feature extraction was prone to the problem of “dimension disaster”, the principles of FDR was introduced in data mining to determine the classification ability of each individual feature, and the cross correlation coefficient was adopted to solve the problem that dealing with individual feature. Neglected the interrelationship between the features, a new feature selection algorithm was constructed. Finally, the eigenvectors were used for training and recognizing of SVM model. The experimental results showed the fault diagnosis system was valid and robust.
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.
