Refine
Document Type
- Article (2)
- conference proceeding (article) (1)
- Part of Periodical (1)
Is part of the Bibliography
- no (4)
Keywords
- Leaf spring suspension (1)
- MATLAB (1)
- Simulink (1)
- TMeasy tyre model (1)
- Vehicle modelling (1)
- beam-model (1)
- commercial vehicles (1)
- coupled air springs (1)
- design Kinematics (1)
- design kinematics (1)
Institute
Begutachtungsstatus
- peer-reviewed (3)
Forschungsbericht 2016
(2016)
Im Bosruck-Eisenbahntunnel kam es in Folge v on intensivem Sulfatangriff durch Thaumasitbildungen zu erheblichen Betonschäden. Bisher sieht das Regelwerk (ÖNORM B 4710-1 und ÖVBB-RL Spritzbeton) bei Sulfatangriff den Einsatz von C 3A-freien Bindemitteln vor – dies gilt auch für Spritzbeton. Untersuchungen haben gezeigt, dass C 3A-freier Zement keinen wesentlich verbesserten Widerstand gegen den Thaumasit-Sulfatangriff aufweist. Im Zuge der Tunnelinstandsetzung war es das vorrangige Ziel, Spritzbeton mit erhöhtem Widerstand gegen Thaumasit-Sulfatangriff und ausreichender Frühfestigkeit zu entwickeln. In diesem Beitrag werden neu entwickelte Mischungsansätze und deren Umsetzung im Labormaßstab vorgestellt. Die mechanischen Kennwerte dieser Rezeptur (z.B. Frühfestigkeitsentwicklung) sowie die Ergebnisse der Dauerhaftigkeitsuntersuchungen zeigen, dass eine Rezeptur mit optimiertem Bindemittelgehalt die hohen Anforderungen im Tunnel erfüllen kann. Die Erfahrungen aus der praktischen Umsetzung im Zuge der Instandsetzungsarbeiten des Bosruck-Eisenbahntunnels im Jahre 2016 waren positiv.
The development of new technologies like advanced driver assistance systems or automated driving requires a flexible simulation environment of sufficient complexity. In general this flexibility is not provided by commercial software packages. This paper presents a three-dimensional and nonlinear hand-made model for heavy commercial vehicles including tractor and trailer as well as tractor and semitrailer combinations that can be used in different simulation environments, as well as in real-time applications. As typical for trucks, the torsional flexibility of the frame and a suspended driver's cabin are taken into account. The design kinematics makes it possible to handle different and quite complex axle suspensions very efficiently. Appropriate force elements are used to model various couplings between tractor and trailer or tractor and semitrailer, respectively. The virtual test truck environment (VTT) coded in ANSI C is extremely portable and can easily be embedded in commercial simulation packages like MATLAB/Simulink. It includes the TMeasy tyre model and offers flexible interfaces to third-party software tools.
Axles with leaf spring suspension systems are still a popular choice in many commercial vehicles. However, leaf springs are not in perfect conformity to standard multibody vehicle models because they combine guidance and suspension in one single element. Combining standard multibody vehicle models with sophisticated finite element leaf spring models results in rather complex and computing time-consuming solutions. Purely kinematic models, defined by lookup tables or the design kinematics approach, cover only some but not all features of the leaf spring suspension. As shown here, the five-link model, which incorporates a quasi-static solution of the leaf spring compliance, provides a very practical model. It is comparatively lean and provides results of sufficient accuracy in the whole application range.