Method for measuring shaft torque, rotary speed and power parameters of power device based on double cameras

Abstract

The invention relates to a method for measuring the shaft torque, rotary speed and power parameters of a power device based on double cameras. The method comprises the following steps: synchronously acquiring two sets of image sequences S11-S1n and S21-S2n on the premise of no load; adding the load and synchronously acquiring two sets of image sequences A11-A1m and A21-A2m; obtaining any one pair of images A1i and A2i with a synchronous corresponding relationship in A11-A1m and A21-A2m; performing correlation operation on A1i and S11-S1n to obtain a reference image S1i with the highest correlation; performing correlation operation on A2i and S21-S2n to obtain a reference image S2j with the highest correlation; finding a reference image S2t synchronously corresponding to S1i in S21-S2n in time, wherein the distance between S2t and S2j is the torsional displacement delta s of the two ends of a shaft, and the torque is obtained through a formula as shown in the description. According to the method, the precision is relatively high and the structure is simple.

Description

Technical field: [0001] The invention relates to a method for measuring physical parameters of a shaft in a power unit, and further relates to a method for measuring shaft torque, rotational speed and power parameters of a power unit. Background technique: [0002] In power machinery, shaft torque is one of the most typical mechanical quantities that reflect the dynamic performance of mechanical equipment. However, due to the hard texture of the shaft, the strain displacement of the shaft under the action of torque is very small, and the measurement of the torque of the shaft has always been a difficult research point. At present, torque measurement is mainly divided into two directions. One is to measure the torsion angle displacement at both ends of the shaft. This method can measure the speed signal at the same time, but because this method requires a large torsion angle at both ends of the shaft, it is generally suitable for long shafts. Torque measurement. For the tor...

AI Technical Summary

Problems solved by technology

For the torque measurement of the short shaft, the existing method is mainly to measure the stress and strain on the shaft, such as sticking the resistance strain gauge on the shaft surface, using magnetostrictive materials, and detecting the corresponding physical quantity of the material by applying these strain-sensitive materials on the shaft surface Changes to reflect torque, but this type of method also requires an additional speed sensor

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