{"id":236476,"date":"2022-02-16T12:41:43","date_gmt":"2022-02-16T11:41:43","guid":{"rendered":"https:\/\/oscar-iss.space\/?p=236476"},"modified":"2026-03-25T11:13:34","modified_gmt":"2026-03-25T10:13:34","slug":"bulletin-4","status":"publish","type":"post","link":"https:\/\/oscar-iss.space\/index.php\/2022\/02\/16\/bulletin-4\/","title":{"rendered":"Bulletin #4"},"content":{"rendered":"\n\n[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.10.5&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;RGBA(0,0,0,0)&#8221; custom_padding=&#8221;0px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;0px||8px|0px|false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.10.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; text_orientation=&#8221;justified&#8221; global_colors_info=&#8221;{}&#8221;]<p>Le prototype d\u2019OSCAR a \u00e9t\u00e9 r\u00e9alis\u00e9 par les ing\u00e9nieurs du LISA (Laboratoire Interuniversitaire des Syst\u00e8mes Atmosph\u00e9riques). \u00c0 cette occasion, l\u2019\u00e9quipe compl\u00e8te du projet OSCAR s\u2019est rendue au laboratoire, \u00e0 Cr\u00e9teil pour \u00e9changer avec l\u2019\u00e9quipe de IR-COASTER sur l\u2019avanc\u00e9e g\u00e9n\u00e9rale du projet, et la viabilit\u00e9 du dispositif de cr\u00e9ation d\u2019une partition dans l\u2019espace.<\/p>\n<p>Les premiers design d\u2019OSCAR, imagin\u00e9s par St\u00e9phane Thidet, ont \u00e9t\u00e9 pr\u00e9serv\u00e9s, tout en int\u00e9grant les modifications demand\u00e9es par l\u2019Agence Spatiale Europ\u00e9enne lors de la revue pr\u00e9liminaire de d\u00e9finition (PRD). Ainsi, dans le but d\u2019assurer la s\u00e9curit\u00e9 des astronautes, le design des curseurs de l\u2019orgue a d\u00fb \u00eatre r\u00e9vis\u00e9\u00a0: la profondeur du rail dans lequel circule le curseur a augment\u00e9 et la forme du curseur a \u00e9t\u00e9 modifi\u00e9e afin qu\u2019aucune asp\u00e9rit\u00e9 ne permette \u00e0 un astronaute de coincer accidentellement son gant dans un des rails de l\u2019orgue.<\/p>\n<p>OSCAR est install\u00e9 directement sur le capot d\u2019IR-COASTER. Afin de g\u00e9rer au mieux l\u2019espace disponible, il est divis\u00e9 en deux parties : d\u2019un c\u00f4t\u00e9 se situe le mat\u00e9riel \u00e9lectronique, destin\u00e9 \u00e0 l\u2019acquisition de mesures, et de l\u2019autre c\u00f4t\u00e9 le m\u00e9canisme, constitu\u00e9 de ressorts classiques, de ressorts \u00e0 m\u00e9moire de forme et des curseurs de l\u2019orgue dont les d\u00e9placements alimentent le partitionneur en informations. En effet, lorsqu\u2019OSCAR sera mis en orbite terrestre, les ressorts de l\u2019orgue se contracteront lorsqu\u2019ils seront expos\u00e9s \u00e0 une temp\u00e9rature sup\u00e9rieure \u00e0 60\u00b0C et retrouveront leur position initiale en-de\u00e7\u00e0 de 20\u00b0C faisant d\u00e9placer les curseurs; ce sont ces diff\u00e9rentes variations qui seront converties en donn\u00e9es musicales en alimentant des oscillateurs harmoniques uen fois de retour sur Terre.\u00a0<\/p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/oscar-iss.space\/wp-content\/uploads\/2022\/02\/IMG_4935-1-768&#215;1024.jpg&#8221; alt=&#8221;Document de pr\u00e9sentation IR-COASTER pour la revue pr\u00e9liminaire&#8221; title_text=&#8221;IMG_4935&#8243; show_in_lightbox=&#8221;on&#8221; show_bottom_space=&#8221;off&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; width=&#8221;43%&#8221; min_height=&#8221;168px&#8221; custom_margin=&#8221;||18px||false|false&#8221; custom_padding=&#8221;8px|||||&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; text_orientation=&#8221;justified&#8221; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221; width=&#8221;100%&#8221;]<p style=\"text-align: center;\">Prototype d&#8217;Oscar \u00a9Observatoire de l&#8217;Espace, CNES<\/p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; text_orientation=&#8221;justified&#8221; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221; custom_margin=&#8221;|1px||||&#8221;]<p>En vue de la construction du mod\u00e8le de vol d\u2019OSCAR, le prototype