Computer Aided Engineering Journal & Forums - All Forums

Abaqus - seinmic analysis - time History analysis

Wed, 01 Sep 2010 08:34:57 -0600

Good afternoon.

I started using Abaqus and I have to do with analyzing seismic with time history analysis.
My question is, how to indicate the direction of the earthquake in the model?
Thank you very much

help to get the cycles of dynamics analysis & determine the place of failure

Fri, 20 Aug 2010 22:39:57 -0600

I am a new user of abaqus

in my task I've got case of dynamic analysis in rubber component just like boot or absorber in car. I want the product result in my simulation, views the cycles of that component of my simulation untill it's failure..

List of electronics circuit simulators and analysis software tool?

Fri, 20 Aug 2010 05:24:48 -0600

List of electronics circuit simulators and analysis software tool?
Could any one list few latest most common electronics circuit simulators and analysis software tool
besides PSPICE, CIRCUITMAKER and MULTISIM?

If possible, can anyone suggest me a site where I could compare their pros and cons of these simulators and software?

ABAQUS Web Course: Classical Fracture and Failure with Abaqus

Tue, 10 Aug 2010 10:43:08 -0600

When : Tuesday, August 24 – 8:30 a.m. - 5:00 p.m., PDT
Wednesday, August 25 – 8:30 a.m. - 5:00 p.m., PDT
Deadline to register: August 17, 2010; an additional fee of $50 will be applied after this date.

Quote:Take advantage of this web-based course on "Classical Fracture and Failure with Abaqus" right from your desk — no productivity loss due to travel and no travel expenses. The lecture content of this web-based course is conveniently scheduled over two morning sessions. The course workshops can be completed during the afternoons at your convenience, while support engineers from SIMULIA West are available by phone to help you.
Objective:
You will learn the necessary techniques and strategies used for evaluating a structure with an existing flaw. In addition, an introduction to the damage based cohesive elements and surfaces will be given for those interested in advancing from classical fracture mechanics to crack propagation studies.
Topics that will be covered include:
* Classical fracture mechanics primer
* 2D and 3D crack modeling techniques
* 2D and 3D meshing strategies
* Specifying the singularity at the crack tip
* Stress intensity factors
* Contour integrals
* Fracture specific output requests
* Overview of damage framework and cohesive technology
* Stabilization techniques related to cohesive behavior
* Damage specific output requests related to cohesive behavior

Howto:Rdesktop & VPN. Linux->Windows

Sat, 17 Jul 2010 09:07:16 -0600

Remote desktop to Windows machine from linux using rdesktop and VPN.

How to connect to the windows network (work/office) from your linux box (e.g., ubuntu) using vpn and rdesktop.

I will give you the generic commands to install, for which I assume that the system is debian based.

Install VPN:

We will use VPNC , which is an open source free alternative that is compatible to Cisco VPN.
As root,

Code:

apt-get install vpnc resolvconf

Install Rdesktop

Code:

apt-get install rdesktop

Need details from the Cisco VPN pcf files issued from your work/school
Create a file school.conf and paste

Code:

IPSec gateway 

IPSec ID 

IPSec secret 

Xauth username

Move this file to /etc/vpnc and start vpnc by:
In a terminal as root:

Code:

vpnc school (without the extension .conf)

Enter your password at the prompt. You should get a message saying that the connection has been started in the background.

Now time to connect to your [office/school] windows system
start rdesktop: (not as root)

Code:

rdesktop -u YourUsername xxx.xxx.xxx.xxx

where xxx.xxx.xxx.xxx is the ip address of the computer

You should see the login window with a basic 16bit display. More options as available in rdesktop to obtain more control over the display. Make sure to disable dual monitor setup on this computer prior to connecting (if using the above command to connect. you will not be able to change settings from this basic window.)
Just use this command to get the options.

Code:

rdesktop

That's it. Hope this is useful.

CAE - Computer Aided Engineering - first time the term appears

Tue, 29 Jun 2010 08:43:31 -0600

Hi Folks,
Some one knows when was the first time the term CAE meaning Computer Aided Engineering appears in books or papers? The oldest reference I´ve found using Google Books was page 128 of American Society Engineering Education Review of 1966. Some one knows an older one?
Thanks.

iphone iOS4 upgrade and voicemail password

Thu, 24 Jun 2010 08:28:19 -0600

I just realized that you will be asked for a voice mail password if you have upgraded to the new version of the iphone operating system-iOS 4.

Just call 611 and select options in this order:
1, 3, 3- to reset the password and enter the billing zip code. They will send you the password in a text message. Then go to the voice mail screen and enter the information.

That's easy.

Alternatively, you can just hold '1' in the keypad and access your voice mail like in any other phone. With all the instruction messages and all.

ESI North America: FREE basic Visual-Crash training classes...

