Acoustic VS Reliability. Case Study of Automotive Components Undergoing Vibration Endurance Tests Valeo Thermal Systems

Format:

Book

Conference/Event

Author/Creator:

Bonato, Marco, author.

Contributor:

Bennouna, Saad

Ravineala, Tudor

Conference Name:

13th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference (2024-06-19 : Graz, Austria)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2024

Summary:

During design development phases, automotive components undergo a strict validation process aiming to demonstrate requested levels of performance and durability. In some cases, specific developments encounter a major blocking point : decoupling systems responsible for optimal acoustic comfort performances.On the one hand, damping rubbers need to be soft to comply with noise, vibration and harshness criteria. However, softness would provoke such high amplitudes during vibration endurance tests that components would suffer from failures. On the other hand, stiffer rubbers, designed for durability purposes, would fail to meet noise compliance. The rubber design development goes through a double-faced dilemma : design with acceptable trade-off between NVH and durability, and efficient ways to develop compliant designs.This paper illustrates two case studies where different methodologies are applied to validate decoupling systems from both acoustic and reliability perspectives. The goal was to develop a strategy allowing quick and effective criteria of estimating damage.The first case study describes a new methodology, based on vibration measurements, reliability prediction and the simultaneous acoustic feedback, that helped establish an iterative design optimization of engine cooling module dampers. The main criterion is the consideration that the local damage at the failure zone can be derived from the absolute displacement of the item under test.The second case involved air conditioning system blowers. Based on physics-of-failure criteria, we demonstrate that vibration endurance tests requested by carmakers are not representative of real environments and resulting test failures are not realistic. A more representative profile is then proposed for durability tests

Notes:

Vendor supplied data

Publisher Number:

2024-01-2948

Access Restriction:

Restricted for use by site license