{"id":456,"date":"2018-02-28T03:48:35","date_gmt":"2018-02-28T03:48:35","guid":{"rendered":"https:\/\/blogs.mathworks.com\/student-lounge\/?p=456"},"modified":"2018-03-07T09:06:03","modified_gmt":"2018-03-07T09:06:03","slug":"vehicle-modeling-simscape-language","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/student-lounge\/2018\/02\/28\/vehicle-modeling-simscape-language\/","title":{"rendered":"Custom Vehicle Modeling using Simscape Language"},"content":{"rendered":"

Today, I am happy to introduce\u00a0Andrea Casadio<\/a>, he is a junior mechanical engineer and first-time guest in this blog. Andrea is going to describe his thesis work at\u00a0Politecnico di Torino<\/a>\u00a0in which he developed Simscape\u2122 libraries for vehicle modeling. <\/p>\n

Thank you Andrea for providing the community with your work on MATLAB Central FileExchange<\/a><\/strong>.<\/p>\n

– –<\/p>\n

When I studied vehicle dynamics at university, I spent a lot of time modeling in Simulink\u00ae<\/sup>. What I did in fact was creating models based on fundamental equations trying to mimic actual systems. This approach became increasingly\u00a0time consuming when I used more advanced system modeling approaches. Ultimately, I spent more time building vehicle models instead of developing and optimizing simulations.<\/p>\n

At this point, I discovered Simscape. Simscape allows me to speed-up creating models of physical systems within the Simulink\u00a0environment. Simscape blocks typically provide the functionality of a system of Simulink blocks within a single block.<\/p>\n

Anyway, describing pros and cons of Simscape is not the scope of this post. So, let\u2019s go with the work illustration!<\/p>\n

At the beginning of my project, I discovered that default\u00a0blocks of the Simscape Driveline library allow the simulation of longitudinal behavior only. The reason is that the tire blocks provided are based on mathematical models that take into account the longitudinal forces exchanged between tire and road. As expected, MathWorks offers functionality that allows to create custom components<\/a>\u00a0using the Simscape language.<\/strong><\/p>\n

For the reason above, the first target was to develop customized tire blocks based on more involved mathematical models like Pacejka \u201989 and \u201996, taking into account also the combination between lateral and longitudinal forces.<\/p>\n

<\/a><\/p>\n

Fig. 1 –\u00a0Example of a customized tire block<\/p>\n

Lateral and longitudinal forces are functions of lateral and longitudinal tire slip, which depend on translational and rotational speed of the wheel. To develop such kinds of blocks it was necessary to use Simscape language to define:<\/p>\n