Lv L.,China Institute of Technology |
Song Y.T.,Dalian Huarui Heavy Industry Group Co. |
Zhang S.F.,Dalian Jiaotong University
Applied Mechanics and Materials | Year: 2014
The level of an enterprise's process management related to its existence and development tightly, in order to evaluate it accurately, the evaluation index system was presented, which was formed by 10 first level indexes and 39 second level indexes, in which the latter is the meticulous and materialization of the former. The methods of evaluation by total marks, weighting comprehensive evaluation on multi-index system and fuzzy comprehensive evaluation were applied to the process management. Compared with the other two ways, the fuzzy comprehensive evaluation is more accurate and comprehensive since it settle the quantification of the nature indexes during the analysis process, and it also solve the multi-factors evaluation who have different unit. © (2014) Trans Tech Publications, Switzerland.
Wang X.-W.,China University of Mining and Technology |
Wei L.-B.,China University of Mining and Technology |
Sun D.-Q.,Dalian Huarui Heavy Industry Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013
Established undamped mechanical model and mathematical model of horizontal vibrating centrifuge. The main vibration spring stiffness gets lower due to the temperature rise of bearing, which leads to amplitude-frequency characteristic curve change, shell and screen-basket amplitude instability. Found the fixed point on the screen-basket amplitude-frequency characteristic curve is not affected by the main vibration spring stiffness. Combined with the antiresonant frequency in the case of higher temperature of bearings, in order to stablize the amplitude of screen-basket and the minimum amplitude of shell and the less stress of the main vibration spring, and put forward that the system natural frequency of shell and vibration frequency is equal and slightly lower than natural frequency of the screen-basket, and verify such conclusion by experiments.
Zhang C.,Dalian University of Technology |
Qu F.,Dalian University of Technology |
Xie Z.,Dalian University of Technology |
Xie Z.,Shenyang Jianzhu University |
Chai R.,Dalian Huarui Heavy Industry Group Co.
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2016
Based on the differential equation of an elastic curved surface and the corresponding relation between cutter-head deformation and hob load, we established a theoretical value range for the tunnel boring machine (TBM) cutter-head support diameter when considering different support forms. On the basis of the similarity theory, we designed a reduced-scale structural model of a certain TBM cutter-head, and recorded the load of the measurement point for different support diameters. We employed a nonlinear spring element to simulate the interaction between the hob and rock, and the finite element method results were consistent with the value distribution and change law measured experimentally. The results show that when cutter-head support lies between a simple and clamped support, the theoretical ratio between the support diameter and cutter-head diameter is in the range of 0.444 to 0.707. In addition, a change in the support diameter significantly impacts the load of the front and central hobs, while the influence on the side hob is relatively small. As the support diameter increases, both the load variation coefficient and the maximum load of the front hob increase. © 2016, Harbin Institute of Technology. All right reserved.
Cui J.,Shenyang University of Technology |
Yang J.,Shenyang University of Technology |
Xing Z.,Shenyang University of Technology |
Li Y.,Shenyang University of Technology |
And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2015
Due to the wind power time-varying and intermittent characteristics, it is difficult to achieve real time energy balance in a power system. Hence, accurate and stable power forecast will make wind energy a schedulable energy. To deal with wind power uncertainties, a multi-scenario power forecasting method based on the optimal fitting wind power curve for single turbine is proposed. Firstly, atmospheric movement model is discretized using computational fluid dynamics (CFD) speedup matrix, which can reflect wind flow distribution accurately. Secondly, a new variable-weight CFD wind forecast combination method for each wind turbine is put forward considering rotor thrust coefficient of free flow field and wakes of actuator disc. Finally, a new site-specific optimal power curve fitting method is developed based on historical data of wind speed and power measured by wind turbine's anemometers. The contribution rate is the basis of eliminating illegal points by use of iterative algorithm. The engineering applications show that the proposed method can effectively improve the accuracy of wind power curve fitting and forecasting. ©2015 Automation of Electric Power Systems Press
Han Y.-L.,Shenyang University of Technology |
Ding J.,Shenyang University of Technology |
Liang Z.-Q.,Dalian Huarui Heavy Industry Group Co.
Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology | Year: 2013
In order to overcome the failure phenomenon of parts caused by friction and abrasion which often exists in industrial production process, the problem concerning the abrasion resistance of material surface was researched. Through adopting the lining-ceramic technology with redundant heat of molten steel, the ceramic compound powders were sintered on the surface of casting steel with the heat dissipated from molten steel, and the lining-ceramic layer with high abrasion resistance was formed. The results of abrasion experiments reveal that the weight loss rate of lining-ceramic layer is as 1/80 as that of 45# steel. The microstructure of the layer was analyzed with scanning electron microscope (SEM). It is found out that the ceramic particles homogenously distribute in the metal matrix, and are tightly clasped by the matrix metal. The analysis indicates that the ceramic particles can bear most loads in the friction process, and such microstructure feature is one of the important factors for the great improvement in abrasion resistance.
Sha Y.,Beijing Institute of Petrochemical Technology |
Liu J.,Dalian Huarui Heavy Industry Group Co.
Proceedings - 2013 2nd International Symposium on Instrumentation and Measurement, Sensor Network and Automation, IMSNA 2013 | Year: 2013
It is urgent to find an automatic method of an automatic orientation calculation on the large-scale text in Chinese. Rather than comment their orientation directly in comment texts, people may express their orientation on topic by describe its features using orientation words. The describe word on features indicated their orientation. The orientation of comments on object is called topic orientation. Although the word orientation, also called word polarity, is the foundation for the text orientation analysis, the sentence structure also should be considered in this process. In this paper, text topic orientation is calculated by not only word orientation, but also sentence structure, and an Emotion Submission algorithm is proposed to calculate the sentence topic orientation. This method is suitable for goods comments. The experiment results show that the proposed algorithm is reasonable. © 2013 IEEE.
