Engineering & Materials Science
Drill strings
100%
Stick-slip
50%
Drilling
31%
Pendulums
31%
Rocks
20%
Controllers
19%
Feedback control
17%
Sliding mode control
15%
Drilling rigs
14%
Buckling
14%
Actuators
13%
Pneumatic actuators
12%
Mathematical models
11%
Rotors
10%
Orbits
9%
Drill pipe
9%
Experiments
9%
String theory
8%
Switches
8%
Chaos theory
8%
Stators
8%
Finite element method
7%
Time delay
7%
Feedback
7%
Angular velocity
6%
Reefs
6%
Solenoid valves
6%
Friction
6%
Bifurcation (mathematics)
5%
Elastic deformation
5%
Horizontal wells
5%
Mathematics
Strings
19%
Vibration
14%
Drilling
14%
Stick-slip
13%
Sliding Mode Control
13%
Numerical Study
13%
Experimental Study
9%
Chattering
9%
Experimental Results
9%
Horizontal Well
8%
Control Strategy
7%
Nonlinear Dynamics
7%
Energy Saving
7%
Dynamic Load
7%
Controller
7%
Excitation
7%
Delayed Feedback
6%
Elastic Deformation
6%
Friction
6%
Oscillation
6%
Actuator
5%
Nonlinear Control
5%
Pump
5%
Stress Field
5%
Substrate
5%
Chaos
5%
Lateral
5%
Model
5%
Physics & Astronomy
strings
23%
drilling
14%
slip
13%
pendulums
13%
controllers
12%
drill bits
11%
vibration
11%
clearances
10%
feedback control
10%
sliding
10%
rotors
9%
actuators
8%
torsional vibration
7%
oscillators
6%
rocks
6%
oscillations
6%
blades
6%
actuation
5%