Yukun Chen

Bio: Yukun Chen is an academic researcher from Harbin Engineering University. The author has contributed to research in topics: Deflection (engineering) & Elasticity (physics). The author has co-authored 1 publications. Previous affiliations of Yukun Chen include National University of Singapore.

A numerical solution for thermal free vibration analysis of rotating pre-twisted FG-GRC cylindrical shell panel

Abstract: Abstract A numerical solution based on finite element method is presented for free vibration analysis of rotating pre-twisted graphene reinforced composite (GRC) cylindrical shell. The piece-wise GRC layers are considered to stack according to functionally graded (FG) scheme across its thickness. The temperature-dependent material properties of the FG-GRCs are estimated using the extended Halpin–Tsai model. The motion equation is formulated through Lagrange's equation of motion considering moderate rotational speeds wherein Coriolis effect is ignored. The effects of type of shell, graphene distribution pattern, pre-twist angle, temperature, rotational speed, and hub radius to blade length ratio on the vibration characteristics are scrutinized.

Similarity design method for dynamic characteristics of rotating composite blades in thermal environment

Abstract: A similarity method for rotating composite blades in thermal environment is developed for the problems of difficulty, time consumption, high cost, and risk in the dynamic test under a high-temperature environment. Within this study, a set of scaling laws are derived for thin-walled composite plates based on their dynamic models and the applicability of the scaling laws is demonstrated in the similitude design of composite blades. The present dynamic model takes into account thermal stress and centrifugal stiffening effect. Analytical calculations show that the scaled models at relatively low temperatures can well reproduce the dynamic characteristics of their corresponding prototypes at high temperatures when taking into account the scaling of temperature change and rotational speed. • Thermal stress and centrifugal stiffening effect are considered in the dynamic model. • The scaling laws for temperature change, rotational speed, natural frequency, and acceleration response are deduced. • Models at low temperatures are used to predict prototypes in high-temperature operating environments. • The scaling laws for thin-walled composite plates are applicable to the prediction of composite blades.