Design, fabrication, and testing of an active camber rotor blade tip

Blade Tip ◽

Mechanical Actuation ◽

This paper presents a morphing blade design for wind turbine application with flexibility in chord-wise bending while providing sufficient stiffness to carry the aerodynamic loads. The NACA64 profile is selected for the camber morphing blade demonstrator. A corrugation concept is chosen because it is relatively easy to manufacture and provides sufficient stiffness to resist deformation due to the aerodynamic loads (through the provision of effective stringers) while providing the required flexibility for chord-wise bending. A mechanical actuation mechanism is employed to achieve the desired morphing angle and increase the stiffness of the morphing airfoil section to resist aerodynamic loading. The design of a morphing blade demonstrator is presented together with the manufacturing process. Finally, an experimental study is conducted where the morphing angle is measured for increasing actuation load and compared with FE analysis showing good agreement between the experimental results and results from the finite element analysis in addition to achieving the desired morphing angle.

Structural Analysis of Centrifugal Fan Impeller Using CATIA Software

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.809-810.859 ◽

2015 ◽

Vol 809-810 ◽

pp. 859-864

Author(s):

Dănuţ Zahariea

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Structural Analysis ◽

Design Methods ◽

Constant Thickness ◽

Blade Design ◽

Centrifugal Fan ◽

Element Analysis ◽

Modes Of Vibration

In this paper, the finite element analysis for stress/deformation/modes of vibration for the centrifugal fan impeller with constant thickness backward-curved blades using CATIA software will be presented. The principal steps of the finite element analysis procedure using CATIA/Generative Structural Analysis environment will be presented: creating the 3D model; configuring the mesh; applying the restraints; applying the loads; running the numerical static analysis and the numerical frequency analysis; interpreting the results and observing the modes of vibration correlating with the impeller mode shape. This procedure will be used for 4 different centrifugal fan impellers according with the 4 blade design methods and the results will be comparatively analyzed. For each design method, two materials will be used: steel with density of 7860 kg/m3 and aluminium with density of 2710 kg/m3. Two important results have been obtained after the structural analysis: under the working conditions considered for the analysis, all 4 blade design methods leads to impellers with very good mechanical behaviour; any frequency of the main modes of vibrations for all blade design methods and for both materials is not in phase with the impeller speed, thus the possibility of resonance being eliminated.

Parallel Extrusion of Aluminum Alloy Heat Sink with Round-Fin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.739.131 ◽

2013 ◽

Vol 739 ◽

pp. 131-135

Author(s):

Li Han Zhang ◽

Ke Sheng Wang ◽

Yu Han ◽

Jia Yu Ying

Keyword(s):

Heat Sink ◽

Material Flow ◽

Extrusion Process ◽

Element Analysis ◽

Automotive Lighting ◽

Metal Sheets ◽

Alloy Heat ◽

Flow Through ◽

Parallel extrusion is a combined extrusion process for forming round-fin heat sink on thick metal sheets. In this paper, the parallel extrusion has been applied to manufacture the round-fin heat sink in the automotive lighting. Numerical simulations on the round-fin heat sink forming using the software DEFORM were carried out. The tooling structure with counterpressure on the heat sink formation was investigated. The results show that the tooling structure with counterpressure is helpful to the formation of round-fin heat sink, which not only ensures the height of each round-fin on the heat sink is uniform but also retards the initiation of flow-through on the reverse side of round-fin. In addition, the experiments of press forging process were conducted to validate the finite element analysis, it is shown that the friction at the punch-blank interface has more significant effect on preventing the initiation of flow-through compared with the friction at the die-blank interface, which implies that the punch-blank interface has more significant effect on the material flow in the formation of round-fin, and the simulation results are in good agreement with the experimental data.

Plastic Effects on High Cycle Fatigue at the Edge of Contact of Turbine Blade Fixtures

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4038040 ◽

2017 ◽

Vol 140 (4) ◽

Cited By ~ 1

Author(s):

C. H. Richter ◽

U. Krupp ◽

M. Zeißig ◽

G. Telljohann

Keyword(s):

Finite Element Analysis ◽

High Cycle Fatigue ◽

Turbine Blades ◽

Fatigue Tests ◽

Cycle Fatigue ◽

Element Analysis ◽

Notched Specimens ◽

Slip Region ◽

Slender turbine blades are susceptible to excitation. Resulting vibrations stress the blade's fixture to the rotor or stator. In this paper, high cycle fatigue at the edge of contact (EOC) between blade and rotor/stator of such fixtures is investigated both experimentally and numerically. Plasticity in the contact zone and its effects on, e.g., contact tractions, fatigue determinative quantities, and fatigue itself are shown to be of considerable relevance. The accuracy of the finite element analysis (FEA) is demonstrated by comparing the predicted utilizations and slip region widths with data gained from tests. For the evaluation of EOC fatigue, tests on simple notched specimens provide the limit data. Predictions on the utilization are made for the EOC of a dovetail setup. Tests with this setup provide the experimental fatigue limit to be compared to. The comparisons carried out show a good agreement between the experimental results and the plasticity-based calculations of the demonstrated approach.

