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The fatigue limit and S-N curve is the important parameter which stand for fatigue performance of the metal material, so it was discussed all along that how to estimate the fatigue limit and make S-N curve quickly and accurately, P-S-N curve is the foundation of analysis and design on structure fatigue reliability.
Acknowledgements This work was supported by the Natural Science Foundation of jiangsu province (BK2011261).
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If the stress exceeded the yield limit of the material of part, the milling area of the needle body would be create plastic yield.
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Cutting forces measurement tests on Q235 steel workpiece material during broaching had been performed.
After turning, the surface roughness is near 1.6μm, thickness of the removed material from the workpiece is more than 25mm.
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Vibration Fault Diagnosis of Rotating Machine based on the Principle of Entropy Increase Chen Yu1,a, Jianlan Li*1,b and Shuhong Huang1,c 1Department of Energy Engineering and Power Engineering, Huazhong University of Science & Technology, Wuhan, P.R.China ayuchen880318@163.com, bhust_ljl@hust.edu.cn, cshhuang1@mail.hust.edu.cn Keywords: Rotating machine, vibration fault diagnosis, fusion information entropy, entropy increase Abstract.
Analysis of vibration fault diagnosis of rotating machine 6 typical vibration faults discussed in this paper are imbalance (IB), misalignment (MA), oil whirl (OW), shaft cracking (SC), pedestal looseness (PL) and impact and rub (IR) which come from the vibration fault simulator in Huazhong university of Science & Technology, shown in Fig. 1.
Acknowledgment This work was financially supported by the National Natural Science Foundation of China (project No. 50975105) and the National Basic Research Program of China (project No. 2009CB219803).
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Table 2 Comparison of pushing force with different materials D 108 x12R400 Pushing force (N) Bending moment 45° 90° 135° 180° Materials 20G 166477 167269 166774 165551 P91 290754 292347 288689 290186 a) Moment with 20G b) Moment with P91 Fig. 3 Comparison of bending moment with different materials a) Pushing force of material 20G b) Pushing force of material P91 Fig. 4 Comparison of pushing force between different materials Sectional Strain of Tube A and Tube B.
a) Sectional strain with material 20G b) Sectional strain with material P91 Fig. 5 Comparison of sectional quality with different materials We can compare sectional quality with different materials in Table 3.
Yu: Applied mechanics and Materials, Vol. 10-12 (2008), pp. 172-176
Yu: Submitted to Key Engineering Materials, (2008)
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Experimental Materials The sewage sludge used in the experiment was taken from the dehydration room of Lanzhou Yan Erwan Sewage Treatment Plant.
Based on references and experimental results that have been obtained, the best C/N ratio of raw composting materials was from 25 to 35.
Due to the fact that the C/N ratio of sludge ranged from 5 to 8 and the ratio of sawdust was about 200, the dry mass ratio 7:1 of the both materials was determined.
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