scholarly journals Tabu Genetic Cat Swarm Algorithm Analysis of Optimization Arrangement on Mistuned Blades Based on CUDA

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Yi Cai ◽  
Junjie Gu ◽  
Honggang Pan ◽  
Hongyuan Zhang ◽  
Tianyu Zhao
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Synthesis Method ◽  
Solution Space ◽  
Element Model ◽  
Lumped Parameter Model ◽  
Algorithm Analysis ◽  
Engineering Practice ◽  
Disk System ◽  
Bladed Disk

Tabu genetic cat swarm optimization algorithm is proposed for optimization arrangement on mistuned blades. Furthermore, it is improved to be an innovative parallel algorithm based on Compute Unified Device Architecture (CUDA), whose performance is analyzed both in continuous and discrete solution space. The lumped parameter model and finite element model of the bladed-disk system are established for dynamics analysis and optimization verification. The complete mistuned parameter identification method and the improved mixed-interface prestressed substructure modal synthesis method are two other highlights. The results indicate that the algorithm in this paper has the advantages of low cost and high efficiency. The vibration localization and amplitude of the mistuned bladed-disk system are both reduced significantly. The optimization analysis method is proved to be applicable to the mistuned bladed-disk system of the aeroengine in engineering practice.

Analyze on the Mechanical Properties of Stitched Composites

2011 ◽  
Vol 217-218 ◽  
pp. 1758-1762
Author(s):  
Tao Chang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Low Cost ◽  
Element Model ◽  
Textile Composites ◽  
External Loading ◽  
Engineering Practice ◽  
Textile Composite ◽  
And Performance ◽  
Potential Member

As the most potential member in the textile composite material, stitched textile composites have already been paid a lot attention. By the simply technology form and relatively low cost, stitched composites had attracted many domestic and foreign researchers, and were gradually used in various engineering practice. This paper using 3D micro-finite element method researches the mechanical behavior and performance of stitched composites, establishing a 3D micro-finite element model for the stitched composites under the improved locking suture way. Through analysis, it shows that each material’s stress distribution characteristics under external loading and finds that the results of this paper’s finite element data results matching well with previous studies’ results, proving the feasibility of this study, so it can be used for forecasting the mechanical properties of a variety of practical stitched composites.

scholarly journals Vibrational Response Analysis of Mistuned Bladed Disk System of Grouped Blades

1998 ◽  
Author(s):  
Y. Kaneko ◽  
K. Mori ◽  
H. Ohyama ◽  
E. Watanabe
Keyword(s):  
Synthesis Method ◽  
Forced Response ◽  
Response Analysis ◽  
Analysis Method ◽  
Disk System ◽  
Vibrational Response ◽  
Bladed Disk ◽  
System A ◽  
Vibrational Characteristics ◽  
Grouped Blades

For the purpose of the efficient analysis of a mistuned bladed disk system, a new analysis method which applies the substructure synthesis method and the modal analysis method is proposed. Using the proposed method, the vibrational characteristics of the grouped blades structure are studied. From the results, it is found that the grouped blades structure is very sensitive to the mistuning. It is also found that the mixed grouped blades structure (a bladed disk system consisting of some different types of grouped blades relating to the number of blades contained) has an undesirable effect on the forced response. Moreover, by comparing the vibrational characteristics of the integral shroud blades (ISB) structure with those of the grouped blades structure, it is clarified that the reliability of the ISB structure is superior to other structures also from the viewpoint of the mistuning.

scholarly journals Dynamic characteristics of mistuned bladed disk system under rub-impact force

2020 ◽  
Vol 12 (11) ◽  
pp. 168781402097306
Author(s):  
Hui Zhang ◽  
Tianyu Zhao ◽  
Hongyuan Zhang ◽  
Honggang Pan ◽  
Huiqun Yuan
Keyword(s):  
Finite Element ◽  
Variable Thickness ◽  
Impact Force ◽  
Element Model ◽  
Force Model ◽  
Disk System ◽  
Element Analysis ◽  
Bladed Disk ◽  
Blade Tip ◽  
The Impact

In order to study the rubbing of the mistuned bladed disk system with variable thickness blades, an elastically supported shaft-variable thickness blades coupled finite element model is established in this paper. A new rubbing force model is proposed considering the variable thickness section characteristics and rotation effect of the variable thickness blade. A method of mistuned parameter identification is introduced which consists of static frequency testing of blades, dichotomy, and finite element analysis. Based on the finite element method, the mistuned bladed disk system is made dynamic analysis in full rubbing by applying the judgment load method. The dynamic response of the mistuned bladed disk system is discussed under different conditions. The results show that increasing the amount of mistuning will increase the system vibration. At high speeds, the impact force will be partially offset by centrifugal force. And the rubbing gap affects the form of rubbing. With the gap decreases, the system will change from intermittent rubbing to continuous rubbing. In addition, when the system is rubbed, due to energy dissipation and blade damping, the stress is transferred from the blade tip to the blade root and attenuated. In general, rubbing is a random complex nonlinear vibration process.

