Wyniki wyszukiwania - BazTech

1

State of the art on pedestrian safety simulation

Naddeo A., Annarumma M., Pappalardo M.

Journal of Achievements in Materials and Manufacturing Engineering

|

2008

|

Vol. 27, nr 1

67-70

EN

Purpose: The aim of this work is to explain the work of Design Methods' research group of Department of Mechanical Engineering of Salerno University, in the field of research regarding vehicles pedestrian safety problem, taking care to finite element methods and models used and developed for vehicle design and optimization. Design/methodology/approach: Our developed models show a very good Numeric/Experimental correlation, and we've numerically certified our virtual impactors, designed following EEVC-WG17 specification. These impactors have been tested also at higher speed and we have obtained a good correlation with some problems because of the critical behavior of the foam solved following different model-design optimization methods. Findings: Best results obtained and explained in this paper are concerning impactors modeling and certification, and Experimental/Numerical correlation of full impact tests. Research limitations/implications: The achievement of the maximum possible pedestrian safety performance, compatibly with the others, sometimes conflicting, performances, is one of the main objectives to reach, for the automotive industry by now and, above all, for the future. Practical implications: According to a surveying by European Community research committee, the risk of die for pedestrians and cyclists because of street incidents is eight/nine times higher than one of the occupants of motor vehicles. From statistics we've found that the greatest part of these accidents is due to the collision of the pedestrian on the front part of motor vehicles, and that fact affects the considerations on the passive safety. Originality/value: The most Important Automotive industries had understood the impact of new regulations about homologation and began to study the problem and particularly how to introduce new Homologation parameters in their Product development cycles, today based on Virtual Prototyping of the Whole Vehicle and final Physical testing of few physical prototypes.

2

State of the art of the passive pedestrian safety simulation

Naddeo A., Annarumma M., Pappalardo M., Cappetti N.

Journal of Achievements in Materials and Manufacturing Engineering

|

2008

|

Vol. 30, nr 1

51-58

EN

Purpose: In this paper we want to describe the work of Design Method's research group of Dept. of Mechanical Engineering of Salerno University, in the research sector concerning passive pedestrian safety for vehicles, taking into account models FEM used and developed for vehicle design and optimization. Design/methodology/approach: Our carried out models show a very good degree of Numeric/Experimental correlation, and also we've numerically certified our virtual impactors, designed following EEVC-WG17 requirements. These impactors have been tested at higher speed and we have had a good correlation, even if some difficulties there was, regarding the critical behaviour of the foam that covers some impactors, solved following different model-design optimization methods. Findings: Best results obtained and described in this paper are relating to impactors modelling and certification, and Experimental/Numerical correlation of crash tests. Research limitations/implications: The reaching of the elevated pedestrian safety performance, compatibly with the others, sometimes conflicting, performances, is one of the main targets to reach for the automotive industry by now and, above all, for the future. Practical implications: Statistic studies carried out during last decades have underlined as pedestrians-with a prevalence of children and elderly-are a category with great risk of die in car accidents, especially during the collision with the front part of motor vehicles, particularly in the urban areas: according to recent investigations of a research committee of the European Community (CEC 2001), the risk of death in case of accident is, for pedestrians and cyclists, equal respectively to 9 and 8 times vehicle occupants one. Originality/value: In such a context, this paper is intended to study the pedestrian injury at the impact with vehicles and methods of designing and constructing vehicles in order to reduce the damage itself.

3

Software independence: impact on automotive product development process

Annarumma M., Naddeo A., Pappalardo M.

Journal of Achievements in Materials and Manufacturing Engineering

|

2008

|

Vol. 31, nr 2

725-731

EN

Purpose: Currently, in automotive industries one of the most important works in product design is the evaluation of crash events using FEM simulation; in this context, software independence, that means to obtain the same simulation results on the same vehicle-model using different FEM solvers, will be useful for reducing virtual prototyping time and consequently Time To Market. Design/methodology/approach: The carrying out of a software-independence translation methodology is the aim of this work, which is an input data translation by a methodology independent of the CAE calculation environment and allows reducing significantly the product development time. This methodology will be developed by routines written ad hoc in Matlab language, that carries back in LS-DYNA environment the cards written in RADIOSS environment, supported by TextPad editor and completed by pre-processor Hypermesh. Findings: The translation could be made using the pre and post-processor Hypermesh and the RADIOSS model card manual correction, but this way working increases greatly the Time To Market, although today it is the only procedure used in the most important Italian automotive industries. Research limitations/implications: Most of crash simulation models are carried out in RADIOSS environment, but the LS-DYNA environment potentialities exploration has increased the simulations demand using LSDYNA software; therefore the development of a translation methodology like that satisfies this requirement. Practical implications: Software independence in Virtual Prototyping could accelerate several processes, bringing many benefits such as the reduction in product development time and in real prototyping costs and the increase in quality, carrying out more competitive product on the market. Originality/value: The carrying out of a translation methodology, that allows to carry back in a software environment the Know How developed for another software environment, will provide considerable industrial advantages for vehicle designers (We've to remind that often many design tasks of a project are made in outsourcing way).

4

Software independence: impact on product development plan in automotive industries

Annarumma M., Naddeo A., Pappalardo M.

Journal of Achievements in Materials and Manufacturing Engineering

|

2006

|

Vol. 18, nr 1-2

431--434

EN

Purpose: Purpose of this paper: Actually, in automotive industries one of the most important activities in product design is the evaluation of various events (i.e. crash events) using FEM simulation; in this context, software independence, that means to obtain the same simulation results on the same car-model using different FEM solvers, will be useful for reducing virtual prototyping time and consequently Time To Market. Design/methodology/approach: Development of a software-indipendence translation method is the aim of this work, which is an input data translation by a methodology independent of the FE calculation environment and allows reducing drastically the product development time. This methodology will be developed writing ad hoc a routine in Matlab language, that carries back in LS-DYNA environment the cards written in RADIOSS environment, helped by TextPad editor and completed by pre-processor Hypermesh. Findings: The translation could be executed using the pre and post-processor Hypermesh and the RADIOSS model card manual correction, but this way to operate increases greatly the Time To Market, although today is the only method used in the most important Italian automotive industry. Research limitations/implications: A Software independence in Virtual Prototyping could help to accelerate several processes. The need to reduce costs and to increase quality is nearly obvious. Practical implications: Most of crash simulation models are developed in RADIOSS environment, but the LS-DYNA environment potentialities exploration has increased the simulations demand using LS-DYNA software; therefore the development of a translation method like that meets this requirement. Originality/value: For product designers, the development of a translation methodology, that allows to carry back in a software environment the Know How developed for another software environment, will be very useful (We’ve to remind that often many design tasks of a project are made in outsourcing way).