A vibration detection device and method for a flexible cantilever plate based on binocular vision

Abstract

The invention discloses a flexible cantilever slab vibration detection device and method based on binocular vision. The detection device comprises a left CCD camera and a right CCD camera. One end of a flexible cantilever slab is the fixed end, and one end of the flexible cantilever slab is the free end. A first resistance strain gauge sensor and a second resistance strain gauge sensor are pasted on the flexible cantilever slab. Matts are drawn in the front of the flexible cantilever slab. The first resistance strain gauge sensor and the second resistance strain gauge sensor detect bending vibration and torsion information of the flexible cantilever slab. After being amplified through a charge amplifier, analog signals are converted into digital signals through an A / D conversion card, then the digital signals are input into a computer, the left CCD camera and the right CCD camera provided with lenses detect the vibration information of the matts in the front of the flexible cantilever slab and transmit the vibration information to the computer, double CCD camera sensors are utilized for solving three-dimensional coordinates of line intersection points of the matts on the cantilever slab according to the parallax principle, and therefore the vibration information of the points can be obtained. Accordingly, the bending and torsion vibration information of the cantilever slab can be obtained.

Description

technical field [0001] The invention relates to the field of detection of large cantilever structures, in particular to a vibration detection device and method for a flexible cantilever plate based on binocular vision. Background technique [0002] Flexibility and upsizing are an important development trend of various aerospace structures. Lightweight structures can increase the weight of payloads and improve the efficiency of vehicles; large structures can increase space functions and the flexibility of spacecraft design and manufacturing. However, due to the low rigidity and high flexibility of large flexible structures, when operating in space with no external resistance, they are very vulnerable to external excitations and produce long-lasting low-frequency and large-amplitude vibrations. The vibration of flexible cantilever plates includes low-frequency bending and torsion Mode-coupled vibrations. It is necessary to measure low-frequency vibration, analyze vibration ch...

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Problems solved by technology

However, the application of piezoelectric materials and shape memory alloys is limited due to factors such as their own strength, fatigue life, and temperature resistance; accelerometer sensors and angular rate gyroscope sensors are sensitive to noise, and there are problems such as hysteresis and temperature drift that affect them. Accuracy, and can only measure the displacement of a certain point on the object, in order to obtain all the information, several accelerometers or angular rate gyroscopes must be arranged on the cantilever beam; the measurement range of the photoelectric position sensor is small, the structure is complex, and the operation is difficult Large, cumbersome calculation process and high cost; the main problem of fiber grating sensor is the demodulation of sensing signal, because the fiber grating is relatively fragile, it is very easy to damage in the harsh working environment, so it needs to be packaged before it can be used, package Complex structure of process and protective measures

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