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Investigation of non-contact bearing systems based on ultrasonic levitation / Su Zhao. 2010
Inhalt
1 Motivation
2 State of the art
2.1 Non-contact bearings
2.2 Ultrasonic levitation
2.2.1 Standing wave type
2.2.2 Squeeze film type
2.3 Non-contact bearings using squeeze film ultrasonic levitation
3 Research objective and thesis outline
3.1 Research objectives
3.2 Thesis outline
4 Basic theory on acoustics
4.1 Linear theory
4.1.1 Elastic waves in fluids
4.1.2 Equations of linear acoustics
4.1.3 Acoustic energy density and intensity
4.1.4 Atmosphere absorption of sound wave
4.2 Nonlinear theory - acoustic radiation pressure
5 Piezoelectric ultrasonic transducers
5.1 Piezoelectric actuator
5.1.1 Piezoelectric effect
5.1.2 Piezoelectric actuators
5.1.3 Lumped parameter model
5.2 Langevin type ultrasonic transducers
5.2.1 The half-wavelength-synthesis
5.2.2 Dimensioning method
5.2.3 Performance criteria
5.3 Driving method
5.3.1 Self oscillating circuit
5.3.2 Phase-locked-loop (PLL) controller
6 Standing wave ultrasonic levitation
6.1 A configuration for large planar objects
6.2 Modeling the proposed levitation system
6.2.1 Flexural vibration mode of the radiator
6.2.2 Sound beam in the acoustic near-field
6.2.3 Increased absorption due to nonlinear effects
6.2.4 Modeling the sound field
6.3 Simulation results
6.4 Conclusion
7 Suspension of large planar objects using ultrasonic standing waves
7.1 Experiments
7.1.1 Experimental setup
7.1.2 Levitation force measurement
7.1.3 Levitating a compact disc
7.1.4 Sound field visualization
7.2 Results and discussion
7.3 Conclusion
8 Squeeze film ultrasonic levitation
8.1 Modeling based on acoustic theory - acoustic radiation pressure
8.2 Modeling based on fluid mechanics - solving the Reynolds equation
8.2.1 Approximate solution of the Reynolds equation for large squeeze number
8.2.2 Solving the Reynolds equation numerically
8.3 Results and discussion
8.3.1 Experimental validation
8.3.2 Crucial parameters
9 An non-contact journal bearing based on squeeze film ultrasonic levitation
9.1 Design of the proposed bearing
9.1.1 The Langevin ultrasonic transducer
9.1.2 The spindle-bearing system
9.2 Testing the prototype bearing
9.3 Conclusion
10 Summary and outlook
Bibliography
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