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GUIDELINES ON SHAFTING ALIGNMENT phần 8

Điều kiện tải trọng và đánh giá tính Kết quả Điều kiện Bia hơi nhẹ (Lạnh) trục tính toán liên kết đang được thực hiện giả định rằng con tàu là trong dự thảo điều kiện ánh sáng và các máy móc động cơ đẩy chính là trong điều kiện lạnh. Trong trường hợp các trục kết trước khi tung ra, việc tính toán liên kết trục được thực hiện cho điều kiện kết hợp thay vì cho dự thảo điều kiện ánh sáng . | ClassNK PART B AMENDMENT OF THE GUIDANCE TO THE RULES AND ITS EXPLANATORY NOTES 1.3 Load Condition and Evaluation of Calculation Results 1.3.1 Light Draught Condition Cold Condition -1 Shaft alignment calculations are to be performed assuming that the ship is in the light draught condition and the main propulsion machinery is in the cold condition. In cases where the shafts are coupled before launching the shaft alignment calculation is to be performed for the coupled condition instead of for the light draught condition without taking the buoy propeller into account. -2 When the aftmost stern tube bearing consists of oil-lubricated white met made of the nominal bearing pressure together with either the relative propeller shaft and aftmost stern tube bearing or the maximum stern tube bearing either of which is determined in order to p Each calculated value is to be within the allowable limit shown Table 1.3.1-2 Allowable Limits for Aftmost Stern T Allowable limit 1 Nominal bearing pressure 0.8 MPa aJflll Relative inclination between the propeller shaft and the aftmost stern tube bearing 3 X 10-4 rad o F t s Maximum bearing pressure pj k force on the to be n the s is ation is bearing Propeller sha jmum bearing pressure Bearing load negative calculated at any bearing is not to be more than the value tube bearing. ximum bearing e Figure 1.3.1-2 b . Pressure distribution Figure 1.3.1-2 b Maximum bearing pressure. at each bearing is to be a positive value. However for the diesel engine a bearing load of zero may be accepted t acceptable subject to the agreement of the engine manufacturer. The ing load is shown in Figure 1.3.1-4. Shaft I.I. T I I I Shaft Bearing load positive Figure 1.3.1-4 Direction of bearing load. 3 ClassNK PART B AMENDMENT OF THE GUIDANCE TO THE RULES AND ITS EXPLANATORY NOTES 1.3.2 -1 Light Draught Condition Hot Condition Shaft alignment calculations are to be performed assuming that the ship is in the light draught condition and the main propulsion