Transverse vibrations of an underground cylindrical structure

Analysis of Structural Vibrations due to Passage of Underground Trains

During the last decades, the railway traffic in densely populated areas has increased. At the same time, passenger trains have become faster and freight trains have become heavier. Consequently, trains are an increasing source of ground vibration, which may be a nuisance to people, buildings and sensitive equipment. In this research, a two-dimensional dynamic system, including underground train...

Free Vibrations of a Stiffened Cylindrical Shell

~This report presents the first stage of an investigation of the response to random noise of a stiffened cylinder, representing an aircraft fuselage, including an analysis of the lower modes of such a cylinder. Preliminary investigations suggested that assumptions and approximations which are valid for the uniform, i.e., unstiffened, shell are not necessarily valid for a shell with heavy stiffe...

Friction Induced Transverse Vibrations of an Axially Accelerating String

The purpose of this study is to investigate the dynamic response of axially translating continua undergoing both the effect of friction and axial acceleration. The axially moving continuum is initially modeled as a string, neglecting its flexural stiffness; the response, with particular interest given to transverse vibrations and dynamic stability, is studied through numerical methods. A finite...

An Optimal Control of Transverse Vibrations of an Euler-Bernoulli Beam-String Complex System

In this paper, an optimal control of transverse vibrations of an Euler-Bernoulli beam and string complex system is studied. The dynamic response of the system is measured by a performance index that consists of a modified energy functional of two coupled structures at the terminal time and the expenditure of the control forces as a penalty term. The minimization of the performance index over th...

Mitigation of impact vibrations using impedance mismatch in cylindrical structures