Abstract
In this research, the characterization test on nonlinear vibration of a fibre-reinforced composite thin plate is studied. First, in order to improve the efficiency and precision of the test, a laser scanning vibration system is designed and developed. Then, test methods and procedures of the harmonic distortion and nonlinear time-varying damping of such thin plates are proposed from the time-domain perspective. Corresponding test methods and procedures of nonlinear vibration properties such as the hard/soft stiffness and amplitude-dependent damping are also presented from the frequency-domain perspective. Finally, the TC500 carbon fibre/resin composite plate is selected as an example for the research to carry out a case study. Potential nonlinear vibration phenomena of such plates are characterized by the proposed test methods. It has been proved that the related test system and techniques adopted in this paper can provide an important reference for the establishment of the nonlinear vibration test methodology of fibre-reinforced composite structures.
Highlights
The fibre-reinforced composite is a kind of material with high strength, high specific modulus, good thermal stability and high damping capacity, allowing its wide use in aeronautics, astronautics, automobiles and other engineering fields.[1]
Vibration test system of the composite thin plate based on the laser scanning technique Due to the thin thickness and lightweight of the fibrereinforced composite thin plate, the additional mass of the traditional acceleration sensor has a greater impact on the test accuracy of the natural frequencies and damping
In order to obtain the nonlinear vibration parameters of the composite thin plate with high efficiency and accuracy, the researchers developed a vibration test system of the composite thin plate based on the laser scanning technique for the first time
Summary
The fibre-reinforced composite is a kind of material with high strength, high specific modulus, good thermal stability and high damping capacity, allowing its wide use in aeronautics, astronautics, automobiles and other engineering fields.[1]. Vibration test system of the composite thin plate based on the laser scanning technique Due to the thin thickness and lightweight of the fibrereinforced composite thin plate, the additional mass of the traditional acceleration sensor has a greater impact on the test accuracy of the natural frequencies and damping. In order to obtain the nonlinear vibration parameters of the composite thin plate with high efficiency and accuracy, the researchers developed a vibration test system of the composite thin plate based on the laser scanning technique for the first time. The laser scanning system is composed of Polytec PDV100 laser Doppler vibrometer, 45° mirror, 86HS45 stepping motor, motor driver, R-10 movement controller, X–Y sliding table and so on In this system, it is the laser vibrometer’s task to gauge the vibration frequency and amplitude of the composite plate with accuracy in Measurement and Control 53(7-8). In order to measure various nonlinear vibration phenomena of the composite thin plate with high efficiency and accuracy, the nonlinearity characterization test methods and procedures are summarized, which mainly contain the following nine key steps
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