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Rotor Systems, Analysis and Identification by Rajiv Tiwari
Book Details :
LanguageEnglish
Pages1091
FormatPDF
Size16.6 MB


Rotor Systems, Analysis and Identification by Rajiv Tiwari



PREFACE to Rotor Systems, Analysis and Identification by Rajiv Tiwari:

This Rotor Systems, Analysis and Identification by Rajiv Tiwari book is the outcome of an elective course on “Rotor Dynamics” offered by me to undergraduate, graduate, and postgraduate students at IIT Guwahati over the last 18 years. It contains material on some of the research work done by me with my graduate students.

Hopefully, the content will be useful for classroom teaching and will serve as a reference Rotor Systems, Analysis and Identification by Rajiv Tiwari book for pursuing research and development in the field of rotor dynamics.

In a broader sense, rotor dynamics covers several topics, namely modeling, analysis, measurement, signal processing, identification, condition monitoring, and control of rotor-bearing systems.

The modeling and analysis of rotor-bearing dynamics have now reached a mature state. The finite element method (FEM) and the transfer matrix method (TMM) have been used extensively for modeling and analyses of rotor systems.

Until today, monitoring the condition of rotor-bearing systems based on vibrations was mainly concerned with feature-based fault detection and diagnostics.

As a result of this, the methods available so far are not reliable and failsafe according to the expectations of fellow engineers working in the field. For model-based condition monitoring of rotor-bearing systems, identification methods for system parameters are under development.

In terms of identifying rotor system parameters, from the available literature a lot of possibilities have appeared in the field.

The purpose of this course material is to give a basic understanding of the rotor dynamics phenomena with the help of a few simple rotor models and modern analysis methods for real-life rotor systems.

This background will be helpful in the identification of rotor-bearing system parameters and its use in futuristic model-based condition monitoring and fault diagnosis and prognostics.

The content of the present Rotor Systems, Analysis and Identification by Rajiv Tiwari book is in two major parts as title of the Rotor Systems, Analysis and Identification by Rajiv Tiwari book also suggests, the first is the modeling and analysis of rotor phenomena, and the second is the condition monitoring of rotor systems and associated identification of system parameters.

The first part basically deals with theory related to dynamic analysis of simple rotors, which will give a systematic presentation of some of the rotor dynamic phenomena in the transverse and torsional vibrations with the help of simple rotor mathematical models.

But for analyzing complex rotors that are used in practice, the free and forced response analyses of multi-DOF rotor system have been presented.

The Euler-Bernoulli and Timoshenko beam models have been considered in transverse vibration analysis.

The present Rotor Systems, Analysis and Identification by Rajiv Tiwari book material keeps a balance between the transfer matrix method (TMM) and the finite element method (FEM) for the analysis of complex rotors.

However, the FEM is the most practical approach and it can be applied to very large complex rotor-bearing-foundation systems with its easy implementation in computer code and due to development in the condensation or reduction schemes to reduce computation effort and time.

The dynamic analysis of rotors contains finding the whirl natural frequency, mode shapes, Campbell diagram, critical speeds, unbalance responses and instability frequency bands.

Apart from conventional bearings, i.e. the rolling element and hydrodynamic bearings, and dynamic seals and dampers, the present Rotor Systems, Analysis and Identification by Rajiv Tiwari book also touch upon the contemporary active magnetic bearings and associated rotor unbalance response and instability analyses for the rigid and flexible rotors.

The second part basically contains the practical aspect of rotor systems related to the condition monitoring and system identification.


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