An Approach for Dynamic Response Correlation of Exhaust System between Measurements and FE-Simulations Tenneco Incorporated

Format:

Conference/Event

Author/Creator:

Zhou, Zhou, author.

Conference Name:

International Powertrains, Fuels & Lubricants Meeting (2010-05-05 : Rio De Janeiro, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Study and design of the lifetime durability of mechanicalcomponents in an automotive exhaust system becomes a challengingtask today for engineers. During the investigation, bothexperimental tests and finite element simulations are used for theinvestigation under dynamic engine excitations. For the dynamicfinite element analysis, the experimental system must be simplifiedas a linear mathematic model and real boundary conditions areidealized. Due to this simplification, the dynamic behavior of thefinite element model may strongly deviate from that in operationalconditions. To gain insight into the dynamic behavior of exhaustsystems from simulations, the finite model must be modified basedon experimental results.As known the harmonic response is related to modal shapes andengine loads. Therefore, modifications of the finite element modelcan be done from these two aspects. Tenneco has developed anapproach for correlation between measurements and FE simulationswith respect to the harmonic response in full exhaust systems. Inthis approach model updating and input load compensation arecombined. To evaluate the dynamic response correlation betweenmeasurements and FE simulations, the Modal Assurance Criterion(MAC) is used which gives a global number between 0 ~ 1 for howgood the correlation is between the two. By use of this approach,MAC values are improved and the validation process of the finiteelement simulation is speeded up. Tenneco has been making effortsto validate FE simulations with respect to computational speed androbustness. This tool provides an important contribution to thisobjective

Notes:

Vendor supplied data

Publisher Number:

2010-01-1569

Access Restriction:

Restricted for use by site license