煤炭学报(英文模板)

JOURNAL OF COAL SCIENCE & ENGINEERING (CHINA) DOI 10.1007/s12404-011-0101-9 pp 1–5 Vol.17 No.1 Mar. 2011

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Research on virtual dynamic optimization design for NC machine tools *

HU Ru-fu 1,2, CUI Zhong-hua 1, CHEN Xiao-ping 1, SUN Qing-hong 2

1. School of Transportation and Traffic, Ningbo University of Technology, Ningbo 315016, China

2. Department of Mechanical Engineering, Southeast University, Nanjing 210096, China

© The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg 2011

Abstract In order to obtain the distribution rules of abutment pressure around the 1151(3) fully mechanized top-coal caving (FMTC) face of Xieqiao Colliery, the KSE-Ⅱ-1 type bore-hole stress gauges were installed in the tailentry and headentry to measure the mining-induced stress. The distribution rules of the front and side abutment pressure were demonstrated. The re-sults show that distribution rules of stress are obviously different in the vicinity of the face and entries. The peak value of abutment pressure in the protective coal pillar and face are located commonly in front of the working face along the strike, and they are located at the stress-decreased zone near the face. There is no stress peak value in the lateral coal mass beside the headentry in front of the face on the strike, and the peak value of abutment pressure appears at the rear area of the face. There are stress peak values both in the protective coal pillar and in the lateral coal mass beside the headentry to the dip. Keywords fully mechanized top-coal caving face, abutment pressure, in-situ measurement

Received: 26 June 2010

* Supported by the National Natural Science Foundation of China (50375026); the National Natural Science Foundation of China (50375028)

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Introduction

Conventional products development requires the processes of designing, trial-manufacture of the physi- cal prototype, test, modification, retrial-manufacture, and so on. This causes long time consuming and high cost. With the rapid development of the computer technology and its widened application to mechanical engineering, new thought, new concept, and new mode of the advanced manufacture technology emerge in endlessly. The high technology, represented by computer technology and information technology, is playing an important role in the mechanical manufac-turing. The products design and development are de-veloping towards the direction of 3D and simulation (Xu et al., 2001). The main advantages of using 3D software to design and develop products are real-time judge of products crafts, products assembling, and products making. Because 3D designing software al-ways adopts the characteristic-based parameterized modeling methods, so, it is very easy to modify the structure characteristics of 3D virtual parts, leading to meet requirements of products assembling, products making, and dynamic capability. By use of the virtual assembling technology, we can obtain 3D virtual pro-totype. And, through simulation analysis and interfer-ence inspection, we can modify and perfect designing schemes.

The virtual optimization design of mechanical structure, based on computer modeling and the simu-lation technology, integrates with computer graphics, mechanical kinetics, finite element analysis, and opti-mization design. It is a multiple subjects integrated synthetically technology, and it is a digitized image mapping of the designing technology for mechanical structure dynamics under the computer environment. This paper has established the entire thought and flow of the dynamic virtual design of mechanical structures. Taking the NC machine tools as the project example, and the method of virtual dynamic optimization design is analyzed and implement.

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