现代机械工学(虚拟机床).ppt

Outlines Demands for Modern Machine tools Concepts and Definitions VMT vs. Product RD Modern Machine Tool and Its Requirements Integrated development of modern machine tools with virtual prototypes Keys of Virtual Machine Tool Integrated development of modern machinetools with virtual prototypes Keys of Virtual Machine Tool Kinematics studies with rigid multi-body simulation (concept design) Finite-Element-Analysis and structural optimization Coupled flexible Multi-Body-Simulation Calibration of the Simulation Models Optimization of the Simulation Models Kinematics Studies Method Tool Rigid multi-body simulation Optimization Steps Tasks Determination of the appropriate kinematic topology Determination of the right geometric dimensions ——A poor topology which is optimally designed may perform better than a mechanism with appropriate topology but poor design Kinematics Studies (cont-) Optimization of the kinematic performance Kinematics Studies (cont-) Rigid multi-body simulation Assembly analysis Kinematic analysis u, v, a Dynamic analysis - F ?ma, v, u Inverse dynamic analysis - u, v, a ?F Static analysis ——analyze the kinematic behavior, determine load histories, helps to choose proper elements or detect weak spots of a machine tool in the early design stages. Kinematics Studies (cont-) Finite-Element-Analysis and Structural Optimization Finite-Element-Analysis and Structural Optimization (cont-) Static analysis Being used to determine the displacements, stresses, strains, and forces in structures or components caused by loads that do not induce significant inertia and damping effects. Steady load and response conditions are assumed in static analysis; i.e., the loads and the structure’s response are assumed to vary slowly with time. Finite-Element-Analysis and Structural Optimization (cont-) Dynamic analysis Allows the examination of a structure with respect to time-varying effects. For machine tools the most important aspect is the analysis of no