Deflections and Frequency Analysis in the Milling of Thin-Walled Parts With Variable Low Stiffness

Kononenko, Serhii; Dobrotvorskiy, Sergey; Basova, Yevheniia; Gasanov, Magomediemin; Dobrovolska, Ludmila

doi:10.14311/ap.2019.59.0283

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…Abidat [9] and Abidat et al [10] developed a new method of blade profile generation using the Bezier polynomials. The works [11][12] include research to ensure high-quality mechanical machining of turbine blades for regular operation. Abidat et al [13] studied the clearance effect between the rotor blades and the casing on the mixed turbine performance.…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis of the Three-Dimensional Accelerating Flow in A Mixed Turbine Rotor

Chelabi¹,

Basova²,

Hamidou³

et al. 2021

JES

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An investigation on new rotor blade designs conceived to produce higher exit relative kinetic energy of a mixed flow turbine is undertaken. Accelerating the flow through the rotor in a relative frame of reference improves energy transfer to the shaft, which is only produced in a rotating rotor. A three-dimensional converging rotor channel might respond to the analysis requirements in the subsonic flow regimes. Effectively, the machine experiences a 3.71 % and 3.67 % increase in work output and efficiency, respectively, representing this study’s primary intent. This has been accomplished by varying the shroud profile to a lesser eye tip diameter, then the hub profile to a larger eye root diameter. At last, both shroud and hub profiles are varied. It appears possible to enhance the performance of the rotor in terms of optimum work done and efficiency by devising suitable blade geometry designs. ANSYS CFX 15 is the code of all simulation works.

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Section: Literature Reviewmentioning

confidence: 99%

Analysis of the Three-Dimensional Accelerating Flow in A Mixed Turbine Rotor

Chelabi¹,

Basova²,

Hamidou³

et al. 2021

JES

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“…13). It should be noted that the proposed method does not take into account the influence of vibrations arising from the machining of non-rigid (thinwalled) parts [34][35][36] and requires further development.…”

Section: Figure 12: Variation Of Machining Parameters: (A) -Variation Of Spindle Speed Along a Trajectory; (B) -Variation Of Feed To The mentioning

confidence: 99%

Numerical Control of Machining Parts From Aluminum Alloys With Sticking Minimization

2021

IJOMAM

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To implement a lot of technological processes in the manufacturing of aircraft parts from aluminum alloys, it is necessary to move the tool at a high speed. High requirements for accuracy and manufacturing quality aircraft parts are provided with application of CNC systems with adaptive control algorithms, in which due the mutual influence of the process parameters provided by the parameters of quality and accuracy. Among a number of factors adversely affecting the quality of high speed machining of aluminum alloys in the paper questions influence Lookahead system distortion predetermined (set up) cutting parameters on the formation conditions of the sticking material to the tool. The paper deals with high-speed machining without the use of a cooling lubricant (coolant). The paper provides a qualitative description of the heat generation variation in the cutting zone. It is concluded that it is necessary to cutting speed variation when feed variating. An experimental investigation of the cutting parameters for the appearance of the effect of the processed material sticking on the tool for alloy 1933 has been carried out. Areas of an unfavorable (negative) combination of parameters leading to the sticking of the material to the tool have been identified. The method of cutting modes adaptation to contour feed rate variation on curvilinear areas of a processing trajectory is proposed. The analysis of variation in cutting parameters with the partial deceleration of the spindle simultaneously with the deceleration of feed when moving along the path is carried out. The possibility of excluding the sticking of the processed material to the tool when variation the rotation speed by 20…30% is shown. The proposed method is implemented in the CNC system and used for manufacturing of "Antonov" company airplane parts.

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“…It has been established [45] that for larger absolute exit kinetic energies, for values of deviation blade angle between −10 • and −20 • , an exhaust diffuser is recommended to recover a part of it into a greater expansion ratio. Kononenko et al [46] examined the deflections and frequency in the milling of thin-walled parts with variable low stiffness; Dobrotvorskiy et al [47] developed an optimum thin-walled parts milling parameters calculation technique. This study will present the effect of inlet average diameter to exducer mean root diameter ratio on mixed inflow turbine performances in two cases.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Main Geometrical Parameters on the Design and Performance of Mixed Inflow Turbines

Chelabi¹,

Dobrotvorskiy

Basova

et al. 2022

Applied Sciences

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The blade shape is of great interest to hybrid turbine designers, due to its significant and direct impact on turbine performance. The inlet and outlet diameters of the vane affect the size of the rotor, which is limited because of the small space available in internal combustion engines. The effect of the ratio of the average inlet diameter and the average exducer inlet diameter on the performance of a mixed inlet turbine will be the focus of this study, which consists of two cases included herein for the purpose of illustrating the means of improving rotor performances and controlling the flow mass rate. In the first case, we achieved this by changing the average diameter of the exducer inlet, while, in the second one, we achieved this by changing the average inlet diameter. Additionally, the angles of the inlet and outlet blades were recalculated to preserve the same blade profile and to eliminate the effect of curvilinearity. It was noted that the shape of the blade was very sensitive to changes in the ratio of the investigated diameters, and—in both cases—interesting results were obtained. First, an increase in output work and in total static isentropic efficiency by 2.16% and 2.15%, respectively, was generated, with a saving of 3.52% of the used mass flow and a lighter rotor compared to one that used to take up the same space by using fixed average inlet diameter blades. In the second case, there was an increase in the output work by 3.31%, and in the total static isentropic efficiency by 3.34%, but the rotor became heavier and required an increase in the mass flow used. Since inter-blade flows are very complex, three-dimensional and viscous—featuring various types of secondary and eddy flows—the CFX.15-CFD code was used in all models to solve the averaged Navier–Stokes equations.

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Deflections and Frequency Analysis in the Milling of Thin-Walled Parts With Variable Low Stiffness

Cited by 8 publications

References 16 publications

Analysis of the Three-Dimensional Accelerating Flow in A Mixed Turbine Rotor

Analysis of the Three-Dimensional Accelerating Flow in A Mixed Turbine Rotor

Numerical Control of Machining Parts From Aluminum Alloys With Sticking Minimization

Influence of the Main Geometrical Parameters on the Design and Performance of Mixed Inflow Turbines

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