Thu, 17 Jun 2010 14:32:07 -0600

Quote:ESI North America is pleased to announce that we are offering FREE basic Visual-Crash training classes in July 2010!
What:
July 7th 2010: Visual-Crash DYNA 6.1 Training Class
July 8th 2010: Visual-Safe MAD 6.1 Training Class
July 9th 2010: Visual-Viewer 6.1 Training Class

Where:
ESI North America, 32605 W. 12Mile Rd, Suite 350, Farmington Hills, MI 48334.

This course is intended to convey basic usage concepts and will include both lecture and hands-on lab work.
For additional information or to register, please call or email us:
Phone: (248) 381-8040
E-mail: training@esi-group-na.com

16th US National Congress on Theoretical and Applied Mechanics (USNCTAM)

Mon, 14 Jun 2010 08:54:52 -0600

Quote:The US National Committee on Theoretical and Applied Mechanics is sponsoring the 16th US National Congress on Theoretical and Applied Mechanics (USNCTAM) on June 27 - July 2, 2010 at the Pennsylvania State University in University Park, PA. The Congress, held every four years, is the premier American forum for networking and technical information exchange for researchers and students interested in mechanics. The Congress agenda consists of a welcome reception, plenary sessions, five days of up to 18 parallel technical sessions, lunches, and a banquet. Technical sessions will cover numerous topics on solid mechanics, fluid mechanics, dynamics, and bio-mechanics. Up to 1000 papers by colleagues from the United States and abroad are expected.

On behalf of the US National Committee on Theoretical and Applied Mechanics and the local organizing committee, we extend a warm welcome to all mechanics researchers to join us in the picturesque ridge-valley region of Central Pennsylvania.

AGENDA PDF

It's not a tablet or a book reader. It's a new species, and we call it ADAM...

Sat, 12 Jun 2010 20:12:04 -0600

Check out this new toy!

Quote:The Notion Ink Tablet will feature the Pixel Qi transflective display, and it will have a 10.1 inch screen with a resolution of 1024 x 600, and it measures 6.2 inches by 9.4 inches by 0.5 inches thick and weighs in at 1.35 lbs.

Key Features

Quote:

10 inch transflective LCD

180 degree Swivel Camera

Dual-Core ARM® CORTEX-A9 MPCORE™ Processor

Full High Definition Multimedia

Longer Battery Life

Dual Display

Ebook Client

3G and WiFi Connectivity

Multi-touch Support.

Webinar: Abaqus 6.10 for Unified FEA

Thu, 10 Jun 2010 10:38:38 -0600

Thursday, June 24 – 4 p.m. EDT
Thursday, July 1 – 9 a.m. EDT

Join us for this one-hour webinar to learn about the latest enhancements made to Abaqus 6.10.
Key features to be discussed include:
Multiphysics
* Interface for CFD modeling, execution, and visualization in Abaqus/CAE.
* Coupling with Abaqus/Standard or Abaqus/Explicit for Fluid-Structure Interaction and Conjugate Heat Transfer; Incompressible (transient or steady flows); Turbulence modeling.
Mechanics
* Enhanced modeling of fracture of composite materials with XFEM.
* A new iterative equation solver offers significant performance enhancements for simulations involving large blocky structures, such as oil reservoirs, engines.
* A new model for capturing high-rate impact of ceramics and other brittle materials, based on the well-accepted Johnson-Holmquist formulation.
* Dynamic load balancing of compute resources improves performance of domain decomposition parallel processing.
Modeling and Meshing
* Expanded set of geometry edit tools for creating midsurface representations of thin solid parts for more efficient simulations.
* General 3D sweep capability for creating complex, curved geometric features, including solid, shell, or cut geometric features such as exhaust manifolds of engines or window frames in aerospace structures.
* Several meshing improvements for quality and robustness of surface and tet meshing.
* Improved interface for controlling local mesh gradation and density with enhance usability and additional controls including double-biased seeding option.

Usability and Visualization
* Part or assembly based view cuts capability for both meshes and geometry allow interior of models to be visualized which makes it easier to position assembly components and assign attributes.

Cannot Start Maxima Error. Windows 7

Tue, 08 Jun 2010 16:58:29 -0600

I was getting "Cannot Start Maxima Error" in Windows 7 64b version. I installed WxMaxima 5.21.1 from here

The problem was solved by uninstalling the Zone Alarm firewall I had. Removing maxima from the zone alarm program did not help.

The Ubuntu version is working great. Just an info in case anyone ran into this.

New iPhone unveiled !!! iPhone 4

Mon, 07 Jun 2010 15:23:38 -0600

Live blog: Steve Jobs at Apple's WWDC 2010]: Read the live blog

Quote:The rumors are true: iPhone 4 is real and it's coming on June 24. Steve Jobs has just wrapped up his announcement of the 4th generation of the wildly popular iPhone on stage at Apple’s World Wide Developers Conference in San Francisco, California, along with countless other surprises.

