Torsional Vibration Characteristics of a Rotating Composite Thin-Walled Beam with Varied Hygrothermal Parameters
Composite beams have a number of excellent properties such as high strength,light weight,strong corrosion resistance,strong temperature resistance and strong fatigue resistance,and are widely used in engineering such as wind turbine blades,helicopter propellers,etc.Based on the vibration equations of a rotating composite thin-walled beam in the hygrothermal environment,the torsional motion of the beam was studied.The solutions of the eigenvalue equations were derived using the Rayleigh-Ritz method.The influences of temperature,moisture,rotating speed,mounting angle,ply angle and other factors on the frequencies and mode shapes were analyzed.The accuracy of the calculation results was verified using the finite element method.The results show that the first two frequencies decrease with the increase of temperature and humidity.And compared to humidity,temperature has a more significant impact on frequencies.For the conditions of T=325～425 K and the ply angle of 15°～30°,the influence of temperature on the frequency is slightly smaller.For the ply angle around 0° or 90°,the humidity has little effect on the frequencies.In addition,the frequencies increase as the rotational speed increases or the mounting angle decreases.The ply angle has a significant influence on the frequencies.It is also found that temperature,moisture,rotational speed,ply angle and mounting angle have little effect on the modal shape of the first two modes.
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