Simbus Product EXAMPLES
Transverse Half-Car Model with Antiroll Bar
This example shows how Simbus Bondgraphs can be used to model the vertical dynamics of a car with an antiroll bar (or “sway bar”) with the “transverse half-car model” (THCM). Antiroll bars are used to reduce the difference in compression / extension of the unsprung mass elements of a vehicle with independent suspension. This helps to balance vertical force distribution during turns and improves road-holding. This is important for vehicles with relatively high centers of mass such as SUVs and some cargo-carrying vehicles.
The bond graph and parameters are taken from the paper “Transverse Third-Damper to Improve Suspension Systems for In-Wheel Motor Driven Electric Vehicles“. The transfer functions specified in this paper are plotted following completion of a simulation run. The bond numbering in the paper is also replicated in this model. All the required parameters are stored in the model’s workspace. These can be changed to see the effect on the above transfer functions.
Transverse Half-Car Model with Koenigsegg Triplex Suspension System
This example shows how Simbus Bondgraphs can be used to model the vertical dynamics of a car that combines a damper with the traditional antiroll bar. This arrangement is used in the Koenigsegg Triplex Suspension System pioneered by Koenigsegg for high-performance supercars.
Hector Medina and Natasha Carpenter show in their paper “Transverse Third-Damper to Improve Suspension Systems for In-Wheel Motor Driven Electric Vehicles” that the third damper offers better road-holding for electric vehicles that have in-wheel motors (which therefore have larger unsprung masses than their nonelectric counterparts). The other advantage of the third damper is that it is a passive device and does not require energy-consuming active control.
The transfer functions specified in the paper are plotted following completion of a simulation run. The bond graph and parameters are taken from the paper. These parameters are stored in the model’s workspace and can be changed to see the effect on the transfer functions. The bond numbering used in the paper is also replicated in this model.
Simple DC-DC Boost (Step-Up) Converter
This example shows how Simbus Bondgraphs can be used to create a model of a DC-DC boost (voltage step-up) converter. This particular boost converter description is one of the simplest possible and consists of only four components: an inductor, a diode, a semiconductor switch (such as a MOSFET or an IGBT), and an output capacitor. This kind of converter uses a single switch and is known as an Asynchronous Converter. A Sychronous Converter is one where the diode is replaced by another semiconductor switch.
A voltage source is attached to the input and a load impedance is attached to the output. The should be provided at the A-side and B-side of the converter block respectively. The formulas used by the block to size the internal components assume that the boost converter operates in continuous conduction mode. Good starting points to understand the operation of this boost converter can be found in this article and in this video.
The boost converter is implemented as a reusable block. Make sure to distribute blk_boost_converter_simple.p and blk_boost_converter_simple.m if you use and share this block in your own models.
Copyright and licensing information for the circuit image is available here.
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