Intégration NVH des véhicules

Les projets comprennent les analyses comparatives subjective et objective, la définition des critères de performance des véhicules et du système/composant, la résolution de problème et le développement NVH pour atteindre les objectifs du programme et le soutien au lancement.

Garantir les performances acoustiques et vibratoires d'un véhicule est un défi de taille et nécessite un haut niveau d’expertise des caractéristiques NVH (bruit, vibration). Pour obtenir une réponse rapide et efficace, les OEM de automobiles privilégient parfois l’externalisation de l'intégration NVH des véhicules. De nombreux clients nous ont confiés l’entière responsabilité de la gestion des aspects du vibro-acoustique de leur programme automobile et nous sommes intervenu comme laboratoire du bruit et des vibrations. La gestion des projets incluait les analyses comparatives subjective et objective, la définition des critères de performance des véhicules et du système/composant, la résolution de problème et le développement NVH pour atteindre les objectifs du programme et le soutien au lancement

Nos activités :

Activités d'analyse comparative pour faciliter la définition des critères de performance des véhicules, ainsi que la cascade d'objectifs aux systèmes et composants.
Performances NVH des moteurs (développement acoustique et structurel, montage, modes de corps rigides, couplage modal, collecteur d'admission/échappement, etc.)
Gestion du bruit de passage (résolution de problème structurels/acoustique et développement de contre-mesures)
Gestion du bruit aérien (identification des sources de bruit, études des chemins de propagation, optimisation acoustique et développement de contre-mesures)
Optimisation acoustique pour répondre aux objectifs du programme, en se basant sur des méthodes conventionnelles et des techniques avancées d'imagerie acoustique – afin de réduire le temps d'évaluation.
Évaluations en mode dynamique de la structure de carrosserie par rapport aux objectifs du programme- afin de simplifier la résolution de problème et l’identification des zones potentiellement préoccupantes, pour le bruit de moteur, de passage, etc.
Accompagnement jusqu'au lancement, incluant les évaluations de conduite et événements presse

Voici quelques études et éléments de projets sur lesquels nous avons travaillé en collaboration avec nos clients :

Experimental testing for and finite element analysis (FEA) correlation of acoustic cavity and trim

A software and services company working with an automotive OEM requested that we assess (experimentally) all the cabin acoustic cavity modes in a vehicle, up to 150 Hz, to achieve better correlation between test and Computer-aided engineering (CAE) analysis.

Experimental Testing for FEA Correlation of Acoustic Cavity and Trim

Stationary acoustic and vibration measurements were conducted in a hemi-anechoic chamber. Vehicle body panels were instrumented with accelerometers and several microphones were positioned in the cabin. For the acoustic artificial excitation tests, a low-frequency volume velocity source was placed behind the rear seats. For the structural artificial excitation tests, a rear wheel was removed and a shaker positioned to excite at a rear suspension attachment point. Measurements were made at customer-defined locations with different trim configurations, from fully trimmed to completely bare. Complete datasets of acoustic, structural and vibro-acoustic transfer functions (V/F, P/F, V/Q, P/Q) were taken for each trim configurations and provided to the CAE team for correlation.

Integration of an electric power train in a SUV

An automotive OEM needed help to integrate an electric power train into an existing vehicle architecture. The project included benchmarking activities within the electric vehicle market with targets that cascaded down to the component-level. Performance relative to these targets was tracked throughout the development cycle, central issues were identified, and countermeasures were developed, evaluated, and implemented in cooperation with the OEM’s NVH team. Key development activities included power train mount development, acoustic package optimization, road and wind noise treatments, and accessory NVH performance. Programme support continued through to post-launch with successful public reviews. Our staff was also responsible for management of all day-to-day and long-term NVH activities in support of the vehicle development, being on-site at the OEM for over two years.

Vehicle NVH program support

An electric vehicle automaker needed NVH programme support for a vehicle programme from conception through the development process and on to launch. Initial targets were established from vehicle benchmarking and assessed throughout the programme using defined standardized tests. We measured static and operational acoustic and vibration data in a hemi-anechoic chamber and on-road at the customer’s US facilities. Multiple techniques, such as source path contribution, array-based and multi-coherence measurements and analysis, as well as troubleshooting, were used throughout the development process. Our engineers functioned as the customer’s NVH group throughout the project, from early target setting through to vehicle launch.