Effect of bearing number on non-linear dynamic behaviour of aerodynamic non-circular journal bearing systems

2009 ◽  
Vol 224 (2) ◽  
pp. 139-156 ◽  
Author(s):  
R Rashidi ◽  
Karami A Mohammadi ◽  
F Bakhtiari-Nejad
Keyword(s):  
Dynamic Behaviour ◽  
Journal Bearing ◽  
Linear Dynamic ◽  
Non Linear ◽  
Bearing Number

Analysis of an aerodynamic grooved journal bearing with plain sleeve

2006 ◽  
Vol 220 (1) ◽  
pp. 51-60 ◽  
Author(s):  
C-C Wang
Keyword(s):  
Reynolds Equation ◽  
Dynamic Behaviour ◽  
Journal Bearing ◽  
Power Spectra ◽  
Operating Conditions ◽  
Complex Dynamic ◽  
Non Linear ◽  
Linear Behaviour ◽  
Bearing Number ◽  
Rotor Mass

This article studies the non-linear behaviour of a herringbone-grooved rigid rotor supported by a gas film bearing. A numerical method is employed to a time-dependent mathematical model for herringbone-grooved gas journal bearings. The finite difference method with successive over-relation method is employed to solve the Reynolds equation. The system state trajectory, Poincaré maps, power spectra, and bifurcation diagrams are used to analyse the dynamic behaviour of the rotor centre in the horizontal and vertical directions under different operating conditions. The analysis reveals a complex dynamic behaviour comprising periodic and quasi-periodic responses of the rotor centre. This article shows how the dynamic behaviour of this type of system varies with changes in rotor mass and bearing number. The results of this study contribute to a further understanding of the non-linear dynamics of aerodynamic-grooved journal bearing systems.

The complex stiffnes method to detect and identify non-linear dynamic behaviour of SDOF systems

1989 ◽  
Vol 3 (1) ◽  
pp. 37-54 ◽  
Author(s):  
M. Mertens ◽  
H. Van der Auweraer ◽  
P. Vanherck ◽  
R. Snoeys
Keyword(s):  
Dynamic Behaviour ◽  
Linear Dynamic ◽  
Non Linear

scholarly journals Operational Modal Analysis and Non-Linear Dynamic Simulations of a Prototype Low-Rise Masonry Building

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 471
Author(s):  
Ilaria Capanna ◽  
Riccardo Cirella ◽  
Angelo Aloisio ◽  
Franco Di Di Fabio ◽  
Massimo Fragiacomo
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Behaviour ◽  
Model Updating ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Mechanical Parameters ◽  
Linear Dynamic ◽  
Global Dynamic ◽  
Non Linear

This paper focuses on the dynamic behaviour of a low-rise masonry building representing the Italian residential heritage through experimental and numerical analyses. The authors discuss an application of combined Operational Modal Analysis and Finite Element Model updating for indirect estimation of the structural parameters. Two ambient vibration tests were carried out to estimate the structure’s dynamic behaviour in operational conditions. The first experimental setup consisted of accelerometers gathered in a row along the first floor to characterize the local dynamic of the floor. Conversely, the second setup had the accelerometers placed at the building’s corners to characterize the global dynamics. The outcomes of the first setup were used to estimate the mechanical parameters of the floor, while the ones form the second were used to characterize the mechanical parameters of the masonry piers. Therefore, two finite element models were implemented: (i) a single beam with an equivalent section of the floor to grasp the local behaviour of the investigated horizontal structure; (ii) an equivalent frame model of the entire building to characterise the global dynamic behaviour. The model updating process was developed in two phases to seize local and global dynamic responses. The updated numerical model formed the basis for a sensitivity analysis using the modelling parameters. The authors chose to delve into the influence of the floor on the dynamic behaviour of low-rise masonry buildings. With this aim, non-linear dynamic analyses were carried out under different mechanical characteristics of floors, expressing the scatter for ordinary masonry buildings. The displacements’ trends along the height of the building evidenced the notable role of the floor’s stiffness in the non-linear dynamic behaviour of the building. Lastly, the authors derived the fragility curves predicting the seismic performance in failure probability under a highly severe damage state.

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