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DIRECT AND ADAPTIVE SLICING ON CAD MODEL OF IDEAL FUNCTIONAL MATERIAL COMPONENTS (IFMC)

Chinese Journal of Mechanical Engineering 2005年第1期18卷 139-144页

作者： XuDaoming jiazhenyuan GuoDongming KeyLaboratoryforPrecisionandNon-traditionalMachiningTechnologyofMinistryofEducation DalianUniversityofTechnologyDalian116024.China

A brand new direct and adaptive slicing approach is proposed, which canapparently improve the part accuracy and reduce the building time. At least two stages are includedin this operation: getting the crossing contour of the cutting plane with the solid part anddetermining the layer thickness. Apart from usual SPI algorithm, slicing of the solid model has itsspecial requirements. Enabling the contour line segments of the cross-section as long as possible isone of them, which is for improving manufacturing efficiency and is reached by adaptively adjustingthe step direction and the step size at every crossing point to obtain optimized secant height. Thelayer thickness determination can be divided into two phases: the geometry-based thicknessestimation and the material-based thickness verifying. During the former phase, the geometrytolerance is divided into two parts: a variety of curves are approximated by a circular arc, whichintroduces the first part, and the deviation error between the contour line in LM process and thecircular arc generates the second part. The latter phase is mainly verifying the layer thicknessestimated in the former stage and determining a new one if necessary. In addition, an example usingthis slicing algorithm is also illustrated.

关键词： Rapid prototyping Ideal functional material components Direct and adaptiveslicing Surface/plane intersection Marching

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PHYSICS-BASED ILLUMINATION MODEL FOR METAL SURFACE RECONSTRUCTION IN RE

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Chinese Journal of Mechanical Engineering 2004年第4期17卷 556-559页

作者： GuoDongming HaoPing KangRenke jiazhenyuan Non-traditionalMachiningofMinistryofEducation DalianUniversityofTechnologyDalian116023.China

Representation of roughness is introduced and the rationality of applying thephysics-based model in RE is analyzed at first. Then the scattering theory of electromagnetic waveis simplified and deduced to a physics-based model according to the characteristics of the surfaceto be reconstructed in RE. At last, the intensity diagrams of reflected field distribution areprovided to prove the feasibility of the presented model and some spheres are rendered with thismodel.

关键词： Illumination model Reverse engineering Surface reconstruction Computervision

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DEVELOPMENT OF THE CONTROL METHODOLOGY OF THE GIANT MAGNETOSTRICTIVE ACTUATOR BASED ON MAGNETIC FLUX DENSITY

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Chinese Journal of Mechanical Engineering 2003年第4期16卷 359-362页

作者： jiazhenyuan YangXing ShiChun GuoOongming SchoolofMechanicalEngineering DalianUniversityofTechnologyDalian116024China DepartmentofPrecisionInstrumentsandMechnology TsinghuaUniversityBeijing100084China SchoolofMechanicalEngineenng DalianUniversityofTechnologyDalian116024China

According to the principle of the magnetostriction generating mechanism, thecontrol model of giant magnetostriction material based on magnetic field and the control method withmagnetic flux density are developed. Furthermore, this control method is used to develop a giantmagnetostrictive micro-displacement actuator (GMA) and its driving system. Two control methods whosecontrol variables are current intensity and magnetic flux density are compared with each other byexperimental studies. Finally, effective methods on improving the linearity and control precision ofmicro-displacement actuator and reducing the hysteresis based on the controlling magnetic fluxdensity are obtained.

关键词： Giant magnetostriction Magnetic flux density Control method Micro-displacement actuator

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