Table 2 Collects the RMS values of rotational

Table 2. Collects the RMS values of rotational vibration response in filtered signal form Testing Time, hr No. Speed – Torque load, (rpm- Nm) Healthy 1 30. 30 2 30. 30 3 20 rpm – 20 Nm 30. 30 4 30. 30 5 30. 30 6 70. 300 7 70. 300 8 40 rpm – 40 Nm 70. 300 9 70. 300 10 70. 300 0. 0 1. 0 2. 0 3. 0 4. 0 5. 0 Planet gear crack - Filtered RMS value, rad/s 2 x 10 -3 45. 3 51. 7 57. 4 59. 2 61. 9 62. 3 2 -3 Planet gear spalling- Filtered RMS value, rad/s x 10 1208 1220 1228 1291 Planet gear breakage- Filtered RMS value, rad/s 2 x 10 -3 1335 2663 2973 Planet gears carrier crack- Filtered RMS value, rad/s 2 x 10 -3 34 38. 9 40. 1 44. 9 48. 3 65. 9 2 Main bearing inner race crack-Filtered RMS value, rad/s x 10 -3 39. 2 43. 4 62. 2 63. 2 65 67. 2 Planet gear crack - Filtered RMS value, rad/s 2 x 10 -3 80. 1 82. 3 102. 4 106 109. 2 110. 8 2 -3 Planet gear spalling- Filtered RMS value, rad/s x 10 2936. 1 3281 3386 Planet gear breakage- Filtered RMS value, rad/s 2 x 10 -3 4176 4255 4360 Planet gears carrier crack- Filtered RMS value, rad/s 2 x 10 -3 80 83 92 93 95 96 2 Main bearing inner race crack-Filtered RMS value, rad/s x 10 -3 81. 7 94. 3 127. 9 133. 9 136. 7 148 Shawki A. Abouel-seoud et al. Optimal Wind Turbine Planetary Gearbox Replacement Decision Using Vibration Monitoring and Hazard Model. World Journal Control Science and Engineering, 2013, Vol. 1, No. 1, 1 -8. doi: 10. 12691/wjcse-1 -1 -1 © The Author(s) 2013. Published by Science and Education Publishing. 6. 0 68. 5 67. 6 69. 1 127. 8 102 152. 5