A signal processing method for roundness measurement without angular position information
A technology of roundness measurement and angular position, which is applied in the field of roundness measurement signal processing method and its system, can solve the problems of inability to realize high-precision measurement of rotation error, inability to fully represent the entire shaft, difficulty in closing the circumference, etc., and achieve major production practice Significance, conducive to promotion and application, and the effect of extensive promotion and application
Active Publication Date: 2020-12-29
NAT INST OF METROLOGY CHINA
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Problems solved by technology
[0003] However, for actual on-site measurement, limited by the environment and devices, such as probe drift, noise, and no angular position measurement means, etc., there will be problems with difficult circumference closure, and high-precision measurement of rotation errors cannot be achieved.
[0004] The traditional simple method uses the inductance meter to read the diameter and calculate the radial runout of the rotary shaft system, but strictly speaking, only the readings of the four positions of 90°, 180°, 270° and 360° cannot completely represent the entire Axis information does not conform to the definition of international standards ISO 12181-1 and ISO 12181-2
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[0039] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0040] Please refer to figure 1 , the present invention provides a kind of roundness measurement signal processing method without angular position information, comprising steps:
[0041] S10. Obtaining a circularity signal;
[0042] The above-mentioned roundness signal can be obtained by measurement of a measuring sensor (referred to as a measuring head, such as inductive type, capacitive type, etc.) and a turntable. In specific operation, the ball can be placed in the center of the turntable, and the eccentricity can be adjusted so that the eccentricity is within a certain range. In this embodiment, in order to ensure the feasibility of on-site operation, the range is controlled within 5 μm. Adjust the measurement sensor to the best measurement position, turn the turntable at a constant speed, open the serial port for reading and timing, the obtained data is the ro...
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The invention provides a roundness measurement signal processing method and system without angular position information. The method comprises the steps: acquiring a roundness signal; preprocessing theroundness signal; with the roundness signal after preprocessing, calculating a cycle Tr of a roundness measurement signal by Fourier transform. The system includes an acquisition module for acquiringa roundness signal, a preprocessing module being connected to the acquisition module and being used for preprocessing the roundness signal, and a calculation module being connected to the preprocessing module and being used for calculating the cycle Tr of the roundness measurement signal by Fourier transform based on the preprocessed roundness signal. Therefore, the error caused by the circumferential closure problem is reduced and thus the foundation for improving the accuracy of the field roundness measurement is laid. The roundness measurement signal processing method and system are suitable for wide application and promotion and have the great production practice significance.
Description
technical field [0001] The invention belongs to the field of precision measurement of geometric quantities, and in particular relates to a roundness measurement signal processing method and a system thereof without angular position information. Background technique [0002] Roundness measurement technology is an important part of modern geometric quantity measurement technology, and the rotation contour of the precision spindle of the roundness meter is usually used as the evaluation benchmark. The application of roundness measurement technology in the laboratory is relatively mature. When the start and end signals of the uniformly rotating circle are known or the angular position signal of the roundness meter can be obtained, it is easy to obtain accurate signal periods. [0003] However, for actual on-site measurement, due to environmental and device limitations, such as probe drift, noise, and no angular position measurement means, there will be problems with the circumfe...
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IPC IPC(8): G01B21/20
Inventor 康岩辉徐晓璇王冰鹤
Owner NAT INST OF METROLOGY CHINA