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1. WO2020115386 - PREDICTION OF SQUEAL INSTABILITY FOR A VEHICLE BRAKE

Publication Number WO/2020/115386
Publication Date 11.06.2020
International Application No. PCT/FR2019/052753
International Filing Date 19.11.2019
IPC
G06F 30/17 2020.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
30Computer-aided design
10Geometric CAD
17Mechanical parametric or variational design
B60T 8/88 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
8Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
32responsive to a speed condition, e.g. acceleration or deceleration
88with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
G01H 13/00 2006.01
GPHYSICS
01MEASURING; TESTING
HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
13Measuring resonant frequency
G06F 30/20 2020.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
30Computer-aided design
20Design optimisation, verification or simulation
CPC
B60T 8/885
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL
8Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
32responsive to a speed condition, e.g. acceleration or deceleration
88with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
885using electrical circuitry
G01H 13/00
GPHYSICS
01MEASURING; TESTING
HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
13Measuring resonant frequency
G06F 30/17
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
30Computer-aided design [CAD]
10Geometric CAD
17Mechanical parametric or variational design
G06F 30/20
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
30Computer-aided design [CAD]
20Design optimisation, verification or simulation
Applicants
  • PSA AUTOMOBILES SA [FR]/[FR]
  • CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE [FR]/[FR]
  • ECOLE CENTRALE DE LYON [FR]/[FR]
  • ECOLE NATIONALE D'INGENIEURS DE SAINT-ETIENNE [FR]/[FR]
  • ECOLE NATIONALE DES TRAVAUX PUBLICS DE L'ETAT [FR]/[FR]
Inventors
  • DENIMAL, Enora
  • NACIVET, Samuel
  • SINOU, Jean-Jacques
Agents
  • BOURGUIGNON, Eric
Priority Data
187222203.12.2018FR
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) PREDICTION OF SQUEAL INSTABILITY FOR A VEHICLE BRAKE
(FR) PRÉDICTION D'INSTABILITÉ DE CRISSEMENT POUR UN FREIN DE VÉHICULE
Abstract
(EN)
The subject of the present invention is a method for predicting squeal instabilities for a friction surface of a brake system, the method being implemented by computer and comprising: identifying (500) N unstable modes around a static equilibrium point, the unstable modes being defined respectively by N frequencies and N initial eigenvalues of N modes of the brake system; modeling (500) the brake system with a linear model in which non-linear forces are linearized with respect to displacement and speed in the degrees of freedom of the brake system; simulating (510) an excitation of the brake system by imposing a movement in said degrees of freedom, the imposed movement taking the form of a linear combination of N modal deformations, a modal deformation corresponding to an unstable mode and being defined by a variable-level modal amplitude and one frequency among the N frequencies; computing (520-570) a variation in at least one complex eigenvalue of at least one state matrix of the linear model when the level of a modal amplitude of at least one modal deformation varies.
(FR)
La présente invention a pour objet un procédé de prédiction d'instabilités de crissement d'une surface de friction d'un système de frein, le procédé étant mis en œuvre par ordinateur et comprenant : une identification (500) de N modes instables autour d'un point d'équilibre statique, les modes instables étant définis respectivement par N fréquences et N valeurs propres initiales de N modes du système de frein; une modélisation (500) du système de frein par un modèle linéaire dans lequel les efforts non-linéaires sont linéarisés vis-à-vis du déplacement et de la vitesse selon des degrés de liberté du système du frein; une simulation (510) d'une excitation du système de frein en imposant un déplacement selon lesdits degrés de liberté, le déplacement imposé étant sous forme de combinaison linéaire de N déformées modales, une déformée modale correspondant à un mode instable et étant définie par une amplitude modale de niveau variable et une fréquence parmi les N fréquences; un calcul (520-570) d'une évolution d'au moins une valeur propre complexe d'au moins une matrice d'état du modèle linéaire lorsque le niveau d'une amplitude modale d'au moins une déformée modale varie.
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