Are the grayed-out tire parameter fields in the "Combined Slip Wheel 2DOF" block closed-source, and if not, how can they be accessed?

Hello,

I was looking into the block "Combined Slip Wheel 2DOF" and I noticed that selecting predefined models like "Light passenger car 205/60R15" or "Mid-size passenger car 235/45R18" results in most tire parameter fields being grayed out, with only a few editable unless the "load from external file" option is selected. Are these fields grayed out because the models are closed-source, and the parameter values are not publicly accessible? If they are publicly available, is there a way to access these values?

Answer 1

[Manish]

Hi Kenneth,

I understand that you want to access the grayed-out tire parameters for the 'Combined Slip Wheel 2DOF' block.

This can be achived by the following steps:

1. Save the model with specific model name.
2. Create a variable in MATLAB and store the block path.
3. Use the 'get_params' function,specifying the block path and attribute.

Here is the sample code:

%blockPath='your_model_name/your_block_name'
blockPath = 'car/Combined Slip Wheel 2DOF'; % my_model_name=car
%Parameter_value = get_param(blockPath, 'attribute_name')
Parameter_value=get_param(blockPath, 'LONGITUDINAL_STIFFNESS');

The grayed-out parameters have different attributes. For example, the 'Structural' category includes the 'LONGITUDINAL_STIFFNESS' attribute. These attributes are used in the code and can be found on the documentation page.

Refer the below documentation links for better understanding:

https://www.mathworks.com/help/vdynblks/ref/combinedslipwheel2dof.html

https://www.mathworks.com/help/simulink/slref/set_param.html

Hope it helps!