Modeling and Dynamic Analysis of Shrouded Turbine Blades in Aero-Engines

Nan, Guofang

doi:10.1061/(asce)as.1943-5525.0000510

Cited by 15 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Looking beyond energy harvesting, there are few reports that study three-degree-of-freedom vibro-impact systems where any two adjacent masses can come into impact. In the study of the impact among rotating shrouded blades [49][50][51], each blade is usually simplified as a cantilever beam with a tip mass (the shroud). Its impact with the adjacent shrouds is modelled using the impact between the tip mass and the two-sided weightless rigid bodies that are supported by springs.…”

Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Ouyang

Davis

2018

Nonlinear Dyn

View full text Add to dashboard Cite

A triboelectric energy harvester based on a three-degree-of-freedom vibro-impact oscillator is presented. Both the dynamic model of the oscillator and the theoretical model of the oscillator-based triboelectric energy harvester are established. The dynamic response and its effect on the electrical output are considered for various mass ratios and mass spacings. The study leads to the conclusions that the symmetric mass configurations of the oscillator are more beneficial to energy harvesting than the asymmetric cases. The extent of the initial spacing between the masses influences the dynamics of the system and the electrical output by triggering grazing bifurcation. High-order periodicity is found to accompany a reduction in the electrical power. An increase in mass ratio tends to increase the electrical output, and there may exist an optimal mass ratio at which the electrical output is maximized. Chatter and sticking motion can improve the output performance dramatically, while resonance, as usual, corresponds to large amplitude response, but these large amplitudes are not optimal for triboelectric energy harvesting, and thus the maximal output does not appear around resonance. This is different from other types of vibration-based energy harvesters, such as piezoelectric and magneto-

show abstract

Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Ouyang

Davis

2018

Nonlinear Dyn

View full text Add to dashboard Cite

show abstract

“…Batailly [6] adopted an explicit time integration method to deal with blade-casing interaction on the basis of the Lagrange multiplier method and Coulomb friction law. Nan [7] deduced a blade model according to the cantilever beam assumption and analyzed the effects of stiffness, mass and excitation force on impact vibration of the system. Sinha [8] derived the basic dynamical equations for a rotating radial cantilever blade, and analyzing the transient response of displacement vibration and rub-force load; Almeida [9] studied the influence of friction on the blade response by time-frequency graph to show the spectrum of a contact force that followed exactly Signorini's unilateral law with a single harmonic input; Ma [10] established a dynamic model of rotating shrouded blade considering the impact and analyzed the nonlinear and frequency characteristics of vibration and impact force, found that the impact force increased linearly with the increase of aerodynamic force amplitude.…”

Section: Introductionmentioning

confidence: 99%

Vibration investigation of rotor system with unbalance and blade-casing rubbing coupling faults

Ding¹,

Wang²,

Lu³

et al. 2020

J. vibroeng.

View full text Add to dashboard Cite

In order to investigate the mechanism of a rotor system with unbalance and blade-casing rubbing coupling faults, the vibration and rub force in a rotor system resulting from unbalance and blade-casing rubbing coupling faults are simulated. At first, a dynamic model of 0-2-1 form rotor is established, and a blade-casing model, which considered blade number, clearance between the blade tip and stator, stiffness and size of the blade, is introduced to the rotor model. The characteristics of unbalance and blade-casing rubbing coupling faults are analyzed by waterfall plot, spectrum, time domain chart of vibration and rub force, and the effects of speed and clearance between the blade tip and stator. Secondly, a rotor system tester is established according to the model structure. The experimental test of rubbing is simulated by adjusting the Feeding Device to control the clearance between the blade and stator. After simulation and experimental results were compared, it was found that fraction frequencies and high integer frequencies were affected by a blade-casing rubbing fault, the clearance and speed had different influence on the dynamic characteristic of rotor system with blade-casing rubbing fault.

show abstract

“…Chen 11 simulated four rubbing cases including the single-point rubbing, the multi-point rubbing, the local-part rubbing, and the cycle rubbing. Nan 12 deduced a blade model according to the cantilever beam assumption and analyzed the effects of the stiffness ratio, the mass ratio, and the amplitude of the excitation force on the rotor vibration. Wang et al.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of blade-casing rubbing faults with abradable coatings

Zhang

Lin

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

In this paper, a dynamic model of a “0-2-1” rotor system with rubbing fault between blade and abradable coated casings is developed. The sub-model of rubbing force considers scraping work energy of coating, casing stiffness, and initial clearance between blade tip and casing. A rotor rig is established and samples of abradable coatings are introduced into the rubbing experiment. Vibration characteristics of the rotor system under blade-casing rubbing fault are analyzed. Effects of rotating speed and initial clearance on the rub force and the system vibration are studied. Results show that the vibration of rotor focuses on the fundamental and multiple fundamental frequencies due to the blade-casing rubbing with the abradable coating. The multiple fundamental frequencies, the 2 × and 3 × in particular, are greatly affected by the rotating speed. The fractional harmonic frequencies are strongly influenced by the initial clearance between the blade tip and casing. Besides, the rotating speed and the initial clearance between the blade tip and abradable coating on the casing also affect the amplitude and distribution of the rub force.

show abstract

Modeling and Dynamic Analysis of Shrouded Turbine Blades in Aero-Engines

Cited by 15 publications

References 16 publications

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Vibration investigation of rotor system with unbalance and blade-casing rubbing coupling faults

Dynamic characteristics analysis of blade-casing rubbing faults with abradable coatings

Contact Info

Product

Resources

About