45 Questions 63 Answers 0 Followers
Questions related from Ahmed H. Abdulaziz
I need to know name of standards that provide allowed vaccum pressure in resin infusion.
03 March 2019 4,083 1 View
I study the delamination of laminates upper and bottom skins of honeycomb composite structure simple supported from two sides and under bending stress. I consider the developed tension on the...
02 February 2019 4,206 2 View
In FE some elements are overlapping. I read a paper says thst such overlapping causes higher in plane stiffness only. I wonder does the impact on accuracy of solutions very big?
02 February 2019 9,962 7 View
I know about mesh density, skewness, wrap angles, and aspect ratio. Per literature, aspect ratio is a quick tool to define quality of mesh. Is there a rule of thumb for acceptable values of...
02 February 2019 2,579 5 View
I do some experiments in using AE method to detect events. I can plot a lot of figures such as hits, signal strength, waveform, counts, events so on. Which data shall I concentrate on? A little...
01 January 2019 6,726 10 View
I'm a little bit confused in regard of implementing MMA method. Should I transform the objective function into a Taylor series in order to use this method? Most of tutorials explain the...
01 January 2019 7,977 4 View
I have developed a honeycomb sandwiched structure in Salome platform, meshed with netgen 2D, then calculated the compression stresses on it using Calculix open source FE. I tried to optimise the...
12 December 2018 1,016 1 View
I'd like to know the main parameters that should be considered in designing of injection mold. Also, I need to know a source for standardized calculations.
02 February 2018 716 4 View
I have a problem in understanding the coding of the Calculix examples. Is there any reference to help me understanding Calculix coding.
06 June 2017 7,872 2 View
We have a code for a benchmark problem. We used this code in Ansys 14 and in Ansys 17. However, we get two different nonsense solutions. Further, we repeated running the code on Ansys 14 and it...
04 April 2017 1,648 3 View
I searched in possible PhD topic in VAWTs especially the structural mechanics or optimization however most of things I 've found are related to aerodynamics only.
02 February 2017 2,770 3 View
Periodic structures can give outstanding mechanical/dynamical.
02 February 2017 4,252 3 View
I would like to know the research trends in using open source FE codes.
12 December 2016 8,172 2 View
I'm looking for a Ph.D. topic in the field of modeling of composite materials for wind turbine blades. For example, I think of developing a multiscale model to verify weakness zones under buckling.
12 December 2016 7,175 4 View
I'd like to know if Ex , Ey are measured along XYZ axis of geometry orientation or not. Check the photo attached.
12 December 2016 7,113 1 View
I'm interested in wind turbine blade design and analysis. I have a problem in finding a suitable point that meets my interests. Any Suggestions?
07 July 2016 6,335 3 View
I used ANSYS Workbench in the modal analysis of a structural frame. The structure is imported as solid body NOT surface model. I meshed it using mapped mesh option and hexa\tetra elements....
02 February 2016 9,098 5 View
I want to do acoustics emission experiment on wind blade made from fiber glass-polyester plies. I want to put values of (PDT-HDT-HLT) in the data acquisition system. How can I get them Thanks
02 February 2015 9,813 3 View
I have a cantilever steel beam of 1m length. I want to determine the strain near fixation due to the bending moment of a dead weight on the tip of the beam. I plan to place 3 strain gauges near...
01 January 2015 4,479 5 View
A wind blade consists of steel chassis and composite laminae as outer surface. I want to make bending stress on the blade. It fixed from end as cantilever. I will put strain gauge rosette near...
12 December 2014 2,312 3 View
I need to get the area moment of inertia.
10 October 2014 5,671 6 View
I have some problems in understanding criteria of computing MAC. This my second question on the same topic. I have an accelerometer on the tip of a wind turbine blade and after exciting it with...
10 October 2014 9,959 6 View
I performed modal analysis using Ansys and experimental modal analysis on a wind turbine blade. The deviation between FE and experimental measurement for higher modes (third mode shape) is so...
