State space modeling of variation propagation in multistage machining systems with generalized fixture layouts: A case study from an engine manufacturing enterprise

In multistage machining systems (MMSs), dimensional variation propagates across stages due to fixture and datum deviations, compounded by process-induced deformation. Accurate modeling of this propagation remains challenging, as each stage may adopt distinct fixture layouts with different kinematic constraints. The lack of a unified mathematical representation further complicates variation propagation analysis under diverse fixture layouts. This paper presents a generalized Stream-of-Variation (SoV) model formulated within a unified state-space framework to overcome these limitations. The model accommodates generalized six-point fixture layouts by employing a locator matrix representation. Unlike conventional…

• NN
  National Natural Science Foundation of China

  Awards: 52275499, 92467101