笛卡兒坐標系分為左(zuo)手(shou)(shou)(shou)系和右(you)(you)(you)手(shou)(shou)(shou)系。配管(guan)設計柔性(xing)分析采用右(you)(you)(you)手(shou)(shou)(shou)系，右(you)(you)(you)手(shou)(shou)(shou)坐標系這名詞(ci)是由右(you)(you)(you)手(shou)(shou)(shou)定(ding)則(ze)而(er)來的(de)。先將右(you)(you)(you)手(shou)(shou)(shou)的(de)手(shou)(shou)(shou)掌與(yu)(yu)手(shou)(shou)(shou)指(zhi)(zhi)伸直(zhi)(zhi)，然后(hou)，將中(zhong)指(zhi)(zhi)豎起(qi)與(yu)(yu)食指(zhi)(zhi)呈直(zhi)(zhi)角關(guan)系，再(zai)將大拇(mu)指(zhi)(zhi)往上指(zhi)(zhi)去(qu)，與(yu)(yu)中(zhong)指(zhi)(zhi)、食指(zhi)(zhi)都呈直(zhi)(zhi)角關(guan)系，則(ze)大拇(mu)指(zhi)(zhi)、食指(zhi)(zhi)、與(yu)(yu)中(zhong)指(zhi)(zhi)分別(bie)表(biao)示(shi)了右(you)(you)(you)手(shou)(shou)(shou)坐標系的(de)X軸(zhou)，Y軸(zhou)，與(yu)(yu)Z軸(zhou)，如圖(tu)17.3所示(shi)。同樣，用左(zuo)手(shou)(shou)(shou)也(ye)可(ke)以表(biao)示(shi)出左(zuo)手(shou)(shou)(shou)系。