Abstract: The locating error analysis model of 3D workpieces involves a large number of parameters and is complicated. To find robust locating scheme by this model, most of the existing researches adopt numerical method; however, only a specific solution can be achieved rather than a general solution, thus regularities or rules cannot be revealed explicitly. In this study, by introducing two additional assumptions according to common engineering conditions, the deterministic locating analysis model is simplified; based on the simplified model, the robustness of locating scheme is analyzed analytically, and general solution of the most robust locator layout is given. The solution and what it reveals, are validated by a commercial variation analysis software VisVSA, and by using the locating of a plate workpiece as an example. The result has applied to the locating scheme design of the mounting of a stamp exhaust pipe on the rear fuselage.

Key words: deterministic locating, locating scheme, robust design