What is Swumsuit?

By using Swumsuit, the user can perform all tasks during the analysis with easy GUI (Graphical User Interface) operation, such as editing input data, starting analysis, displaying many quantities of the results with graphs and animation, without being conscious of inside the difficult simulation program.

Due to this advantage, Swumsuit enables everyone to perform simulation of the human swimming, which has been thought to be difficult because of complicated formulation for body motion and fluid force.

Swumsuit is a Free Software distributed under GPL (Gnu General Public License).

By Whom?

Screenshot

Required Environment

Download Swumsuit

Please see below manual for installation.

Download Manual

Download Sample Projects

Analysis example of standard six beat front crawl (3.3MB)

Analysis example of breast stroke (1.2MB)

Analysis example of backstroke (1.2MB)

Analysis example of butterfly stroke (1.1MB)

For determining body geometry (2KB)

Old files

Contact

Revision History

Changed:

• [Bug fix] Bugs related to the new formulation introduced from 8.0.0 were fixed.

Changed:

• [Bug fix] A bug in animation display for multi project mode was fixed.

Changed:

• [Bug fix] Instability in the multi project mode was solved.

Changed:

• [Bug fix] A bug related to the new formulation introduced from 8.0.0 was fixed.

Changed:

• [New function] A new formulation with respect to the equation of motion for rotational movement of the human body was implemented. In the formulation so far, the time integration was conducted in the coordinate system of principal axes of inertia, which were calculated for the whole human body. In the new formulation, the principal axes of inertia are not used, and the time integration is conducted in the human body reference coordinate system. If this formulation is used, the calculation error, which rarely occurred in the situation that the directions of principal axes of inertia changed rapidly against the human body reference cordinate system, never occur. However, since the calculation result might slightly change in this case, the previous formulation still can be selected as an option as well. In the selecting line of "Edit Analysis Settings" "Calculation settings" "Consider conservation of angular momentum strictly", the new formulation is used if "2" is selected. The options "0" and "1" correspond to the previous formulation. The option "0" corresponds to the initial version which does not have the correction of angular momentum. The option "1" corresponds to the version updated in 4.2.0 which has the correction.

Changed:

• [Bug fix] A minor bug was fixed.

Changed:

• [Bug fix] A minor bug was fixed.

Changed:

• [New function] On editing body geometry, it became possible to import image files and configure graphically.
• [New function] The analysis engine file became the one for 64bit OS. If you use 32bit OS, please copy "SWUM_ENGINE_WINDOWS_32bit.EXE" file in the "Engine" folder to "SWUM_ENGINE_WINDOWS.EXE."

Changed:

• [Bug fix] Several bugs were fixed.

Changed:

• [Bug fix] Several bugs were fixed.

Changed:

• [New function] Finally digitizing was enabled in Swumsuit! You can digitize the image on the image import screen. The strong "auto adjust" function was realized as well.

Changed:

• [New function] In the image import screen, it was enabled to edit body geometry. It will be possible to determine the body geometry effectively if you use this function together with the sample project folder for determining body geometry.
• [Bug fix] A bug in displaying a figure in the editing body geometry window was fixed.

Changed:

• [Bug fix] A bug in displaying animation in the case of multi-project mode was fixed.

Changed:

• [New function] In the image import screen, it was enabled to copy the settings to the next time frame.

Changed:

• [Bug fix] Several bugs were fixed.

Changed:

• [New function] It became possible to apply the results of edition to the other distal segments in the joint motion editor.
• [Changed] Fonts in the English version became more readable.

Changed:

• [New function] It became possible to import images in the joint motion editor.

Changed:

• [Changed] The calculation method in the case of "consider conservation of angular momentum strictly" has been improved.

Changed:

• [Bug fix] There was a bug in the new function below. (The x coordinate was not output correctly.) This bug has been fixed.

Changed:

• [New function] In the Animation window, the center of gravity, center of buoyancy, and principal axes of innertia can be displayed. The blue point is the center of gravity while the red is the center of the buoyancy.

Changed:

• [Bug fix] Some minor bugs have been fixed.

Changed:

• [Changed] Changed the coordinate system of the external moment in the multi project mode into the absolute coordinate system.

Changed:

• [Bug fix] Some minor bugs in the Windows version have been fixed.

Changed:

• [Bug fix] Version 4.0.1 also had a serious bug which causes wrong calculation results in a certain situation. If you use the version 4.0.1, please update to this version 4.0.2.

Changed:

• [Bug fix] Version 4.0.0 had a serious bug which causes wrong calculation results in a certain situation. If you use the version 4.0.0, please update to this version 4.0.1. (Thank you, Kiran !)

Changed:

• [New function] Swumsuit now supports "multi-project mode". What the multi-project mode is will be presented at the International Conference on Computer Simulation in Biomechanics (ISCSB 2009).
• [Bug fix] Fixed some minor bugs.

Changed:

• [New function] Finally, Swumsuit runs on Macintosh! Successful running has been confirmed on MacOS X 10.4(Tiger). It runs on Xdarwin. How to install and invoke is the same as on Linux.

Changed:

• [Bug fix] Fixed some bugs including SERIOUS one. PLEASE UPDATE IMMEDIATELY if you are using version 3.0.0. This serious bug might cause memory allocation problem, resulting in wrong calculation results.

Changed:

• [New function] Enable to output files for the musculoskeletal analysis software "AnyBody Modeling System". Due to this function, the user can conduct the musculoskeletal simulation for swimming. Please wait updating the manual for the details of this function.
• [Bug fix] Fixed some minor bugs.

Changed:

• [Bug fix] Corrected computing method of joint torque due to inertial force.
• [Bug fix] Corrected computing method of acceleration in the case of "given motion".
• [Bug fix] Fixed some other minor bugs.
• [New function] Enable to display text data for each graph.
• [New function] Enable to display xb,yb,zb axes in the figure of body geometry editing window.
• [Changed] Changed expression with respect to Propulsive Efficiency (Power Efficiency) and Power to be understood more easily.

2005/12/6 version 2.2.0 release

Changed:

• [New function] Zooming function on the animation window has been added. You can change the magnification by dragging the mouse with pressing Shift key and left mouse button. You can also change the magnification by entering the value in the column.

Changed:

• [New function] Penetration judging function has been added. (Details will be on updated manual, please wait for a while...)
• [Bug fix] Fixed some minor bugs.

Changed:

• [New function] Optimizing function has been added. It enables you to optimize the body geometry and joint motion on Swumsuit itself.

Changed:

• [New function] Enable to synchronize the animation with graphs.
• [Changed] The analysis engine for Linux was compiled by Intel compiler.
• [Bug fix] Fixed some minor bugs.

Changed:

• [New fucntion] Enable to give whole body motion as rigid body without solving equations of motion.
• [New function] Enable to change frame number of joint motion.
• [Changed] The location of local script now becomes upper folder.
• [Changed] Newline characters for all input files now become Unix type.
• [Bug fix] In some case, the ``Output_data'' folder could not be deleted.

Changed:

• [New fucntion] Enable to output BMP, GIF, JPEG or MPEG file of animation results. To use this function, you have to install ImageMagick and Ghostscript .
• [New function] Enable to give motion of lower waist when editing joint motion.

Changed:

• [New fucntion] Enable to open easily project folder which has been opened before.
• [New function] Enable to move up and down by arrow keys when you input joint angle values on Edit Joint Motion Window.

Changed:

• [New fucntion] Enable to configure fluid force coefficeints for each part of the body.
• [Bug fix] could not create new joint motion.
• [Bug fix] display for joint motion was wrong when rotation of lower hip was added.

hits since 2011/9/1