scholarly journals Coupled Free Vibration of Spinning Functionally Graded Porous Double-Bladed Disk Systems Reinforced with Graphene Nanoplatelets

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5610
Author(s):  
Tianyu Zhao ◽  
Yu Ma ◽  
Hongyuan Zhang ◽  
Jie Yang
Keyword(s):  
Free Vibration ◽  
Distribution Pattern ◽  
Plate Theory ◽  
Synthesis Method ◽  
Coupled Model ◽  
Graphene Nanoplatelets ◽  
Functionally Graded ◽  
Width Ratio ◽  
Disk System ◽  
Bladed Disk

This paper presents, for the first time, the mechanical model and theoretical analysis of free vibration of a spinning functionally graded graphene nanoplatelets reinforced composite (FG-GPLRC) porous double-bladed disk system. The nanocomposite rotor is made of porous metal matrix and graphene nanoplatelet (GPL) reinforcement material with different porosity and nanofillers distributions. The effective material properties of the system are graded in a layer-wise manner along the thickness directions of the blade and disk. Considering the gyroscopic effect, the coupled model of the double-bladed disk system is established based on Euler–Bernoulli beam theory for the blade and Kirchhoff’s plate theory for the disk. The governing equations of motion are derived by employing the Lagrange’s equation and then solved by employing the substructure mode synthesis method and the assumed modes method. A comprehensive parametric analysis is conducted to examine the effects of the distribution pattern, weight fraction, length-to-thickness ratio, and length-to-width ratio of graphene nanoplatelets, porosity distribution pattern, porosity coefficient, spinning speed, blade length, and disk inner radius on the free vibration characteristics of the FG-GPLRC double-bladed disk system.

Application of a Reduced Order Modeling Technique for Mistuned Bladed Disk-Shaft Assemblies

2007 ◽  
Author(s):  
Bartolome´ Segui´ ◽  
Euro Casanova
Keyword(s):  
Finite Element ◽  
Synthesis Method ◽  
Element Model ◽  
Reduced Order Modeling ◽  
Forced Response ◽  
Modeling Technique ◽  
Disk Model ◽  
Reduced Order ◽  
Bladed Disk ◽  
Global Dynamic

This paper presents a reduced-order modeling technique, based on a component mode synthesis method specifically tailored for bladed disks, that allows the resulting low-order model to be attached to a shaft. Mistuning is included in the bladed disk model and the shaft is modeled using uniaxial finite elements according to the rotordynamic approach. The proposed formulation is applied to an example finite element model of a bladed disk, for both tuned and mistuned blades. Comparisons are made between the reduced model and the full finite element solution for free and forced responses in order to assess the methodology. The forced response amplitudes of the blades are found to vary significantly with the inclusion of a flexible shaft. This work suggest that stage independent analyses might not be adequate for predicting the global dynamic response of rotating assemblies of turbomachines.

FEM Dynamic Analysis of Continuous Rolling Pass of Seamless Tubes

2011 ◽  
Vol 704-705 ◽  
pp. 1487-1491
Author(s):  
Zhi Long Feng ◽  
Xu Ma ◽  
Jing Yun Ma ◽  
Xiao Yu Zhou ◽  
Hui Qiang Liu ◽  
...  
Keyword(s):  
Cross Section ◽  
High Efficiency ◽  
Rolling Force ◽  
Low Cost ◽  
Deformation Characteristic ◽  
Element Model ◽  
Continuous Rolling ◽  
Pass Design ◽  
Rolling Pass ◽  
Result Show

The development of new products of seamless tubes require the development of corresponding grooves in order to manufacture tubes with high precision, high efficiency at low cost. In this work, a finite element model and dynamic simulation of continuous rolling pass for seamless tubes process has been implemented under the ANSYS/LS-DYNA environment to verify the validity of the pass design. The result show the deformation characteristic of cross-section, the variation regularity of rolling force, strain and stress conform to the reality. The work is effective for developing new grooves and products for seamless tube continuous rolling.

scholarly journals Effects of Thermal Undercooling and Thermal Cycles on the Grain and Microstructure Evolution of TC17 Titanium Alloy Repaired by Wire Arc Additive Manufacturing

2021 ◽  
Author(s):  
Yimin Zhuo ◽  
Chunli Yang ◽  
Chenglei Fan ◽  
Sanbao Lin
Keyword(s):  
Titanium Alloy ◽  
Additive Manufacturing ◽  
High Efficiency ◽  
Low Cost ◽  
Single Layer ◽  
Element Model ◽  
Maximum Effect ◽  
Thermal Cycles ◽  
Layer Deposition ◽  
Wire Arc Additive Manufacturing

