Fig 1.
Joint surface of an actual woodworking machine structure.
(a) Forced form of joint surface, (b) Joint surface structure finite element nodes and units schematic.
Fig 2.
Space unit composed of joint node.
Fig 3.
Bed finite element analysis process.
Fig 4.
Bed simplified 3D solid model.
Table 1.
Material properties of each part of bed.
Table 2.
Joint stiffness and damping characteristics.
Fig 5.
Bed structure finite element model and joint space unit.
(a) Bed finite element model, (b) Joint space unit.
Table 3.
Comparison of test frequency and simulation analysis frequency.
Fig 6.
Modal test site and test point layout.
(a) Modal test site, (b) Measuring point layout block diagram.
Fig 7.
Relative error between simulation result and test result.
Fig 8.
Comparison of modal modes between finite element modes and experimental modes.
(a) 1st analysis mode, (b) 1st test mode, (c) 2nd analysis mode, (d) 1nd test mode, (e) 3rd analysis mode, (f) 3rd test mode, (g) 4th analysis mode, (h) 4th test mode, (i) 5th analysis mode, (j)5th test mode, (k) 6th analysis mode, (l)6th test mode.
Fig 9.
Optimized bed 3D solid model model.
Table 4.
Optimized parameters and their value ranges.
Fig 10.
Flow chart of bed structure optimization.
Fig 11.
Sensitivity analysis chart of L1, L2, L3 and D to each performance.
Table 5.
Structural optimization for relatively optimal solutions.
Table 6.
Roundness results of optimization variables.
Table 7.
Comparison of natural frequency before and after bed optimization.