On Structural Optimization of The Propeller Blade

2018 ◽  
Vol 7 (4.36) ◽  
pp. 1203
Author(s):  
Mikhail Aleshin ◽  
Aleksandr Smirnov ◽  
Margarita Murzina ◽  
Yuri Boldyrev
Keyword(s):  
Composite Material ◽  
Structural Optimization ◽  
Computational Time ◽  
Geometrical Parameters ◽  
Propeller Blade ◽  
Aerodynamic Loads ◽  
Change Mechanism ◽  
Blade Shape ◽  
Optimization Parameters ◽  
Propeller Blades

The results of the structural optimization of propeller blades are presented taking into account its composite structure and pitch change mechanism of the propeller and using FSI (Fluid-Structure Interaction) approaches.  The optimality criterion of the problem is the propeller thrust with optimization parameters being the characteristics of the internal structure of the propeller blade made from a composite. Together with the optimization of the blade shape, the problem is considered which concerns the reduction of the deformations caused by loads occurring during the operation of the propeller, since significant deformations of the blades lead to decreased thrust.Thus, the following optimization problem can be formulated: to find the optimal configuration of the composite material and its micro-geometrical parameters along the height of the blade to minimize deformations and increase the thrust of the propeller.  At the same time, the optimization parameters are limited by the weight of the propeller and the strength characteristics.The technique presented in the paper allows us to obtain the reliable values of thrust and reduce the estimated computational time.  The influence of the structure of the composite material on the mechanical properties of the blades is shown; the values of deformation of the blades under the action of centrifugal and aerodynamic loads are given.   

scholarly journals On Structural Optimization of the Propeller Blade

2018 ◽  
Vol 7 (4.36) ◽  
pp. 1203
Author(s):  
Mikhail Aleshin ◽  
Aleksandr Smirnov ◽  
Margarita Murzina ◽  
Yuri Boldyrev
Keyword(s):  
Composite Material ◽  
Structural Optimization ◽  
Computational Time ◽  
Geometrical Parameters ◽  
Propeller Blade ◽  
Aerodynamic Loads ◽  
Change Mechanism ◽  
Blade Shape ◽  
Optimization Parameters ◽  
Propeller Blades

The results of the structural optimization of propeller blades are presented taking into account its composite structure and pitch change mechanism of the propeller and using FSI (Fluid-Structure Interaction) approaches.  The optimality criterion of the problem is the propeller thrust with optimization parameters being the characteristics of the internal structure of the propeller blade made from a composite. Together with the optimization of the blade shape, the problem is considered which concerns the reduction of the deformations caused by loads occurring during the operation of the propeller, since significant deformations of the blades lead to decreased thrust.Thus, the following optimization problem can be formulated: to find the optimal configuration of the composite material and its micro-geometrical parameters along the height of the blade to minimize deformations and increase the thrust of the propeller.  At the same time, the optimization parameters are limited by the weight of the propeller and the strength characteristics.The technique presented in the paper allows us to obtain the reliable values of thrust and reduce the estimated computational time.  The influence of the structure of the composite material on the mechanical properties of the blades is shown; the values of deformation of the blades under the action of centrifugal and aerodynamic loads are given. 

Numerical Investigation of a Marine Propeller Blade for Material Effect and Stress Behaviour

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
M.L. Pavan Kishore ◽  
Srijith S. Donthi ◽  
U. Sai Krishna
Keyword(s):  
Composite Material ◽  
Research Work ◽  
Deformation Pattern ◽  
Marine Propeller ◽  
Propeller Blade ◽  
Marine Propulsion ◽  
Behavioural Characteristics ◽  
Propeller Blades ◽  
Stress And Deformation ◽  
Stress Behaviour

The process of designing a marine propeller for under water applications involves various complex analyses. Analysis is of iterative in nature which makes it cumbersome and inefficient to understand. A part of the research work entitled in this paper is concerned with the material effect and stress behavioural characteristics of a marine propeller blade subjected to cantilever condition. Designing and analysing the behaviour of an anisotropic composite material is one of the most important technologies in the area of marine propulsion. Based on FEM the conventional and composite material marine propeller blades are analysed. To simulate the blade layup and to determine the stress characteristics, ANSYS software with shell 181 elements is taken for reference. A study has also been carried out for determining the stress and deformation pattern arising due to varying ply layup and material. The obtained numerical results are then compared and summarised in. Computational efficiency and integrity of the presently adapted method in this work are determined by several case studies.

STRENGTHENING SUPPORTING COLUMNS WITH CARBON CONCRETE

2021 ◽  
Vol 95 (3) ◽  
pp. 59-67
Author(s):  
K. HOLSCHEMACHER ◽  
◽  
A.G. BULGAKOV ◽  
W. POLIENKO ◽  
◽  
...  
Keyword(s):  
Composite Material ◽  
Building Materials ◽  
Point Load ◽  
Geometrical Parameters ◽  
Building Structures ◽  
Technical School ◽  
Load Bearing ◽  
Floor Slabs ◽  
Wide Range ◽  
The Subject

Textile concrete is an innovative composite material that has been the subject of intensive research since the beginning of the 90s of the last century. After the approval of the rules and regulations on its application to strengthen floor slabs, an important step was taken towards its entry into the building materials market. Questions regarding the reinforcement of rod-shaped load-bearing elements of building structures need additional research. Despite the great potential available, the method of tying load-bearing supports and columns is still not well understood. There is a need for research on a wide range of geometric parameters and the reinforcement systems used. The Institute of Reinforced Concrete of the Higher Technical School in Leipzig tested various samples of carbon-reinforced samples in a wide range of geometrical parameters. Their goal was to assess the effect on a possible increase in the bearing capacity of carbon-reinforced columns at a concentrated point load.

