1,720,976 research outputs found
Suspension lower control arm case study: enhancing lightweight and vibration reduction
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
IDRApegasus: a fuel-cell prototype for 3000 km/L
No full textHigh performances and low consumptions: this is the challenge for the Team H2politO's members from Politecnico di Torino -Italy. Different technologies have enabled to design and manufacture the vehicle IDRApegasus, a hydrogen prototype, for the Shell Eco-marathon (SEM), an international competition for low consumption vehicles. The target is very sophisticated: to achieve over 3000 km with the energy equivalent of 1 L of petrol, using a 200 W electric motor to move a vehicle of 33 kg. In order to win this challenge, students have used innovations in every technical field: mechanics, aerodynamics, electronic and powertrai
DESING AND NUMERICAL MODELLIZATION OF CFRP INNOVATIVE TRANSVERSAL LEAF SPRING
No full textThis paper describes the design and the numerical modelization of a novel prototype's transverse CFRP leaf-spring for a multilink suspensio
In-wheel and on-board motors in BEV: lateral and vertical performance comparison
Full text linkFollowing the electrification trends in the automotive sector, many powertrain architectures are being studied, and among them a very interesting possibility – not yet fully developed – regards the use of in-wheel motors. This kind of electric machine positioned inside the wheel rims grants the vehicles great design freedom and opens numerous possibilities in terms of vehicle control, however some issues regarding handling and comfort are raised with the increase of the unsprung mass. This paper proposes a comprehensive study, combining the electric modelling of the motors, inverter, and battery using Simulink and its co-simulation with multibody simulation in Adams/CAR, in such a way that a full electromechanical coupling is achieved, and a full range of dynamic phenomena can be inquired both for an in-wheel and an onboard EV setup. The paper focuses on lateral and vertical performance, since they represent the main controversies in the adoption of in-wheel motors, and promising results are obtained
Numerical and experimental stiffness evaluation of CFRP leaf and coil springs
No full textThis paper presents the design, manufacturing and testing of Carbon Fibre-Reinforced Polymer (CFRP) springs for lightweight automotive applications. A first test case consists of a leaf spring, which was optimized for the use in a small car. A design method made guided by a multilevel numerical modelling is developed to evaluate the influence of the chassis-leaf spring connection on the suspension stiffness. Experimental tests showed good accordance with the numerical prediction, justifying the goodness of the spring design, in terms of both static stiffness and strength. As a second test case, a low-pressure Resin Transfer Moulding is proposed for the manufacture of composite coil springs with non-flattened, open ends. A non-conventional fixture is here presented for the experimental measure of the stiffness of multiple coil springs with different geometries, with a sustainable cost. The experiments show that numerical predictions overestimate the experimental stiffness by at most 34%, suggesting that the manufacturing process might still be tailored for better predictability
Feasibility Study of an Innovative Urban Electric-Hybrid Microcar
Full text linkThis paper presents the feasibility study of a new platform for electric-hybrid quadricycles, developed by addressing important concepts like passive safety and comfort, which often represent a shortcoming in this vehicle category. Starting from packaging of energy storage system and macroscopic subsystems as the main technological constraint, the study has been entirely developed in a virtual environment, with finite element verifications on preliminary models, and a subsequent cooperation phase between computer aided design and finite element analysis softwares, with a guideline for the main tests being that each could feasibly be carried out on a complete vehicle model in order to validate the original assumptions. The resulting design, with a body curb mass of less than 100 kg, was capable of integrating optimal static stiffness characteristics and crash performance, together with improved vehicle dynamics thanks to an innovative suspension archetype
From thermosetting to thermoplastic composite materials: automotive applications in structural components
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