Vibration-based estimation of beam boundary parameters

Vibration-based estimation of boundary stiffness and axial tension in beams using added mass

The study of Aerial-photography by Unmanned Aerial Vehicle(UAV), becomes more and more important especially for disaster countermeasures. The Vibration from rotor part has an influence on sensors which measures flight parameters. It was found that resonant with natural frequency of arm part and vibration of rotor part gave rise to problems to the flight-stability of UAV. The sensor values from resonance will increase the amount of aircraft control. It is considered to cause overturn and hunting motion of the aircraft. Based on the thrust generated from the propeller, was determined natural frequency of the rotor-arm part by Rayleigh method. Design to understand the natural frequency of aircraft parts, it is important to avoid the resonance. Therefore, the risk of resonance verified with the frequency of rotor rotation speed of propeller.

/pdf/resonance-analysis-of-the-uav-rotor-arm-part-2q848pc8cy.pdf

Resonance Analysis of the UAV Rotor-arm part

In this paper we propose a method by which the calculation of the natural frequencies of bending vibration of a straight rod with an additional mass and subjected to axial compression, and the estimation of the axial force based on the natural frequency is simplified. This method is an extension of Rayleigh's method. The effect of the additional mass on the mode shapes is first studied using a rigorous analysis. The deflections of the rod assumed in the calculation are modified principal mode shapes of bending vibration of a rod with neither additional mass nor axial force. Comparisons between calculated results and experimental results show that if the additional mass is lighter than about half the mass of the rod, natural frequencies up to the third mode are obtained with good accuracy, and that estimation of the axial force can be made with errors of less than ten percent.

Calculation of Natural Frequencies of Bending Vibration of Straight Rod with Additional Mass and Subjected to Axial Compression, and Estimation of Axial Force

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Calculation of Natural Frequencies of Bending Vibration of Straight Rod with Additional Mass and Subjected to Axial Compression, and Estimation of Axial Force