The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform
Frédérik Brassard - One of the best experts on this subject based on the ideXlab platform.
-
Modal Testing of Space Exploration Rover Prototypes
Special Topics in Structural Dynamics Volume 6, 2014Co-Authors: Y. Soucy, Frédérik BrassardAbstract:The Exploration Core program of the Canadian Space Agency (CSA) has developed a series of terrestrial prototypes of planetary rovers and payloads in view of future space exploration missions. This paper presents results and experience gained in performing modal testing on a JUNO rover, one of the families of the CSA rover fleet. The main objectives of these modal tests were to (1) develop efficient procedures for obtaining test-based modal parameters of rover-type structures, and (2) help develop a finite element model of a rover which could be used to predict the dynamic loads and responses the rover will have during its whole life. The test article configurations were (1) a rover and (2) the rover with a mast (to be used as support for scientific instrumentation and Navigational Equipment). Since this activity was the first experience of the group in modal testing of mobile type hardware such as rovers, the process for getting valid modal parameters of the test articles turned out of be more complicated than anticipated. This led to the performance of additional sensitivity studies whose interesting results will be accounted for in future testing of rovers. The paper includes some results of these studies and some lessons learned in testing the rover hardware.
-
Modal Testing of Space Exploration Rover Prototypes
Special Topics in Structural Dynamics Volume 6, 2014Co-Authors: Y. Soucy, Frédérik BrassardAbstract:The Exploration Core program of the Canadian Space Agency (CSA) has developed a series of terrestrial prototypes of planetary rovers and payloads in view of future space exploration missions. This paper presents results and experience gained in performing modal testing on a JUNO rover, one of the families of the CSA rover fleet. The main objectives of these modal tests were to (1) develop efficient procedures for obtaining test-based modal parameters of rover-type structures, and (2) help develop a finite element model of a rover which could be used to predict the dynamic loads and responses the rover will have during its whole life. The test article configurations were (1) a rover and (2) the rover with a mast (to be used as support for scientific instrumentation and Navigational Equipment). Since this activity was the first experience of the group in modal testing of mobile type hardware such as rovers, the process for getting valid modal parameters of the test articles turned out of be more complicated than anticipated. This led to the performance of additional sensitivity studies whose interesting results will be accounted for in future testing of rovers. The paper includes some results of these studies and some lessons learned in testing the rover hardware.
Hamdi Noureddine - One of the best experts on this subject based on the ideXlab platform.
-
Strategic planning of North Atlantic Oceanic air traffic based on a new wind-optimal route structure
HAL CCSD, 2017Co-Authors: Dhief Imen, Dougui, Nour Elhouda, Delahaye Daniel, Hamdi NoureddineAbstract:International audienceRecently, air traffic is steadily increasing all over the world. Particularly, the air traffic over the North Atlantic airspace has witnessed an incessant increase. This increase was expected since it connects two densely-populated areas, namely North America and Europe. Otherwise, up to now the efficiency of trans-Atlantic flights is low due to the limited Navigational Equipment and radar coverage. The availability of Automated Dependent Surveillance-Broadcast (ADS-B) systems represents a new opportunity to better the strategic planning of flights over the oceanic area by reducing the separation standards. Besides, oceanic flights are subject to very strong winds. Recently, several researches proved that flying wind-optimal route yields to a significant fuel and time savings for each flight. Thus, optimizing trans-Atlantic routes and providing reliable flight trajectories become a primordial issue for the oceanic air traffic management. In this paper, we propose a new trans-Atlantic route structure that benefits from the jet streams in order to construct windoptimal flight trajectories. First, we describe the methodology used to design our new route structure. Then, an optimization model for detecting and resolving conflicts is introduced. The analysis was carried out in real traffic data to prove the efficiency of the developed method. Experimental findings show that our approach provides encouraging results in terms of conflict resolution and time saving
Noureddine Hamdi - One of the best experts on this subject based on the ideXlab platform.