Finite Element Modeling of Steel Pipeline Reconstruction Using Fiberglass Composite Material

2015 ◽  
Vol 725-726 ◽  
pp. 648-653 ◽  
Author(s):  
Ekaterina A. Nekliudova ◽  
Artem S. Semenov ◽  
S.G. Semenov ◽  
Boris E. Melnikov
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Stress State ◽  
Elastic Moduli ◽  
Strength Properties ◽  
Geometrical Parameters ◽  
Effective Elastic Moduli ◽  
Composite Part ◽  
Steel Pipeline ◽  
Fiberglass Composite

A stress state of the partially damaged underground steel pipeline after reconstruction by means of the fiberglass composite material is considered. The strength properties of the composite are determined experimentally. The effective elastic moduli of the composite are determined by means of the finite element homogenization. Tsai-Wu failure criterion is used for the composite part of the pipeline. The influence of geometrical parameters and loading conditions on the safety factor of the pipeline is analyzed and discussed.

Application of pressure sensitive paint for determination of aerodynamic loads and moments on propeller blade

2006 ◽  
Author(s):  
V. P. Kulesh ◽  
V. E. Mosharov ◽  
A. A. Orlov ◽  
S. P. Ostroukhov ◽  
V. N. Radchenko
Keyword(s):  
Pressure Sensitive Paint ◽  
Propeller Blade ◽  
Aerodynamic Loads ◽  
Pressure Sensitive

scholarly journals Design and Analysis of Propeller Blade to Augument the Effectiveness in Composite Material

2017 ◽  
Vol V6 (03) ◽  
Author(s):  
A. Senthil Athiban ◽  
X. Arnold ◽  
H. Arun Kumar ◽  
S. Harishraj, A.Manikandan ◽  
Keyword(s):  
Composite Material ◽  
Propeller Blade

Optimization Methodology for Innovative Automotive Crash Absorbers

2013 ◽  
Author(s):  
Luca D’Agostino ◽  
Luca Bertocchi ◽  
Luca Splendi ◽  
Antonio Strozzi ◽  
Patrizio Moruzzi
Keyword(s):  
Variable Thickness ◽  
Numerical Study ◽  
Computational Cost ◽  
Maximum Energy ◽  
Computational Time ◽  
Geometrical Parameters ◽  
Mass Ratio ◽  
Element Analysis ◽  
Vehicle Simulation ◽  
Full Vehicle

The simulation of vehicle crash impacts requires accurate and computationally expensive Finite Element analysis. An effective procedure consists in considering and establishing which improvement can be made on an equivalent sub-model of the full vehicle. In this way, all the analysis can be performed on smaller models, thus saving computational time. A full vehicle simulation is required only at the end of the design process to validate the results of the sub-model analysis. A software based on a genetic optimization algorithm has been developed in order to optimize the geometrical parameters of a variable-thickness crash absorber. A numerical study on the folding of thin-walled aluminum tubes with variable-thickness has been performed in order to achieve the maximum energy absorption-to-mass ratio. Moreover, the performance in terms of folding length and crush load peaks have been considered. Different optimization strategies have been implemented to find out which solution guarantees the achievement of the optimization target with the lowest computational cost. The results show how the approach proposed by the authors allows an efficient variable-thickness crash absorber to be obtained. In fact it performs better in term of crash behavior and energy dissipation-to-mass ratio, with respect to the original constant_thickness model.

A Method for Propeller Blade Optimization and Cavitation Inception Mitigation

2015 ◽  
Vol 31 (02) ◽  
pp. 88-98
Author(s):  
Brenden Epps ◽  
Oscar Víquez ◽  
Chryssostomos Chryssostomidis
Keyword(s):  
High Speed ◽  
Maximum Speed ◽  
Propeller Blade ◽  
Lower Efficiency ◽  
Design Point ◽  
Operational Conditions ◽  
Cavitation Inception ◽  
Cavitation Performance ◽  
Blade Shape ◽  
Present Design

Propeller blade design for fast ships is often driven by cavitation constraints. A tradeoff exists, in which larger chord lengths and section thicknesses typically improve cavitation performance but result in lower efficiency. Typically, chord lengths are optimized for the design condition (ship endurance speed) with some specified margin to prevent cavitation off-design (at maximum ship speed). Cavitation performance at the maximum speed is considered postfacto, and blade shape often needs to be modified for cavitation considerations in high-speed operation. This article presents an improved method for blade shape optimization. The present method simultaneously considers the cavitation performance at the endurance speed design point and a maximum speed off-design point, and blade chord lengths and thicknesses are set to prevent cavitation at both operational conditions. During the present design optimization routine, the on-design load distribution is optimized, and the off design performance is determined such that the chord lengths can be set to a minimum that still prevents cavitation at both the on- and off-design conditions. A case study is presented, considering the notional design of a propeller for the U.S. Navy DDG51 destroyer-class ship. Propellers designed using standard chord/thickness optimization procedures are compared with those designed using the present procedures. Cavitation performance is compared for the two design methods.

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