Wang Y.,Dalian Jiaotong University |
Qu L.,Dalian Huarui Heavy Industry Group Co. |
Li H.,Dalian Jiaotong University |
Zhang H.,Dalian Jiaotong University |
Lu Y.,Dalian Jiaotong University
Materials Transactions | Year: 2017
The cooling rate with which the liquid is cooled has tremendous impact on the macroscopic properties of amorphous solids, but little information on the underlying mechanism for this dependence is available, mainly due to the lack of clear characterization on the microstructural variation induced by cooling rate. We built a colloidal glass to obtain its direct three-dimensional configuration by using laser scanning confocal microscopy and investigate the effect of cooling rate on microstructure. By quantifying coordination numbers and bond-angle distribution, we give evidence that the icosahedral-like structure is the most frequent local structure and more favored by the lower cooling rate. © 2017 The Japan Institute of Metals and Materials.
Yang Z.,Dalian Jiaotong University |
Tao W.,Harbin Institute of Technology |
Zhao X.,Dalian Huarui Heavy Industry Group Co. |
Chen Y.,Harbin Institute of Technology |
Shi C.,Dalian Jiaotong University
International Journal of Advanced Manufacturing Technology | Year: 2017
In this study, a three-dimensional model was developed to investigate the temperature fields during a double-sided laser welding process of T-joints, and the correlations between the thermal characteristics and the mechanical properties were researched in details. To verify the modelling results, welding experiments were conducted with two different welding parameters and the geometrical dimensions of the weld pool were measured. It was found that there was a good agreement between the calculated and the measured results. The calculated results showed that the temperature profile was bilateral symmetry along the stringer centre, and the temperature gradient became greater as running far from the stringer centre, especially on the skin side. All of the tensile specimens were fractured along the fusion line on the skin panels for the head and the hoop tensile tests. The loss of the alloying elements near the fusion line on the skin side resulted in the lowest micro-hardness value appeared here, and made it to be the weakest region of the welded T-joints. The calculated thermal cycles indicated that the materials closest to the fusion line on the skin side had been staying at higher temperature for a longer time, and which is the essential reason for the fracture behaviour, micro-hardness distribution and alloying elements distribution of the double-sided laser welded T-joint. © 2017 Springer-Verlag London
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.
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.