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.
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.
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.
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:
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.
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:
According to the traditional tooth profile, modification process cannot meet the traction gear’s technical requirements of the high-speed locomotive. A new way for the tooth profile modification technology was provided in the paper. The slotting profile modification process was proposed, the formulating methods of the tooth profile modification K diagram was introduced, modification curve fit as the sections of involutes, the modification profile angles of slotting cutter corresponding sections of involutes was deduced using the profile angle error analysis theory and the tooth profile of modification slotting cutter precision was designed. The feasibility and advantages of modification slotting cutter were validated by examples, which indicates the widely use of this technology in high-speed locomotive traction gear.
通讯机构:
[Tang, Yonghui] U;Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
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:
[Tang, Yonghui;Lin, Guoxiang] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.^[Zhang, Chunliang] Guangzhou Univ, Sch Mech & Elect Engn, Guangzhou 510006, Guangdong, Peoples R China.
会议论文集名称:
Advanced Materials Research
关键词:
Condition Monitoring;Short Time Fourier Transform (STFT);Roller;Hidden Markov Model (HMM)
摘要:
A kind of signal build mould and identification tool for roller of rolling mill was discussed. Basic algorithm of Hidden Markov model (HMM) theory was presented. For ψ500×2 shrewd roller of rolling mill, the paper led Short-time Fourier transform (STFT) into draw the feature of roller signal and chose Continues Gaussian Hidden Markov Model (CGHMM) to build and identify mould. The experiment installation major included: ψ500×2 shrewd rollers and roller performance test control work of rolling mill control machine as well as a set of online state inspection system. The experiment data was collected by two kinds: roller rotational speed from low to high and from high to low. The experiment shows that this system has better identification rate, and proves that this system is effective.
通讯机构:
[Ouyang, Basheng] U;Univ S China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
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:
[Ouyang, Basheng;Lin, Guoxiang] Univ S China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.^[Zhang, Chunliang] Guangzhou Univ, Sch Mech & Elect Engn, Guangzhou 510006, Guangdong, Peoples R China.
会议论文集名称:
Advanced Materials Research
关键词:
Cycloid-arc profile;Hob cutter for hobbing;Screw compressor rotors
摘要:
The profile of cycloid-arc screw compressor rotors is not a smooth profile, and it has a tip on it. When designing the hob cutter is used for machining this kind of rotors, the profile of hob edge will appear separation. In this paper, the design theory of hob cutter for hobbing the no-symmetric cycloid-arc rotor with tip profile is researched, and the best way for design this kind of hob cutter with a separate edge is attained according to practical design, manufacture and test. Its results are shown that it is good practice to design the hob cutter and hob the cycloid-arc rotor. Thus, the machining method for hobbing screw compressor can enhance high productivity and machining accuracy.
摘要:
Forestry industry is an important part of nation's economy. In this paper, a machine vision system is presented as a key module of Camellia oleifera pluck robot. In order to cut fruit image up from complicate background, SOFM neural network and gray thresh is used in image segmentation. In SOFM method, take R-B,G-R,G-B and hue H tunnel as input feature vectors, use self-organization network to clustering can get the best effect. in gray threshold method can take various of method to get the best threshold, such as PSO and GA algorithm, and MATLAB includes the toolboxes. At last use noise ratio, area ratio, divided time, Fourier boundary descriptors and other indicators to assess the accuracy of segmentation. The methods have the significance to the current and subsequent research of forestry pluck device.
作者机构:
[Qiu, ChangJun; Zhou, Ju; Tang, DeWen] 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:
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:
[Zhou, Ju;Qiu, ChangJun;Tang, DeWen] Univ S China, Sch Mech Engn, Hengyang, Peoples R China.
会议论文集名称:
Advanced Materials Research
关键词:
Laser Cladding;Crack;Micro-Forging;Finite Element (FE) Simulation
摘要:
Micro-plastic deformation is produced on the surface of the laser cladding layer by micro-forging, and crack makes a change in cladding layer. In this paper, a finite element model with a simplified panel strain model elastic-plastic of stress and strain relationship and adaptive meshing technique was used to simulate laser cladding layer crack by using DEFORM-2D software. Laser cladding process of cracks by micro-regulation forging is simulated. Comparing to the measurement of crack width, the results show that micro-forging can make the surface of laser cladding layer the residual tensile stress to adjust compressive stress, and the micro-forging can significantly reduce or eliminate the laser cladding layer crack. Reasonable and effective regulation of high-frequency micro-forging can improve the surface quality in micro-cladding layer.
摘要:
In this paper a new control method has been studied in which PID control system was integrated into the neural network. It could overcome some disadvantages such as neural network’s slow rate of convergence and PID’s difficulty in application of multivariate nonlinear systems. A controller of the Electro-hydraulic proportional control stroking mechanism for radial piston pump was designed based on the PID neural network control algorithm. The system responses of system variable control signal of system track were achieved by computer simulation. It was found by PIDNN that the control system could reach steady state in a shorter time, compared with PID control system response time by 65% to 80%. The simulation results showed that the controller for the Electro-hydraulic proportional Radial Piston Pump based PID neural network control algorithm would have a good controlling performance.
作者机构:
[Li, Biwen] Univ South China, Sch Nucl Sci & Technol, Hengyang, Hunan, Peoples R China.;[Zhang, Chunliang; Li, Biwen; Hu, Liangbin] Univ South China, Sch Mech Engn, Hengyang, Hunan, Peoples R China.;[Xiao, Jinfeng] Univ South China, Sch Elect Engn, Hengyang, Hunan, Peoples R China.
通讯机构:
[Li, Biwen] U;Univ South China, Sch Nucl Sci & Technol, Hengyang, Hunan, Peoples R China.
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, Biwen] Univ South China, Sch Nucl Sci & Technol, Hengyang, Hunan, Peoples R China.^[Li, Biwen;Zhang, Chunliang;Hu, Liangbin] Univ South China, Sch Mech Engn, Hengyang, Hunan, Peoples R China.^[Xiao, Jinfeng] Univ South China, Sch Elect Engn, Hengyang, Hunan, Peoples R China.
会议论文集名称:
Advanced Materials Research
关键词:
Error prediction;Herringbone gear;Noise reduction;Nuclear power turbine;Slotting cutter
摘要:
Relative to gear shaping and gear hob, using gear slotting produces herringbone gear which is used in nuclear power turbine speed redactor has more obvious technical and economic benefits, but profile angle error of slotting cutter causes profile error and base pitch deviation of herringbone gear. It will result in high-frequency noise which damages the tactical and technical performance of warship. By analyzed the wire cutting system of rack cutter used in MAAG type gear machining for herringbone gear, the mathematical model of error prediction for rack cutter profile angle was founded. On the base of model of error prediction, the principle of error control and the method of revision control are presented. Finally, the example of prediction and control is provided.
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:
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.