Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment

Xiangtan, China

Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment

Xiangtan, China
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Zhou L.,Hunan Institute of Engineering | Zhou L.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Li Y.,Xiangtan University | Fu C.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment
Advanced Materials Research | Year: 2011

A finite element method is used to simulate the deep drawing processes of nickel coating with steel substrate into battery shells. The Belytschko-Wong-Chiang shell elements are used and the kinematical work hardening model is adopted, while the ties with failure contact criterion is given to the coating and substrate interface. The stress-strain field and interfacial stresses in the drawing processes are obtained. The nickel coating appeared to be yielded in the drawing processes, of which the maximum effective stress reached 241MPa, and the biggest effective strain reached 0.7524. The interfacial stresses in the coating and substrate varied during the drawing process, and their maximal values reached 40MPa in compressive state. © (2011) Trans Tech Publications, Switzerland.


Cao H.,Xi'an Jiaotong University | Cao H.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Li B.,Xi'an Jiaotong University | He Z.,Xi'an Jiaotong University
International Journal of Machine Tools and Manufacture | Year: 2012

The chatter stability of machine tool is dependent on the dynamic behavior of the spindle system, which is often expressed as the frequency response function (FRF) at the tool tip. The stability lobe diagram generated from stationary FRFs can lead to an inaccurate prediction in high and ultra high speed machining. This paper presents an alternative approach to predict the chatter stability lobes of high-speed milling with consideration of speed-varying spindle dynamics. With a dynamic model of a high-speed spindle system, the speed effects (i.e., gyroscopic moment and centrifugal forces) on both the spindle shaft and bearings are investigated systematically with simulations and experiments. The gyroscopic moment of the spindle shaft can increase the cross FRFs, but can hardly affect the direct FRFs at the tool tip due to the damping of the spindle system. The centrifugal forces on both the shaft and bearings lower the overall spindle system stiffness evidently as the speed increases. The speed-dependent FRFs at the tool tip are obtained from the dynamic spindle model and then integrated into the characteristic equation of the dynamic milling system. Nyquist stability criterion is used to generate the chatter stability lobe of high-speed milling operations. It is shown that the stability lobes with speed effects shift to the low speed range significantly. Finally, milling tests are performed to validate predicted the speed-dependent stability lobe. © 2011 Elsevier Ltd. Allrightsreserved.


Cao H.,Xi'an Jiaotong University | Cao H.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Li B.,Xi'an Jiaotong University | He Z.,Xi'an Jiaotong University
Advanced Materials Research | Year: 2012

Based on a cutting dynamics model, a new digital machining process model that integrates workpiece quality and machining condition information is proposed, and the mapping relationship between machine tool structural dynamics and product quality information (e.g., dimension error, surface shape) is analyzed in detail. On the basis of the digital machining process model, the condition monitoring and fault diagnosis method of the machining process is investigated, and an implementation flowchart of the method is proposed with explanations of critical techniques. Finally, the proposed model is applied to the condition monitoring and fault diagnosis of the machining process of a CNC end milling machine. The damage of its spindle bearing is detected successfully, which provides the proof for the root cause identification of machining error in the digital machining process.


Shi B.,Beijing Institute of Technology | Wang X.,Beijing Institute of Technology | He K.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment
2010 IEEE International Conference on Automation and Logistics, ICAL 2010 | Year: 2010

A vibration signal analysis system introduced by this paper adopts hybrid programming of Matlab and Delphi, using data file for agency to achieve data communication.The procedure of signal analysis system is written and turned into the independent executable file under the environment of Matlab, which is called under the environment of Delphi. The system combined programming languages of matlab and delphi with comprehensive utilization of powerful numerical calculation processing function of matlab and system exploitation capability of Delphi, which shortens the period of developing system software greatly , saves development costs of exploitation and fully embodies the advantages of the system. © 2010 IEEE.


Yan J.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Yan J.,Hunan University of Science and Technology | Peng Y.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Peng Y.,Hunan University of Science and Technology | And 4 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

The space state mathematical model and utilization rate dynamic model of the concentrator for dish solar thermal power station at any time under rectangular array layout were created using the ray tracing method. And correctness of the model was confirmed by examples, the light blocking characteristics of any concentrator in array in different time were analyzed, and the influence of layout parameters on the concentrator utilization rate was discussed. The results show thated layout intersection angle and layout gap of array in power station are major factor influencing concentrator operating factor, the value of layout intersection angle has a distinct influence on concentrator operating factor while layout gap only can enhance concentrator operating factor at some extent and it has no obvious effect even further increasing the gap. ©, 2015, Taiyangneng Xuebao/Acta Energiae Solaris Sinica. All right reserved.


