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Author

Jia Sun

Bio: Jia Sun is an academic researcher from Royal Institute of Technology. The author has contributed to research in topics: Equations of motion & Boundary value problem. The author has an hindex of 4, co-authored 6 publications receiving 120 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a novel dynamic model for a pretwisted rotating compressor blade mounted at an arbitrary stagger angle using general shell theory and including the rotational velocity is developed to study the eigenfrequencies and damping properties of the pre-strained rotating blade.

67 citations

Journal ArticleDOI
TL;DR: In this paper, a dynamic model based on classical plate theory is presented to investigate the vibration behavior of a rotating blade at an arbitrary stagger angle and rotation speed, and the Hamilton's principle is applied to the model.

58 citations

Journal ArticleDOI
TL;DR: In this article, a model for a multilayer rotating blade mounted at an arbitrary stagger angle using a quadratic layerwise theory is developed to study structural dynamics of the blade, particularly damping properties, using various coating layer configurations.

20 citations

Proceedings ArticleDOI
10 Oct 2010
TL;DR: In this paper, the authors developed methods to improve the damping performance of compressor blades, where hard coating technique is applied to increase the structural damping, displaying both measurements and modeling r...
Abstract: Methods are developed to improve the damping performance of compressor blades, where hard coating technique isapplied to increase the structural damping, displaying both measurements and modeling r ...

11 citations

01 Jan 2011
TL;DR: In this paper, the Chebyshev collocation method is applied to discretize the two-dimensional equations of motion on a 2D mesh grid and a coupled 2 nd order ordinary differential equation is obtained for the numerical simulation.
Abstract: A dynamic model of a straight, rotating blade is used and the equations of motion as well as the boundary conditions are extracted from the corresponding variational formulas. The Chebyshev collocation method is applied to discretize the two-dimension equations of motion on a 2D mesh grid. With an appropriate implementation on the dynamic boundary conditions, a coupled 2 nd order ordinary differential equation is obtained for the numerical simulation. A validation study with the convergence analysis is performed showing an acceptable agreement and a parametric analysis is implemented giving a Campbell diagram. Furthermore, the results archived by this method can be applied to both forced response and transient analyses.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: This review is expected to provide a clear picture of layerwise theory for modeling of composite laminated structures and serve as a useful resource and guide to researchers who intend to extend their work into these research areas.

170 citations

Journal ArticleDOI
TL;DR: In this paper, the free vibrations of the rotating pretwisted functionally graded (FG) composite cylindrical panels reinforced with the graphene platelets (GPLs) were investigated by considering the cantilever boundary conditions.
Abstract: This paper investigates the free vibrations of the rotating pretwisted functionally graded (FG) composite cylindrical panels reinforced with the graphene platelets (GPLs) by considering the cantilever boundary conditions. The weight fraction of the graphene platelets in each ply may be different, which leads to the layer-wise functionally graded composite cylindrical panels reinforced with the GPLs. The effective Young's modulus is calculated by the modified Halpin-Tsai model. The effective Poisson's ratio and mass density are derived by the rule of the mixture. The strain-displacement relationship is acquired by the Green strain tensor. Based on the first-order shear deformation theory, Chebyshev-Ritz method is used to obtain the natural frequencies of the rotating pretwisted functionally graded composite cylindrical panel reinforced with the GPLs. The natural frequencies are discussed by considering different material and geometry parameters of the rotating pretwisted functionally graded composite cylindrical panel reinforced with the GPLs, such as the GPL distribution pattern, the GPL weight fraction, the geometries of the GPLs, the pretwisted angle, the presetting angle and the rotating speed. Several validations are carried out, the numerical results are in good agreement with the results of the literature and ANSYS.

126 citations

Journal ArticleDOI
TL;DR: In this paper, a new dynamic model of the rotating tapered cantilever cylindrical panel with the graphene coating layers is developed to investigate the vibration characteristics of a rotating pretwisted tapered blade.

83 citations

Journal ArticleDOI
TL;DR: In this article, a novel dynamic model for a pretwisted rotating compressor blade mounted at an arbitrary stagger angle using general shell theory and including the rotational velocity is developed to study the eigenfrequencies and damping properties of the pre-strained rotating blade.

67 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present an overall review for the layerwise theories of the laminated composite structures and their applications, and present two basic schemes employed to establish a LWT according to the construction of the displacements fields in the thickness direction.
Abstract: It is very challenging to accurately analyze the displacement and stress fields in the laminated composite structures due to the transverse anisotropy and higher transverse flexibilities. The equivalent single-layer theory (EST) is first developed to simplify this complex 3D problem to a pure 2D problem based on a displacement assumption in the thickness direction. The EST gives good results for the global responses of the very thin laminates with minimum computation cost, but poor results for the local responses at the interfaces and can not presents the zig-zag distribution of in-plane displacements. The elasticity solutions based on the 3D displacement-based finite element method (FEM) can present the accurate displacement and stress fields, but requires huge computational cost. As a quasi 3D method, the layerwise theories (LWT) is more accurate than most of the ESTs, and its computational cost is less than that of the 3D-based displacement FEMs, so it is attracting more and more attention with the rapid development of computer technology. This paper presents an overall review for the LWTs of the laminated composite structures and their applications. In general, there are two basic schemes employed to establish a LWT according to the construction of the displacements fields in the thickness direction. In the first scheme, the laminated composite structures are described as an assembly of individual layers, and these individual layers are combined by the interlaminar relationships to keep the displacement continuity and stress equilibrium. All of the individual layers are simulated by using the EST. In the second scheme, the displacement and/or stress fields along the thickness direction are constructed by a 1D interpolation functions and the in-plane displacement and/or stress fields are discretized by the 2D finite elements. The review in this paper is organized by the this classification.

63 citations