Li Z.,Dalian Huarui Heavy Industry Group Co. |
Chen Y.,CSIC Dalian Marine Information System Co.
2013 The International Conference on Technological Advances in Electrical, Electronics and Computer Engineering, TAEECE 2013 | Year: 2013
The computer technology has been applied widely on mechanical engineering design and project management. For wind power industry, the computer technology is always applied by computation and simulation on wind turbine gearbox design. The professional computer software tools can simulate the actual running situations of the gear rating and transmission of the gearbox before manufacturing and prototype testing. This paper proposes the relevant analysis regarding computer technology application on wind turbine gearbox design, and presents the essential auxiliary function of computer simulation of some particular software tools for gearbox operation, gear rating and transmission drive train on wind turbine gearbox design. © 2013 IEEE.
Kan X.-Y.,Dalian Jiaotong University |
Liu P.-T.,Dalian Jiaotong University |
Zhou M.-Y.,Dalian Jiaotong University |
Zhou M.-Y.,Dalian Huarui Heavy Industry Group Co. |
And 3 more authors.
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | Year: 2015
Water Cavitation Jet (WCJ) of varied time was used on the surface of pure titanium under the pressure of 30 MPa. The surface morphology, microstructure and surface roughness of the test specimens were analyzed by optical microscope and scanning electron microscope after the WCJ treatment. The cavitation erosion on the surface of pure titanium was investigated at the same time. The results show that the damage zone is divided into the direct cavitating water jet damage zone and the mixed cavitating water jet damage zone according to the cavitation erosion damage degree and the characteristics of submerged water jet. In the direct cavitating water jet damage zone, some pits of plastic deformation, needle shaped cavitation erosion and twin of deformation appear on the surface of pure titanium in 5 minutes. With the increase of shot peening time (20-30 min), cracks start to initiate and extend in the twin boundaries. A great deal of metal flakes off, and the surface roughness increases obviously in 60 minutes. The damage rate in the mixed cavitating water jet damage zone is significantly lower than that in the direct cavitating water jet damage zone, however, the twin layer of the mixed cavitating water jet damage zone is thicker and denser than that in the direct cavitating water jet damage zone in the cross-sectional microstructure. The hardening layer of the direct cavitating water jet damage zone is thinner than that of the mixed cavitating water jet damage zone. The fastest rising stage of the surface roughness is from 5min to 30min of cavitating water jet treatment. The rising rate of the surface roughness slows down after 30min and the surface roughness reaches 2.92μm after 60 min. ©, 2015, Chinese Journal of Aeronautics. All right reserved.
Shen D.,Yanshan University |
Cai J.,Yanshan University |
Guo C.,Yanshan University |
Liu P.,Dalian Huarui Heavy Industry Group Co.
Chinese Journal of Mechanical Engineering (English Edition) | Year: 2013
Most researches on micro-arc oxidation mainly focus on the application rather than discovering the evolution of residual stresses. However, residual stresses in the surface coatings of structural components have adverse effects on their properties, such as fatigue life, dimensional stability and corrosion resistance, etc. The micro-arc oxidation ceramic coatings are produced on the surfaces of 6061 aluminum alloy by a homemade asymmetric AC type of micro-arc oxidation equipment of 20 kW. A constant current density of 4.4±0.1 A/dm2 and a self-regulated composite electrolyte are used. The micro-arc oxidation treatment period ranges from 10 min to 40 min, and the thickness of the ceramic coatings is more than 20 μm. Residual stresses attributed to γ-Al2O3 constituent in the coatings at different micro-arc oxidation periods are analyzed by an X-ray diffractometer using the sin2ψ method. The analysis results show that the residual stress in the ceramic coatings is compressive in nature, and it increases first and then decreases with micro-arc oxidation time increase. The maximum stress value is 1667±20 MPa for period of 20 min. Through analyzing the coating thickness, surface morphology and phase composition, it is found that the residual stress in the ceramic coatings is linked closely with the coating growth, the phase composition and the micro cracks formed. It is also found that both the heat treatment and the ultrasonic action release remarkably the residual compressive stress. The heat treatment makes the residual compressive stress value decrease 1378 MPa. The ultrasonic action even alters the nature of the residual stress, making the residual compressive stress change into a residual tensile stress. © Chinese Mechanical Engineering Society and Springer-Verlag Berlin Heidelberg 2013.
Sun J.,Yanshan University |
Peng Y.,Yanshan University |
Gao Y.,Yanshan University |
Jia F.,Dalian Huarui Heavy Industry Group Company
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015
Strong vibration occurred on some hot rolling mills when the thin strip was rolled, in order to determine the type and the cause of the vibration, simulation and test were carried out. First, the natural frequencies and the vibration modes of horizontal vibration and main drive system were calculated, and then the online testing was conducted on the main drive system and rolls of F2 mill. The horizontal vibration of the rolling mill was the most violent, and caused the vertical vibration and torsional vibration, so the influences of the strip thickness and the offset of work roll and backup roll on the horizontal vibration were simulated and analyzed. The results show that when the strip thickness is thinner, the backward tension and the rolling force are more unstable, and the influence on the horizontal vibration is larger; when the offset of work roll and backup roll increase, the horizontal vibration decreases, and the adjusted time decreases, but the offset should not be too big. Adding a shim with thickness of 0.7 mm between the roll bearing chock and the frame can reduce the gap and resist vibration effectively. © 2015, Central South University of Technology. All right reserved.