BEARINGS
ROTOR DYNAMICS
TORSIONAL VIBRATION
Seminar

Typical 3-Day Seminar

TECHNOLOGY TRANSFER  SHORT COURSE ON FLUID-FILM / ROLLING-ELEMENT BEARINGS, MACHINERY ROTOR DYNAMICS & DRIVE-TRAINS TORSIONAL VIBRATION 

Detailed coverage of the fields of fluid-film / rolling element bearings, machinery rotor dynamics and mechanical drive trains torsional vibration illustrated by the presentation of case histories and the application of advanced software for the modeling, analyses, and troubleshooting real life bearing and vibration problems encountered in rotating equipment. No previous experience is required and participants will have guided sessions for model development, analyses, results interpretation and troubleshooting bearing and rotor/bearing systems.

About the Course

This course is designed for engineers and technical managers who are involved in rotating machinery design, operation, maintenance, diagnostics, and troubleshooting, with emphasis on bearings and bearings systems, machinery rotor dynamics, and drive train torsional vibration.

The first session of the course will focus on bearings, the vital tribological element of rotating machinery, beginning with their fundamental principles of operation through computer-implemented evaluations of their operational performance characteristics and limitations. Design considerations and applications of fluid-film bearings will be discussed along with the presentation of numerous real life case histories to illustrate the technology and its application to rotating machinery failure analysis and troubleshooting of common, as well as, unique vibration problems. Following the fluid-film bearings, an introduction to rolling element bearings will be presented illustrating their various applications and their effects on system rotor dynamic .

The second and third sessions focuses on rotating machinery dynamics (rotor dynamics & torsional vibration). The interacting influence of bearings on the dynamic behavior of machinery will be reviewed and illustrated by the construction of analytical models, and evaluated by computerized solutions. Participants are encouraged to present problems to be discussed.


Time will be provided after each session for additional questions and discussion. 

Day 1 - Fluid-Film Bearings

This session is presented in a simple way to understand the technology of sliding surface bearings so that participants with or without previous knowledge benefit from the presentation and can apply it immediately in their profession. The session is a full coverage of fluid-film BEARINGS (the vital tribological elements of rotating machinery that support, guide, and locate the rotating assembly) beginning with their fundamental principles of operation through computer-implemented evaluations of their operational performance characteristics and limitations. Design considerations and applications of sliding surface bearings with emphasis on HYDRODYNAMICALLY lubricated fluid-film bearings will be discussed along with presentations of practical examples and case histories. Topics include:

INTRODUCTION TO BEARINGS (Includes the presentation of a real life bearing failure problem and effective solution taking time and cost in to consideration)

  • Functional Roll
  • The Two Primary Classes
  • Noteworthy Differences Between The Two Classes Of Bearings

SLIDING SURFACE BEARINGS

  • Fundamentals
  • Distribution of Bearings Hardware/Demonstration
  • Types and Definition
  • Load Support Mechanisms
  • Modes of Lubrication
  • Frictional Response Characteristics 
  • Lubricant Temperature/Viscosity Dependent Properties and Heat Balance Effects
  • Terms and Concepts of Hydrodynamic Lubrication and Its Requirements
  • Terms and Concepts of Hydrostatic-Hybrid Lubrication and Its Requirements
  • Turbomachinery Hydrodynamic Bearing Types, Performance, and Dynamic Characteristics
  • Oil Whirl / Whip
  • Advantages / Disadvantages
  • Cost

FLUID-FILM BEARING TYPES AND APPLICATIONS

  • Fixed & Tilting Pad Geometries
  • Journal, Thrust & Conical

BEARINGS STATE-OF-THE-ART TECHNOLOGY

  • Advanced technology presentation & demonstration
  • Summary of course content and application of bearings technologies

Days 2 & 3
Rotor Dynamics & Torsional Vibration 

Rotor dynamics and torsional vibration technologies presented in a simple way to participants, with or without previous knowledge, to be applied immediately in their profession. Commonly used terminology in the industry such as lateral and torsional critical speeds, mode shapes (rigid body & bending), stability, bearing whirl/whip, phase angle, critical damping, gyroscopic effects, unbalance, API-amplification factors & required separation margins, etc., will be discussed and illustrated throughout the course by the presentation of practical examples and case histories. The course handout includes sufficient details to be used as a reference including a tutorial section on rotor dynamic fundamentals and terminology. Topics include:

INTRODUCTION & OVERVIEW (Includes the presentation of a real life vibration problem and cost/time effective corrective actions taken as a solution)

BASICS OF MACHINERY VIBRATION – Introduction

  • Vibration Theory – Single mass system, planar vibration.
  • Response & Shaft Dynamics – Displacement, velocity & acceleration amplitude & phase.
  • Forces in Rotating Equipment – Bearings, Cavitation, Imbalance, Hydraulic, Aerodynamic.

