Characteristics Identification of Straightness Error on Error Separation Technique

摘要

The straightness error was measured from a certain part surface by CMM. The paper expounded the principle of error separation technique, and separated the straightness error into deterministic error and random error. It proved strictly an opinion that random error is obedient to normal distribution. Extraction point of random error far outweighs the extraction point which is obtained from deterministic error. Based on the principle of sampling signal, a conclusion can be pointed out that utilizing the characteristic of random error to recover the signal of straightness error without distortion is feasible and normal distribution model can be used in the computer simulation to study the problem of extraction point.