A car horn is a safety device present on every type of vehicle as a warning system. In order to be mounted on a vehicle standard CEE-ECE N 70/388 gives the minimum performance requirements in terms of sound emission that car horns must guarantee outside the vehicle. At the same time the increase of noise treatments in engine compartment leads to necessity to have higher performances of car horns themselves. Starting from such motivation collaboration between the University of Ferrara, and the FIAMM S.p.A. group aimed to optimize and maximize the sound emission of its commercial car horns. In this paper two different numerical models are presented and discussed. The first numerical model simulates the crimped housing that generates the sound field in terms of its fundamental working frequency. The latter studies the complete system, that includes the crimped housing and the geometry of the spiral exponential horn shape (snail). Using an automatized procedure the geometry of the snail is modified according to an optimization scheme; the intent of the complete procedure is to have an increase of sound pressure emitted and a set of cavity modes well coupled with fundamental working frequency and its first harmonics. Several numerical models will be presented and validated against experimental tests.

Optimisation of a car horn using multiphysics analysis

MARESCOTTI, Cristina
Primo
;
BONFIGLIO, Paolo
Secondo
;
POMPOLI, Francesco;
2015

Abstract

A car horn is a safety device present on every type of vehicle as a warning system. In order to be mounted on a vehicle standard CEE-ECE N 70/388 gives the minimum performance requirements in terms of sound emission that car horns must guarantee outside the vehicle. At the same time the increase of noise treatments in engine compartment leads to necessity to have higher performances of car horns themselves. Starting from such motivation collaboration between the University of Ferrara, and the FIAMM S.p.A. group aimed to optimize and maximize the sound emission of its commercial car horns. In this paper two different numerical models are presented and discussed. The first numerical model simulates the crimped housing that generates the sound field in terms of its fundamental working frequency. The latter studies the complete system, that includes the crimped housing and the geometry of the spiral exponential horn shape (snail). Using an automatized procedure the geometry of the snail is modified according to an optimization scheme; the intent of the complete procedure is to have an increase of sound pressure emitted and a set of cavity modes well coupled with fundamental working frequency and its first harmonics. Several numerical models will be presented and validated against experimental tests.
2015
978-888894248-3
9781510809031
Car horn, acoustical optimisation, multyphiscs analysis
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2332078
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