r\u00e9alis\u00e9 doit subir de nombreux tests m\u00e9caniques, notamment, un test de r\u00e9action des curseurs de l\u2019orgue \u00e0 la chaleur. Toutefois, cet examen n\u2019a pas pu \u00eatre directement effectu\u00e9 sur le prototype d\u2019OSCAR, car celui-ci a \u00e9t\u00e9 r\u00e9alis\u00e9 en ABS, polym\u00e8re thermoplastique, un mat\u00e9riau ne r\u00e9sistant pas \u00e0 de hautes temp\u00e9ratures. Une maquette suppl\u00e9mentaire de l\u2019un des curseurs d\u2019OSCAR s\u2019est av\u00e9r\u00e9e n\u00e9cessaire, et a \u00e9t\u00e9 r\u00e9alis\u00e9e en aluminium. \u00a0Lors du test m\u00e9canique, une lampe IR a \u00e9t\u00e9 utilis\u00e9e comme source d\u2019exposition : les ressorts se sont r\u00e9chauff\u00e9s et contract\u00e9s, provoquant le d\u00e9placement du curseur, ce qui valide le dispositif de l\u2019orgue. Cette d\u00e9formation sera convertie en donn\u00e9es musicales, \u00e0 l\u2019aide d\u2019un logiciel, qui fera \u00e9galement l\u2019acquisition de toutes les mesures d\u2019environnement d\u2019IR-COASTER (rotation des m\u00e9canismes, variations de temp\u00e9ratures et de courants, etc), afin d\u2019\u00e9crire la partition <em>in situ<\/em>. Julien Thomas, l\u2019informaticien de l\u2019\u00e9quipe d\u2019OSCAR, venu d\u00e9couvrir le dispositif, collabore \u00e9troitement avec Kristian Harge l\u2019informaticien du LISA, dans le but d\u2019int\u00e9grer ce logiciel \u00e0 l\u2019ordinateur principal.<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.10.6&#8243; _module_preset=&#8221;default&#8221; min_height=&#8221;316.2px&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||7px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.10.6&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/oscar-iss.space\/wp-content\/uploads\/2022\/02\/Stephane-vs-lampe-scaled.jpg&#8221; alt=&#8221;maquette d\u2019OSCAR&#8221; title_text=&#8221;St\u00e9phane vs lampe&#8221; show_in_lightbox=&#8221;on&#8221; show_bottom_space=&#8221;off&#8221; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; width=&#8221;65%&#8221; min_height=&#8221;291px&#8221; custom_margin=&#8221;||18px||false|false&#8221; custom_padding=&#8221;||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text admin_label=&#8221;Texte&#8221; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;|124px||||&#8221; hover_enabled=&#8221;0&#8243; border_style_all=&#8221;none&#8221; border_width_left=&#8221;5px&#8221; border_color_left=&#8221;#486482&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<blockquote><p style=\"text-align: left;\">Test du curseur de l\u2019orgue d\u2019OSCAR<br \/>\u00a9Observatoire de l&#8217;Espace, CNES<\/p><\/blockquote>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.10.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/oscar-iss.space\/wp-content\/uploads\/2022\/02\/IMG_3517-bis-scaled.jpg&#8221; alt=&#8221;S\u00e9ance de travail autour de la maquette d\u2019OSCAR avec St\u00e9phane Thidet et les ing\u00e9nieurs du laboratoire LISA&#8221; title_text=&#8221;IMG_3517 bis&#8221; show_in_lightbox=&#8221;on&#8221; show_bottom_space=&#8221;off&#8221; admin_label=&#8221;Image&#8221; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; width=&#8221;94%&#8221; min_height=&#8221;300px&#8221; custom_margin=&#8221;||38px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; min_height=&#8221;32.6px&#8221; custom_margin=&#8221;-20px|49px||||&#8221; hover_enabled=&#8221;0&#8243; border_style_all=&#8221;none&#8221; border_width_left=&#8221;5px&#8221; border_color_left=&#8221;#486482&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<blockquote><p>Test du syst\u00e8me de pilotage du carrousel d\u2019IR-COASTER<br \/>\u00a9Observatoire de l&#8217;Espace, CNES<\/p><\/blockquote>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; text_orientation=&#8221;justified&#8221; custom_margin=&#8221;-22px|||||&#8221; custom_padding=&#8221;17px|||||&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<p>Par\u00a0ailleurs, le prototype de l\u2019exp\u00e9rience IR COASTER a \u00e9t\u00e9 \u00e9galement r\u00e9alis\u00e9 et le syst\u00e8me de pilotage du carrousel qui accueillera les \u00e9chantillons \u00e9tudi\u00e9s dans l\u2019espace est d\u00e9sormais fonctionnel. Les mesures effectu\u00e9es dans l\u2019espace seront envoy\u00e9es, via un protocole de communication \u00e0 l\u2019ordinateur principal et alimenteront le partitionneur d\u2019OSCAR.