Study on the Nonlinear Characteristics of a Rotating Flexible Blade with Dovetail Interface Feature

Li, Chaofeng; Shen, Zengchuang; Zhong, Bingfu; Wen, Bangchun

doi:10.1155/2018/4923898

Cited by 11 publications

(11 citation statements)

References 25 publications

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“…e vibration responses of the developed model and FE model in Ref. [8] are presented and compared to further validate the derived mode function. In this paper, the Rayleigh damping is adopted, as introduced in Section 2.…”

Section: Model Validationmentioning

confidence: 99%

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Nonlinear Vibration Analysis of a Rotating Disk-Beam System Subjected to Dry Friction

She

Tang

et al. 2020

Shock and Vibration

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In this work, a continuum model is proposed to simulate and interpret the coupling vibration characteristics of a rotating disk-beam system with the dovetail interfaces. The dovetail interface feature is represented by a macroslip dry friction model. The present study also derives a new mode function to simulate the vibration of a rotating beam with loosely assembled dovetail attachment. The new proposed mode function is validated by comparing the natural characteristics and vibration response with those obtained from a finite element (FE) model. At last, based on the nonlinear response results obtained by the Newmark-β method, the effects of different parameters on the nonlinear dynamics of the coupling system are discussed. The following interesting phenomena have been revealed: the flexible disk can impose different influences on the response characteristics of the rotating beam. The effects of dry friction on the beam’s energy dissipation are significant, especially at a low rotational speed. Further analysis yields that the excitation level and friction coefficient also exhibit a significant impact on the damping effect of dry friction. Consequently, it should be noted that the optimal values of the contact surface’s parameters allow achieving a better damping effect in the engineering practice.

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Section: Model Validationmentioning

confidence: 99%

“…Macroslip model and microslip model are two different kinds of friction mechanism model of friction damper. Macroslip model is extensively used firstly [6][7][8], which assumes that the contact DOF is in either slipping state or sticking state. en, a more realistic model is researched, which is microslip model [9,10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Vibration Analysis of a Rotating Disk-Beam System Subjected to Dry Friction

She

Tang

et al. 2020

Shock and Vibration

Self Cite

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“…Khaniki [20] concluded the disability of the nonlocal elastic theory differential form for presenting a reliable investigation on transverse vibrational behavior of rotating beams. Li et al [21] built their dynamic model based on the finite element method in order to analyze the nonlinear characteristics of a flexible blade contained in a centrifugal force field. Yao et al [22] investigated the varying-rotating-speed blade dynamic responses to the supersonic airflow and the cross-section warping effect.…”

Section: Introductionmentioning

confidence: 99%

Influence of Time Delay on Controlling the Non-Linear Oscillations of a Rotating Blade

Hamed

Kandil

2021

Symmetry

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Time delay is an obstacle in the way of actively controlling non-linear vibrations. In this paper, a rotating blade’s non-linear oscillations are reduced via a time-delayed non-linear saturation controller (NSC). This controller is excited by a positive displacement signal measured from the sensors on the blade, and its output is the suitable control force applied onto the actuators on the blade driving it to the desired minimum vibratory level. Based on the saturation phenomenon, the blade vibrations can be saturated at a specific level while the rest of the energy is transferred to the controller. This can be done by adjusting the controller natural frequency to be one half of the blade natural frequency. The whole behavior is governed by a system of first-order differential equations gained by the method of multiple scales. Different responses are included to show the influences of time delay on the closed-loop control process. Also, a good agreement can be noticed between the analytical curves and the numerically simulated ones.

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“…As nonlinear characteristics are induced, blades will present nonlinear vibration responses. Li et al [18] established dry friction model for dovetail tenons and studied the effects on vibration response of blades under various rotating speeds, friction coefficients, and external force amplitudes. It is found that, in certain conditions, vibration responses of tenons include harmonics not only with the same frequency as excitation force but its 3x and 5x components.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Features due to Breathing Crack from Vibration Response of Rotated Blades considering Tenon Connection and Shroud Contact

Yang

et al. 2019

Shock and Vibration

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Cracks are common failures of aeroengine rotated blades. Online monitoring of rotated blades through their vibration to identify cracks early in various working conditions is significant for operational safety. Breathing crack is a practical form of early cracks and results in nonlinear vibration response. Tenon connection and shroud contact are common structures in aeroengine rotated blades, which can also lead blades to vibrate nonlinearly and seriously interfere online identification of early cracks. us, it is important to extract vibration features due to breathing crack considering these two structures. Firstly, a blade with tenon and shroud is simplified and a lumped parameter model of the bladed disk is built. en, dry friction and coupling force on a blade are analyzed and dynamics equations of the lumped parameter model are established. Next, the stiffness of the blade trunk with a breathing crack is analyzed. Finally, the vibration response of blade trunks with the occurrence of breathing crack is analyzed in time and frequency domains by numerical simulation. Effective features due to breathing crack for online identification are extracted. 2x components of spectrums can be the criterion to judge whether breathing crack occurs. Besides, by comparing the changes in vibration amplitudes with 1x component peaks of spectrums, the cracked blade trunk can be distinguished. ese findings can provide important theoretical guidance for online identification of early cracks in aeroengine rotated blades.

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Study on the Nonlinear Characteristics of a Rotating Flexible Blade with Dovetail Interface Feature

Cited by 11 publications

References 25 publications

Nonlinear Vibration Analysis of a Rotating Disk-Beam System Subjected to Dry Friction

Nonlinear Vibration Analysis of a Rotating Disk-Beam System Subjected to Dry Friction

Influence of Time Delay on Controlling the Non-Linear Oscillations of a Rotating Blade

Extraction of Features due to Breathing Crack from Vibration Response of Rotated Blades considering Tenon Connection and Shroud Contact

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