Dynamic analysis of a front-end accessory drive with a decoupler/isolator

Raghavan Balaji, Eric M. Mockensturm

Research output: Contribution to journalArticle

18 Scopus citations


In automotive front-end accessory drives (FEAD), the crankshaft supplies power to accessories like alternators, pumps, etc. When the FEAD undergoes forced vibration due to crankshaft excitation, dynamic tension fluctuations can cause the belt to slip on the accessory pulleys. In this paper, an accessory inertia (e.g. alternator) is isolated/separated from the FEAD by placing between the pulley and accessory a combination of a one-way rigid clutch and an isolator spring. The rotational response of a typical FEAD is extended to include this decoupler-isolator. Analytical solutions are obtained by considering it as a piecewise-linearised system about the equilibrium angular displacements. The tension fluctuation of the ordinary FEAD is then compared to that of the system with a decoupler/isolator. The results indicate that within the practical working range of engine speeds, use of either an isolator or a decoupler-isolator could significantly lower the dynamic tension drop across the accessory pulley.

Original languageEnglish (US)
Pages (from-to)208-231
Number of pages24
JournalInternational Journal of Vehicle Design
Issue number3
StatePublished - 2005

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Mechanical Engineering

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