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Hybrid Approach for the Assessment of Paths in Pass by Manoeuver

Centro RIcerche Fiat S.C.p.A.-Domenico Amodeo
Centro Ricerche Fiat S.C.p.A.-Marco Danti, Massimo Biasiolo
  • Technical Paper
  • 2020-01-1550
To be published on 2020-06-03 by SAE International in United States
Current vehicle regulations demand for a challenging decrease in the overall exterior noise as a benefit for the health of citizens and road users. New limits have been implemented in UN R51.03 (based on ISO 362-1:2015) to reduce the emitted noise both at constant speed and in full load so as to cover most of the real urban driving conditions. In order to achieve those targets the carmakers have to refine the trim of their vehicle and an experimental approach can take place too late. This paper shows a method for the pass by noise simulation exploiting the numerical transfer functions and a library of experimentally characterized sources with the aim to reduce the noise and find out a better tradeoff between costs and effectiveness of the modifications. Moreover a simple software tool for the treatment of the data and to ease the workflow has been created and used for the rank assessment of the different paths.
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Diesel Engine Technologies Evolution for Future Challenges

Centro Ricerche Fiat S.C.p.A.-Marco Tonetti, Giorgio Rustici, Massimo Buscema
FCA Italy S.p.A.-Luca Ferraris
Published 2017-09-04 by SAE International in United States
Final Euro6d emission legislation with the new homologation cycle and Real Driving Emission requirements has set a strong challenge for the ICE Passenger Car applications.Thanks to their well-known low fuel consumption characteristics, Diesel Engines can play a key role for the fulfillment of the European 2020 CO2 fleet target but need to confirm their capability to fully control noxious emissions even in extreme operating conditions, while restraining the overall engine costs and complexity.CO2 and NOx emissions reduction are considered the main drivers for diesel engine evolution. In this perspective, Exhaust Gas After-treatment and Combustion System have been identified as the two main technology aspects to be developed.The purpose of this paper is to describe the evolution paths of these two technologies and the results achieved so far in terms of noxious emissions reduction.A methodology has been developed to predict Diesel combustion evolution and its main characteristics. Various combustion chambers and fuel injection systems have been analyzed through simulations, selecting the most promising ones to be tested on the engine test bench.Having the NSC (NOx Storage…
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Numerical Investigation in a Gear Drive of an Engine Balancing Unit with Respect to Noise, Friction and Durability

Centro Ricerche Fiat S.C.p.A.-Chiara Sessarego, Giorgio Spanu
AVL LIST GmbH-Thomas Resch
Published 2015-09-06 by SAE International in United States
This paper presents a methodology for numerical investigation of a full flexible balancer drive together with engine and crank train under realistic operating conditions where shaft dynamics, gear contact and rattle impacts, gear root stresses and friction losses in bearings and gear interaction are taken into account and can be balanced against each other to achieve the design criteria.Gear rattle is driven by the speed fluctuation of the crank train, the resistance torque (mainly friction), shaft inertia and the backlash in the gears. The actual trend to engine downsizing and up-torqueing increases the severity to rattle as engines are running on higher combustion pressures. This increases torque and speed fluctuation, which makes the detailed investigation in this torque transfer even more demanding.A common method to reduce gear rattle is the usage of so-called scissors gears. The layout of those gears has significant influence on the gear durability and the overall losses, which requires a detailed and precise model to find the best compromise for the spring stiffness and preload.The investigation is shown for a modern…
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Multi-Objective Optimization of a Car Body Structure

SAE International Journal of Passenger Cars - Mechanical Systems

Centro Ricerche Fiat S.C.p.A.-Rosario Raniolo, Marco Danti
Centro Ricerche Fiat S.C.p.A., AGH University-Jakub Korta
  • Journal Article
  • 2012-01-1555
Published 2012-06-13 by SAE International in United States
In the last years engineers have to deal with multiple, often conflicting targets, where improvement of one quantity leads to deterioration of others, therefore it is impossible to obtain simultaneous structure enhancements without automatic optimizations tools. The so-called trade-offs have to be applied, providing less efficient modifications, nevertheless, for all of the design objectives. The Pareto front is a method that helps to determine a set of equipotential designs.In order to explore entire design space, response surface methodology supplemented by genetic algorithms is often used. In the work presented, the Gaussian Processes Methodology and an Adaptive Range Multi-Objective Genetic Algorithm - ARMOGA were implemented. Basing on the solutions obtained by the design of experiment, response surface methodology is used to predict the values of the measured outputs throughout the full range of interest. Since only a reduced number of tests is needed, the overall computational time is strongly reduced. Subsequent application of genetic algorithms, provide the possibility of detailed exploration of established metamodels.In Centro Ricerche Fiat S.C.p.A. an effort of elaborating a novel optimization platform…
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Development of Double Sheet Hydroforming Technology

Centro Ricerche Fiat S.C.p.A.-R. Brun, A. Fuganti
M.A.C. S.p.A. (Magnetto Group)-R. Pasino
Published 2002-07-09 by SAE International in United States
This paper describes the research activities founded by the European Commission under the 5th Frame Work Programme, titled “Lighter and Safer Automotive 3D-Structures at Low Investments through the Development of the Innovative Double Sheets Hydroforming Technology”.As described into the project title, the objective is to develop and optimise double sheets hydroforming (DSH) in order to manufacture 3D automotive structures.A moch-up, representative of an automotive side frame, was designed both to evaluate the process limits and to validate the developed methodology for process numerical simulation.Design guidelines for application of this technology are the final output of the project.After a general overview description of the European project and its objectives, the following points will be described: mock-up design;process numerical simulation;experimental results.
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