ROTOR DYNAMICS & TORSIONAL VIBRATION – Basics

  • Introduction & Application.
  • Parameters of Interest.
  • Vibration Analysis Types - Lateral, Torsional, & Axial.
  • Stability & Response.

ROTOR DYNAMICS – THEORY 

  • Rigid Rotor – One degree of freedom free & forces vibration.
  • Simplified Rotor System Behavior – Dynamic vectors (displacement & force), critical speed, phase angle, stability parameter and the effects of system mass, stiffness, and damping .
  • Flexible Rotor – Multi degree-of-freedom system.

ROTOR DYNAMICS – Advanced

  • Synchronous Steady-State Response.
  • Non-Synchronous Time-Transient Response.
  • Balancing Grades & Guidelines.
  • API Standards & Guidelines - Amplification Factor, Critical Response Envelope. Required Separation Margins for Operation Below & Above Critical Speed, Shaft Vibration Orbit properties.

REQUIREMENTS FOR ROTOR DYNAMIC ANALYSES

Modeling
  • Shafting.
  • Disks – Impellers, Couplings, Thrust Collars, Blades, Balanced pistons, etc.
  • Bearings – Fluid-Film & Rolling Element.
  • Seals – Wear-rings, Labyrinth.
  • Housing/Pedestal.
  • Aerodynamic, Steam Whirl, Hydraulic Effects.
  • External Excitations.
  • Gyroscopic Effects.
Analysis
  • Damped & Undamped Rotor Stability.
  • Natural Frequencies.
  • Mode Shapes.
  • Stability & Critical Speed Maps.
  • Response.

ROTOR DYNAMICS DETAILED CASE HISTORY

  • Step-by-Step Rotor-Bearing System Modeling, Analysis, and Problem Solution by the Introduction of Rotor Dynamics Software and its Application to a Rotor-Bearing System.
  • Bearing Interaction with the Rotating Assembly, Oil-Whirl/Whip Phenomena, Rotor-Bearing Response, and Stability Illustrations.

TORSIONAL VIBRATION – Advanced

  • Modeling Considerations – Shaft, Inertia, Coupling, Bearings, Damping, etc.
  • Analysis Types & Generated Results Interpretation.

TORSIONAL VIBRATION DETAILED CASE HISTORIES

  • Simple Two-Disc System.
  • Direct Drive Fixed Speed – 75kw Electric motor driven 4 stage gas booster centrifugal compressor.
  • Synchronous Motor–Gearbox–Compressor Drive Train Start-Up Simulation.
  • Failure Analysis of 2000hp Electric Motor Driving a 4-Throw Reciprocating Compressor and Cost Effective Solution.

STATE-OF-THE-ART TECHNOLOGY PRESENTATION & DEMONSTRATION 

  • Advanced Technology Presentation & Demonstration.
  • Summary of Course Content and Application of Rotating Machinery Dynamics Technologies.

During the session, numerous real life case histories will be presented to illustrate the technology and its application to rotating machinery failure analysis and troubleshooting of common, as well as unique vibration problems.

ARMD Software Training Seminar
Bearings Software, Rotor Dynamics, Torsional Vibration & Application 

This workshop is planned for users/participants who are interested in the detailed modeling and analysis of bearings and rotor/bearing systems utilizing the ARMD™ Software. Participants can bring their own rotating machinery and bearings problems to be presented and discussed in an open session, watch a problem developed and solved, or use the software and create their own models and perform the analysis of their interest. Time will be allocated to discuss FAQs and some details of the ARMD software, which has been used to solve the seminar and end-user sample problems. The workshop will mainly cover the following subjects:

MODEL GENERATION

  • Introduction & Problem Description.
  • Getting the "Right" Parameters.
  • Dividing the Rotating Machine Into Components for Modelling And Integration.
  • Verification of Constructed Model.

SIMULATION

  • Deflection & Load Calculations.
  • Bearing Performance and the Generation of Dynamic Coefficients (Stiffness and Damping).
  • System Natural Frequency, Mode Shapes and Stability Calculations.
  • Critical Speed Map Generation.
  • Stability Map / CAMPBELL Diagram.
  • Synchronous Unbalance Response.
  • Steady-State Response.
  • Non-Synchronous Time Transient Response.

INTERPRETATION OF RESULTS

  • Acceptable Bearing Performance.
  • Rotating Machinery Dynamic Performance and Cost Effective Corrective Action.
  • Comparison/Correlation of Calculated & Measured Machinery Dynamic Performance.

APPLICATIONS

  • Participants' Problems (if available and can be shared).
  • Group/Instructor Sample Problems:
    • Fixed & Tilting-pad fluid-film journal/thrust bearings.
    • Lateral/Torsional rotor dynamics.

The seminar is hosted by RBTS. Attendance is limited. Reservations will be accepted on a first-come, first-served basis and will be confirmed following receipt of registration fee payment or acceptable purchase order.