cosin software 2024-3 release notes

General cosin software aspects

1. fix: call to emacs in MacOS
2. general fully nonlinear spokes stiffness model implemented
3. made sure an error message is issued in any case of missing license

cosin graphical user interface (GUI)

1. fix: display of parameters in FTire/sim and cosin/mbs-GUIs
2. spokes pre-processor and analyser integrated in GUI

FTire/core

1. fix: error message in case of non-optimal preprocessing
2. fix: tire surface coloring in case physical variable assigned to color gets negative
3. fix: lateral to longitudinal tread stiffness ratio fixed; had been falsely inverted (only) in previous version 2024-2
4. fix: potentially inaccurate rim width output value fixed
5. fix: potential instability of air cavity model for very small internal time steps, by introducing a low-pass differentiation filter for segment interface area rate of change computation
6. fix: signs of output signals ‚velocity (C-axis)‘ and ‚velocity (W-axis)‘ when rolling on drum, to match signs of wheel angular velocity
7. new FTire numeric parameter ‚rel_time_const_belt_lat_bend‘ introduced
8. new output signal ‚turn slip‘ added
9. newly introduced numerics item ‚rel_time_const_belt_lat_bend‘ = ‚relative time constant lateral belt bending build-up‘ can result in more accurate contact pressure distribution at very high rolling speeds
10. optional lug-adapted placement of contact elements introduced
11. preprocessing of modal damping for NPT tires with less spokes than segments implemented and tested
12. improved lug sidewall contact computation

FTire/sim

1. fix: : duplicate cosin/ip signals removed

FTire/fit

1. fix: creation of reference plots for all validation cases
2. fix: computation of drum surface velocity output signal, used in rolling circumference fitting
3. fix: GUI error when switching between steady-state identification objectives if score values are avaialble
4. fix: zoom in/out function for first image
5. fix: occasional issue with footprint „what if“ call
6. fix: slider labels in interactive simulation
7. report formating improved
8. improved check for measurement validity
9. made sure previously generated reference data are not overwritten if report with speed mode comparison is generated
10. new extended ‚validate all‘ function, adding all results for FTire in RT mode
11. results with other speed mode made available as reference plots
12. lateral ribs as new simple geometrical tread pattern introduced

FTire/link

1. fix: plot signal selection fixed
2. menus in blockset partially rearranged
3. made more than 1 multi-threaded block in one Simulink model work
4. made sure message and animation windows can be activated independently

FTire/hilac

1. added support for SimWB 2023.1, 2023.2, and 2024.1

cosin/road

1. fix: several minor issuess in full 3D evaluation of triangulated surface
2. made cosin binary triangulation file (trb file) available as road data file
3. made sure Adams-only road data format ARC903 is recognised and evaluated properly

cosin/mbs

1. new cosin/mbs stiff elements ‚fix joint‘ and ‚unilateral contact‘

cosin/tools

1. ‚for‘ loop and ‚if/else/end‘ blocks added to cosin/io-formatted data files
2. new functions ceil, frac, peri in arithmetic expressions
3. improved function plotter
4. new menu showing simultaneously all cosin/io parameters of up to 4 files in cosin/io format w/o underlying application

cosin/tools for roads

1. PSD optionally computed along curvilinear coordinates rather than global coordinates (coordinate system selectable in PSD GUI)

cosin/tools for tires

1. fix: potential crash in fingerprint computation when comparing two different speed modes
2. fix: some data selectable for second inflation pressure might not have been shown in cosin/tools for tires edit menu
3. improved computation of vertical deflection in statics analysis
4. ’show‘ button for cross section splines in geometry pane made visible after creation of spline using button ‚create splines‘
5. improved error handling in cornering stiffness characteristics computation
6. made cornering stiffness and pneumatic trail in fingerprints comparable to tire with different speed mode
7. made sure cover sheet image in reports is not influenced by previous simulation settings in same program run
8. made sure fingerprint comparison uses correct speed modes if reference speed mode is smaller than original one
9. made sure fingerprint comparisons to RT speed mode works if HiL license is given
10. made sure report cover sheet can be created even if animation is not possible in current environment
11. more accurate estimation of vertical tire deflection for statics analysis if wheel load is given and radial stiffness characteristic is degressive
12. new button ‚portrait image‘ in tools for tires, creating a nice tire model portrait (png) with one click
13. removed superfluous high_precision_tang_plane_RT option listed when standard execution is selected
14. new report cover sheet layout
15. lateral ribs as new simple geometrical tread pattern documented and integrated in GUI

cosin/tools for Matlab

1. improved air cavity model diagnosis tools for Matlab

CTI (cosin tire interface)

1. accelerated evaluation of operating conditions in case of very small step sizes set by solver
2. new CTI API function ctiGetTireDataHeader

Installation

1. add new pass_car_225_40R18_92Y tire file and tire variations to installer

Documentation

1. road and CTI documentation chapters revised
2. automated search function added for MacOS Preview
3. documentation chapter selection made work for all pdf viewers
4. pdf viewer selection improved