The Experts below are selected from a list of 363 Experts worldwide ranked by ideXlab platform

Langlais Mickael - One of the best experts on this subject based on the ideXlab platform.

  • Orientation du capteur sismologique de la station JAUF, située sur la commune de Jausiers (04) - Alpes-de-Haute-Provence
    HAL CCSD, 2016
    Co-Authors: Langlais Mickael
    Abstract:

    This image illustrates the operation of orienting the sensor of the JAUF seismological station in the RESIF network to the absolute north. This station is located in the commune of Jausiers at an altitude of 1640m and is part of the RESIF seismological network. It is equipped with a short period velocity meter of the Mark-Product L4C-3D type. This sensor measures the speed of soil movement in the three directions (Vertical, North and East). It is called "short-period" because it detects ground movements in a frequency range from 1Hz to about 50Hz, as opposed to long-period sensors, which allow ground movements with a period of several tens of seconds or even hundreds of seconds to be recorded. It is also a "passive" sensor in the sense that it is not electrically powered, making it more resistant over time but implying that it is less sensitive (about 10 times less) than the powered models. On the picture presented we visualize the orientation operation to the North of this velocity sensor using a Gyro Compass. This instrument allows us to know precisely (tenth of a degree) the absolute position of the sensor. This historic SISMALP/RENASS network station was completely modernized in the summer of 2016 thanks to funding from LABEX-OSUG@2020. The French Seismological and Geodetic Network RESIF, a national research infrastructure dedicated to the observation and understanding of the structure and dynamics of the Internal Earth. RESIF is based on high-tech observation networks, composed of seismological, geodetic and gravimetric instruments deployed in a dense manner throughout France. The data collected make it possible to study with high spatial and temporal resolution the deformation of the ground, surface and deep structures, seismicity on a local and global scale and natural hazards, and more particularly seismic events, on French territory. RESIF is part of the European (EPOS - European Plate Observing System) and global systems of instruments used to image the Earth's interior as a whole and to study many natural phenomena.Cette image illustre l’opération d’orientation au nord absolu du capteur de la station sismologique JAUF du réseau RESIF. Cette station est installée sur la commune de Jausiers à 1640m d’altitude. Cette station fait partie du réseau sismologique RESIF, elle est équipée d’un vélocimètre courte période du type Mark-Product L4C-3D. Ce capteur mesure la vitesse de déplacement du sol dans les trois directions (Vertical, Nord et Est). Il est dit « courte-période » car il détecte les mouvements du sol dans une gamme de fréquence allant de 1Hz à environ 50Hz, par opposition aux capteurs longues périodes qui eux permettent d’enregistrer des mouvements du sol ayant une période de plusieurs dizaines de secondes voire centaines de secondes. Il s’agit également d’un capteur « passif » en ce sens où il n’est pas alimenté électriquement, le rendant plus résistant dans la durée mais impliquant qu’il soit moins sensible (environ 10 fois moins) que les modèles alimentés. Sur l’image présentée nous visualisons l’opération d’orientation au Nord de ce capteur vélocimétrique en utilisant un Gyrocompas. Cet instrument nous permet de connaître avec précision (10e de degré) la position absolue du capteur. Cette station historique du réseau SISMALP/RENASS a été complètement modernisée durant l’été 2016 grâce à un financement obtenu au LABEX-OSUG@2020.Le Réseau sismologique et géodésique français RESIF, une infrastructure de recherche nationale dédiée à l’observation et la compréhension de la structure et de la dynamique Terre interne. RESIF se base sur des réseaux d’observation de haut niveau technologique, composés d’instruments sismologiques, géodésiques et gravimétriques déployés de manière dense sur tout le territoire français. Les données recueillies permettent d’étudier avec une haute résolution spatio-temporelle la déformation du sol, les structures superficielles et profondes, la sismicité à l’échelle locale et globale et les aléas naturels, et plus particulièrement sismiques, sur le territoire français. RESIF s’intègre aux dispositifs européens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intérieur de la Terre dans sa globalité et d’étudier de nombreux phénomènes naturels

