Theoretical and Experimental Studies on Squeeze Film Stabilizers for Flexible Rotor-Bearing Systems Using Newtonian and Viscoelastic Lubricants

Halder, B.; Mukherjee, A.; Karmakar, Ranit

doi:10.1115/1.2930131

Cited by 11 publications

(4 citation statements)

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“…Graw Hill, helped us to understand dynamics of physical system actuated with nonpotential fields it also gave us the mathematical insight of forces which are essentially non-potential in nature and how they affect the rotor dynamics and even addressed issues of the instability conditions in a hydrodynamic bearing system. One paper [9] "Theoretical and Experimental Studies on Squeeze Film Stabilizer for Flexible Rotor-Bearing Systems Using Newtonian and Viscoelastic Lubricants" Jr. of Vibration and Acoustics, Transaction of ASME, used squeeze film dampers essentially for large size rotor. Some state feedback control strategies for stabilization of extremely large size rotors was studied [14], [15] but most of the control techniques were using predominantly large number of states as feedback therefore increasing the number of sensors which adds to further complexity in the system.…”

Section: Literaturementioning

confidence: 99%

Numerical Simulation of a Small Size Rotor With Selfinduced Instability Using Sliding Mode and Fopid Controller and Their Comparison

2018

IJOMAM

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Dynamic systems like gyro-pendulums and tippe-tops behave in a peculiar unstable manner due to material or internal damping. Dynamic systems beyond certain critical threshold spinning speed may become unstable due to rotating dampers. There have been several efforts in the past to stabilize such systems but most of the earlier efforts to stabilize such rotors had difficulty in stabilizing extremely small size, mini or micro rotors although one may find some efforts to stabilize medium to large size rotors using some heavy actuators like squeeze film dampers etc. The underlying problems with the small size rotors is that if the selection of the actuators is not proper than the actuator size may be heavier than the rotor itself therefore the choice of actuators remains always a challenge in a rotor with micro or mini size. Since in the present work the control, sensing and actuation all are embedded within a single embedded coupling due to obvious practical reasons as discussed in the paper the challenge is to see the entire dynamics from a moving frame or rotating coordinate system. Design and practical implementation of these smart structures always remains a big challenge.

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Section: Literaturementioning

confidence: 99%

Numerical Simulation of a Small Size Rotor With Selfinduced Instability Using Sliding Mode and Fopid Controller and Their Comparison

2018

IJOMAM

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“…Grew Hill, helped us to understand dynamics of physical system excited with non-potential fields it also gave us the mathematical insight of forces which are essentially non-potential in nature and how they affect the rotor dynamics and even addressed issues of the instability conditions in an hydrodynamic bearing system. One paper [9] "Theoretical and Experimental Studies on Squeeze Film Stabilizer for Flexible Rotor-Bearing Systems Using Newtonian and Viscoelastic Lubricants" Jr. of Vibration and Acoustics, Transaction of ASME, used squeeze film dampers for large size rotor. Papers [7], [10] and [16] gave us an insight about the dynamics of piezo actuators and how it could be used as an actuating devise in a rotor model Book references [14] and [15] were used to understand the electrical and mechanical dynamics of the piezo-actuation system these references were also used to refer to the actuator parameters and its frequency responses.…”

Section: Brief Literature Reviewmentioning

confidence: 99%

A simple linear quadratic regulator (LQR) approach for active stabilization of mini rotors due to spinning dissipation

Mukherjee¹,

Das²

2018

AMA_C

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Destabilizing effects due to rotating damper's in a gyrating or spinning systems is a very common phenomenon. Rotor's at speed higher than certain threshold values become unstable due to rotating damping forces generated by dissipation in rotor materials, coupling or due to friction in spline's and tool tip's. Presently the current methods are mostly passive and suitable for large or medium size rotor's but not quite applicable for small, mini or micro rotor systems. This paper uses an alternative technique to stabilize rotors of any size and description. The authors propose a piezo electrical type of actuating system for applying damping force to the rotating shaft by implementing a smart embedded coupling which rotates along with the rotor. The stabilization control was implemented by designing a simple state feedback Linear Quadratic Regulator whose gains were determined and applied to the rotor shaft through proposed smart embedded coupling.

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“…Thereafter, each flexural mode was modeled by using Bond graphs and finally integrated into a single model. For modeling the system of flexible rotors with different modal components, the following papers [27][28][29][30][31] were referenced to build the complete model. Initially, the system was kept uncontrolled without any controller and instability was clearly visible through simulated results.…”

Section: Introductionmentioning

confidence: 99%

Whirl Orbital Response Control of Micro Rotors With Flexural Modes

Mukherjee¹,

Das²,

Sengupta³

2018

The International Journal of Acoustics and Vibration

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In this paper there is an attempt to develop an elegant controlling strategy to stabilize flexible rotors having flexural modes. Initially, the possible causes of instability in a rotor system due to internal damping through mathematical formulation are discussed. The threshold or the critical speed was derived beyond which the rotor became unstable. The stabilizing algorithm was designed by keeping the overall control law mathematically simple such that minimum numbers of sensors were used and deployed. Actuators were properly selected such that control and stabilization was practically possible for rotors of such low diameters. Bond graphs were used to model the rotor system having flexural modes. As bond graphs act as a portrayal of power and information exchange within the system and with external environment, bond graphs may give a better clue for modeling such systems. The real challenge in this work lies in the proposal of control strategy in stabilizing non-rigid rotors having flexible modes. Mathematical simplicity of the proposed control algorithms is considered for its easy deployment. The Simplest Beam model the Euler-Bernoulli beam is considered.

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Theoretical and Experimental Studies on Squeeze Film Stabilizers for Flexible Rotor-Bearing Systems Using Newtonian and Viscoelastic Lubricants

Cited by 11 publications

References 0 publications

Numerical Simulation of a Small Size Rotor With Selfinduced Instability Using Sliding Mode and Fopid Controller and Their Comparison

Numerical Simulation of a Small Size Rotor With Selfinduced Instability Using Sliding Mode and Fopid Controller and Their Comparison

A simple linear quadratic regulator (LQR) approach for active stabilization of mini rotors due to spinning dissipation

Whirl Orbital Response Control of Micro Rotors With Flexural Modes

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