ER4120: Computational Mechanics - Wind Turbine Blade Modelling - Engineering Assignment Help

Assignment Task:

Task:

Learning outcomes
The assignment should produce sufficient evidence for partial fulfillment of the following module learning outcomes:
• Solve specific research informed design problems associated with integrated mechanical engineering systems.

• Develop comprehensive design processes and methodologies and adapt them to unfamiliar research informed situa- tions.

• Demonstrate high level competencies in the use of computational modelling tools used in highly technical industries and academic research.

Additional information
You may wish to put LYX to use as demonstrated in the tutorial sessions for the presentation of selected parts this assignment. As with all assignments the final report should be type written and contain a integrity e.g.: This assignment has not been submitted before at this or any other educational establishment of learning in the support of a degree of any other award, on the title page.
As per the module specification, this assignment accounts for 60% of the module mark.

Resources: All resources, e.g.: ANSYS-Workbench, ANSYS-GRANTA Selector, wxMAXIMA, SCILAB and/or MAT- LAB are all available in on the main LIS Network; with student versions being available through the blackboard space.

Tasks
The first three tasks outlined herein should be completed in a group of five students, whist the final two tasks be completed individually. However, a number of results obtained from the group tasks must be used in order to complete the final individual submission. Where possible the sections of the final individual submission (excluding the prereport i.e.: title page, Table of Contents, List of Figures, List of Tables and Abstract) should not exceed ten sides of A4 (say 2500 words).m Any extra material not directly related to the demonstration/achievement of the module descriptor learning outcomes (e.g. Module descriptor) should be include in an appendix of a final report. Candidates are advised to refereed to relevant literature and/or class/lecture material and focus of the module aims are being explored [8]. It is the purpose of the final report to demonstrate to what learning has taken place throughout the whole assessment process and when/where the module learning outcomes have been achieved.
1. Assuming that each of the constituents of a unidirectional epoxy fibre-glass composite material is in abeyance with a so-called linear fatigue model:

σ m N N = A

where N is the the number of cycles at failure, σN is the failure strength at these number of cycles. Use software (e.g. ANSYS-GRANTA Selector1

) or literature [4, 5] to obtain salient fatigue data for E-glass and and epoxy. Thereafter use SCILAB (or MATLAB) to find cogent estimates of the fatigue strength coefficient A, and the index m.
{Task 1: 20 marks}
2. The NACA-2414 or a NACA-2415 aerofoil section are being considered for use in a small 4.2 m reinforced composite material blade. Critically evaluate the use of theses sections, given that the blade tapers uniformly from a chord length of 600 mm at one end to 300 mm at the other2
.

(a) The blade is to be manufactured from a 0.125 mm unidirectional material with the lay-up sequence [0/ − 45/90/45]20s
.
Produce a suitable 100 mm by 150 mm test piece token within the ANSYS-Workbench Static-structural module to estimate the effective mechanical properties of the material. Thereafter, verify your results using Classical Lamination Theory (CLT).
(b) Using the lay-up sequence described in the previous task use the ANSYS SpaceClaim and Mesher to produce a suitable surface model and mesh of the wind turbine blade. Perform an ANSYS structural static FEA [9] to evaluate the wing displacement under typical high wind-speed conditions. Assume that the lift force acts as a uniform distributed load and employ the structural error [10], to produce a mesh independent model.

(c) Use your ANSYS-FE model to predict the fatigue life, damage and safety factor, using: an orthotropic contin- uum material definition [9], i.e. employing the mechanical properties, found in task 1.

{Task 2: 30 marks}
3. Write-up all of your findings in a accepted scientific manner, producing a laboratory report contain the following sections:
• Introduction
– What are composite materials?
– What is FEA and why is it useful here?
– Why is fatigue analysis important?
• Methods
– Theory
∗ A brief presentation of salient equations from CLT.
∗ Brief explanation of FEA including the world famous formula [9, 10]:

k = Z Z Z V −→B T [D] −→B dV.

– Fatigue life, damage and saftey factor,
– Description of FEA and CFX methods, e.g. geometry generation, meshing, solution protocols etc.
– Analytic verification methods, i.e. application of key formulae from the theory section.

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