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Experimental and FEM Modal Analysis of Workbench for PCB Drilling Machine Hongqun TANG1,2,a, Chengyong WANG*1,b, Bing WANG1,c,Lixin HUANG1,3,d, Shanshan HU 2,e, Zhishun CHEN 1,f 1 Guangdong University of Technology, Guangzhou, P.R.China 2 Key laboratory of new processing technology for nonferrous metals and materials, Ministry of Education, Guangxi University, Nanning, P.R.China 3 Shanghai University of Engineering Science, Shanghai, P.R.China a tanghongqun@126.com, bcywang@gdut.edu.cn, csupbing@163.com, dhlx_1067@163.com, e chloee_2000@163.com, f316370200@qq.com Keywords: Workbench for PCB drilling machine, Natural frequency, Damping ratio, Vibration mode Abstract.
The material of X-axis and Y-axis workbenches are granite.
Acknowledgements This study was supported by National Science Foundation - Guangdong Province Foundation, China (No.
U0734007) and Foundation of Key laboratory for new processing technology for nonferrous metals and materials, Ministry of Education, Guangxi University, China (No.
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For CFST members, initial defects and shrinkage make poor concrete-steel interface bond and even local separation between the two materials.
In alphabetical order ‘e’, ‘f’ and ‘g’, the expansive agent account for 12% of the cement materials based on the mixes ‘a’, ‘b’ and ‘c’.
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Lăzărescu dealt closely with the study of metal cutting processes, the construction of cutting tools and the phenomenon of vibrations in the cutting process (“Processing of metal materials by cutting”, Technical Publishing House 1972).
The insert material was cermet.
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Series: Journal of Physics: Conf.

As illustrated in Figs. 1a and b, two kinds of stress-strain curves are assumed for tube materials.
It is also difficult to know the accurate stress-strain curve for tube materials considered.
Fisher, "Steam Generator Fretting-Wear Damage: A Summary of Recent Findings," Journal of Pressure Vessel Technology, Vol. 121 (1999), pp. 304-310
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POPs content in soil of the original sealing place was 20 to 100 times more than the natural material content [8].
Industries producing solid waste mainly include coal mining industry and washing industry, ferrous metal mining industry and selecting industry, non-metallic mineral products industry, ferrous metal smelting industry, nonferrous metals separation industry; industries generating wastewater mainly contain paper making industry and paper products industry, chemical raw materials industry and chemicals manufacturing industry, production and supply industry of electricity and heat, food industry, tobacco industry, beverage industry, and textiles industry [19]; Industries producing waste gas mainly consist of production and supply industry of electricity and heat, ferrous metal smelting and calendering processing industry, non-metallic mineral products industry, chemical raw materials industry and chemicals manufacturing industry, nonferrous metal smelting and calendering processing industry.
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Zhan c School of Materials Science and Engineering, Northwestern Polytechnical University, P.O.
However, power spinning of parts with inner rib is a complex physical process with multi-factor coupling interactive effects, where the metal flow is influenced by many factors in the forming process, such as materials parameters, processing parameters, and geometry sizes and shape of blank.
Acknowledgements This research is supported by the National Science Found of China for Distinguished Young Scholars(No.50225518)and the National Natural Science Foundation of China (No. 50405039 and 50575186), and authors wish to express their gratitude.
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Acknowledgment This study was financially supported by the UP OVRCD Outright Research Grant, National Research Council of the Philippines (NRCP) research grant, and in part by the DOST’s grants for outstanding achievements in Science and Technology through the National Academy for Science and Technology (NAST).
Solid-State Synthesis and Characterization of Li7-3xGaxLa3Zr2O12 Solid Electrolyte for Li-ion Battery Application, Key Engineering Materials Journal, 705 (2016) 145-149
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ZnO nanostructures are also a piezoelectric material that can be used in sensor and transducer application.
Metal oxide semiconducting materials are selected to make sensors due to their small dimension, low cost, low power consumption, simple processing and stability.
The conductivity of a metal oxide semiconducting material can be improved by introducing a doping material.
Nitrogen dopant is more efficient than other elements and is used in metal oxide semiconductor to increase the conductivity and to produce p-type conductor materials because nitrogen contributes an excess number of holes for conduction by forming an N-Zn(O)-N complex [1].
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Materials used to induce snap-through include shape memory alloys [8,9], which can induce high strains (8%) at low frequency [10] and piezoelectric materials that are able to generate high forces at high frequency, although the developed strains tend to be small; typically only 0.1-0.4%.
Due to the lower stiffness and greater curvature of the thin composite, 28mm x 14mm piezoelectric macro-fibre composite (MFC) actuators from Smart Materials Corp., USA (Actuator no.
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