A World Without Turbomachinery

In just about every corner of the globe, machines are used and needed for the modern world and its people to function in normal everyday life. But what if these machines were to just…disappear? How badly would it disrupt modern society? Our young protagonist is about to find himself in the midst of such a scenario as he comes to realize he’s taken residence in an apartment building located inside a little neighborhood known as…the twilight zone.  

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I open my eyes slowly and rejoin the world, in all of its silence. Hold on, it’s Thursday, the alarm was supposed to wake me up! I roll over to check the time, and the screen is just a blank, black façade. That’s odd. The alarm clock isn’t working. The fan isn’t on either. The power must be out. What could have happened to shut off the power? Read More

What is Rotor Dynamics? And Where is it Found?

Welcome to this next edition of our “Introduction to Rotor Dynamics” series! In this edition we’ll be covering the definitions of rotor dynamics, and how it is an important factor in the lifetime of a rotating machine. So, for starters, what is rotor dynamics?

Well, if you read our preface which can be found here, you probably knew the answer already; or if you’ve been working in this field, you probably also have a good answer. For those of you new to rotor dynamics, however, it’s a branch of applied mechanics in mechanical engineering and is concerned with the behavior of all rotating equipment; considering phenomena like vibration, resonances, stability, and balancing. It accounts for many effects: from bearings, seals, supports, loads and other components that can act on the rotating system.

Is rotor dynamics vibration analysis?

Yes partially, but there is much more that needs to be considered as you can guess from the above definition. Vibration analysis simply isn’t enough, because the rotors in these machines spin at such high RPMs and are so heavily loaded. Something as simple as the bearing’s position and stiffness, or a slight asymmetry from blade creep can affect a rotor’s behavior.

Where can rotor dynamics be found and analyzed?

The short answer is, there are numerous machines where rotor dynamics can be considered.  In fact, it’s probably easier to list the numerous applications where rotor dynamics doesn’t exist.

A 3D model of a gas turbine rotor train
Figure 1: A 3D Model of a Gas Turbine Rotor Train.

Below is a very short list of some examples where rotor dynamics can be considered: Read More

New Series on Rotordynamics: Preface

Welcome to our latest blog series on rotor dynamics! In this series we’ll be covering fundamentals and a general overview of the engineering discipline that is rotor dynamics, including some basic definitions, why it’s important, the different calculations, and the overall objectives and purposes for these calculations.

Axial Compressor Rotor

In the months ahead, you can expect to learn more about: Read More