Device for measuring bending and torsional vibration of hinged plate of phase-sensitive detector (PSD) sensor and method for device

Abstract

The invention discloses a device for measuring bending and torsional vibration of a hinged plate of a phase-sensitive detector (PSD) sensor and a method for the device. The device comprises a hinged plate body part and a detection part. The hinged plate consists of three flexible plates connected together through hinges; a substrate for fixing the hinged flexible plates is provided with a laser emitter, and a two-dimensional PSD is arranged on the edge at the tail of the hinged plate. When the hinged plates is vibrated, the two-dimensional PSD moves along the vibration of the hinged plate, the positions of light spots generated on the two-dimensional PSD by the laser emitter are also changed, the two-dimensional PSD transmits the detected change information to a computer, and the computer performs decoupling operating to obtain small-amplitude bending and torsional vibration measured parameters of the hinged plate for vibration analysis or control. The invention realizes decoupling of the bending and torsional vibration of the hinged plate structure in detection.

Description

technical field [0001] The present invention relates to large-scale flexible structure vibration detection, in particular to a hinged plate bending and torsional vibration measurement device and method for PSD sensors, specifically to provide a solar panel structure for simulating flexible hinged multiple panels, using laser PSD transmission An apparatus and method for sensing system to realize bending and torsional mode vibration detection. Background technique [0002] The solar panel structure of the spacecraft must be folded and loaded before the spacecraft is launched, and then unfolded after entering orbit. Some solar panels are hinged and expandable multi-body connection structures. These solar panel structures have the following characteristics: first, they are light in weight and large in span; The body connects the movement system. These characteristics lead to complex dynamic characteristics such as low frequency, weak damping, and dense low-frequency modes. Th...

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Problems solved by technology

However, the piezoelectric ceramic material is a brittle material, and its application is limited due to the influence of its strength, fatigue life and space environment temperature; the measurement noise of the acceleration sensor is relatively large, which requires filtering of the vibration signal, and the acceleration The sensor signal and the vibration signal detected by the angular velocity gyro are also coupled with the acceleration and angular rate signals of the spacecraft body. In practical applications, the signal of the spacecraft body needs to be decoupled.

Moreover, the bandwidth limitation of the acceleration sensor will introduce large errors for the detection of low-frequency and small-amplitude vibrations, which will affect the measurement accuracy

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