Identification of Torsional Vibration Modal Parameters: Application on a Ferrari Engine Crankshaft

  • Emilio Di LorenzoEmail author
  • Fabio Bianciardi
  • Simone Manzato
  • Simone Delvecchio
  • Claudio Manna
  • Karl Janssens
  • Bart Peeters
Conference paper
Part of the Applied Condition Monitoring book series (ACM, volume 15)


Comfort plays a very important role in the development of cars. The pistons firing order of an internal combustion engine, by nature, do not generate a constant torque on the crankshaft. At specific crankshaft speed, where the engine’s excitation frequency and the driven-system’s natural frequency coincide, torsional vibrations can excite crankshaft resonances and other dynamic phenomena within the engine or further down the driveline, potentially leading to fatigue failure of the crankshaft, or to important NVH problems. In order to achieve very high standards, the behavior of the driveline system needs to be investigated. For this reason a technique named Torsional-Order Based Modal Analysis (T-OBMA) has been developed in order to identify the torsional resonance frequencies and their related damping ratios of driveline systems during operating conditions. The technique is based on the rotational speed measurements acquired in two or more points along the driveline. The modal parameters are identified from torsional orders measured during an engine speed runup. The technique has been validated in a simulation and in an industrial test environment identifying crankshaft modal parameters on a Ferrari engine.


NVH Modal Analysis Order tracking Powertrain analysis Torsional vibrations 


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Emilio Di Lorenzo
    • 1
    Email author
  • Fabio Bianciardi
    • 1
  • Simone Manzato
    • 1
  • Simone Delvecchio
    • 2
  • Claudio Manna
    • 3
  • Karl Janssens
    • 1
  • Bart Peeters
    • 1
  1. 1.Siemens Industry Software NVLeuvenBelgium
  2. 2.NVH ConsultantFerraraItaly
  3. 3.Ferrari S.p.A.MaranelloItaly

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