ﺗﺄﺛﯿﺮ ﻧﺎﻫﻤﺴﺎﻧﯽ ﺗﺎﯾﺮ ﺑﺮ ﻣﯿﺰان ﻫﺪررﻓﺖ ﺗﻮان ﺗﻮﻟﯿﺪي ﻣﻮﺗﻮر

The Effect of Tire Non-Uniformity on Engine Power Loss

در ﺣﺎﻟﺖ اﯾﺪه آل ﺑﺎﯾﺪ ﺗﺎﯾﺮ از ﻧﻈﺮ اﺑﻌﺎد ﻫﻨﺪﺳﯽ، ﺿﺮﯾﺐ ﻓﻨﺮﯾﺖ )ﺳﺨﺘﯽ( و ﺗﻮزﯾﻊ ﺟﺮم، ﮐﺎﻣﻼً ﻫﻤﺴﺎن ﺑﺎﺷﺪ. در اﯾﻦ ﺷﺮاﯾﻂ، ﻫﻨﮕﺎم ﺣﺮﮐﺖ ﺧﻮدرو ، ﺗﺎﯾﺮ ﺑﺪون اﻋﻤﺎل ﻫﯿﭻﮔﻮﻧﻪ ﻧﯿﺮو و ارﺗﻌﺎﺷﺎت اﺿﺎﻓﻪ و ﻣﻀﺮ ﺑﻪ ﺣﺮﮐﺖ دوراﻧﯽ ﺧﻮد اداﻣﻪ ﺧﻮاﻫﺪ داد اﻣ ﺎ ﻓﺮﺿﯿﻪ ﺣﺎﻟﺖ اﯾﺪه آل ﻓﻘﻂ در ﺷﺮاﯾﻂ ﺗﺌﻮري اﻣﮑﺎنﭘﺬﯾﺮ اﺳﺖ و ﻫﯿﭻ ﮔﺎه در ﻋﻤﻞ ﻗﺎﺑﻞ دﺳﺘﯿﺎﺑﯽ ﻧﺨﻮاﻫﺪ ﺑﻮد؛ ﺑﻨﺎﺑﺮاﯾﻦ در ﻋﻤﻞ، ﺗﺎﯾﺮ ﻫﻤﻮاره داراي ﻣﻘﺪاري از اﻧﻮاع ﻧﺎﻫﻤﺴﺎﻧﯽ ﻫ ﺎي ﻣﺨﺘﻠﻒ ﻣﯽ ﺑﺎﺷﺪ. اﯾﻦ ﭘﮋوﻫﺶ ﺑﻪ ﺑﺮرﺳﯽ ﻫﺪررﻓﺖ اﻧﺮژي ﯾﮏ ﺗﺎﯾﺮ ﻧﺎﻫﻤﺴﺎن ﻣﯽ ﭘﺮدازد. ﺑﺮاي اﯾﻦ ﻣﻨﻈﻮر، اﺑﺘﺪا ﺑﺎ اﺳﺘﻔﺎده از روشﻫﺎي ﺗﺤﻠﯿﻠﯽ، ﻣﯿﺰان ﻧﯿﺮوﻫﺎي ﻋﻤﻮدي ﺧﺎﻟﺺ اﻋﻤﺎلﺷﺪه ﺑﻪ ﭼﺮخ ﮐﻪ ﻧﺎﺷﯽ از ﻧﺎﻫﻤﺴﺎﻧﯽ و ﺑﺎرﮔﺬاري اوﻟﯿﻪ ﻣﯽﺑﺎﺷﺪ، اﺳﺘﺨﺮاج ﮔﺮدﯾﺪ. ﺳﭙﺲ ﻣﺪلﺳﺎزي ﻣﻮردﻧﻈﺮ در ﻧﺮماﻓﺰار ﻣﺘﻠﺐ ﺻﻮرت ﭘﺬﯾﺮﻓﺖ. ﭘﺲ از آن، ﻧﯿﺮوي اﺻﻄﮑﺎك ﺑﯿﻦ ﺗﺎﯾﺮ و زﻣﯿﻦ ﻣﺤﺎﺳﺒﻪ ﺷﺪ و ﺑﺎ ﻧﯿﺮوي ﻣﺤﺮك ﻣﻮﺗﻮر ﻣﻘﺎﯾﺴﻪ ﺷﺪ ﺗﺎ ﻣﯿﺰان ﻫﺪررﻓﺖ اﻧﺮژي ﺑﯿﻦ ﺗﺎﯾﺮ و زﻣﯿﻦ اﺳﺘﺨﺮاج ﮔﺮدد. در ﻧﻬﺎﯾﺖ ﻣﯿﺰان ﺗﻮان ﺗﻠﻒﺷﺪه ﺑﻪ دﻟﯿﻞ وﺟﻮد ﻧﺎﻫﻤﺴﺎﻧﯽ ﺗﺎﯾﺮ ﺑﺮرﺳﯽ و ارزﯾﺎﺑﯽ ﺷﺪ.

An ideal tire should be completely uniform in geometric dimension, mass distribution and stiffness coefficient. Under such conditions, the tire would rotate without any unwanted and harmful vibrations and/or force alterations delivered to the vehicle body as it moves. However, the ideal conditions are only theoretically possible and cannot be the case in actual conditions. Accordingly, a tire has some non-uniformities in actual conditions. This paper aims to study the lost energy of a non-uniform tire of a passenger car. To achieve this, the vertical force on the tire, which is due to initial loading and also each case of non-uniformity, was analytically calculated. Then, the equations were simulated in MATLAB software package. This was followed by comparing the frictional force between the tire and ground to the engine force to calculate the power loss. Finally, the value of power loss as a result of all kinds of tire non-uniformity was evaluated.