Non-contact vibration measuring system and method

Abstract

Provided is a non-contact vibration measuring system used for measuring vibration on the surface of a film. The system comprises two cameras, a tripod, a light source and a computer, the cameras and the light source are arranged on the tripod, the light source is used for irradiating a measured area on the surface of the film, the cameras shoot images of the measured area and send the images to the computer, and the computer processes the images to obtain the vibration condition on the surface of the film. Compared with the prior art, according to the system, long-distance non-contact stereoscopic measurement of the vibration amount and the strain amount on the surface of a flexible bag body can be performed, the man-made stress interference of contact measurement with the flexible bag body is eliminated, the measuring precision is substantially improved, conventional measuring points are expanded to a measuring region, and vibration and strain conditions of any point in the measuringregion can be analyzed; besides, the calibration function is provided, measuring errors due to installation of a binocular optical system are eliminated, rapid online acquisition and high-efficiency offline processing are realized, and the all-weather test capability is achieved.

Description

technical field [0001] The invention relates to the field of vibration measurement, in particular to a non-contact vibration measurement system and method, especially suitable for vibration measurement of light film surfaces such as airship capsules. Background technique [0002] In the field of high-altitude airships with power, it is often necessary to analyze the disturbance of the natural environment and the impact of the vibration of the propulsion device on the vibration of the entire airship capsule. For example, in the process of normal flight analysis, it is necessary to avoid local resonance between the propulsion system and the capsule interface caused by the vibration of the propulsion system, which will cause damage to the capsule, air leakage, and decrease in capsule strength. Therefore, it is necessary to detect important areas under various working conditions There are two traditional measurement methods for the vibration of the capsule surface. [0003] One...

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Problems solved by technology

[0003] One is contact measurement, contact measurement methods such as installing acceleration sensors, etc., not only the installation and analysis process is complicated, but also the installed sensors will change the vibration law of the membrane surface, making it impossible to measure accurately and affecting the measurement results

In addition, this measurement method can only measure the vibration near the point where the sensor is located, but cannot know the vibration of multiple points in the area of ​​interest, and cannot measure the strain on the surface of the capsule during vibration analysis

[0004] The second is the non-contact Doppler laser measurement. Although the Doppler laser measurement avoids direct contact with the surface of the capsule, which will affect the vibration of the surface of the capsule, it is only suitable for single point, or the measured area is small, for large-area, three-dimensional, multi-point objects to be measured, the above two methods are not applicable

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