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The most typical interference: global interference-cutting tools collide the other parts of surface when tools processing surface; local interference work piece materials are over-cutting or under-cut.
Fig.8 Ball-end cutter processing free surface simulation process Fig.9 Actual processing Acknowledgements This thesis is supported by the Fund of AVIC Aeronautics Science and the State Key Laboratory Foundation of Educational Department of Liaoning Province.
Liu: Chinese Journal of Mechanical Engineerin, Vol. 42, No. 6, (2006), p. 177 [6] J.
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The Experimental Study on Creep and Shrinkage of  High Strength Concrete with Fly Ash Jian-qun Wang 1, a, Zhi Fang 2,b and Zhijian Tang 3,c 1 Department of Civil Engineering, Hunan Univ of Science & Technology, Xiangtan, Hunan, China 2 Department of Civil Engineering, Hunan Univ, Changsha, Hunan, China 3Guangxi Airport Management Group Co.
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Materials adopted in the design were Q235B low-carbon steel for steel members and C20 concrete for floor slab.
Acknowledgements This work was financially supported by Ministry of Science and Technology of China (2004EG131165).
Goel, “Dynamic analysis of staggered truss framing system” Journal of the Structural Division, 1972, 98(7), 1475-1492
Itani, “Seismic behavior of open-web truss-moment frames”, Journal of Structural Engineering, 1994, 120(6), 1763-1780
Itani, “Seismic-resistant special truss-moment frames”, Journal of Structural Engineering, 1994, 120(6), 1781-1797

Acknowledgement It is a project supported by the International Science & Technology Cooperation Program of China, （No. 2011DFB60150）.
[2] Rui Quan, Shuhai Quan, Liang Huang et al: Journal of Shanghai Jiaotong University, Vol. 45(2011), p. 842-846+850, in Chinese
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International Journal of Information Technology,2005,11(1):16-24
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Experimental study and the theoretical model of optical flowmeter of solid debris. chinese journal of mechanical engineering, 2004, 40(8):160-165
Chinese Journal of Scientific Instrument, 2013,34(4):762-767 [4] X.
Journal of Nanomaterials, 2014, 2014
Study on the resolution-frequency characteristic of microfluidic oil detection chip, Chinese Journal of Scientific Instrument. 2014,35(2),427-433 [6] H.
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Introduction With the development of technology and filtration materials, the filtration technology has a great improvement.
Joubert [4]etc studied filtration pressure drop through wet filter layer of The high efficiency air particle filter; Hai-ming Fu [1] have taken orthogonal experiment and regression analysis on the pressure drop of fixed bed particle filter; Fang Xu [5] analysised the existing experience and half experience formula and revised them, then got filtering pressure drop theory calculation formula with good robust; Chang-yong Yan [6] showed the experiment showed the trend of the influence of the filter material to the filtration pressure drop by taken an experiment; Xiao-yan Gao [7] studied the pressure , velocity, and particle distribution of gas through Electrostatic fabric fiber by CFD simulation.
Vahedi Tafreshi: Chemical Engineering Science.
Pourdeyhimi: Chemical Engineering Science, Vol.65(2010), pp. 5285–5293 [4] A.
Bouillouxa: Chemical Engineering Journal, Vol.166(2011), pp. 616-623 [5] Xu Fang, Fu Haiming: Journal of Filtration & Separation, Vol.4(2008), pp. 30-33 [6] Yan Changyong, Shen Henggen: Industrial Safety and Environmental Protection, Vol.32，No.1(2006), pp. 3-5(In Chinese)

The problem description Fig. 1 A simply supported beam As shown in Fig1, a simple-supported beam with the same square cross – section, the beam length is , the height of the cross – sections is ,elasticmodulus E=200 , poisson’s ratio of the material , the density of thematerial ,linear damping factor, the power spectral density of random pressure density is Solving the response spectrum of the maximum displacement point and the displacement power spectral density function , the velocity power spectral density and the acceleration power spectral density function of the maximum displacement point.
Journa l ofGuizhou Educati on Institute (Natural Science) Vo. l 18 .
The magneto-elastic random vibration of a electroconductive beam in a magnetic field.Journal of Vibration and Shock,. 2007(3) [4] Jianmin Xiong Junrong Zhou Jinzhi Zhou.
Research of Pre-stress Simple-supported Beam’s Natural Frequency Based on Ansys Chinese Journal of Solid Mechanics Vol.29 S.Issue December 2008 [5] Ma shilin,Fu renben. mechanics of materials, Machinery Industry Press,1996,11 [6] R.W.Clough.J.
[M]Beijing: Science and Technology Press,1982.

The method of duplicating internal cavity is copying the internal shape with silicon rubber and other elastic material characterized low melting and rapidly solidified, which be injected in the valve body and taken out Fig. 1 The valve body with internal cavity after solidification easily, the external surface of the entity is regarded as the internal cavity so that it can be measured expediently and easily.
A technical trick can be used in this process because of the softer silicon rubber, a clava is inserted in internal cavity filled with liquid silicon rubber, it can not only reduce the material consumption, but also decrease deformation of silicon rubber entity.
The next step is cutting out the material entity of the internal cavity based on the solid model created above according to the curves of the internal surface, which is also imported in the CAD software.
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