June 2, 2010

*** ( 輪胎的大小將影响時速表的正確性 ). ***



輪胎為旋轉運動
,車輛為直線運動
,
二者的關係為
:
V=π
D
N
V:
表車輛速度.(單位公尺/分鐘
)
π:
圓周率
.(3.14159)
D:
輪胎直徑.(單位公尺
)
N:
輪胎轉速.(單位轉/分鐘
)

所以由上式中得知
:
當轉速相同時,輪胎大小D的改變,將影响結果車速
V.
但是因為儀表內的車速計轉速比並未相對應更改
,
仍以原輪胎直徑為換算比,所以實際上你的車速己經

超過60公里/小時,但車速計顯示或許只有55公里/小時.

:
原廠輪胎直徑為13=0.330公尺

改新輪胎直徑為14=0.355公尺
所以新舊輪胎車速比值為0.92957
也就是當實際車速達100公里/小時
,
你的車速表只顯示92.957公里/小時
.
實際速度比車速表快.

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