Single camera based power device shaft torque, rotation speed and power parameter measurement methods

Abstract

The invention relates to a power device shaft torque, rotation speed and power parameter measurement methods. The power device shaft torque measurement method comprises the following steps: acquiring a group of image sequences S1-Sn synchronously before loading; acquiring a group of image sequences A1-Am synchronously after loading; selecting any on frame of image Ai from the image sequences A1-Am, and carrying out correlation calculation on the image Ai and a reference image sets S1-Sn to obtain a reference image Si with the highest correlation; and selecting two subareas of two distant points P0 and Q0 from the same ordinate of the reference image Si, carrying out correlation calculation on the position P0' (x'0, y'0) and the position Q'0 (x'1, y'1) of the two points P0 and Q0 in the image Ai to obtain integer pixel displacement torsion angles as shown in the specification of two ends of the image Ai before and after the change of stress, and obtaining the torque through a formula as shown in the specification. The power device shaft torque, rotation speed and power parameter measurement methods have the advantages of high precision and simple structure.

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

Images