Mobius Institute

ODS & Modal Analysis Three Day Course

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Have you ever looked at route based spectrums and waveforms in alarm and couldn’t figure out the source of the vibration? Have you ever had difficulty convincing others of your diagnosis? Have you ever diagnosed resonance but didn’t have a recommendation for correction? Operational Deflection Shape (ODS) and Modal Analysis are powerful diagnostic tools that allow the vibration analyst to visualize, analyze and identify corrective actions to solve vibration issues on rotating machines and structures. Even the most experienced vibration analyst will benefit from this unique course and will learn how to use and apply these impressive diagnostic techniques.

Seeing is Believing

Attendees should have a desire to “see” the deformation shape of machines and structures in a way that route based data spectrums and waveforms cannot illustrate. Analyzing ODS or Modal animations with as little as a few or hundreds of test points is extremely effective and a powerful diagnostic tool.

Operational Deflection Shapes

You will learn about planning ODS jobs, phase analysis, instrumentation requirement and how to set up your analyzer to collect time and frequency based projects, ODS data types, and use of ME’scope software to model, animate and analyze ODS projects. Case histories will be presented to illustrate and reinforce what we learn in class about ODS testing.

Modal Analysis

You will learn about planning Modal Analysis projects, resonance testing methods, Modal testing instrumentation, excitation methods, single and multiple degree of freedom test methods, use of ME’scope software to model, animate and analyze Modal projects and methods to avoid and correct resonance including using finite element tools in ME’scope software. Case histories will be presented to illustrate and reinforce what we learn in class about Modal testing.

Topics Covered Phase Analysis Review

  • Diagnosing common faults
  • Measuring phase
  • Visualizing phase data

Operational Deflection Shape Testing

  • When/where to use ODS
  • Planning an ODS job
  • Making ODS measurements, instrumentation requirements, data types
  • Using ME’scope software to draw structures, import data, animate & make movies
  • Interpreting ODS results
  • Case studies

Resonance Testing Methods

  • Choosing an impact device
  • Single & dual-channel impact tests
  • Coast-down testing
  • Negative averaging

Structural Dynamics

  • Natural frequencies, resonance, criticals, mode shapes, nodes, anti-nodes, mass, stiffness & damping

Modal Analysis

  • Theory and planning modal surveys, single & multiple degrees of freedom testing
  • Choosing a driving point, fixed excitation or fixed response, Fmax, resolution & averaging
  • Making modal measurements, modal data types & instrumentation requirements
  • Using ME’scope software to draw, import data & animate modal data
  • Curve fitting modal data
  • Analysis & interpretation of modal results

Correcting and avoiding resonance

  • Evaluate structural modification options in ME’scope software using the Structural Dynamics Modification tools (SDM)
  • Reducing the force exciting resonance using precision balancing & alignment
  • Change the speed or use VFD frequency blocking

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