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Towards active engine mounting systems for commercial vehicles: modeling and analysis

Författare och institution:
Hoda Yarmohamadi (Institutionen för tillämpad mekanik, Dynamik)
Serie:
Technical report - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, ISSN 1652-8565; nr 2009:04
ISBN:
1652-8565
Antal sidor:
80
Publikationstyp:
Licentiatavhandling
Förlag:
Chalmers University of Technology
Förlagsort:
Göteborg
Publiceringsår:
2009
Språk:
engelska
Datum för examination:
2009-03-06
Tidpunkt för examination:
13:15
Lokal:
Konferensrum Omega 2, Chalmers Södra, Eklandagatan 86, Göteborg
Opponent:
Doktor Johan Jonsson, Vectura, Göteborg
Inkluderade delarbeten:
Sammanfattning (abstract):
The vehicle engine mounting system, which consists of several mounts connecting the engine to the vehicle structure, not only supports the weight of the engine but also isolates the noise, vibration and the transmitted forces to the vehicle structure. At present conventional elastomeric mounts are widely used in engine mounting systems for commercial vehicles. However, these mounts cannot fulfill the conflicting characteristic requirements for the best isolation concerning both road and engine induced vibrations. Therefore, to improve the noise and vibration isolation of commercial vehicles it is necessary to go beyond traditional passive isolators and use semi-active or active vibration control systems due to their capabilities of addressing the conflicting requirements in different road and engine conditions. The aim of the research presented in this thesis is to first develop mathematical and computational models of elastomeric engine mounts for heavy trucks and investigate the nonlinear behavior of dynamic stiffness and damping of the mounts, and finally use the developed models to design and analyze an adaptronic engine mounting system. Adaptronic engine mounting system is referred to a mounting system where actuators, sensors and controller are optimally incorporated in the conventional elastomeric mounting system. The developed computational model of the engine mounts is implemented in Matlab/ Simulink and used in a 3D engine model with which vibration dynamics analysis under different engine and realistic road inputs is conducted. Moreover, the possibility and advantages of using active engine mounts have been studied by incorporating actuators into the above mentioned 3D engine model with conventional mounting system for heavy trucks. Simulations of the engine vibration dynamics under similar engine and road excitations have been done for the adaptronic mounting system and compared to the results from the conventional engine mounting system. The results of simulations of engine vibration dynamics and transmitted forces to the vehicle structure have shown good potential for vibration isolation improvement in heavy trucks by using adaptronic engine mounting systems.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
TEKNIK OCH TEKNOLOGIER ->
Maskinteknik ->
Teknisk mekanik
TEKNIK OCH TEKNOLOGIER ->
Maskinteknik ->
Farkostteknik
TEKNIK OCH TEKNOLOGIER ->
Materialteknik ->
Annan materialteknik ->
Övrig teknisk mekanik
Nyckelord:
Commercial vehicles, Conventional engine mount, Computational model, Nonlinear dynamic stiffness and damping, Vibration isolation, Model errors tolerance, Adaptronic mounting system, Actuators
Postens nummer:
90421
Posten skapad:
2009-02-25 16:23

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