Vehicle Body Vibration and Noise Impact on Driver and Passengers Analysis: The Case of the 29-Seat Thaco Garden TB79s Bus
Received: 8 October 2024 | Revised: 5 November 2024 and 26 November 2024 | Accepted: 12 December 2024 | Online: 24 January 2025
Corresponding author: Vu Hai Quan
Abstract
Noise, Vibration, and Harshness (NVH) are critical factors influencing the comfort and satisfaction of vehicle occupants. NVH encompasses the sound levels generated during vehicle operation, the vibrations transmitted through the vehicle structure, and the perceived harshness of the ride quality. This study focuses on the NVH analysis of the Thaco Garden TB79S, a 29-seat passenger vehicle. The Finite Element Method (FEM) is applied to simulate the impact on the vehicle as it traverses two types of road surfaces, characteristic of Vietnam: rumble strips with varying frequencies and uneven roads with random excitation. The results reveal that the Sound Pressure Level (SPL) is within the frequency range from 0 to 200 Hz while the vehicle navigates on rumble strips. Further analysis of the vehicle's body and the air mass within the cabin identifies a resonance phenomenon at the driver's ear location at 176 Hz, resulting in a maximum SPL of 166.92 dB. Additionally, the study examines the noise formation within the cabin during a 25-second period as the vehicle travels over random road surfaces. The maximum sound pressure at the driver's position reaches 0.24 psi, with the SPL fluctuating primarily between 130 and 155 dB.
Keywords:
NVH, natural vibration, finite element methodDownloads
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