A Basis for the Vibration Monitoring of Diesel Fuel Injectors

This paper presents the analytical and experimental procedures used in the estimation of key fuel injection parameters from monitored vibration data. The mechanical and flow-induced sources of vibration in a fuel injector are described, and the features of the resulting vibration response of the injector body are discussed. Experimental engine test and data acquisition procedures are detailed, and the use of an out-of-the-engine test facility to confirm injection-dependent vibration response is outlined.