A tolerance analysis method for rotating machinery

Rotating machinery is widely used in many fields of engineering. In rotating machinery design, the rotary precision is usually the first issue to determinate. Rotary precision is affected by many factors, such as tolerance design, assembly process and part deformation. In this paper, based on small displacement torsor (SDT) model, the tolerance representation and tolerance analysis was discussed firstly. Then the three dimensional non-repetitive run-out (3D-NRRO) of bearings and the assembly matrix to represent the assembly direction of bearing was introduced to the tolerance analysis. At last, the analysis method taking into account of part deformation is discussed.