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RBTS Album 1 - Service Examples

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RECIPROCATING COMPRESSORS - ELECTRIC MOTOR DRIVE
Equipment:  4,700 HP Ansaldo Electric Motor Drive with Ariel JGC/6 Compressor
    Services provided:
  • Torsional Vibration Study (Natural Frequency, Forced Response, Shaft Fatigue)
  • Variable Frequency Drive and Motor Current Pulsation Studies
  • Coupling and Flywheel Selection (Rigid and Soft Couplings)
  • Field testing of shaft torques, coupling performance, vibration survey
RECIPROCATING COMPRESSORS - TURBINE DRIVE
Equipment:  1,100 HP Solar Saturn Turbine Driver with Ariel JGE/6 Compressor
    Services provided:

  • Torsional Vibration Study (Natural Frequency, Forced Response, Shaft Fatigue)
  • Lateral Rotor Dynamic Study of Turbine and Gear Box Shafting
  • Coupling and Flywheel Selection (Rigid and Soft Couplings)
  • Field testing of shaft torques, coupling performance, vibration survey
JARVIK HEART PUMPS
    Services provided:

  • Blood lubricated bearings design and analysis
  • Rotor/bearing system dynamic analysis and design
  • Finite element analysis (FEA) for operational stresses, strength, fatigue, fracture mechanics, and impact studies
  • Accelerated wear test rig design and testing
CONE CRUSHER BEARING
Socket Bearing Failure Analysis and Design Modification
    Services provided:

  • Performance evaluation of socket liner bearing including determination of ball motion (displacement, velocity, and acceleration), heat generation, and flow rates.
  • Grooving design modifications for improved flow and heat removal.
RECIPROCATING COMPRESSORS - ENGINE DRIVE
Equipment:  2,000 HP JGT/6 Ariel Compressor with Waukesha 9390 Engine Drive
    Services provided:

  • Torsional Vibration Study (Natural Frequency, Forced Response, Shaft Fatigue, Damper Loads)
  • Coupling and Flywheel Selection (Rigid and Soft Couplings)
  • Field testing of shaft torques, coupling and damper performance, vibration survey
SCREW COMPRESSORS - ENGINE DRIVE
Equipment:  Aerzen Screw Compressor with Waukesha 7042 Engine Drive and Voith Fluid Coupling
    Services provided:

  • Torsional Vibration Study (Natural Frequency, Forced Response, Shaft Fatigue, Damper Loads)
  • Coupling and Flywheel Selection (Rigid and Soft Couplings)
  • Field testing of shaft torques, coupling and damper performance, vibration survey
GENERATOR SETS - ENGINE DRIVE
Equipment:  6 Megawatt Generator with Cooper Bessemer LSV16 – SG Engine Drive
    Services provided:

  • Torsional Vibration Study (Natural Frequency, Forced Response, Shaft Fatigue)
  • Design of spool piece connection between Engine and Generator
  • Electrical Pulsation Study
  • Field testing of shaft torques, coupling performance, vibration survey
HYDRO-TURBINE GUIDE BEARING
Bearing Failure Evaluation and Recommendations
    Services provided:

  • Detailed bearing modeling and performance evaluation under normal and run away speed operating conditions.
  • Identification of bearing failure due to lack of hydrodynamic load support at run away speed conditions.
  • Demonstration of bearing performance to satisfy required operation with higher viscosity oil.
CENTRIFUGAL COMPRESSORS
Equipment:  66,000 HP Air Compressor with Synchronous Motor Drive
    Services provided:

  • Torsional Vibration Study (Natural Frequency, Forced Response, Sync. Motor Startup, Shaft Fatigue)
  • Lateral Rotor Dynamic Study of Motor, Gear Box, Compressor Shafting
  • Coupling and Flywheel Selection (Rigid, Soft, Controlled Slip Couplings)
  • Field testing of shaft torques, coupling performance, vibration survey
FIELD TESTING OF ROTATING EQUIPMENT
Torsional Strain Gages with Radio Telemetry on Motor Drive Extension
    Services provided:

  • Torsional Vibration Monitoring (Strain gages, Optical Encoder, Laser Vibrometer)
  • Lateral Vibration Monitoring (Proximity Probes, Accelerometers, Etc.)
  • Monitoring of Bearing Performance (Vibration, Temperature, Orbits)
  • Vibration Surveys
SPECIALIZED FIELD TESTING
Strain Gages with Radio Telemetry on Motor Spider Assembly
    Services provided:

  • Design of Test Protocol
  • Selection of Sensors (Strain gages, Accelerometers, Proximity Probes, LVDT, Vibrometers, Etc.)
  • Selection of Signal Conditioning and Data Acquisition Hardware (Telemetry, Computers, Tape, Etc.)
FORENSIC INVESTIGATIONS
Weld Failures in Motor Rotor Assembly
    Services provided:

  • Metallurgical Evaluations
  • Fatigue/Stress Evaluations, Fracture Mechanics
  • Supporting Analytical Studies (Finite Element, Torsion, Rotor Dynamics)
400MW STEAM-TURBINE-GENERATOR SET
High Sub-Synchronous Vibration Root Cause Evaluation and Correction.
    Services provided:

  • Lateral vibration monitoring including startup and coast down.
  • Bearings performance monitoring - vibration, orbits, temperature and flows
  • Rotordynamics detailed study of drive train and support bearings.
  • Identification of experienced sub-synchronous vibration root cause.
  • Eliminating sub-synchronous vibration by bearing design modification.
FORENSIC INVESTIGATIONS
Torsional Failure in Motor Drive End Shaft
    Services provided:

  • Metallurgical Evaluations
  • Fatigue/Stress Evaluations, Fracture Mechanics
  • Supporting Analytical Studies (Finite Element, Torsion, Rotor Dynamics)
RBTS provides both field and analytical rotating machinery dynamics engineering services for shipboard equipment. For this type of application, RBTS has provided field measurements and analytical services to understand and solve a wide variety of torsional and later rotordynamic problems.
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