NOISE EMISSION CHARACTERIZATION OF DIFFERENT COMMERCIAL MOTORCYLES IN NIGERIA FOR APPROPRIATE MANAGEMENT STRATEGIES

Year 2023, Volume: 2 Issue: 1, 40 - 52, 31.07.2023

Adinife Azodo

Abstract

The costs and benefits of motorcycle noise reduction have received less attention in developing countries despite the adverse effects of inordinate exposure to noise. The first step in noise management is to gain an understanding of the types of noise generated in order to design an appropriate mechanism to reduce the noise. Therefore, this study characterized the noise emitted by different models of commercial motorcycles in Benue State, Nigeria. Five models of motorcycles - Motobi, Bajaj Boxer, CY90 Jianshe, Honda 110 and Jincheng, were studied. The noise level data were collected under two main operating conditions; idle (Zero and full throttles modes) and moving motorcycles at 30 km/h; 40 km/h or 50 km/h (with and without loads). The result showed that Jincheng motorcycles emitted the highest noise level with an average mean of 74.00 dB (A) (SD = 2.62) at zero throttle and 80.00 dB (A) (SD = 2.54) at full throttle. The paired samples T-tests between the zero throttle and the full throttle mode showed significantly higher noise emission level for full throttle operation when compared to zero throttle (p<.001). The used Jianshe and Jincheng motorcycle models emitted noise above the World Health Organization recommended standard limit of 70-75 dB for noise from motorcycles. While Jincheng motorcycle model with silencer and CY90 Jianshe and Jincheng motorcycle model without silencer emitted noise above 90 dB(A), which is the standard recommended by the US Environmental Protection Agency (FEPA). This study will help the relevant authorities to develop appropriate noise emission management strategies.

Keywords

noise emission, motorcycle models, idle mode, sound muffles, noise reduction

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