An Empirical Evaluation of the Effectiveness of Local Search for Replanning
Local search has been proposed as a means of responding to changes in problem context requiring replanning.
Planning scheduling replanning local search↗
Engineering topics
Knight, R.
Publications and source records attributed to Knight, R..
Integrating Model-based Artificial Intelligence Planning with Procedural Elaboration for Onboard Spacecraft Autonomy
This paper describes the integration of a model-based planner into a procedural architecture.
planning scheduling architecture↗
Monitor and Control of Deep Space Communications Through AI Planning
In recent years with the large increase in the number of space missions at NASA, the demand for deep space communications services to command and collect data from these missions has become more difficult to manage.
NASA space missions Deep Space Communications AI P↗
Automated Planning for Spacecraft and Mission Design
We present an AI planning system that automatically generates and evaluates mission plans for specified spacecraft designs.
planning↗
ASPEN-Automated Planning and Scheduling for Space Mission Operation
This paper describes the ASPEN system for automation of planning and scheduling for space mission operations.
Planning Scheduling Mission Operation↗
Using Iterative Repair to Improve the Responsiveness of Planning and Scheduling
The majority of planning and scheduling research has focused on batch-oriented models of planning.
Artificial↗
A Planning Approach to Monitor and Control For Deep Space Communications
In recent years with the large increase in the number of space missions at NASA and JPL (Jet Propulsion Laboratory), the demand for deep space communications services to command and collect data from these missions has become more difficult to manage.
Deep Space Network DSN NASA JPL Deep Space Communi↗
Iterative Repair Planning for Spacecraft Operations Using the Aspen System
This paper describes the Automated Scheduling and Planning Environment (ASPEN). ASPEN encodes complex spacecraft knowledge of operability constraints, flight rules, spacecraft hardware, science experiments and operations procedures to allow for automated generation of low level spacecraft sequences. Using a technique called iterative repair, ASPEN classifies constraint violations (i.e., conflicts) and attempts to repair each by performing a planning or scheduling operation. It must reason about which conflict to resolve first and what repair method to try for the given conflict. ASPEN is currently being utilized in the development of automated planner/scheduler systems for several spacecraft, including the UFO-1 naval communications satellite and the Citizen Explorer (CX1) satellite, as well as for planetary rover operations and antenna ground systems automation. This paper focuses on the algorithm and search strategies employed by ASPEN to resolve spacecraft operations constraints, as well as the data structures for representing these constraints.
Rabideau, G.↗
Using Interative Repair to Increase the Responsiveness of Planning and Scheduling for Autonomous Spacecraft
An autonomous spacecraft must balance long-term and short-term considerations. It must perform purposeful activities that ensure long-term science and engineering goals are achieved and ensure that it maintains resource margins.
autonomy operations planning execution scheduling↗
Iterative Repair Planning for Spacecraft Operations Using the Aspen System
This paper describes the Automated Scheduling and Planning Environment (ASPEN). ASPEN encodes complex spacecraft knowledge of operability constraints, flight rules, spacecraft hardware, science experiments and operations procedures to allow for automated generation of low level spacecraft sequences.
planning↗
Integrated Planning and Execution for Autonomous Spacecraft
This paper describes an integrated planning and execution architecture that supports continuous modification and updating of a current working plan in light of changing operating context.
Integrated↗
Development of HVOF Sprayed Erosion/Oxidation Resistant Coatings for Composite Structural Components in Propulsion Systems
Thermally sprayed coatings are being studied and developed as methods of enabling lightweight composites to be used more extensively as structural components in propulsion applications in order to reduce costs and improve efficiency through weight reductions. The primary goal of this work is the development of functionally graded material [FGM] polymer/metal matrix composite coatings to provide improved erosion/oxidation resistance to polyimide-based polymer matrix composite [PMC] substrates. The goal is to grade the coating composition from pure polyimide, similar to the PMC substrate matrix on one side, to 100% WC-Co on the other. Both step-wise and continuous gradation of the loading of the WC-Co reinforcing phase are being investigated, Details of the coating parameter development will be presented, specifically the high velocity oxy-fuel [HVOF] combustion spraying of pure PMR-I1 matrix material and layers of various composition PMR-II/WC-Co blends onto steel and PMR-15 composite substrates. Results of the HVOF process optimization, microstructural characterization, and analysis will be presented. The sprayed coatings were evaluated using standard metallographic techniques - optical and scanning electron microscopy [SEMI. An SEM + electron dispersive spectroscopy [EDS] technique has also been used to confirm retention of the PMR-I1 component. Results of peel/butt adhesion testing to determine adhesion will also be presented.
Ivosevic, M.↗