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Hydraulic System Planning - 2Problem descriptionA simplified version of the hydraulic system on a space shuttle consists of a directed graph, G, such that:
Tanks can be full or empty. Valves can be opens or closed. Some of the valves may be leaking. A state of G is specified by the set of full tanks, the set of open valves, and the set of leaking valves. A node of G is called pressurized in state S if it is a full tank or if there exists a path from some full tank of G to this node such that all the valves on the edges of this path are open. We assume that in a state S a shuttle controller can open a valve V2 corresponding to a directed link <N1,N2> only if N1 is pressurized. (Note, a leaking valve can be opened.) Problem: Given a graph G together with a initial state of G and a jet j, a shuttle controller needs to find a We assume that your program will contain the following input and output atoms: Input atomsThe graph should be described by the collection of ground atoms:
The state description should use atoms:
The goal to achieve:
Output atomsA sequence of atoms of the form switchon(v, t). which means to open valve v at time step t. The switches should occur at consecutive time steps beginning from 0. Authors: Michael Gelfond, Ricardo Morales and Yuanlin Zhang. |