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HDV Simulink Real World Model for Testing: A Study on Model Simplicity
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Simulink omvärldsmodell av tungt fordon för test : En studie i enkelhet (Swedish)
Abstract [en]

 

The purpose of this thesis was to investigate the area of model complexity and see what precautions could be made to avoid the generation of complex models. These findings included five principles stated by M. Pidd which were implemented in the development of a new Simulink real world model of a heavy duty vehicle.

The developed model was integrated into a hardware-in-the-loop configuration and parameterized and validated by comparing the new model to the previous model in several advanced emergency brake test cases. Additional testing was done to prove the overall robustness and validity of the new model.

With an average relative error of 2% compared to measurement data of the previous model and the additional testing considered passed, the new model was deemed valid and representative of a heavy duty vehicle. The study recommends that further simplifications are done in the hardware integration framework, which have not been targeted in this thesis, to reduce the complexity of the overall model further.

All and all the new model met the deliveries and due to its less complex structure and maintained validity it was implemented at the REVT department at Scania CV AB.

Abstract [sv]

Syftet med det här examensarbetet var att undersöka ämnet modell komplexitet och se vilka åtgärder som kan vidtas för att undvika skapandet av komplexa modeller. Studien inkluderar fem principer skrivna av M. Pidd vilka implementerades i skapandet av en ny Simulink omvärldsmodell av ett tungt fordon.

Den utarbetade modellen integrerades i ett hardware-in-the-loop ramverk och parametriserades och validerades genom att jämföra den nya modellen mot den gamla i ett flertal testfall för den avancerade nödbromsen. Ytterligare tester genomfördes även för att bekräfta hållbarheten och giltigheten hos den nya modellen.

Med ett snitt relativt fel på 2 % jämfört med mätdata från den tidigare modellen och godkänt resultat från de ytterligare testerna, ansågs den nya modellen vara en giltig och representativ avbild av ett tungt fordon. Studien rekommenderar att ytterligare förenklingar görs på hårdvaruramverket, som inte har berörts i det här arbetet, för att reducera komplexiteten hos modellen i helhet ytterligare.

Överlag så levde modellen upp till alla krav och på grund av dess reducerade komplexa struktur och bibehållna giltighet, implementerades den på REVT avdelningen på Scania CV AB.

Place, publisher, year, edition, pages
2016.
Series
TRITA-MAT-E, 2016:40
National Category
Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-188915OAI: oai:DiVA.org:kth-188915DiVA: diva2:940927
External cooperation
Scania CV AB
Subject / course
Optimization and Systems Theory
Educational program
Master of Science - Aerospace Engineering
Supervisors
Examiners
Available from: 2016-06-21 Created: 2016-06-21 Last updated: 2016-06-21Bibliographically approved

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