Cylindrical shells are frequently encountered in industry, flight structures, pipeline systems and marine crafts. In these applications cylindrical shells are commonly subjected to harmonic excitations induced by pumps, turbines, compressors etc. Structures exposed to such loads can have structural failure due to sustained effect originated from the vibration by the dynamic load, and structural resonances. For suppression of noise and vibration in the system many design techniques have been employed, and the concept of laminated or multi layer shell has been utilized in several work. In such configuration layers with or without additional damping material stacked on top of each other to achieve the optimum vibration behavior. In rolled multi layer cylindrical shells this phenomenon is realized by rolling a thin plate around a cylindrical shell. Analyzing the coupled system in frequency domain, it is observed that the contact relation between adjacent layers change the system eigenvalues and eigenvectors, as well as resulting in overall reduction in noise and vibration compared to simple shell. In this research experimental modal analysis has been done, and case studies have been presented for different thickness configurations of rolled multi layer shell structure.

Experimental Modal Analysis of Rolled Multi Layer Cylindrical Shell

This paper presents a spectral finite element method for a cylindriacl shell with a passive constrained layer damping treatment. A thin shell theory based on Donnell-Mushtari-Vlasov assumption is employed. The equation of spectral unit and the method of determination of natural frequency and modal loss factor are presented.

Spectral Finite Element Modeling of Cylindrical Shells with Passive Constrained Layer Damping

This paper presents a transfer function method for a cylindrical shell with a partially passive constrained layer damping (PCLD) treatment. A thin shell theory based on Donnell-Mushtari-Vlasov assumption is employed to yield a mathematical model. The equation of motion and boundary conditions of a cylindrical shell with partially PCLD are derived. The paper provides theory supports for PCLD structure’s engineering applications in submarine weapon field.

Kinetic Analysis of a Cylindrical Shell Partially Treated with Constrained Layer Damping

This paper presents a experimental optimization method for a thin cylindrical shell with a partially passive constrained layer damping (PCLD) treatment. Vibration level difference theory is employed to evaluate damping effect of PCLD structures which the thicknesses of damping layer and constrained layer are different.

Xiang Zhang

Papers

Kinetic Analysis of a Cylindrical Shell Partially Treated with Constrained Layer Damping

An Experimental and Analytical Vibration Study of a Thin Cylindrical Shell Treated with Constrained Layer Damping

Spectral Finite Element Modeling of Cylindrical Shells with Passive Constrained Layer Damping