Prediction of vibration characteristics of blisks using similitude models

Zhang, Luo; Wang, You; Zhai, Jingyu; Zhu, Yunpeng; Wang, Deyou

doi:10.1080/15397734.2018.1481427

Cited by 19 publications

(6 citation statements)

References 32 publications

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“…Blisk blades are thin-walled structures and are subjected to vibration with the flow (Luo et al. , 2019).…”

Section: Resultsmentioning

confidence: 99%

Investigation of electrolyte pressure effect on blisk blades during electrochemical machining

Aslan,

Kanber,

Demirtas

et al. 2024

MMMS

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PurposeThe purpose of this study is analysis of deformation and vibrations of turbine blades produced by high electrolyte pressure during electrochemical machining.Design/methodology/approachAn experimental setup was designed, experiments were conducted and the obtained results were compared with the finite element results. The deformations were measured according to various flow rates of electrolyte. In finite element calculations, the pressure distribution created by the electrolyte on the blade surface was obtained in the ANSYS® (A finite element analysis software) Fluent software and transferred to the static structural where the deformation analysis was carried out. Three different parameters were examined, namely blade thickness, blade material and electrolyte pressure on blade disk caused by mass flow rate. The deformation results were compared with the gap distances between cathode and anode.FindingsLarge deformations were obtained at the free end of the blade and the most curved part of it. The appropriate pressure values for the electrolyte to be used in the production of blisk blades were proposed numerically. It has been determined that high pressure applications are not suitable for gap distance lower than 0.5 mm.Originality/valueWhen the literature is examined, it is required that the high speed flow of the electrolyte is desired in order to remove the parts that are separated from the anode from the machining area during electrochemical machining. However, the electrolyte flowing at high speeds causes high pressure in the blisk blades, excessive deformation and vibration of the machined part, and as a result, contact of the anode with the cathode. This study provides important findings for smooth electro chemical machining at high electrolyte flows.

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“…Blisk blades are thin-walled structures and are subjected to vibration with the flow (Luo et al. , 2019).…”

Section: Resultsmentioning

confidence: 99%

Investigation of electrolyte pressure effect on blisk blades during electrochemical machining

Aslan,

Kanber,

Demirtas

et al. 2024

MMMS

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show abstract

“…To sum up, when investigating the vibration characteristics of the TDS through FEA, some researchers tend to treat the turbine disk and blades separately, while others prefer to treat the turbine disk and blades as a whole. 10,11 These methods simplified the analysis process and ignored the assembly between different components. However, these methods were accurate only in some situations.…”

Section: Introductionmentioning

confidence: 99%

Vibration characteristics analysis of a type of turbine disk-blade assembly system in the civil aero-engine

Zhao

et al. 2022

Advances in Mechanical Engineering

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The coupled vibration in the turbine disk-blade system (TDS) is one of the main bottlenecks that hinder the further development of high-performance engines. To analyze the vibration of the TDS, three types of contact conditions, involving bonded, frictionless, or frictional were used to simulate the contact between the turbine disk and the blades. Three finite element analysis (FEA) models of a typical TDS based on the tenon structure were developed. The experimental system was developed and experimental modal analysis (EMA) was performed. According to the comparison between FEA and EMA results, the most accurate model is the frictional contact FEA model. The average error of the frictional contact FEA model is 1.42%, and the root mean square error is 0.75%. The working modes of the TDS at different speeds were calculated using the frictional contact FEA model. Meanwhile, based on the newly developed FEA model, it is found that the weak links in the TDS are the blades. This work can provide a theoretical basis for the TDS structure optimization and promote the development of high-quality aero-engines.

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“…Coutinho et al (2016) reviewed a scaling method based on similitude theory on structural engineering, while Zhu et al (2017) reviewed on plate and shell vibration. Many other researchers did investigation on applying the scaling laws such as on rectangular thin plates (Singhatanadgid and Songkhla, 2007), rotating thin-wall short cylindrical shell (Luo et al, 2015), laminated I-beam (Asl et al, 2017), displacement of a linearly elastic crack beam (Kasivitamnuay and Singhatanadgid, 2018), hybrid machine tool (Song et al, 2020), blisks vibration characteristics (Luo et al, 2019), rectangular plates (Zhang et al, 2020), and rotor-bearing system (Li et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Gyroscopic effect on a scaled rotor-bearing system

Dewi¹,

Abidin

Budiwantoro

et al. 2022

Journal of Vibration and Control

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This paper deals with scale-fullscale models of rotor-bearing systems on rotating condition. The investigation is focused on the gyroscopic effect, which causes forward and backward whirl frequencies. When the rotor-bearing system is scaled proportionally in its dimension (height, length, and width), the scaling factor of whirl frequencies can be derived. It depends on the ratio between a transverse and polar moment of inertia on its rotating axis called the gyroscopic factor. The experimental study is conducted to validate it on three scaled rotor-bearing systems, which shifts its disc from the middle of the shaft on the scale of 1:1, 2:1, and 3:1 to clearly show the gyroscopic effect on first bending natural frequency. The scaling factor is then validated using the Campbell diagram by finding its critical speed. From this critical speed, the whirl frequencies along the range of the full-scale model speed can be obtained. The result also shows that the scaling factor remains the same whether it is at rotation or rest condition. Consideration must be made on the effect of the structural design, that is, blade and support, because of its unsymmetric stiffness that can cause backward whirl frequencies. The bearing stiffness must be ensured to be scaled proportionally, especially on journal bearing cases. This finding can be used by engineers to deal with scaling method implementation on rotating machinery design.

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Prediction of vibration characteristics of blisks using similitude models

Cited by 19 publications

References 32 publications

Investigation of electrolyte pressure effect on blisk blades during electrochemical machining

Investigation of electrolyte pressure effect on blisk blades during electrochemical machining

Vibration characteristics analysis of a type of turbine disk-blade assembly system in the civil aero-engine

Gyroscopic effect on a scaled rotor-bearing system

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