Identification of nonlinear model for rotary high aspect ratio flexible blade using free vibration response

Mahariq, İbrahim; Kavyanpoor, Mobin; Ghalandari, Mohammad; Nazari, Mohammad Alhuyi; Bui, Dieu Tien

doi:10.1016/j.aej.2020.01.029

Cited by 15 publications

(4 citation statements)

References 26 publications

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“…Ref. [28] proposes a new identification approach based on nonlinear free vibration decay. The nonlinear free response of the system was determined by the coupling of generalized variation iteration and the modified differential transformation methods.…”

Section: Introductionmentioning

confidence: 99%

Vibration Parameters Identification of Rotating Blades Based on Blade Tip-Timing Sensor Waveforms

Zhang

Wang

2023

Applied Sciences

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Blade tip-timing is one of the most widely used non-contact measurement methods for rotating blade vibration. The classic blade tip-timing method is to identify the vibration parameters of the blade based on the time of blade tip arrival to the tip-timing sensor installed on the casing. Since the vibration measurement of blade tip-timing is a serious under-sampling method, the blade resonance frequency is usually higher than the sampling frequency of the BTT data acquisition system, resulting in a large identification error of blade vibration parameters. In view of the above shortcomings, a blade vibration parameters identification method is proposed based on the mapping matching between the static waveform of the sensor and the dynamic waveform of the blade tip-timing. The modulation effects of different vibration displacements, velocities and vibration amplitudes on the tip-timing waveform of the sensor are analyzed. The vibration displacements and velocities of the blade tip passing through the sensor are obtained by the waveform mapping method, and then the vibration parameters of the blade are identified. The influence of the number of blade tip-timing sensors on the identification accuracy of the blade vibration parameters identification algorithm is observed based on the waveform mapping theory. The identification accuracy of waveform mapping method is compared with other methods. The results show that compared with the under-sampled time of arrival (TOA) data of classic BTT applications, the modulation of the sensor waveform output by blade vibration can provide additional data, and the waveform mapping method can not only reduce the number of sensors but also improve the identification accuracy of blade vibration parameters. The waveform mapping method has higher identification accuracy of blade vibration parameters compared with the waveform method in the reference.

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Section: Introductionmentioning

confidence: 99%

Vibration Parameters Identification of Rotating Blades Based on Blade Tip-Timing Sensor Waveforms

Zhang

Wang

2023

Applied Sciences

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“…The process of transferring the heat (Ghalandari et al, 2019;Zhao et al, 2021a, Zhao et al, 2021b between two fluids at different temperatures separated by a solid wall is common in many engineering applications (Che et al, 2021;Mahariq and Erciyas, 2017;Mahariq et al, 2020;Panahi and Zamzamian, 2017;Prabhanjan et al, 2002;Shafee et al, 2020;Zhao et al, 2021c). Heat exchangers are devices that allow heat to be transferred from one fluid to another without mixing the two fluids (Assad et al, 2021;Che et al, 2021;Chu et al, 2020;She and Fan, 2018;Zhou et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization of the Helical Heat Exchanger With Turbulator

et al. 2022

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In this paper, optimization on a two-tube helical heat exchanger with a fin is represented. The spiral pipes heat exchanger which is made of the cooper is adopted for investigation. The effects of three types of fins with the proposed geometric shapes on the overall heat transfer coefficient and pressure loss are investigated. The fins are located on the inner surface of the outer pipe. The obtained numerical results are compared with the experimental results, and a good agreement is observed between the results. The studies show that the total heat transfer coefficient has increased by 170% compared to an exchanger with no fin. Therefore, the best fin has been selected based on the benefit-cost-ratio (BCR) factor. Finally, using the new represented optimization algorithm, the height of the represented triangular fin is optimized to represent the best values for overall heat transfer coefficient and pressure loss of the helical heat exchanger. In addition, the results indicate that reducing the density and height of the triangular fin increases heat transfer and reduces pressure loss.

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“…Among the aeroelastic phenomena, self-vibrations, at a certain speed, which is called fluttering, are considered as the most common problem in coupled systems. This destructive phenomenon will lead to the aggravation of highamplitude vibrations effect [1]. In the absence of sufficient damping in the system, this will lead to structural failure [2].…”

Section: Introductionmentioning

confidence: 99%

Aeroelastic Optimization of the High Aspect Ratio Wing with Aileron

Ghalandari¹,

Mahariq²,

Ghadak³

et al. 2022

Computers, Materials &Amp; Continua

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In aircraft wings, aileron mass parameter presents a tremendous effect on the velocity and frequency of the flutter problem. For that purpose, we present the optimization of a composite design wing with an aileron, using machine-learning approach. Mass properties and its distribution have a great influence on the multi-variate optimization procedure, based on speed and frequency of flutter. First, flutter speed was obtained to estimate aileron impact. Additionally mass-equilibrated and other features were investigated. It can deduced that changing the position and mass properties of the aileron are tangible following the speed and frequency of the wing flutter. Based on the proposed optimization method, the best position of the aileron is determined for the composite wing to postpone flutter instability and decrease the existed stress. The represented coupled aero-structural model is emerged from subsonic aerodynamics model, which has been developed using the panel method in multidimensional space. The structural modeling has been conducted by finite element method, using the p-k method. The fluid -structure equations are solved and the results are extracted.

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Identification of nonlinear model for rotary high aspect ratio flexible blade using free vibration response

Cited by 15 publications

References 26 publications

Vibration Parameters Identification of Rotating Blades Based on Blade Tip-Timing Sensor Waveforms

Vibration Parameters Identification of Rotating Blades Based on Blade Tip-Timing Sensor Waveforms

Performance Optimization of the Helical Heat Exchanger With Turbulator

Aeroelastic Optimization of the High Aspect Ratio Wing with Aileron

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