Yan J.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Yan J.,Hunan University of Science and Technology | Peng Y.-D.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Peng Y.-D.,Hunan University of Science and Technology | And 5 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

Based on Fluent 6.3 software, Navier-Stokes equations with Reynolds time average were chosen to simulate 3D steady wind field of a complex dish frame. Computational domain model satisfying unrestraint flow field and grid independent solutions was built by applying the multi-angle wind modeling method with inner domain subareas of a cylinder. 45-group results of total wind load, wind pressure distribution and flow around characteristics were acquired with simulations. Varying laws of wind load with different working conditions were analyzed. The reasonableness of simulation results was verified with a qualitative comparative analysis between load curves and parabolic radar antenna wind tunnel test results. The ratio of the condenser mirror load to the total wind load of the frame was explored by adopting the dimensionless method. Condenser shape factor distribution and extremes of each subarea load were acquired under typical working conditions. And the load generating mechanism was revealed with further analysis of the flow around characteristics. The study results provided a basis for wind-resistant design of the whole structure of a photo-thermal solar energy dish. ©, 2014, Chinese Vibration Engineering Society. All right reserved.


Tang G.,Hunan University of Science and Technology | Chen A.-H.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Guo Y.-J.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

The nonlinear dynamic equation of a beam with unique cross-section under pure bending vibration was developed. According to theory of nonlinear dynamics, the singular point and stability of the system was studied. Using theory of chaos, the parametric condition of the beam for chaos occurence under pure bending vibration was explored. According to the parametric condition, the parametric condition of a simply supported beam with unique cross-section for chaos occurence under pure bending vibration was studied the parameter boundary for chaos occurence were obtained.


He K.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Zhang Z.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Chen J.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Li Q.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment
Journal of Computers (Finland) | Year: 2012

The ethernet technology is used in multi-arc submerged arc welding systems communicate with each other. The structure of twin-arc high-speed SAW (Submerged arc welding) equipments based on Ethernet is proposed. The welding equipment technical requirement for Ethernet is discussed. The crucial implementations of Ethernet TCP / IP in the welding equipment is presented including designs of ARM (Advanced RISC Machines)- based intelligent control unit, communication program, synergistic controlling procedures and monitoring program of welding process. The results of experiment show that the synergistic controlling for welding process, arc-starting and arc-ending are achieved with the characteristics of high transmission speed, large capacity and reliability. The formation of weld seam is improved with arc stability, and the technology of twin-arc high speed arc welding is achieved. © 2012 Academy Publisher.


Jiang L.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Zeng B.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Jordan F.R.,University of Ottawa | Chen A.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment
Journal of Networks | Year: 2013

Kernel independent component analysis (KICA) is a blind signal separation method which has a good effect for the treatment of non-linear signal. For introducing kernel techniques, the choices of kernel function and its kernel parameter have a great influence on the analytic results. A kernel function and its parameters optimization method is proposed on the basis of the similarity of source fault signals and kernel independent component. The similarity parameter is proposed to verify the merits or defects of KICA by using different kernel function and parameters. The simulation studies are processed, and the simulation conclusion is verified by the actual diagnostic case. These provide guidance for the application of the KICA method in the mechanical fault diagnosis. © 2013 ACADEMY PUBLISHER.


Yan J.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Peng Y.-D.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Yi C.-F.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment | Xiao R.,Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A | Year: 2015

Based on software Fluent6.3, the effects of two disc frames static wind load interference were investigated in a Realizable κ-ε turbulence model. Three kinds of the most unfavorable load conditions in single rack situation were selected, then the interference effects of two racks basic layout forms (serial, parallel and inclined columns) and distances were simulated. The static wind load interference factors of each arrangement interfered frames were obtained, then the change rule of interference factors coincided with the arrangement of the layout form and distance were analyzed and the causes of wind load disturbance on frame were explored through the flow field streamline diagram. The results showed that static wind load factor of tandem downstream disturbed frame was below 1.0, which demonstrated a "shielding effect", whereas the wind load of the upper frame tended to monomer case. Moreover, the interference effects of inclined column layout were also showed a "shielding effect", but weaker than the serial interference. The interference effects between two parallel frames formed a "slit effect", but the effects were not significant. ©, 2015, Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A. All right reserved.

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