COURSE OVERVIEW:

Understanding the dynamic behavior of rotating shafts is essential for the reliable operation of high-speed industrial machinery. This course delves into the complex phenomena of critical speeds and resonance, which occur when the rotational frequency of a machine coincides with its natural mechanical frequencies. Participants will explore the theoretical foundations of rotor dynamics, focusing on how mass distribution, stiffness, and damping influence the vibration characteristics of centrifugal pumps, compressors, and turbines.

The scope of this coverage extends from basic single-degree-of-freedom models to the sophisticated behavior of multi-stage rotors. We will examine the Campbell Diagram and its role in predicting interference points between excitation forces and structural natural frequencies. Special attention is given to the "critical speed" transition, where the rotor moves through its natural frequency, and the specific damping requirements necessary to prevent catastrophic amplitudes of vibration during startup and shutdown sequences.

Furthermore, the course addresses practical engineering solutions for identifying and mitigating resonance issues in the field. Attendees will learn how to conduct impact testing (bump tests), analyze Bode and Polar plots, and evaluate the influence of bearing stiffness and support structures on system dynamics. By mastering these concepts, engineers and technicians can diagnose "hidden" vibration problems that do not respond to standard balancing and alignment, ensuring the long-term structural integrity of critical rotating assets.

COURSE OBJECTIVES:

After completion of this course, the participants will be able to:

1. Define the concepts of natural frequency, resonance, and critical speed.
2. Differentiate between lateral and torsional resonance in rotating shafts.
3. Interpret Campbell Diagrams to identify potential interference speeds.
4. Analyze the effect of rotor mass and stiffness on the first critical speed.
5. Evaluate the role of damping in controlling vibration during resonance.
6. Identify the symptoms of "Critical Speed" during machine coast-down.
7. Perform and interpret impact (bump) tests on stationary equipment.
8. Use Bode and Polar plots to pinpoint resonance frequencies.
9. Assess the impact of fluid film bearing stiffness on rotor dynamics.
10. Determine the difference between rigid and flexible rotor classifications.
11. Implement structural modifications to shift natural frequencies away from operating speeds.
12. Diagnose resonance issues caused by piping and foundation interactions.
13. Formulate a vibration mitigation strategy for machines operating near critical speeds.

TARGET AUDIENCE:

Reliability Engineers, Vibration Analysts, Rotating Equipment Engineers, Design Engineers, and Advanced Maintenance Technicians working with high-speed turbomachinery.

TRAINING COURSE METHODOLOGY:

A highly interactive combination of lectures, discussion sessions, and case studies will be employed to maximise the transfer of information, knowledge, and experience. The course will be intensive, practical, and highly interactive. The sessions will start by raising the most relevant questions and motivating everybody to find the right answers. The attendants will also be encouraged to raise more of their questions and to share in developing the right answers using their analysis and experience. There will also be some indoor experiential activities to enhance the learning experience. Course material will be provided in PowerPoint, with necessary animations, learning videos, and general discussions.

The course participants shall be evaluated before, during, and at the end of the course.

COURSE CERTIFICATE:

National Consultant Centre for Training LLC (NCC) will issue an Attendance Certificate to all participants completing a minimum of 80% of the total attendance time requirement.