åé¥ç侧é¢å±å¼å¾ä¸ºæå½¢ã
æå½¢çåå¾ä¸ºåé¥çæ¯çº¿ï¼æå½¢ç弧é¿ä¸ºåé¥çåºé¢å¨é¿ã
é¢ç§¯å ¬å¼ï¼åé¥ä¾§é¢å±å¼å¾S侧=Ïrl=ï¼nÏl^2ï¼/360
以ç´è§ä¸è§å½¢çä¸æ¡ç´è§è¾¹æå¨ç´çº¿ä¸ºæ转轴ï¼å ¶ä½ä¸¤è¾¹æ转形æçé¢æå´æçæ转ä½å«ååé¥ã该ç´è§è¾¹å«åé¥çè½´ ã
ï¼1ï¼ä»¥ç´è§ä¸è§å½¢çä¸æ¡ç´è§è¾¹æå¨ç´çº¿ä¸ºæ转轴ï¼å ¶ä½ä¸¤è¾¹æ转形æçé¢æ
ï¼2ï¼åé¥ç±ä¸ä¸ªé¡¶ç¹ï¼ä¸ä¸ªä¾§é¢åä¸ä¸ªåºé¢ç»æï¼ä»é¡¶ç¹å°åºé¢åå¿çè·ç¦»æ¯åé¥çé«ã
(3)åé¥æ两个é¢ï¼åºé¢æ¯åå½¢ï¼ä¾§é¢æ¯æ²é¢ã
(4)让åé¥æ²¿æ¯çº¿å±å¼ï¼æ¯ä¸ä¸ªæå½¢ãåæ±çä½ç§¯çäºåå®çåºçé«çåé¥çä½ç§¯çä¸åæ¯å«åé¥å½¢ã
ï¼5ï¼åé¥çä½ç§¯å ¬å¼ï¼ä¸åä¹ä¸åºé¢ç§¯ä¹é«ï¼ç¨åæ¯è¡¨ç¤ºä¸º1/3Ïr²hã