笛卡(ka)兒坐標系(xi)(xi)(xi)(xi)分(fen)為左手(shou)(shou)(shou)系(xi)(xi)(xi)(xi)和右(you)(you)(you)手(shou)(shou)(shou)系(xi)(xi)(xi)(xi)。配管(guan)設計柔(rou)性分(fen)析采用(yong)右(you)(you)(you)手(shou)(shou)(shou)系(xi)(xi)(xi)(xi)，右(you)(you)(you)手(shou)(shou)(shou)坐標系(xi)(xi)(xi)(xi)這名詞是由右(you)(you)(you)手(shou)(shou)(shou)定(ding)則而來的。先(xian)將(jiang)右(you)(you)(you)手(shou)(shou)(shou)的手(shou)(shou)(shou)掌與(yu)手(shou)(shou)(shou)指伸直(zhi)，然后，將(jiang)中(zhong)(zhong)指豎起與(yu)食指呈直(zhi)角關(guan)系(xi)(xi)(xi)(xi)，再將(jiang)大(da)拇指往(wang)上指去，與(yu)中(zhong)(zhong)指、食指都呈直(zhi)角關(guan)系(xi)(xi)(xi)(xi)，則大(da)拇指、食指、與(yu)中(zhong)(zhong)指分(fen)別表示(shi)了(le)右(you)(you)(you)手(shou)(shou)(shou)坐標系(xi)(xi)(xi)(xi)的X軸，Y軸，與(yu)Z軸，如圖17.3所示(shi)。同樣(yang)，用(yong)左手(shou)(shou)(shou)也可以表示(shi)出(chu)左手(shou)(shou)(shou)系(xi)(xi)(xi)(xi)。