Please find below an email from Sarba Guha from the LSTC Dummy Modeling Team concerning the “Standing Dummy Model”.
Hello Dyna Dummy Users Worldwide:
This mail pertains to the Standing Dummy Model sent out on Monday, 4th January, 2010. I have prepared a model containing a “Small Car Hitting the Standing Dummy Sideways”. Please download it using the following Link:
Our Date Naming Convention has now become yy/mm/dd. In the Dummy Name “10” is for the year 2010, “01” is for January and “05” is the day. This model is for demonstration purposes only and has no reality to it. It has been prepared to serve purely as a Learning Aid.
The following are the salient points to note:
- Please unzip it in a separate directory. You will find the following contents:
- To run the job, just submit the file “dyna.SubmitMeToRunJob.k” . The Car and the Dummy Files are “included” in it.
- The original Standing Dummy has been “positioned” for this model and its IDs Offset by 2-Million (2000000).
- The Car Model was downloaded from the NCAC & GWU website. For those who are not aware, the following is the link to their greatly useful and informative public domain website: http://www.ncac.gwu.edu/vml/models.html There are many models that have been built over the years and kept there for general purpose usage. It is an invaluable resource site to be aware of. We would all like to thank NCAC & GWU for this this enormous service rendered to the worldwide community free of charge.
- The Car Model I downloaded has only 16,100 Elements. Date Posted: Year 2000, October 21 It turned out ideal for my demonstration purpose in this case.
- I had to make small adjustments to the original to run Time-0. After that I ran “Unit Transformation” to change their Units of “mm, tonnes, seconds and N” to our preferred units of “mm, kg, ms and kN”. I applied an arbitrary uniform Velocity of 13.6 mm/msec or about 30-mph. Other minor modifications to parts of the structure were made to suit my purpose.
- Please read the README file for some useful information.
- Please read the Header Notes contained within these files.
- In the Car Model, in addition to the Header Notes, please read the notes that I have written just above the “*INITIAL_VELOCITY” card. Please pay special attention to what I have used for “NSID” and “IRIGID” in the Velocity Card. I wish to write a separate mail, explaining the different usages of IRIGID for this kind of model. In that I will write about how the same end-result can be obtained by using different methods and also, what will work and what will not work. I believe this is very important for everyone to understand.
- You can view the two “avi” files that I have given to get a quick glimpse of what to expect if you run the model. I have defined the Ankles with Spherical Joints for better rotation for a Sideways Hit. I have attached a “close-up avi” to show how the feet respond to this kind of hit. In the near future, I would like to define the Ankles of the “5th/50th/95th% H-III Rigid-FE Dummy Models” with Spherical Joints also, for all purpose response. The fact that they are defined via Revolute Joints now creates “somewhat of a constraint” in the most general case of loading, though they do serve the purpose well enough in most cases that we encounter daily for the H-III. The Standing Dummy Model has extra contacts defined between the various limbs, just to take into account the sideways hit. Please load the Dummy Model separately in LSPP and step through the contact definitions one by one to see what I have done.
- Please note that I do not know any of the details of the Car Model. I just used it for my purpose. Any specific questions about the model itself, may please be directed to the people named on their website.
Please try to learn as much as you can from this combination model. You can then easily replace my car model with any other specially designed car, barrier or object, to strike the dummy in your particular mode of analysis.
Please be on the lookout for one more mail explaining Point (9) in the notes above.