Updates to Engineering Vibration Toolbox since 1/1/98 Date code/s change --------------------------------------------------------------------- 04/25/08 vtbchk New code called at the end of each function to provide automated update checking. Function is run at the termination of all major functions. vtb3_1 Corrected aliasing issue reported by Pappa, added settling time marks. 04/15/08 vtb1_4 Added to the help 02/22/08 vtb6_3 Free-free conditions were missing one mode 02/20/08 vtb6_3 Simply supported modes were broken 02/20/08 vtb6_5 Boundary condition type wasn't being used 11/23/07 vtb3_5 Improved to more easily handle even/odd differences 09/02/07 vtb6_3 Didn't plot modes correctly 08/29/07 vtb6_5 New code, generates FRF for beam 07/20/07 vtb6_3 Added rigid body modes vtb6_3 Added animations vtb6_3 Changed input format vtb6_3 Mass normalized mode shapes 06/25/07 vtb1_3 Corrected description of vtb1_3 11/20/06 vtb4_1 Corrected reported wrong modes 11/17/06 vtb3_5 Added: Plot Fourier series 11/10/06 vtbud Improved vtbud so false updates won't be reported. 11/10/06 vtbud Fixed unix installation to avoid repeatedly adding path to startup.m file. 10/24/06 vtb1_3 Attempts to automatically correct for bad step size choices. 10/23/06 vtb Improved help. 10/23/06 vtbud Fix bugs, error checking. 10/21/06 vtb1_3 Only for single degree of freedom systems. Doesn't require editing separate file. 10/20/06 vtbud Now can install and/or update the toolbox. 06/12/06 vtb4_1 Incorporated Cholesky Decomposition 09/14/05 vtb3_3 I got an error regarding using i as a variable. Fixed now. 05/15/01 vtb3 Changed help for vtb3_3 05/15/01 vtb3_3 Fixed vtb3_3 when n is not given by user. 01/01/01 vtb1_2 Changed the word undamped to unforced in the help 11/26/00 vtbud Changed URL for vtbud. Created vtbud.txt to log changes 10/30/00 vtb8_1 Fixed no longer available 'i' plot type. vtb8_3 Fixed no longer available 'i' plot type. vtb8 Updated documentation file name. 07/24/00 vtb1_3 Corrected help (vtb9_3 -> vtb1_3) and spelling error 05/09/00 vtb7_4 Curve fitting is much more robust, much less likely to fail. 04/28/00 vtb2_3 Corrected phase plot 04/28/00 numerous Replaced greek names with greek characters and made subscripts show up properly 04/24/00 vtb2_4 Added plotting options. 04/24/00 vtb2_3 Added plotting options. 04/21/00 vtb2_3 Added legend & default values 04/21/00 vtb2_4 Added default values 04/20/00 vtb2_4 Now allows a list of values of zeta 03/21/00 vtb1_5 Calls the old vtb2_6. vtb2_6 has been grandfathered. vtb1_2 Is the old vtb9_2. vtb9_2 has been grandfathered. vtb1_3 Is the old vtb9_3. vtb9_3 has been grandfathered. vtb1_3ex Is the old vtb9_3ex. vtb9_3ex has been grandfathered. vtb1_4 Is the old vtb9_4. vtb9_4 has been grandfathered. vtb4_3 Is the old vtb9_1. vtb9_1 has been grandfathered 02/29/00 vtb3_3 Can now run with no arguments. 02/28/00 vtb2_3 Can now take a list of values for zeta. 02/04/00 vtb7 Added references to vtb7_4 and vtb7_5 01/13/00 numerous Removed GUI buttons for printing since recent version of Matlab enable such GUI capabilities on all platforms. Also, removed a number of figure commands. This will allow the user to invoke the hold command and plot multiple graphics on a single figure. 01/13/00 readme.txt Updated version of toolbox to 5 to represent Contents.m dropping of support for version 4 of Matlab in future releases. 11/08/99 vtb7_4 Improved robustness of curve fitting with the addition of a few checks. Note: This code does not fit simultaneous FRFs. Thus the results for MDOF systems can vary. 10/07/99 vtb7_4 Added. Now FRF curve fitting can be performed to ID damping, natural frequencies, and even mode shapes. There is enough there to perform a complete modal analysis. 10/07/99 vtb7_5 Added. Now FRFs of computational models can be obtained, viewed, or used in vtb7_4. Includes receptance, mobility, and inertance, along with output of the corresponding frequency vector. 11/20/98 readme.txt Updated to clarify installation instructions 11/11/98 vtbud Modified URL for web page to use shorter (~) link. 11/11/98 vtb3_3 Modified example to match default function (Example 3.3.1, T=1) 04/03/98 vtbud Running vtbud automatically displays the most recent vtb updates in your web browser 04/03/98 vtb,vtoolbox Added error response when called without help 03/30/98 Contents Added reference to web page 03/30/98 Readme Corrected reference to new web page 03/30/98 vtb Added reference to web page 03/17/98 vtb4_2 Incorrect matrix exponential fixed Run vtbud to compare your version to the most current one. More information is available at the Engineering Vibration Toolbox website: http://www.cs.wright.edu/~vtoolbox