关键词: 大尺寸直线度, 测量间距, 谐波分析, 计算机仿真

Abstract: For the selection difficulty on measuring interval that match accuracy with efficiency in large-scale straightness measurement,based on large-scale straightness measurement approach of Nyquist sampling theory,the surface profile signal of measured object was extracted,and the parameters which affected the determination of measuring interval were discussed by harmonic analysis technology.To solve the problem that surface profile signal needed to be sampled in advance when used the theoretical approach,a measurement simulation method based on error distribution rule was presented.A series of experiments were conducted to confirm the validity of proposed two methods and 500mm was suggested to the introduced measuring interval for large-scale straightness measurement,which had great meaning for choosing the straightness measuring interval of large-scale.

Key words: large-scale straightness, measuring interval, harmonic analysis, computer simulation