GUIDELINES ON SHAFTING ALIGNMENT phần 6

gián đoạn trong dốc của đường cong lệch Tổng số trên toàn bộ chiều dài của sự châm biến hình 10,4 dòng là một cái nhìn cận cảnh của sự lệch của phần động cơ phía sau của cơ cấu thu được từ mô hình thể hiện trong hình. . Như có thể nhìn thấy từ kết quả, trong khi các đường cong lệch trên cùng của đáy đôi bên dưới dòng sự châm biến khá trơn tru | ClassNK PART A GUIDELINES ON SHAFTING ALIGNMENT TAKING INTO ACCOUNT VARIATION IN BEARING OFFSETS WHILE IN SERVICE g g. B g model ble bottom d where the nd the supporting 12000 6000 foremost main bearing mm howing discontinuity between slopes of deflection curves of ain bearing centers. 10000 8000 effects on bean. actions. Fig. shows two sets of bearing heights that differ from each other only in the Fig. FE model integrated main engine structure with h displacement at each bearing support point. Discontinuity in Slope of Total Deflection Curve over Figure is a close-up view of the deflection of the aft shown in Fig. . As can be seen from the result beneath the shafting line is quite smooth there deflection curve consists of the point on the t points of the engine bearing in the engine p Center Line Bearing Line slope of the total deflection curve over the entire shafting line could cause adverse presence of a slope continuity at the longitudinal boundary between the hull and engine structures. While the deflection in the engine portion of the curve in red smoothly joins the deflection in the shaft portion of the curve the slope of the curve representing the engine portion of the deflection in blue is discontinuous at the longitudinal boundary between the hull and engine structures. The bearing reaction forces are calculated for the two sets of bearing offsets and are shown in Fig. . The shafting model used in this calculation is the same as that used in previous chapters. 46 ClassNK PART A GUIDELINES ON SHAFTING ALIGNMENT TAKING INTO ACCOUNT VARIATION IN BEARING OFFSETS WHILE IN SERVICE Original offset mm Smooth hull deflection mm Final breaking offset Final smooth offset Straight engine -----Quadratic po1 5000 10000 15000 Bearing location distance fro Fig. Two sets of bearing heights that di m continuity at the longitudinal boundary between t Bearing reaction fo -200000 -150000 ng .