<\/p>\n<p>&nbsp;<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_3,1_3,1_3&#8243; _builder_version=&#8221;4.10.5&#8243; _module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; min_height=&#8221;165.7px&#8221; custom_padding=&#8221;0px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_3&#8243; _builder_version=&#8221;4.10.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_post_nav in_same_term=&#8221;on&#8221; show_prev=&#8221;off&#8221; next_text=&#8221;BULLETIN PR\u00c9C\u00c9DENT&#8221; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; title_font=&#8221;Alata|||on|||||&#8221; title_text_color=&#8221;#486482&#8243; title_font_size=&#8221;13px&#8221; title_letter_spacing=&#8221;2px&#8221; title_line_height=&#8221;3em&#8221; custom_css_next_link_arrow=&#8221;display:none;&#8221; border_radii=&#8221;on|3px|3px|3px|3px&#8221; border_color_all=&#8221;rgba(72,100,130,0.93)&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_post_nav][\/et_pb_column][et_pb_column type=&#8221;1_3&#8243; _builder_version=&#8221;4.10.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_button button_url=&#8221;https:\/\/oscar-iss.space\/index.php\/journal-dune-experience-artistique-2\/&#8221; button_text=&#8221;Retour au journal&#8221; button_alignment=&#8221;center&#8221; _builder_version=&#8221;4.10.6&#8243; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_use_icon=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][\/et_pb_column][et_pb_column type=&#8221;1_3&#8243; _builder_version=&#8221;4.10.5&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_post_nav in_same_term=&#8221;on&#8221; show_next=&#8221;off&#8221; prev_text=&#8221;Bulletin Suivant&#8221; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; title_font=&#8221;Alata|||on|||||&#8221; title_text_color=&#8221;#486482&#8243; title_font_size=&#8221;13px&#8221; title_letter_spacing=&#8221;2px&#8221; title_line_height=&#8221;3em&#8221; custom_css_prev_link_arrow=&#8221;display:none;&#8221; border_radii=&#8221;on|3px|3px|3px|3px&#8221; border_color_all=&#8221;rgba(72,100,130,0.93)&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_post_nav][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n\n","protected":false},"excerpt":{"rendered":"<p>Le prototype d\u2019OSCAR a \u00e9t\u00e9 r\u00e9alis\u00e9 par les ing\u00e9nieurs du LISA (Laboratoire Interuniversitaire des Syst\u00e8mes Atmosph\u00e9riques). \u00c0 cette occasion, l\u2019\u00e9quipe compl\u00e8te du projet OSCAR s\u2019est rendue au laboratoire, \u00e0 Cr\u00e9teil pour \u00e9changer avec l\u2019\u00e9quipe de IR-COASTER sur l\u2019avanc\u00e9e g\u00e9n\u00e9rale du projet, et la viabilit\u00e9 du dispositif de cr\u00e9ation d\u2019une partition dans l\u2019espace. Les premiers design [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":236488,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"1080"},"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Bulletin #4 - OSCAR<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/oscar-iss.space\/index.php\/2022\/02\/16\/bulletin-4\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bulletin #4 - OSCAR\" \/>\n<meta property=\"og:description\" content=\"Le prototype d\u2019OSCAR a \u00e9t\u00e9 r\u00e9alis\u00e9 par les ing\u00e9nieurs du LISA (Laboratoire Interuniversitaire des Syst\u00e8mes Atmosph\u00e9riques). \u00c0 cette occasion, l\u2019\u00e9quipe compl\u00e8te du projet OSCAR s\u2019est rendue au laboratoire, \u00e0 Cr\u00e9teil pour \u00e9changer avec l\u2019\u00e9quipe de IR-COASTER sur l\u2019avanc\u00e9e g\u00e9n\u00e9rale du projet, et la viabilit\u00e9 du dispositif de cr\u00e9ation d\u2019une partition dans l\u2019espace. 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