Study group

From 16 of Abril to 19 of Abril

Problems

Problem 1

A Stewart platform, also known as a hexapod positioner, is a kind of parallel manipulator using an octahedral assembly of struts. A Stewart platform has six degrees of freedom (x, y, z, pitch, roll, & yaw).

There are six independently actuated legs, where the lengths of the legs are changed to position and orient the platform.

The forward kinematics problem: given the leg lengths, find the position and orientation, velocity and acceleration of the platform.

The inverse kinematics problem: given the position and orientation, velocity and acceleration of the platform obtain the legs lengths dynamics.

Problem 2: Travel-time for a single origin-destination

• REPORT: 60ESGI.BRISA.pdf (d1f5eb4b22097141bb1b21c1b284ac57)

The BRISA problem was to calculate the real time travel information using the Via-Verde (VV) technology (floating data) and automatic data for the area defined by the triangle A5 Lisboa-Cascais and A9 Estádio-Queluz.

To solve the problem we will be able to make use of the large amounts of traffic data that will soon become accessible electronically in real time; indeed there are two different information sources producing different data for the same object and context. There is a tremendous demand for simple information concerning just the travel-time for a single origin-destination and service level for a motorway section. It was suggested that we should use a Hybrid Traffic Flow Modelling to cope with this challenge.