How to add fonts for remote GUI mathematica access

Mon, 07 Jun 2010 08:48:54 -0600

Penn State HPC Group has everything written down nicely for us.

Quote:Mathematica requires its own fonts in order to display content correctly. If you are running Mathematica remotely, using an X-server, you will need to install these fonts on your local machine and tell Mathematica where to find them.

Here is the link

Copy & pasted for reference:
Installing Mathematica Fonts in Linux (with root access)
1. First you will need to download Mathematica fonts archive. [search]
2. Untar the Archive to some directory. Make sure X windows is running, and issue the following commands using your favorite terminal program, making sure you are logged in as an administrator:

Code:

mkdir -p /usr/local/mathematica/fonts

mv mathematica-fonts.tgz /usr/local/mathematica/fonts

cd /usr/local/mathematica/fonts

tar -xzvf mathematica-fonts.tgz

rm -f mathematica-fonts.tgz

3. Rebuild the fonts.dir files. Using the same terminal as in the previous step, issue the following commands:

Code:

mkfontdir /usr/local/mathematica/fonts/BDF

mkfontdir /usr/local/mathematica/fonts/Type1

4. Log in to Hammer and run Mathematica, telling Mathematica where to find the fonts:

Code:

ssh -Y @server

mLinux.sh

Latex error

Sat, 05 Jun 2010 19:33:23 -0600

i am using texmaker in ubuntu and i get this error

Code:

! Font OT1/ptm/m/n/12=ptmr7t at 12.0pt not loadable: Metric (TFM) file not foun

what to do? thanks

Octave as a Matlab replacement

Fri, 04 Jun 2010 22:28:51 -0600

I have been using Octave as a matlab-replacement lately. So far I am happy with Octave and I thought I would share these info.
You can get Octave from here or from Octave-forge

Yea...
1. It's free.
2. Can easily be combined with gnuplot. Though not as powerful as Matlab.
3. 95% of code compatibility. All my user defined functions work. Never worked with Simulink. So I could not vouch for that.

Matlab like GUIs (IDEs)
1. Xoctave
2. OctaveNB. (Java based)
3. Qtoctave is a nice IDE for Octave.
4. Octavede

Additional info:
1. A good 2D graphic system for Octave is OctPlot
2. If you want 3D visualization, then there is Octaviz
3. Try it out online. Interesting.
4. If you do not like GNUPlot, then try PLplot

Scilab is also a good tool. Not forgetting computational plug-ins from Python. Worthy of a different thread.

What do you think?

Autodesk and AIAS 2010 Student Sustainable Design Challenge

Fri, 04 Jun 2010 22:07:52 -0600

People's Choice voting is now open! Log in and cast your vote.

Quote:Autodesk and AIAS 2010 Student Sustainable Design Challenge

Submissions are closed and voting has begun for the Autodesk and AIAS 2010 Student Sustainable Design Challenge. Cast your vote for the People’s Choice category today!

AIAS and Autodesk have challenged students from around the world to create designs for small single-room schools that can be constructed across Port-au-Prince, Haiti, with limited materials and minimal construction experience. Visit the Autodesk Education Community to review the submissions and vote for your favorite.

Voting will be closed on June 11, 2010, at 5:00 p.m., Eastern Time so make sure you pick your favorite before time is up. The winners will be announced on June 12 on the Autodesk Education Community as well as at the AIAS Student Lounge and Gallery at the AIA Convention in Miami.

Maxima encountered a Lisp error. What to do?

Fri, 04 Jun 2010 11:26:56 -0600

I get this error when performing a symbolic matrix inversion.

Quote:Maxima encountered a Lisp error:
Error in PROGN [or a callee]: The storage for CONS is exhausted.
Currently, 94099 pages are allocated.
Use ALLOCATE to expand the space.
Automatically continuing.
To enable the Lisp debugger set *debugger-hook* to nil.

I could not find a way to resolve this. Any help would be great. Thanks.

A new forum for students and job seekers

Wed, 02 Jun 2010 20:46:01 -0600

We've started a new forum for students, graduates, and those who are already in a career path.
Check it out. We would like to hear from you.

Are you a student? Undergrad/Grad?
Are you a fresh graduate?
Are you currently working?

Whoever you are, there are stories to tell. So please do. Help us out. What are your experiences?
Please feel free to start topics. It's a very open forum. We are hoping that this would benefit a lot.
Thank you

Any grad students ?

Wed, 02 Jun 2010 20:40:35 -0600

We are a couple of grad students. Are you a grad student?
Do you like grad school? Painful?

Is it worth it?