-
Strategic planning of North Atlantic Oceanic air traffic based on a new wind-optimal route structure
2017Co-Authors: Imen Dhief, Nour Elhouda Dougui, Daniel Delahaye, Noureddine HamdiAbstract:Recently, air traffic is steadily increasing all over the world. Particularly, the air traffic over the North Atlantic airspace has witnessed an incessant increase. This increase was expected since it connects two densely-populated areas, namely North America and Europe. Otherwise, up to now the efficiency of trans-Atlantic flights is low due to the limited Navigational Equipment and radar coverage. The availability of Automated Dependent Surveillance-Broadcast (ADS-B) systems represents a new opportunity to better the strategic planning of flights over the oceanic area by reducing the separation standards. Besides, oceanic flights are subject to very strong winds. Recently, several researches proved that flying wind-optimal route yields to a significant fuel and time savings for each flight. Thus, optimizing trans-Atlantic routes and providing reliable flight trajectories become a primordial issue for the oceanic air traffic management. In this paper, we propose a new trans-Atlantic route structure that benefits from the jet streams in order to construct windoptimal flight trajectories. First, we describe the methodology used to design our new route structure. Then, an optimization model for detecting and resolving conflicts is introduced. The analysis was carried out in real traffic data to prove the efficiency of the developed method. Experimental findings show that our approach provides encouraging results in terms of conflict resolution and time savings
Guedes C Soares - One of the best experts on this subject based on the ideXlab platform.
-
causal factors in accidents of high speed craft and conventional ocean going vessels
Reliability Engineering & System Safety, 2008Co-Authors: Pedro Antao, Guedes C SoaresAbstract:An analysis of 40 ocean-going commercial vessel accidents is compared with the study of a similar number of high-speed crafts (HSCs) accidents, using in both cases a methodology that highlights the sequence of events leading to the accident and identifies the associated latent or causal factors. The main objective of this study was to identify and understand the difference in the pattern of causal factors associated with HSC accidents, as compared with the more traditional ocean-going ships. From the analysis one can see that the HSC accidents are mainly related to bridge personnel and operations, where the human element is the key factor identified as being responsible for the majority of the accidents. When compared with ocean-going commercial vessels, it is clear that Navigational Equipment and procedures have a larger preponderance in terms of the occurrence of accidents of HSC and particular attention should be given to these issues.
Y. Soucy - One of the best experts on this subject based on the ideXlab platform.
-
Modal Testing of Space Exploration Rover Prototypes
Special Topics in Structural Dynamics Volume 6, 2014Co-Authors: Y. Soucy, Frédérik BrassardAbstract:The Exploration Core program of the Canadian Space Agency (CSA) has developed a series of terrestrial prototypes of planetary rovers and payloads in view of future space exploration missions. This paper presents results and experience gained in performing modal testing on a JUNO rover, one of the families of the CSA rover fleet. The main objectives of these modal tests were to (1) develop efficient procedures for obtaining test-based modal parameters of rover-type structures, and (2) help develop a finite element model of a rover which could be used to predict the dynamic loads and responses the rover will have during its whole life. The test article configurations were (1) a rover and (2) the rover with a mast (to be used as support for scientific instrumentation and Navigational Equipment). Since this activity was the first experience of the group in modal testing of mobile type hardware such as rovers, the process for getting valid modal parameters of the test articles turned out of be more complicated than anticipated. This led to the performance of additional sensitivity studies whose interesting results will be accounted for in future testing of rovers. The paper includes some results of these studies and some lessons learned in testing the rover hardware.
-
Modal Testing of Space Exploration Rover Prototypes
Special Topics in Structural Dynamics Volume 6, 2014Co-Authors: Y. Soucy, Frédérik BrassardAbstract:The Exploration Core program of the Canadian Space Agency (CSA) has developed a series of terrestrial prototypes of planetary rovers and payloads in view of future space exploration missions. This paper presents results and experience gained in performing modal testing on a JUNO rover, one of the families of the CSA rover fleet. The main objectives of these modal tests were to (1) develop efficient procedures for obtaining test-based modal parameters of rover-type structures, and (2) help develop a finite element model of a rover which could be used to predict the dynamic loads and responses the rover will have during its whole life. The test article configurations were (1) a rover and (2) the rover with a mast (to be used as support for scientific instrumentation and Navigational Equipment). Since this activity was the first experience of the group in modal testing of mobile type hardware such as rovers, the process for getting valid modal parameters of the test articles turned out of be more complicated than anticipated. This led to the performance of additional sensitivity studies whose interesting results will be accounted for in future testing of rovers. The paper includes some results of these studies and some lessons learned in testing the rover hardware.
