Vibro-acoustic condition monitoring of Internal Combustion Engines: A critical review of existing techniques

In view of the recent needs of the industry to (−) optimize component structural durability adopting long-life cycles, (−) verify the engine final status at the end of the assembly line and (−) reduce the maintenance costs monitoring the ICE life during vehicle operations, monitoring and diagnosing system requests are continuously growing up. The present review can be considered a useful guideline for test engineers in understanding which types of fault can be diagnosed by using vibro-acoustic signals in sufficient time in both test bench and operating conditions and which transducer and signal processing technique (of which the essential background theory is here reported) could be considered the most reliable and informative to be implemented for the fault in question.