Buckling Analysis on Pechiko Field of Fixed Offshore Platform in Makassar Strait

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.776.313 ◽

2015 ◽

Vol 776 ◽

pp. 313-318

Author(s):

Muhammad Zubair Muis Alie ◽

Y.R. Palentek ◽

D.G. Sesa

Keyword(s):

3D Model ◽

Compressive Load ◽

Fe Analysis ◽

Buckling Analysis ◽

Plane Section ◽

Offshore Platform ◽

Element Analysis ◽

Axial Compressive Load ◽

Fixed Offshore Platform ◽

One of the most important criterion in the design of fixed offshore platform is to have strength from applied loads which is acting perpendicular to jacket leg section such as axial compression.The axial compressive load acts vertically downward to jacket legs and the deformation on the jacket legs in horizontal direction due to this load is called buckling. In the present study, buckling analysis on pechiko field of fixed offshore platform is performed using Finite Element Analysis (FEA). The fixed jacket platform namely tripod and tetrapod are taken as the object of the analysis. Only the axial compressive load is used in the analysis and the boundary conditions are assumed to be fixed both tripod and tetrapod at the bottom seabed. As a fundamental case, buckling analysis is carried out in plane-section (2D analysis), then the result obtained by FE analysis is compared with the analytical solution.It is found that the result obtained by FE analysis for the critical buckling load is in good agreement with the analytical solution, and the applicability of FE analysis is further used to investigate the deformation of 3D model.

Life Assessment of Turbine Components Through Experimental and Numerical Investigations

Journal of Pressure Vessel Technology ◽

10.1115/1.4007962 ◽

2013 ◽

Vol 135 (2) ◽

Cited By ~ 5

Author(s):

Dianyin Hu ◽

Rongqiao Wang ◽

Guicang Hou

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Fatigue Life ◽

Life Prediction ◽

Life Assessment ◽

Element Analysis ◽

Creep Fatigue ◽

Turbine Component ◽

A new lifetime criterion for withdrawal of turbine components from service is developed in this paper based on finite element (FE) analysis and experimental results. Finite element analysis is used to determine stresses in the turbine component during the imposed cyclic loads and analytically predict a fatigue life. Based on the finite element analysis, the critical section is then subjected to a creep-fatigue test, using three groups of full scale turbine components, attached to an actual turbine disc conducted at 750 °C. The experimental data and life prediction results were in good agreement. The creep-fatigue life of this type of turbine component at a 99.87% survival rate is 30 h.

An Approximate Model to Calculate Foldover and Strains During Cold Upsetting of Cylinders Part II: Use of the Foldover Model to Estimate Friction

Journal of Engineering for Industry ◽

10.1115/1.2899585 ◽

1990 ◽

Vol 112 (3) ◽

pp. 267-271 ◽

Cited By ~ 14

Author(s):

O. M. Ettouney ◽

K. A. Stelson

Keyword(s):

Finite Element Analysis ◽

Approximate Model ◽

Ring Test ◽

Internal Diameter ◽

Cold Upsetting ◽

Element Analysis ◽

New Approach ◽

Friction Calibration ◽

This paper addresses an approach to calculate the friction coefficient during nonuniform compression of cylinders. The approach combines new friction-calibration curves (prepared using the finite-element analysis) that relate friction to workpiece shape and the foldover model from Part I. Foldover in upsetting is used in the same way that the change in internal diameter is used in the ring test to determine friction. However, the new approach has the advantage that measurements are taken directly from the workpiece. Comparisons of friction values calculated from the ring test and the new approach showed good agreement.

