The problem of vibration and noise in public transport vehicles

The purpose of this paper is to formulate preliminary proposals for technical solutions aimed at reducing the vibrations and noise felt inside a bus vehicle. The analysis was based on a series of measurements taken in selected vehicles. Particular attention was paid to the identification of vibroacoustic excitations from the engine, an initial assessment of the acoustic and vibration state of bus interiors, and an analysis of noise propagation into the bus interior.The objects of the study were the A1012T and A0909L buses manufactured by. The problem related to the nuisance of noise and vibrations transmitted into the interior of means of transport, such as buses, has been signaled for years. It might only seem that the development of modern automotive technology has eliminated these inconveniences. The emphasis placed on the ecology of compression-ignition engines has forced bus manufacturers to use standardized power units in the vehicles produced. With this approach, no particular attention was paid to adapting the body structure to the engine series available on the market. This can lead to the problem of excessive noise and vibration felt by passengers.
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Radosław MARCZUK , Ryszard OLSZEWSKI
2. VIBRATION MEASUREMENT
Vibration acceleration measurements were carried out while the vehicle was stationary, with the engine idling at the following crankshaft speeds:
• 600 rpm, • 1200 rpm, • 2000 rpm.
Vibration acceleration measurements were performed according to the scheme presented in Figure 1.
The LabVIEW environment was used in the measurements, which allowed for the simultaneous measurement of signals in 16 channels (recording signals from five triaxial acceleration sensors). (…)

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