Weighing device and method based on modal frequency of cantilever beam

Abstract

The invention relates to a weighing device and weighing method based on modal frequency of a cantilever beam. The device comprises a tungsten halogen lamp light source module, a Michelson interferometer module, a two-dimensional spectrograph module, a cantilever beam module and a computer. The invention provides a structure modal analysis method that is high in efficiency and accuracy, non-contact, lossless and high in resolution ratio and does not introduce additional weight on the basis of learning and research on vibration detection and modal analysis of a light thin-wall structure piece; by using the method, real-time modal analysis can be performed on the beam structure without knowing the information of a shock excitation input signal, and weighing can be implemented without knowingthe shock excitation input signal.

Description

technical field [0001] The invention relates to the field of optical measurement mass weighing, in particular to a mass weighing device and method based on the modal frequency of a cantilever beam. Background technique [0002] Two-dimensional frequency-domain optical vibration tomography (2D-OCVT) is based on the principle of low-coherent light interference, and uses a high-speed CMOS camera as a detector to obtain the displacement of the vibrating structure by analyzing the interference signal between the reflected light on the surface of the vibrating structure and the system reference light. Information, after spectrum correction, the vibration displacement accuracy of nanometer ultra-high resolution can be obtained. The 2D-OCVT system can realize the line domain vibration test, and the displacement information of multiple points on the line can be obtained at the same time in one acquisition, and the real-time modal analysis of the beam structure can be performed withou...

AI Technical Summary

Problems solved by technology

In the vibration detection and modal analysis of light thin-walled structural parts, the impact of the additional mass introduced by traditional contact sensors such as displacement and acceleration on the test piece cannot be ignored, which will cause a large error in detection, and for some surfaces Where processing quality is high and non-contact vibration testing is required, traditional vibration sensors cannot meet the detection requirements.

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