Sommerfeld effect in a gyroscopic overhung rotor-disk system

Bisoi, Alfa; Samantaray, Arun Kumar; Bhattacharyya, Ranjan

doi:10.1007/s11071-017-3329-0

Cited by 25 publications

(14 citation statements)

References 26 publications

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“…The following assumptions were made for the damping fluid: (a) incompressible Newton fluid is used; (b) laminar flow thin film is used; (c) there is no slip at surfaces; and (d) there is no inertia effect or other external body forces. The oil film of the novel integral squeeze film bearing damper was analyzed, and the Reynolds equation was used for model analysis [21,22]:…”

Section: Theoretical Modeling Of Integral Squeeze Film Bearing Dampermentioning

confidence: 99%

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Vibration Control of an Unbalanced Single-Side Cantilevered Rotor System with a Novel Integral Squeeze Film Bearing Damper

Zhang

Yang

et al. 2019

Applied Sciences

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Featured Application: The proposed integral squeeze film bearing damper can effectively decrease the vibration of an unbalanced single-side cantilevered rotor system such as a flue gas turbine and pump. Abstract: In this paper, vibration control of an unbalanced single-side cantilevered rotor system using a novel integral squeeze film bearing damper in terms of stability, energy distribution, and vibration control is analyzed. A finite element model of such a system with an integral squeeze film bearing damper (ISFBD) is developed. The stability, energy distribution, and vibration control of the unbalanced single-side cantilevered rotor system are calculated and analyzed based on the finite element model. The stiffness of the integral squeeze film bearing damper is designed using theoretical calculation and finite element model (FEM) simulation. The influence of installation position and quantity of integral squeeze film bearing dampers on the vibration control of the unbalanced cantilevered rotor system is discussed. An experimental platform is developed to validate the vibration control effect. The results show that the installation position and quantity of the integral squeeze film bearing dampers have different effects on the stability, energy distribution, and vibration control of the unbalanced cantilevered rotor system. When ISFBDs are installed at both bearing housings, the vibration control is best, and the vibration components of the time and frequency domains have good vibration control effects in four working conditions. External excitations are mainly caused by the impact load and pulsation excitation of the fluid. When the excitation frequencies are close to the natural frequencies of the system, the resonance occurs in the system, causing unpredictable losses.With the rapid development of the single-side cantilevered rotor system, the vibration problems have become increasingly prominent. These problems pose a huge threat to safety production and economic benefits. In actual civil and military equipment, rotor systems often vibrate due to unbalance, resulting in impeller fracture, seal failure, bearing damage, valve failure, pipeline leakage, and loose foundation [6]. These faults cause equipment damage or even major safety accidents, along with unpredictable personal injury to users. So, it is necessary to control the vibration of the unbalanced single-side cantilevered rotor.The vibration mechanism of the unbalanced single-side cantilevered rotor system has already been researched by many scholars. According to the obtained theory, the vibration control of the system is divided into four types: structural modification, vibration absorption, vibration isolation, and vibration damping. At the same time, the vibration control method is divided into two types: active and passive control. Active control refers to the use of the sensor to collect signals and feedback for the controller to drive the damper to reduce vibration. Passive control refers to vibration control that can be performed without add...

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Section: Theoretical Modeling Of Integral Squeeze Film Bearing Dampermentioning

confidence: 99%

“…The oil film of the novel integral squeeze film bearing damper was analyzed, and the Reynolds equation was used for model analysis [21,22]:…”

Section: Theoretical Modeling Of Integral Squeeze Film Bearing Dampermentioning

confidence: 99%

Vibration Control of an Unbalanced Single-Side Cantilevered Rotor System with a Novel Integral Squeeze Film Bearing Damper

Zhang

Yang

et al. 2019

Applied Sciences

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“…The overhung rotor is controlled by four electromagnets, with the AMBS at one end. In addition, the displacements of the rotor from the equilibrium position are assumed to be very small [17]. The primary structure of a suitable type of AMBS is shown in Figure 1.…”

Section: Modelling Of An Overhung Active Magnetic Bearing Rotor Systemmentioning

confidence: 99%

Vibration Reduction of an Overhung Rotor Supported by an Active Magnetic Bearing Using a Decoupling Control System

Numanoy

Srisertpol

2019

Machines

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Overhung rotors are important for use in industrial turbo-machines. The effects of a lateral force can increase as a result of the rotor weight, misalignment, or the operating speed of the suspension system for which the rotor is carrying a transmission connection. In this paper, the reduction of vibration in supported lateral directions by varying control is discussed in a radial active magnetic bearing system (AMBS). An experimental test was conducted on the orbital response of an overhung rotor supported by an AMBS, to provide an alternative for improving precision. To simplify the system design, decoupling was achieved using a PID controller and harmonic disturbance compensator (HDC), which improved the rotating performance of an overhung active magnetic bearing (AMB) rotor system, using a frequency response function (FRF) approach and a description of the overhung rotor during normal operational conditions at unique frequencies. The experimental results show that the precision rotation, due to harmonic excitation of the shaft orbit, can be removed in real time using compensation signals using trigonometry. The compensation criteria for the changed run-up and coast-down consistently helped to maintain the rotational center in a central position. A reduction of up to 55% in vibration amplitude on average was achieved under appropriate conditions, and the significance of the overhung rotor symptoms faults were investigated.

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“…The calculation of the harvested power of the autoparametric absorber is given by Eqs. (17) and (18) that describe the dimension and dimensionless harvested power, respectively…”

Section: Engineering Problem and Mathematical Model Designmentioning

confidence: 99%

“…Therefore, near resonance, it appears that the additional power supplied to the motor only increases the amplitude of the response of the supporting structure while there is a little effect on the RPM of the motor. Eventually, enough power is supplied to the motor to initiate the jump, the operating frequency increases and the amplitude decreases, resulting in lower power consumption by the motor [10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

On vibration mitigation and energy harvesting of a non-ideal system with autoparametric vibration absorber system

et al. 2018

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This paper demonstrates that vibration mitigation and energy harvesting can be achieved simultaneously by using of an electricity-generating from autoparametric vibration absorber system (AVAS) and non-ideal system (NIS). The NIS consists of a simple portal frame excited by a small dc motor with eccentric mass, with limited power supply and located on the top. The AVAS consists of a cantilever beam with tip mass parallel coupled to NIS. A piezoelectric material is considered for energy harvesting installed in the base of the AVAS and an electric circuit is connected to the piezoelectric material in order to produce voltage output. Several numerical simulations were carried out focusing on the passage through the resonance of NIS, when the motor rotational frequency is near the portal frame natural frequency and when the non-ideal subsystem frequency is approximately twice the absorber beam frequency (two-to-one internal resonance). The results showed the existence of Sommerfeld effect in NIS and saturation phenomenon in the NIS-AVAS.

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Sommerfeld effect in a gyroscopic overhung rotor-disk system

Cited by 25 publications

References 26 publications

Vibration Control of an Unbalanced Single-Side Cantilevered Rotor System with a Novel Integral Squeeze Film Bearing Damper

Vibration Control of an Unbalanced Single-Side Cantilevered Rotor System with a Novel Integral Squeeze Film Bearing Damper

Vibration Reduction of an Overhung Rotor Supported by an Active Magnetic Bearing Using a Decoupling Control System

On vibration mitigation and energy harvesting of a non-ideal system with autoparametric vibration absorber system

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