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SECTION THREE - VIBRATION CAUSES
Vibration Causes Introduction p 118 Oil Whip p 156,157
Unbalance Vibration p 118-124 Mechanical Looseness Vibration p 157-160
Causes of Unbalance p 119-124 Electrical Problem Vibration p 160-167
Deposit and Build-Up p 119 Slip Frequency p 162
Corrosion and Wear p 119,120 Torque Pulsations p 162,163
Eccentricity p 120 Armature Problems p 163-165
Keys and Keyways p 120-122 Stator Problems p 165-167
Clearance Tolerance p 122 Belt Drive Vibration p 167-174
Distorsion p 122,123 Determining Belt Frequency p 169-170
Casting Imperfections p 123,124 Belt Tension p 170,171
Misalignment Vibration p 124-131 Belt Slippage p 171,172
Types of Misalignment p 124-130 Defective Belts p 172,173
Parallel Offset p 124,125 Balancing Belt Pulleys p 173,174
Angular p 124,125 Damaged Gear Vibration p 174-177
Parallel Offset & Angular p 124,125 Resonance Vibration p 178,179
Misalignment Sources p 131 Aerodynamic & Hydraulic Vibration p 179-195
Eccentric Forces Vibration p 131-135 Cavitation p 181-187
Bent Shaft Vibration p 135-137 Recirculation p 187-189
Resonant Whirl p 136,137 Discharge Recirculation p 189,190
Anti-Friction Bearing Vibration p 137-146 Suction Recirculation p 190,191
Frequency Analysis p 137,142 Flow Turbulence p 191-194
Bearing Loads p 142,143 Random Vibration p 195
Causes of Bearing Failure p 143-146 Reciprocating Forces Vibration p 195-198
Vibration from Journal Bearings p 146-157 Rubbing Vibration p 198,199
Excessive Bearing Clearance p 148,149 Rotor Flex Vibration p 199-201
Detecting Faulty Bearing p 149,150 Beat or Pulsation Vibration p 201-203
Oil Whirl p 150-156 Hydraulic System Vibration p 203-206