本文之目的在探討行駛中機車把手傳遞之局部振動量，期以建立有關機車之振動危害觀念，並提供車輛檢驗單位對逾齡機車淘汰評估之參考。本研究以國內機車廠牌依排氣量和使用程度不同篩選69輛機車，分別於三條公路以時速40及60公里/小時行駛4次進行測試。測試結果與ISO建議之振動暴露限值比較，行駛中機車之共振頻率約在100及200 Hz附近，其中重型有段排擋之新車最大振動量120-130 dB出現於80-160 Hz中央頻率處;同型舊車最大振動量高達134 dB，均已超過振動暴露限值，對長期連續暴露於機車振動者如郵差、送貨員等將引起局部振動危害。本文並對機車車速、車齡與振動之相關性進行分析比較。 The object of this investigation is to assess hand-um vibration levels of motorcycle handle bars in riding, in order to establish the concept about motorcycle vibration hazard, and contribute a reference for the judgement of overaging motorcycle to be eliminated for vehicular inspecting government agency. We selected 69 motorcycles manufactured in our country accordin8 to their exhaust quantities and riding status, and 4 times riding tests on three different highways at the speed of 40 and 60 km/hr. We got vibration level of three directions of the left handle bar by usin8 vibration analysis. The values checked by computer data analysis, were compared to the exposure limit of ISO suggestions. From ous research, we get certain results that proceeding motorcycle have resonant frequency around 100 and 200 Hz, the maximal acceleration of large-sized new motorcycle with sectionally variable shifts is 100-110 dB appeared in 80-160 Hz central frequency, the same type old motorcycle is 134 dB. The vibration on both types is higher than the exposure limit in ISO suggestions, received and taken by the hand-arm system. Therefore, some workers such as mailmen, deliverymen etc. have long term periodic exposure to the vibration as a result of that they are easy to get the vibration syndrome. In addition to the above statement, we compare the relation between velocity and vibration, also riding status and vibration of motorcycles at the same time.
