Engine Internal Dynamic Force Identification and the Combination with Engine Structural and Vibro-Acoustic Transfer Information LMS Engineering Services

Format:

Conference/Event

Author/Creator:

Van Herbruggen, J., author.

Conference Name:

SAE 2001 Noise & Vibration Conference & Exposition (2001-04-30 : Grand Traverse, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2001

Summary:

The vibration-generating mechanisms inside an engine are highly non-linear (combustion, valve operation, hydraulic bearing behavior, et cetera). However, the engine structure, under the influence of these vibration-generating mechanisms, responds in a highly linear way.For the development and optimization of the engine structure for noise and vibration it is beneficial to use fast and simple' linear models, like linear FE-models, measured modal models or measured FRF-models.All these models allow a qualitative assessment of variants without excitation information. But, for true optimization, internal excitation spectra are needed in order to avoid that effort is spent to optimize non-critical system properties.Unfortunately, these internal excitation spectra are difficult to measure. Direct measurement of combustion pressure is still feasible, but crank-bearing forces, piston guidance forces et cetera can only be identified indirectly. Inverse identification of the main internal excitations through operational acceleration measurements, combined with laboratory tests of FRF matrices, is the only possibility.This paper discusses inverse engine internal force identification using operational accelerations and laboratory FRF-matrices and the use of engine FRF matrices to assess modifications and variants with and without this excitation information

Notes:

Vendor supplied data

Publisher Number:

2001-01-1596

Access Restriction:

Restricted for use by site license