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The Bogie suspensions ensure better stability at higher loads and also give the utmost reliability under extreme climatic conditions with minimum maintenance. Many vehicle manufactures have adopted for the bogie suspension at rear based on its advantages. The noises generated from the vehicle in the field includes engine noises and flow noises and hence it is very difficult to clearly discern the noise generated from suspension system of the vehicle [1]. Most suspension system noises do not come from a single part but they are caused by the coupling action between related parts, making it difficult to clearly identify the exact cases. This paper details the overall approach to identify the bogie suspension noise on a commercial vehicle and countermeasures to reduce the same.

Pass-By-Noise (PBN) requirements area an important aspect of NVH development of a commercial vehicle. The PBN on an Intermediate commercial vehicle (ICV) with refrigerator container was the subject of this study. This vehicle emitted PBN greater than accepted threshold due to its configuration. The overall approach to identify the sources and contributors for PBN was to test the vehicle in its baseline condition as well as with improvements. Near source noise measurements were performed at all potential noise contributors. A windowing technique was used to identify the potential noise sources. This Windowing technique is the exposing of each individual noise source while keeping all others shielded. This technique is reliable and quickly reveals significant noise contributors. Improvements to noise sources were reviewed for effectiveness to the overall PBN and overall recommendations were made.