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  • Measurement And Analysis Of Torsional Vibration
    Torsional vibration is of key importance in the area of vehicle development and refinement. The main contributory source is the engine where periodically occurring combustion cycles cause variation in the crankshaft rotary vibration. This vibration is transmitted to and modified further by other
  • Measuring Torsional Vibration on a Natural Gas Engine/Reciprocating Compressor System (.pdf)
    This case history describes how torsional vibration was measured on a natural gas engine driving a reciprocating. compressor. It was necessary to check torsional vibration on the front of the engine where the viscous damper was located. Engineering Dynamics Incorporated (EDI) is an industry leader
  • Gas Turbine Vibration Monitoring in a Refinery
    CAS DataLoggers has just provided the Delphin vibration monitoring and analysis solution for a refinery relying on a gas turbine-driven generator to provide power for the facility. The generator has begun to develop vibrations in its shafts and bearings, causing fatigue failures. Technicians needed
  • An Integrated Approach to Engine Radiated Acoustics
    Numerical Engine Acoustics uses excitation forces obtained from dynamic multibody analysis using Virtual.Lab Motion, from external calculations or from mearsurements. With this dynamic load data and the structural modes, the surface vibrations are evaluated for multiregime conditions from which
  • Waterfall Analysis: Frequency Resolution and Smearing
    When measuring noise and vibration in rotating machines, especially complex devices like automobile engines, it is very important to fully understand what is being measured and what analyses need to be performed on the resulting data. Even the most sophisticated measurement systems will not produce
  • Say goodbye to shift clunking
    A propeller hub isolator virtually eliminates noise, vibration, and harshness effects perceived as "shift clunk " when boat pilots shift engines into gear. Mercury Marine manufactures Flo-Torq IV isolators at its plant in St. Cloud, Fla. The isolators currently serve on production models
  • Designers introduction to FEA
    Most introductory classes in finite-element analysis probably breeze over the details that would explain exactly what the software is doing and why. An industrial robot and car engine (engine block not shown) are both mechanisms. The chart classifies FEA problems in solid mechanics. The base plate
  • LMS Engineers Quickly Reduce Automobile NVH to Best-in-Class Levels
    competitor. LMS used source ranking and benchmarking analysis, investigation of critical noise path, and counter measure evaluation by frequency response function (FRF) testing to determine the root cause. The primary contributors were airborne noise and noise transferred through the engine mounts. A new

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