螺旋桨原理问题

船小二 · 发表于 2011-1-30 10:23

2.6 The maximum permissible contact surface pressure at 0℃
   N/mm2  [ see 4-3-3/1.15.2(c)]
   =245 N/mm2  (See 1.18)
   =1.994(See 2.1)
   = 73.35 N/mm2

船小二 · 发表于 2011-1-30 10:24

2.7 Corresponding maximum permissible pull-up length at 0℃
   mm  [ see 4-3-3/1.15.2(c)]
   = 6.132 mm  (See 2.5)
   = 73.35  N/mm2  (See 2.6)
   =44.35 N/mm2  (See 2.4)
   =10.14 mm

船小二 · 发表于 2011-1-30 10:24

2.8 Minimum pull-up length at temperature t (t<35℃)
   mm  [ see 4-3-3/1.15.2(c)]
   =6.132 mm  (See 2.5)
   mm  (See 1.1)
   = 0.025  (See 1.10)
   = 17.5 10-6 mm/(mm•℃)  (See 1.13)
   = 12.0 10-6 mm/(mm•℃)  (See 1.12)

= 6.132+0.03725425
Temperature t ℃ 0 35

mm 7.436 6.132

船小二 · 发表于 2011-1-30 10:24

2.9 Corresponding minimum surface pressure at temperature t
   N/mm2  (Pt C, Ch1, Sec 8, 3.1.2)
   =44.35 N/mm2  (See 2.4)
   =6.132~7.436 mm  (See 2.8)
   =6.132 mm (See 2.5)

t = 0℃,  = 53.78 N/mm2
t = 35℃,  = 44.35 N/mm2

船小二 · 发表于 2011-1-30 10:24

2.10 Minimum push-up load at temperature t
   N
   =8.9 105 mm2  (See 2.4)
   =0.03  Pressure-in friction coefficient between contact surfaces for fitting methods
using oil injection (with radial oil pressure)
   =53.78 N/mm2 (t=0℃)  (See 2.9)
   =0.025  (See 1.10)
   =2.633×106 N

船小二 · 发表于 2011-1-30 10:25

3.0 Proposed pull-up length

Temperature ℃ 0 5 10 15 20 25 30 35
Proposed pull-up length mm 8.79 8.60 8.42 8.23 8.04 7.86 7.67 7.48

船小二 · 发表于 2011-1-30 10:27

4.0 Two hand operating hydraulic oil pump with 80 MPa pressure will be suitable
to fitting of the propeller.

Estimate:

1) Contact surface pressure 63.57~54.14MPa (35~0 ℃)

2) Push-up load 3.12~2.65×106 N (35~0 ℃)