10 October 2014 2,890 10 View
I have a distorted model to a prototype. Dimensional scale for thickness is not same as other geometrical dimensions. I found that there is procedure to use distorted model to predict the...
10 October 2014 8,410 5 View
I want to learn deeply the optimization methods using genetic algorithms, It is the first time and I want to learn it to optimize design of wind turbines
09 September 2014 1,213 6 View
I used Buckinghum Pi theorem. I derived pi groups for the natural frequency phenomena. The first pi group was function of (natural frequency, E,Rho,Cantilever length) The second pi group was...
09 September 2014 3,498 3 View
I want to measure deflection of cantilever beam in micrometers.
09 September 2014 4,292 13 View
I want to use Buckinghum Pi Theorem to relate a similitude of the blade to the prototype blade. I began as stating the natural frequency is function of ( Young's Modulus, Length of the blade,...
09 September 2014 9,952 3 View
I'm confused little, Tests on blades are, Fatigue test and static bending test. Since blade is rotate 360 degree , how can we say that there is static component of aerodynamic on it (i.e. lift and...
09 September 2014 7,726 7 View
I have an error as shown , how can I delete the error messages that violate the memory span?
08 August 2014 913 3 View
I have a similitude of wind blade. The scale of length of prototype and similitude is not equal to scale of height of the cross section and the width of cross section differs from both. How can I...
08 August 2014 6,376 7 View
I have a stepped cantilever and I want to derive deflection formula to calculate the deflection at any point along this cantilever ! I've tried Castigliano's theorem but it gave me the tip...
07 July 2014 953 3 View
I work on developing a similitude of wind blade of length 0.30 m to a prototype of 7m length. I want to predict the deflection of the 7m blade to validate FE analysis. Because I cannot manufacture...
07 July 2014 4,478 3 View
I have no experience in submitting paper to a journal, I have modeled a 7m wind blade and solving it by FEM , I got its natural frequencies. because of difficulty of manufacturing 7m blade , I...
06 June 2014 7,344 2 View
I have a product made by 3d printer with material of ABS and I need to define its properties.
06 June 2014 6,366 8 View
I was working on getting non dimensional pi-groups for a model and scaled down similitude of cantilevers. For a cantilever : I got a pi1 =Deflection "u"/length"l" So i used u/l )model = u/l...
06 June 2014 4,065 1 View
I have done a vibrational analysis on an orthotropic ABS plastic wind turbine blade, it is required to set its 9 elastic properties. I searched and got a range for longitudinal modulus of ABS then...
05 May 2014 290 4 View
I work on testing a segmented HAWT blade of 7 m length. I want to submit my work to an international journal. Because I'm not an expert so I want a good journal but with suitable Impact Factor.
05 May 2014 8,662 1 View
I have a model of a wind turbine blade made of abs polymer. I made experimental measurements and did ansys simulation to get the atural frequencies and mode shapes. The results in the first mode...
04 April 2014 9,912 7 View
For fiber glass epoxy , the orientation of fibers at +45 degree or -45 degree in a ply increase the torsional stiffness and buckling resistance. I need to understand the reasons.
03 March 2014 3,559 5 View
I made a simulation of long blade of wind turbine 7 meters length. I cannot make a prototype to invalidate results of FEM of mode shapes and so on. I have an idea of using small similitude made...
03 March 2014 1,431 13 View
I have created a blade using the 3D technique, the material is ABS polymer and created as layers. This can be considered orthotropic material, so I have Ex,Ey,Ez. I want to know how can I get...
03 March 2014 8,040 3 View
I have created a simple model, a plate surface. I fixed one side with zero for all 6 degrees of freedom and other sides are free. I want to make Modal analysis and I made it with results for the...
02 February 2014 8,344 4 View
I'm using that element but results look very illogical.
02 February 2014 465 3 View
I need to compare my natural frequencies with other's model to check if my frequencies lie within a reasonable range or not.
02 February 2014 1,587 1 View
