Abstract
The principle of the harmonic analysis method and the its application in the hub runout measurement are introduced in detail in this article, and through the practical measurement data, the geometric meaning of judge the hub quality by the harmonic analysis method is proposed, and the disadvantages of the 8-point coordinate method are analyzed, and the computation method of the Fourier factor is improved, and the reliability to judge the hub quality by the harmonic analysis method is enhanced.
Highlights
As the key component concerning the safety and comfortableness of vehicle running in high speed, the hub requires higher and higher quality, and the detection is more and more difficult
The intelligent hub runout measurement system studied in this article adopts the real-time data acquisition and processing technology, the measuring head movement and measurement rotation of axes closed –loop control technology, and the hub automatic installment dismantlement technology, to realize the automatic detection of hub and the automatic analysis real time, and guarantee the detection precision
Supposed that the hub rotates one cycle, the data point quantity acquired by the sensor is 360, and in virtue of the 8-point coordinate method, only 8 points in Table 1 in the harmonic operation participate in the computation of Fourier factor, and other data are invalid
Summary
As the key component concerning the safety and comfortableness of vehicle running in high speed, the hub requires higher and higher quality, and the detection is more and more difficult. The amount of the known points are the integer multiples of 4, i.e. one period 2π is divided into 8, 12, 20, 24, 36, and 48 parts, i.e. 8, 12, 20, 24, 36, and 48 pair of data should be computed, which are respectively called by 8-point coordinates method, 12-point coordinates method, 20-point coordinates method, 24-point coordinates method, 36-point coordinates method, and 48-point coordinates method These methods can respectively solve 1~4’th harmonic, 1~6’th harmonic, 1~10’th harmonic, 1~12’th harmonic, 1~18’th harmonic and 1~24’th harmonic. Supposed that the hub rotates one cycle, the data point quantity acquired by the sensor is 360, and in virtue of the 8-point coordinate method, only 8 points in Table 1 in the harmonic operation participate in the computation of Fourier factor, and other data are invalid. N is the sampling point quantity of the sensor when the hub rotates one cycle, and n changes from 1 to N
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