Lateral Vibration Analysis

Lateral Vibration, Rotor Dynamics Analysis

INERTANCE has performed the Lateral Vibration Analysis (Rotor Dynamics Analysis) with necessary design tools for turbo-machinery that includes centrifugal and axial compressors, centrifugal pumps, steam & gas turbines, motors, and gear applications. The rotor components including blades, impellers, etc have been modeled based on manufactured drawings, which can generate a mass-elastic Rotor Dynamics Analysis model of rotor assembly. Those analysis includes the critical speed map, unbalance response, stability analysis, etc.

Rotor Dynamics Analysis
Rotor Dynamics Analysis

INERTANCE has a capability to perform below kinds of rotor dynamics analysis.

  • Lateral vibration analysis
  • Rotor dynamics analysis
  • Damped eigenvalue (Critical speed) analysis
  • Undamped critical speed map
  • Train lateral vibration analysis
  • Mode shape
  • Campbell diagram analysis
  • Bearing stiffness and damping coefficients
  • Separation margins as per API requirements
  • Forced response analysis (Unbalance response analysis)
  • Bearing clearance assessment
  • Stability analysis
  • Log decrement
  • Oil whirl and whip against rotor instabilities
  • Transient analysis
  • Forward and backward mode
  • As per API 610, 611, 612, 617, 672, 684, etc. (Any other API Standard)

In addition, the linearized coefficients are calculated for various bearing types with application of any seal type step by step. INERTANCE can provide various kinds of rotor dynamics analysis as requested in API standards as below.

Here, INERTANCE can show the various type of lateral vibration analysis as follows;

 

Lateral Vibration Analysis for Centrifugal Pump
Lateral Vibration Analysis for Centrifugal Pump

 

Undamped Critical Speed Map

Undamped critical speed analysis is very useful to understand the critical speed and mode shape characteristics briefly. Based on undamped critical speed map, the amplification factor as well as rotor behavior can be predicted.

Undamped Critical Speed Map
Undamped Critical Speed Map

 

Mode Shape

Mode shape provides the approximate displacement of rotor relatively around critical speed, and it is determined that the unbalance location with phase is applied for response analysis.

Mode Shape by Rotor Dynamics Analysis
Mode Shape by Rotor Dynamics Analysis

 

Unbalance Response Analysis

Damped unbalance response analysis is performed to check the adequate separation margin between critical speeds and operating speeds, as well as to check  internal clearance limitation against rubbing, etc.

Unbalance Response Analysis
Unbalance Response Analysis

 

Level I, II Stability Analysis

The rotor stability analysis is used to estimate the high amplification factor of first critical speed for sensitive machine, and it is composed with simplified Level I and detailed Level II analysis.

Example for Level I Stability Analysis as per API 617
Example for Level I Stability Analysis as per API 617

 

Example for Level I Stability Density Map as per API 617
Example for Level I Stability Density Map as per API 617

 

Example for Level II Stability Analysis as per API 617
Example for Level II Stability Analysis as per API 617

INERTANCE has a capability regarding noise and vibration engineering, and our experts are familiar with assessment of Lateral Vibration Analysis. For further information, contact us at (admin@inertance.com).

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