  • Orientation du capteur sismologique de la station JAUF, située sur la commune de Jausiers (Alpes-de-Haute-Provence)
    HAL CCSD, 2016
    Co-Authors: Langlais Mickael
    Abstract:

    This image illustrates the operation of orienting to the absolute north the sensor of the seismological station JAUF in the RLBP network (Permanent Broadband Network). This station is located in the commune of Jausiers at an altitude of 1640m (Alpes-de-Haute-Provence) and is part of the Résif seismological network. It is equipped with a short period velocity meter of the Mark-Product L4C-3D type. This sensor measures the speed of soil movement in the three directions (Vertical, North and East). It is called "short-period" because it detects ground movements in a frequency range from 1Hz to about 50Hz, as opposed to long-period sensors, which allow ground movements with a period of several tens of seconds or even hundreds of seconds to be recorded. It is also a "passive" sensor in the sense that it is not electrically powered, making it more resistant over time but implying that it is less sensitive (about 10 times less) than the powered models. On the picture presented we visualize the orientation operation to the North of this velocity sensor using a Gyro Compass. This instrument allows us to know precisely (tenth of a degree) the absolute position of the sensor. This historic SISMALP/RENASS network station was completely modernized in the summer of 2016 thanks to funding from Labex-Osug@2020. The French Seismological and Geodetic Network Résif, a national research infrastructure dedicated to the observation and understanding of the structure and dynamics of the Internal Earth. Résif is based on high-tech observation networks, composed of seismological, geodetic and gravimetric instruments deployed in a dense manner throughout France. The data collected make it possible to study with high spatial and temporal resolution the deformation of the ground, surface and deep structures, seismicity on a local and global scale and natural hazards, and more particularly seismic events, on French territory. Résif is part of the European (EPOS - European Plate Observing System) and global systems of instruments used to image the Earth's interior as a whole and to study many natural phenomena.Cette image illustre l’opération d’orientation au nord absolu du capteur de la station sismologique JAUF du réseau RLBP (Réseau Large Bande Permanent). Cette station est installée sur la commune de Jausiers à 1640m d’altitude (Alpes-de-Haute-Provence). Cette station fait partie du réseau sismologique Résif, elle est équipée d’un vélocimètre courte période du type Mark-Product L4C-3D. Ce capteur mesure la vitesse de déplacement du sol dans les trois directions (Vertical, Nord et Est). Il est dit « courte-période » car il détecte les mouvements du sol dans une gamme de fréquence allant de 1Hz à environ 50Hz, par opposition aux capteurs longues périodes qui eux permettent d’enregistrer des mouvements du sol ayant une période de plusieurs dizaines de secondes voire centaines de secondes. Il s’agit également d’un capteur « passif » en ce sens où il n’est pas alimenté électriquement, le rendant plus résistant dans la durée mais impliquant qu’il soit moins sensible (environ 10 fois moins) que les modèles alimentés. Sur l’image présentée nous visualisons l’opération d’orientation au Nord de ce capteur vélocimétrique en utilisant un Gyrocompas. Cet instrument nous permet de connaître avec précision (10e de degré) la position absolue du capteur. Cette station historique du réseau SISMALP/RENASS a été complètement modernisée durant l’été 2016 grâce à un financement obtenu au Labex-Osug@2020.Le Réseau sismologique et géodésique français Résif, une infrastructure de recherche nationale dédiée à l’observation et la compréhension de la structure et de la dynamique Terre interne. Résif se base sur des réseaux d’observation de haut niveau technologique, composés d’instruments sismologiques, géodésiques et gravimétriques déployés de manière dense sur tout le territoire français. Les données recueillies permettent d’étudier avec une haute résolution spatio-temporelle la déformation du sol, les structures superficielles et profondes, la sismicité à l’échelle locale et globale et les aléas naturels, et plus particulièrement sismiques, sur le territoire français. Résif s’intègre aux dispositifs européens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intérieur de la Terre dans sa globalité et d’étudier de nombreux phénomènes naturels

