Abstract: The reliability-based robust design for kinematic accuracy of the shaper mechanism under incomplete probability information is extensively discussed by combining the reliability-based optimization design theory, the reliability sensitivity technique and the robust design method. The loop closure equations are used to estimate the kinematic accuracy errors of planar mechanism, and the limit state function for kinematic accuracy failure of the shaper mechanism is developed. The mode of reliability-based robust design of the shaper mechanism is proposed, and under the condition that the first four moments of basic random parameters are available, the computer program based on this model can complete the reliability-based robust design for kinematic accuracy of the shaper mechanism and acquire the design information accurately and quickly.

Key words: Incomplete probability information, Reliability optimization, Robust design, Shaper mechanism