| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus that reduce measurement time and inspect a contact angle on an in-line (manufacturing line) even if the rotational speed of a turning wheel is low. SOLUTION: A contact angleαis obtained by obtaining one fundamental frequency of an inner ring frequency fi, a revolution frequency fc, an outer ring frequency fo, a rolling element frequency fb from harmonic components in a waviness frequency. The fundamental frequency is estimated by extracting an n-order harmonic component, and the measurement time is reduced to 1/nz in that case, thus contributing to a decrease in measurement time in a line. COPYRIGHT: (C)2004,JPO
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