外文翻译--虚拟机床的建模和应用(编辑修改稿)

外文翻译--虚拟机床的建模和应用(编辑修改稿)内容摘要：

only helpful for the design process but also for the virtual initial startup of the machine tool or the simulation of the machining operations on the digital model of the machine tool. This technology can be used to set up kinds of machine tool models and the virtual reality environment can provide machine tool learning training. Section 2 covers the modeling of virtual machine tool, which is the ultimate goal in realizing a plete digital model of the machine tool. The Implementation of virtual machine tool is presented in Section 3. The present research challenges which have to be put the virtual machine tool technology into use are discussed in Section 4. The paper is concluded by assessing the effectiveness and future trends in virtual machine tool and machining systems. Proceedings of the 16th International Conference on Artificial Reality and TelexistenceWorkshops (ICAT39。 06) 076952754X/06 $ 169。 2020 2. Modeling of Virtual Machine Tools To systematically generate the structure of machine tools in virtual reality environment in response to different requirements, definitions of ponent modules and the relations between them are structure of machine tools is represented by a connectivity graph. Component modules of machine tool contain the information on size, motion, motion type, etc. and are stored in a module library. Functional and shape characteristics of ponent module are utilized to visualize machine tools on puter and to derive contact and kinematics relations. Contact relations show the linkages between adjacent ponent modules. Various types of feasible machine tools’structure can be derived by applying module bining rules, which regulate the mating feasibility of two ponent modules. Finally, kinematics relations required to show the motions of machine tools can be derived by using functional characteristics of modules and connectivity relations. Figure 2 shows the relationships between the modeling elements of machine tools’ structure [10]. . Geometric Model Based on the virtual machine tool configuration, the shape of the machine tool can be graphically represented. Since the machine tool is a kinematic chain of mechanical ponents, it can be displayed by bining the geometry of the mechanical ponents. Each ponent has a geometrical model including the shape and object coordinate frame, and the machine tool geometry can be generated. Since VMT modeling aims mainly for functionality, rather than exact shaping, the shape of the mechanical ponents can be represented by simple shape elements, such as blocks and cylinders [11]. For instance, bed, column, table, and spindle can be represented by solid blocks, cylinders or a bination. By this way, bed, column, and table are represented by blocks with a translational matrix, spindle is presented by a block with a rotational matrix, and tool by a cylinder and a rotational matrix. By bining the geometric models of the ponents in the world coordinate frame, the plete geometric model of the machine tool can be pletely defined. . Kinematic Model The machine tool is structured as a kinematic chain of mechanical ponents, and functions by the translational and/or rotational movements. To model VMT, the 4 4 homogeneous transformational matrices of kinematics between each pair of ponents are input. The machine tool can be built up by assembling the geometrical units. According to Shin no and Yoshimi[10], the mechanical units of machine tools can be classified into 9 basic mechanical units: spindle, slide, swivel slide, crossslide, column, table, base, column base, and bed, and they can be bined under specific constraints. The mechanical units can be bined to represent the assembly sequence for the kinematic ponents by a certain connectivity graph scheme[11]. 3. Implementation of Virtual Machine Tool Virtual machine tool structural modeler (VMSM) is implemented using OpenGL and VC++ based on the proposed modeling method of machine tools. It can generate easily and quickly initial alternatives of machine tools which satisfies the functions and structures required by user. Consequently, virtual machine tool structural modeler can automate the routine processes needed to design machine tool。