Abstract Wire arc additive manufacturing (WAAM) can be used to repair blades or blisk made of titanium alloy with the advantage of high efficiency and low-cost. In this work, the finite element model of repairing the blade based on the arc heat source was established to investigate it. Results showed that the maximum effect of thermal undercooling appears when the peak current transforms to the base current (1Hz or 5Hz), which will promote the grains refinement with the combination of sufficient constitutional supercooling. Compared to the single-layer deposition, the microstructure in the near-heat affected zone (near-HAZ) of multi-layer deposition changes from the metastable β phases to the extremely fine α phases, which was caused by the repeated thermal cycles.

scholarly journals Numerical Investigation of an Academic Mistuned Bladed Disk Dynamics Accounting for Blade/Casing Contacts

2019 ◽  
Author(s):  
Jeanne Joachim ◽  
Florence Nyssen ◽  
Alain Batailly
Keyword(s):  
Time Integration ◽  
Synthesis Method ◽  
Aircraft Engine ◽  
Element Model ◽  
Integration Scheme ◽  
Bladed Disk ◽  
Structural Context ◽  
Time Integration Scheme ◽  
Blade Tip ◽  
Linear And Nonlinear

Abstract This contribution focuses on the combined analysis of mistuning and unilateral blade-tip/casing contacts. A 2D phenomenological finite element model of an aircraft engine fan stage is considered. It is reduced by means of the Craig-Bampton component mode synthesis method and contact treatment relies on a Lagrange multiplier algorithm within an explicit time-integration scheme. Blade-tip/casing contacts are initiated through the deformed shape of a perfectly rigid casing. Mistuning is accounted for on the blades only. Monte Carlo simulations are carried out in both linear and nonlinear configurations, which allows to compare amplifications predicted in both context due to mistuning. Following a thorough convergence analysis of the proposed numerical strategy, the influence of mistuning level as well as the configuration of the external forcing are investigated. Presented results underline the detrimental consequences of mistuning in a nonlinear structural context, yielding even higher vibration amplifications than in a linear context. A cross-analysis between linear and nonlinear computations reveals that no correlation is found between linear and nonlinear amplifications which suggests that the effect of existing strategies to mitigate vibration amplifications within a linear context may not be suitable within a nonlinear context.

Parallel intelligent algorithm analysis of optimization arrangement on mistuned blades based on compute unified device architecture

2018 ◽  
Vol 233 (6) ◽  
pp. 2207-2218 ◽  
Author(s):  
Tianyu Zhao ◽  
Hongxin Li ◽  
Huagang Sun
Keyword(s):  
Ant Colony Algorithm ◽  
Ant Colony ◽  
Algorithm Analysis ◽  
Processing Unit ◽  
Compute Unified Device Architecture ◽  
Disk System ◽  
Bladed Disk ◽  
Device Architecture ◽  
Parameterized Model ◽  
Combined Algorithm

This paper sets up a parameterized model of engine-bladed disk system. Then a method of mistuned parameter identification is proposed, which consists of static frequency test of blades, dichotomy, and finite element analysis. Dynamic genetic ant colony optimization combined algorithm is presented which is used as a bladed arrangement optimization method. It combines the advantage of ant colony algorithm and genetic algorithm. By this way, the local and global search ability is introduced and the disadvantage of a single algorithm is overcome. The improved parallel algorithm comes up with graphics processing unit based on compute unified device architecture and its performance is analyzed. The results show that using optimization results can reduce the amplitude and localization of forced vibration response of bladed-disk system. At the same time, optimization based on compute unified device architecture framework can improve computing speed. Providing support for engineering application in terms of effectiveness and efficiency.

scholarly journals Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

2021 ◽  
Vol 10 (2) ◽  
pp. 291-300
Author(s):  
Zhilei Wei ◽  
Kang Li ◽  
Bangzhi Ge ◽  
Chaowei Guo ◽  
Hongyan Xia ◽  
...  
Keyword(s):  
Particle Size ◽  
Combustion Temperature ◽  
High Efficiency ◽  
Raw Materials ◽  
Low Cost ◽  
Synthesis Method ◽  
Preparation Methods ◽  
Average Size ◽  
Micrometer Size

AbstractSpherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 µm were successfully synthesized via an in-situ combustion synthesis method. The effect of N2 pressure, NH4Cl content, and Al particle size on the combustion reaction procedure, phase composition, and microstructure of the products was systematically investigated. The results showed that the decreased N2 pressure, increased NH4Cl content, and Al particle size led to the decreasing of combustion temperature and speed, which further affected the morphology of the products. As a result, low N2 pressure (0.2 MPa), a small amount of NH4Cl (0.5 wt%), and fine Al particles (∼2.5 µm) contributed to a moderate combustion temperature and facilitated the formation of nearly spherical AlN particles. In addition, based on the gas-releasing assisted quenching experiments and thermo-kinetic analysis, a two-step growth mechanism for the nearly spherical AlN particles was rationally proposed. The present method shows the advantages of low cost and high efficiency for preparing nearly spherical AlN particles, which can be used as raw materials for electronic substrates and fillers for packaging materials.

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