A month ago I saw a news article about the re-discovered remains of an experimental aircraft catapult that was unearthed just outside oxford. As I read I thought it would be an interesting combination of realms of simulation that we could easily model and set myself a challenge to...
Tag Archive for: VeSyMA – Suspensions
If you are modelling complex systems, such as full vehicle models, then you will have seen that they can include large transient periods at the start of simulation, before settling to a steady state. Colloquially this is known as the “settling phase”. Excessive settling in a model can cause...
The Suspensions library is full of experiments that test the full vehicle dynamics. However, it can be very difficult to validate models using full vehicle experiments, such as the common Kinematic and Compliance (KnC) test. This kind of test, as the name suggests, details the suspension kinematics (force and...
A couple of weeks ago, I wrote a blog post about creating a simple multibody system model of an active ballast system, found on the Mercedes-Benz DTM/ITC car from the mid-1990s. It was not the only highly innovative technical development found on the DTM/ITC machines of that era. Constant...
Evolving out of the ferociously popular German DTM series in the mid 1990s, the International Touring Car Championship (ITC) featured exotic and sophisticated racing cars; certainly, the most advanced production-based racing cars ever seen. Ballooning budgets from 3 large European manufacturers: Mercedes-Benz, Opel and Alfa Romeo, allied to a...
We recently conducted a technical investigation into the systems modelling approach to train simulation. This blog post will cover what was created and outline the capabilities and next steps that it could be expanded upon. Basis of the library We used the VeSyMA library as a base, this provided...
The Claytex team was posed a question recently; “How easy would it be to create an articulated truck model with what we’ve got already?” My immediate thought was that it should be easy. The dynamics are no different from a conventional car and trailer and apart from a couple...
The majority of vehicle simulations are for vehicles in optimal or close to optimal conditions. However, evaluating the vehicle which is in a worn condition can severely inhibit its performance and greatly increase peak loads. This can accelerate the degradation of the bushes further, and also cause dangerous handling...
Modelica and Dymola provide library developers with methods to hide content from their users; some of which were discussed in this previous post Dymola Library Concealment – How to, and why? – Claytex. As developers we may use these concealment methods to protect our intellectual property, or we may...
Sign Conventions, for variables with a positive and negative direction, are common place in the engineering world. VeSyMA is no different, with many commonly used variables adhering to a sign convention. Most of the time, VeSyMA follows the ISO (International Organisation for Standardisation) standard for a variable or quantity...
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