Static Analysis of Thin Film Piezoelectric Micro-Accelerometer Using Analytical and Finite Element Modeling

Microelectromechanical Systems ◽

10.1115/imece2003-41387 ◽

2003 ◽

Author(s):

Zhaochun Yang ◽

Qing-Ming Wang ◽

Patrick Smolinski ◽

Hongbo Yang

Keyword(s):

Finite Element ◽

High Sensitivity ◽

Element Analysis ◽

Beam Thickness ◽

Input Acceleration ◽

On Chip ◽

Micro Accelerometer ◽

Fixed Beam ◽

On-chip microaccelerometers using piezoelectric thin films has attracted much interest due to their simple structure and potentially high sensitivity. However, the relationships between the structure of the microaccelerometer and its performance still need to be further developed in more details. In this paper we present a theoretical model for a microaccelerometer with four suspended flexural PZT/silicon beams and a central proof mass configuration. The model takes into account the effect of device geometry and elastic properties of the piezoelectric film, and is supported by the finite element analysis. The good agreement of the results demonstrates the validity of the modeling assumptions. This study shows that the accelerometer sensitivity decreases with increasing the width and thickness of the bilayer beams, and elastic modulus of the mechanical microstructure, while increasing the length of the beam, increases sensitivity. For a fixed beam thickness, a maximum sensitivity exists for appropriate PZT/Si thickness. In addition, it is found that the sensitivity is also proportional to the magnitude of the input acceleration. The results of this study can be readily applied to for on-chip piezoelectric microaccelerometer design and its structural optimization.

The Effect of the Die Temperature on the Solidification Behaviour of the Al/SiCp Metal Matrix Composite: A Comparative Study of Experimental and Finite Element Analysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.893.314 ◽

2014 ◽

Vol 893 ◽

pp. 314-319

Author(s):

P. Gurusamy ◽

S. Balasivanandha Prabu ◽

R. Paskaramoorthy

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Time History ◽

Cooling Curves ◽

Element Analysis ◽

Solidification Behaviour ◽

Die Temperature ◽

Temperature Time ◽

This paper discusses the influence of die temperature on the solidification behaviour of A356/SiCp composites fabricated by squeeze casting method. Information on the solidification studies of squeeze cast composites is somewhat scarce. Experiments were carried out by varying the die temperatures for cylindrical shaped composite castings K-type thermocouples were interfaced to the die and the temperature-time history was recorded to construct the cooling curves. The cooling curves are also predicted from the finite element analysis (FEA) software ANSYS 13. The experimental and predicted cooling curves are not in good agreement. In addition to, the experimental and theoretical solidification times are studied. It was understood that the increase in the die temperature decreases the cooling rate.

Contact Stresses in Dovetail Attachments: Physical Modeling

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1415740 ◽

2002 ◽

Vol 124 (2) ◽

pp. 325-331 ◽

Cited By ~ 19

Author(s):

G. B. Sinclair ◽

N. G. Cormier

Keyword(s):

Finite Element ◽

Physical Modeling ◽

Physical Models ◽

Shear Stresses ◽

Major Contributor ◽

Element Analysis ◽

Large Fluctuations ◽

Hoop Stresses ◽

Simple physical models for the stresses in dovetail attachments are developed. These models address: to slip or not to slip, nominal stresses during loading up, peak contact and shear stresses during loading up, hoop stresses during loading up, peak contact and shear stresses during unloading, and hoop stresses during unloading. Comparisons are made with a previous paper on companion finite element modeling. Generally there is good agreement between the simple physical models and the finite element analysis. Together the two identify a pinching mechanism as leading to large fluctuations in hoop stresses at the edges of contact. These fluctuating hoop stresses can be expected to be a major contributor to the fatigue of dovetail attachments.

Proceedings 12th international conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018 ◽

Behavior of concrete-filled double skin steel tubular columns under eccentric compression after fire

10.4995/asccs2018.2018.7008 ◽

2018 ◽

Author(s):

Xiao Liu ◽

Jianye Xu ◽

Bing Wang

Keyword(s):

Full Range ◽

Element Analysis ◽

Steel Ratio ◽

Tubular Columns ◽

Eccentric Compression ◽

Fea Modeling ◽

Double Skin ◽

Good Agreement ◽

Eccentric Distance

Abstract: To analysis the behavior of the mechanical properties of concrete-filled double skin steel tubular (CFDST) columns under eccentric loads after fire, the finite element analysis was used. The established FEA modeling was verified by the experimental results which has a good agreement. The FEA modeling was then used to perform the temperature field and the full-range load-deformation relations of the CFDST subject to eccentric compression after exposed to fire. The results indicate that: with the time of fire increasing, the eccentric distance increasing, the steel ratio decreasing, the yield strength decreasing and compressive strength decreasing, the bearing capacity of CFDST in circle section under eccentric loads is showing a decrease trend, and the stiffness of component decreases with the time of fire increasing, the eccentric distance increasing and the steel ratio decreasing. The ductility of CFDST became better with the time of fire increasing and the eccentric distance increasing.