Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing

Changsha, China

Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing

Changsha, China

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Xia Y.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Xia Y.,Central South University | Liu W.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Xue J.,SANY Heavy Industry Co. | And 2 more authors.
Advanced Materials Research | Year: 2011

In the process of shield tunneling construction, the energy consumption is a prominent issue. The disc cutter blade angle, blade tip width and corner radius are taken as design variables, and the minimum cutting special energy consumption as the target, the structural parameter optimization model of disc cutter is established. Genetic algorithm (GA) is used in the mathematical model, and the optimal solution is shown: the disc cutter blade angle is 26°, the blade tip width is 8 mm, and the corner radius is 5 mm. Compared to the actual construction data, the results are satisfactory. © (2011) Trans Tech Publications, Switzerland.


Huang X.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Huang X.,Hunan Normal University | Tan Q.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Xia Y.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Liu W.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing
Advanced Materials Research | Year: 2011

The structure and characteristics of test signals of the experimental device for cutter head in shield machine are analyzed. Based upon this analysis, Profibus-based control system is designed. With the use of a distributed I / O station on-site analog signal, the problems of anti-interference for long-distance transmission of signals are resolved, and high-speed transmission for sensor signals and control signals are realized. © (2011) Trans Tech Publications.


Xia Y.M.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Zhou X.W.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Xue J.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Luo D.Z.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing
Advanced Materials Research | Year: 2010

With the comprehensive use of finite element and computer simulation, the cutter-head was analyzed and optimized. Based on the full analysis of structural features of the cutter-head, the finite element analysis model of the cutter-head was set up by using Solidworks and ANSYS. The analyses of the cutter-head under two kinds of limit load conditions were carried out and the stress distribution of the cutter-head was obtained. According to the tunneling characteristics, the cutters were re-arranged. The analysis showed that under the same conditions, the stress distribution of the improved structure was more symmetrical and the maximum stress and maximum deformation also had a remarkable reduction. Also there was a greater stress between the corbel and the flange; it would be of vital significance to increase the welding strength of these parts. And the results could provide basic data for the structure design of cutter-head. © (2010) Trans Tech Publications.


Li J.,Central South University | Li J.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Deng L.,Central South University | Deng L.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | And 8 more authors.
Microelectronics Reliability | Year: 2011

It is indicated that the impact and deflection of overhang die during overhang bounding process results in considerable impact of performance of bonding in this paper. Specifically, the deflection is unstable and up to 27 μm for the given parameters, which results in low shear force strength and low success rate of overhang bonding. To improve the performance of the overhang bonding, an effective and novel approach, overhang bonding with thick Al, is presented. The approach decreases hardness of bonding die, which makes the bonding die more compliant during bonding process than that in the traditional approach, thus the shear strength and bonding success rate of overhang bonding will be improved. Finally, effects of ultrasonic and force to overhang bonding indicates that excessively low or excessively high ultrasonic power results in weak bonding performances, and so did the force. © 2011 Elsevier Ltd. All rights reserved.


Li J.,State Key Laboratory of High Performance and Complex Manufacturing | Li J.,Central South University | Li J.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Ma B.,State Key Laboratory of High Performance and Complex Manufacturing | And 8 more authors.
Microelectronics Reliability | Year: 2011

To improve the heat dissipation of high-power light-emitting diodes (LEDs), a cooling system with thermoelectric cooler (TEC) is investigated. In the experiment, the 6 × 3 W LEDs in two rows are used to compose the light source module and the environment temperature is 17 °C. The temperatures of heat dissipation substrate of LEDs and cooling fins of a radiator are measured by K type thermocouples to evaluate the cooling performance. Results show that the temperature of the substrate of LEDs reaches 26 °C without TEC. However, it is only 9 °C when the best refrigeration condition appears. The temperature of the substrate of LEDs decreases by 17 °C since the heat produced by LEDs is absorbed rapidly by TEC and dissipated through the radiator, and the junction temperature of LEDs reaches only 45 °C which is much lower than the absolute maximum temperature of LEDs (120 °C). The experiment demonstrates that the cooling system with TEC has good performance. © 2011 Elsevier Ltd. All rights reserved.


Wang A.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Wang A.,Central South University | Huang H.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Huang H.,Central South University
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

A simulation test method which can be used to study dynamics characteristices of complex bladed disk systems was advanced based on the bond graph which is an effective tool for modeling of systems with multi-energy domains. The bond graph mode and the dynamic test model of bladed disk was established. The dynamics characteristices can be derived efficiently, conveniently and intuitional when the method was utilized to dynamics simulation test of complex mechanical systems, so new idea and methods have been provided for dynamics research of complex mechanical systems.


Zhu Z.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Zhu Z.,Changsha University | Xia Y.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Xia Y.,Central South University | And 2 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

In order to solve the problems of data access and low accuracy on the shield tunnelling machine construction site, a test bed that can simulate the shield tunnelling machine cutter head's cutting performance is designed. The test bed's box uses a fixed cutter head and a turning material bin. The whole configuration is designed to a welding framework. The cutter head is designed to a spoke form. The fixing angle and the distance between different cutters can be adjusted at random. The propelling and loading system of the test bed are controlled in an electro-hydraulic proportional control manner. It can be used to test the single factor and multiple factors that influence the cutter head's cutting performance. © 2010 Springer-Verlag.


Junhui L.,Central South University | Junhui L.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Ruishan W.,Central South University | Ruishan W.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | And 6 more authors.
Solid State Sciences | Year: 2011

Interfacial microstructures of thermosonic Au wire bonding to an Al pad of die were investigated firstly by high-resolution transmission electron microscopy (HRTEM) and X-ray micro-diffractometer. The equal-thickness interference structures were observed by HRTEM due to diffusion and reaction activated by ultrasonic and thermal at the Au/Al bond interface. And X-ray diffraction results showed that three different interplanar crystal spacings ('d' value) of the interfacial microstructures were 2.2257 , 2.2645 , and 2.1806 respectively from the high intensity of diffraction to the low intensity of diffraction. These indicated that the intermetallic phase AlAu2 formed within a very short time. It would be helpful to further research wire bonding technology. © 2010 Elsevier Masson SAS. All rights reserved.


Lin Y.C.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing | Liu G.,Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing
Computational Materials Science | Year: 2010

Numerical simulations can be truly reliable only when a proper material flow stress relationship is built because of its effective role on metal flow pattern as well as the kinetics of metallurgical transformation. Based on the hot compressive deformation behaviors of 42CrMo steel, a comprehensive constitutive model has been developed to predict stress-strain curve up to the peak stress. A new material parameter L, which is sensitive to the forming temperature and strain rate, was proposed in the developed constitutive model. Additionally, the mathematical models to predict peak stress and peak strain were established based on experimental results. The stress-strain values predicted by the developed model well agree with experimental results, which confirmed that the developed constitutive equation gives an accurate and precise estimate for the flow stress of 42CrMo steel. © 2009 Elsevier B.V. All rights reserved.

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