O. Ringdahl - One of the best experts on this subject based on the ideXlab platform.

  • Development of an autonomous path tracking forest machine — a status report
    2005
    Co-Authors: F. Georgsson, T. Hellström, T. Johansson, K. Prorok, O. Ringdahl
    Abstract:

    In many respects traditional automation in the forest-machine industry has reached an upper limit, since the driver already has to deal with an excess of information and take too many decisions at a very high pace. To further automation still, introduction of semi-autonomous and autonomous functions are expected and considered necessary. This paper describes an ongoing project along these ideas. We describe the development of the hardware and software of an unmanned shuttle that shifts timber from the area of felling to the main roads for further transportation. A new path-tracking algorithm is introduced, and demonstrated as being superior to standard techniques, such as Follow-the-Carrot and Pure-Pursuit. To facilitate the research and development, a comprehensive software architecture for sensor and actuator interfacing is developed. Obstacle avoidance is accomplished by a new kind of radar, developed for and by the automotive industry. Localization is accomplished by a Kalman filter combining data from a Real-Time Kinematic Differential GPS/GLONASS and a Gyro/Compass. Tests conducted on a simulator and a small-scale robot show promising results. Tests on the real forest machine are ongoing, and will be completed before the end of 2005.

Sandström Urban - One of the best experts on this subject based on the ideXlab platform.

  • Development of an Autonomous Path Tracking Forest Machine : a status report
    Umeå universitet Institutionen för datavetenskap, 2005
    Co-Authors: Georgsson Fredrik, Hellström Thomas, Johansson Thomas, Prorok Kalle, Ringdahl Ola, Sandström Urban
    Abstract:

    In many respects traditional automation in the forest-machine industry has reached an up- per limit, since the driver already has to deal with an excess of information and take too many decisions at a very high pace. To further automation still, introduction of semi-autonomous and autonomous functions are expected and considered necessary. This paper describes an ongoing project along these ideas. We describe the development of the hardware and software of an unmanned shuttle that shifts timber from the area of felling to the main roads for fur- ther transportation. A new path-tracking algorithm is introduced, and demonstrated as being superior to standard techniques, such as Follow-the-Carrot and Pure-Pursuit. To facilitate the research and development, a comprehensive software architecture for sensor and actuator interfacing is developed. Obstacle avoidance is accomplished by a new kind of radar, developed for and by the automotive industry. Localization is accomplished by a Kalman filter combining data from a Real-Time Kinematic Differential GPS/GLONASS and a Gyro/Compass. Tests conducted on a simulator and a small-scale robot show promising results. Tests on the real forest machine are ongoing, and will be completed before the end of 2005

Frank Psota - One of the best experts on this subject based on the ideXlab platform.

F. Georgsson - One of the best experts on this subject based on the ideXlab platform.

  • Development of an autonomous path tracking forest machine — a status report
    2005
    Co-Authors: F. Georgsson, T. Hellström, T. Johansson, K. Prorok, O. Ringdahl
    Abstract:

    In many respects traditional automation in the forest-machine industry has reached an upper limit, since the driver already has to deal with an excess of information and take too many decisions at a very high pace. To further automation still, introduction of semi-autonomous and autonomous functions are expected and considered necessary. This paper describes an ongoing project along these ideas. We describe the development of the hardware and software of an unmanned shuttle that shifts timber from the area of felling to the main roads for further transportation. A new path-tracking algorithm is introduced, and demonstrated as being superior to standard techniques, such as Follow-the-Carrot and Pure-Pursuit. To facilitate the research and development, a comprehensive software architecture for sensor and actuator interfacing is developed. Obstacle avoidance is accomplished by a new kind of radar, developed for and by the automotive industry. Localization is accomplished by a Kalman filter combining data from a Real-Time Kinematic Differential GPS/GLONASS and a Gyro/Compass. Tests conducted on a simulator and a small-scale robot show promising results. Tests on the real forest machine are ongoing, and will be completed before the end of 2005.