Journal ArticleDOI
Determination of Contact Stiffness of Rod-Fastened Rotors Based on Modal Test and Finite Element Analysis
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In this paper, a series of simplified rod-fastened rotors, which have different surface contact roughness are manufactured and their modal parameters under different pretightening force, are measured in free-free state.Abstract:
A series of simplified rod-fastened rotors, which have different surface contact roughness are manufactured and their modal parameters under different pretightening force, are measured in free-free state. The concept of surface contact stiffness is introduced to simulate the influence of pretightening force on modal parameters of these simplified rod-fastened rotors using finite element method. The experiment measured results are compared and fitted to the finite element analysis results and the relationship between contact stiffness and contact stress is established in which the contact stress is defined by the pretightening force. The relationship is then applied on the modal analysis of a real gas turbine rotor, and its modal test results and finite element analysis results are consistent with each other, proving that the relationship and the described determination method of contact stiffness based on modal test and finite element analysis are effective.read more
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Journal ArticleDOI
Interfacial contact stiffness of fractal rough surfaces
TL;DR: A theoretical model that predicts the interfacial contact stiffness of fractal rough surfaces by considering the effects of elastic and plastic deformations of the fractal asperities is described and excellent agreement is observed between the contact stiffness predicted by the theoretical model and by the analogous experimental results.
Journal ArticleDOI
Dynamic investigation of aeroengine high pressure rotor system considering assembly characteristics of bolted joints
TL;DR: The mechanical model of the bolted joint is presented by characterizing the mechanical relationship between the adjacent nodes of the joint interface and finite element method, which provides a theoretical basis for detecting and identifying the performance of the bolt joint of the aeroengine rotor system.
Journal ArticleDOI
Effects of Bending Moments and Pretightening Forces on the Flexural Stiffness of Contact Interfaces in Rod-Fastened Rotors
TL;DR: In this article, the authors used the Hertz contact theory and the GW (Greenwood and Williamson) statistical model to calculate the equivalent flexural stiffness of a rod-fastened rotor.
Journal ArticleDOI
An Investigation on Dynamic Characteristics of a Gas Turbine Rotor Using an Improved Transfer Matrix Method
Cheng Meng,Ming Su,Shaobo Wang +2 more
TL;DR: In this paper, an improved Riccati Transfer Matrix (TMM) was proposed to evaluate the contact effects brought by a face tooth in a rod-fastened rotor, and a computer program was developed to obtain the dynamic characteristics such as critical speeds of lateral vibration, mode shapes, and an unbalance response.
Journal ArticleDOI
Nonlinear Dynamics of the Rod-Fastened Jeffcott Rotor
References
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Journal ArticleDOI
A Numerical Model for the Elastic Frictionless Contact of Real Rough Surfaces
M. N. Webster,R. S. Sayles +1 more
Proceedings ArticleDOI
Estimation of Contact Stiffness and its Role in the Design of a Friction Damper
TL;DR: In this paper, a detailed investigation of the contact stiffness computation of the damper and the platform was carried out to study the effect of various parameters such as friction coefficient, centrifugal load, material properties etc.
Journal Article
Model test and analysis of gas turbine rotor
TL;DR: In this article, the authors take a type of gas turbine rotor as an example to analyze its natural frequency and modal shape, and the transfer matrix method is also used to compute its model.