Due to the high toughness of SiC material, in general, the polishing time of a SiC mirror has been challenging to determine by optician. In the optical shop, optician normally enters input parameters into a polishing machine prior to polish out the mirror surface. The target surface removal rate, specified by an optician, are highly depending on polishing schedule. A very tight polishing schedule commonly thrusts adventurous larger target quantities on the optician. However, the target numbers should be determined by the reliability of relationships between the machine input parameter and output removal rate. In this paper, we introduce an initial model which can reliably suggest machine input parameters for polishing head. These parameters can control polishing processes to achieve the target TIF (Tool Influence Function) depth which is an unit polishing removal quantity on the SiC mirror optical surfaces.
{"title":"Initial polishing machine control model to determine target TIF depth on SiC mirror surfaces (Conference Presentation)","authors":"Jeong-Yeol Han, Suyeon Cha, Dohoon Kim, M. Cho","doi":"10.1117/12.2529836","DOIUrl":"https://doi.org/10.1117/12.2529836","url":null,"abstract":"Due to the high toughness of SiC material, in general, the polishing time of a SiC mirror has been challenging to determine by optician. In the optical shop, optician normally enters input parameters into a polishing machine prior to polish out the mirror surface. The target surface removal rate, specified by an optician, are highly depending on polishing schedule. A very tight polishing schedule commonly thrusts adventurous larger target quantities on the optician. However, the target numbers should be determined by the reliability of relationships between the machine input parameter and output removal rate. In this paper, we introduce an initial model which can reliably suggest machine input parameters for polishing head. These parameters can control polishing processes to achieve the target TIF (Tool Influence Function) depth which is an unit polishing removal quantity on the SiC mirror optical surfaces.","PeriodicalId":275868,"journal":{"name":"Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems IV","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131684163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OPTICAL MIRRORS DESIGN USING TOPOLOGY OPTIMIZATION FOR ADDITIVE MANUFACTURING (ABSTRACT) Author : Nisrine Louh1 Co-authors : Malorie Villemaire1, Stephanie Behar Lafenetre1, Nicolas Rousselet2, Vincent Costes3 Contact : Nisrine Louh – nisrine.louh@thalesaleniaspace.com 1. Thales Alenia Space, 5 Allee des Gabians, 06150 Cannes, France 2. 3D Ceram, Limoges 3. CNES Themes – Mirrors, topology optimization, space structures, additive manufacturing For scientific satellite, the mirrors are always on the critical path of a project. The design and the sizing of the mirrors are constrained by the mechanical holding, the mass, the cost and the manufacturability. These criteria require numerous compromises and therefore, optical mirrors are designed as early as possible to anticipate the leanings, the manufacturing time and the risks during this manufacture. In this article, we will describe a new method developed to optimize the space optics taking into account the various specifications and using topology optimization. This development is settled in the perimeter of a CNES study named FAME in collaboration with 3DCERAM. The goal is to highlight the feasibility and interest to “print” a telescope mirror. Our objective is to define a way to reduce the weight, to avoid deformation of the optical surface and at the same time to keep a stiffness that allows the structure to withstand the vibration loads. Moreover, this new approach permits very innovative designs. First, the optimization is made on both the mass and the stiffness. Then, mechanical analyses are performed to verify that the design is viable on the mechanical environment of the mirror. Besides, we verify that the Wavefront Error and the optical performances are compliant with our needs and requirements. Thales Alenia Space is interested in studying and introducing additive manufacturing in its processes. The advantages and limits of this new technology to “print” complex designs are presented.
基于拓扑优化的增材制造光学反射镜设计(摘要)作者:Nisrine Louh合著者:Malorie Villemaire1, Stephanie Behar Lafenetre1, Nicolas Rousselet2, Vincent costes3联系人:Nisrine Louh - nisrine.louh@thalesaleniaspace.com泰雷兹阿莱尼亚宇航公司，加比安巷5号，法国戛纳061503D摄影，利摩ges3。CNESThemes -反射镜，拓扑优化，空间结构，增材制造对于科学卫星来说，反射镜总是处于项目的关键路径上。反射镜的设计和尺寸受到机械夹持、质量、成本和可制造性的限制。这些标准需要做出许多妥协，因此，光学反射镜的设计要尽可能早，以预测生产过程中的倾斜、制造时间和风险。在本文中，我们将描述一种新的方法来优化空间光学考虑到各种规格和使用拓扑优化。这项开发是在CNES与3DCERAM合作进行的名为FAME的研究中完成的。其目的是强调“打印”望远镜镜面的可行性和趣味性。我们的目标是确定一种减轻重量的方法，以避免光学表面变形，同时保持结构能够承受振动载荷的刚度。此外，这种新方法允许非常创新的设计。首先对结构的质量和刚度进行了优化。然后进行了力学分析，验证了该设计在反射镜的机械环境下是可行的。此外，我们还验证了波前误差和光学性能符合我们的需求和要求。泰雷兹阿莱尼亚航天公司有兴趣在其工艺中研究和引入增材制造。介绍了这种新技术“打印”复杂设计的优点和局限性。
{"title":"Optical mirrors design using topology optimization for additive manufacturing (Conference Presentation)","authors":"Nisrine Louh","doi":"10.1117/12.2529515","DOIUrl":"https://doi.org/10.1117/12.2529515","url":null,"abstract":"OPTICAL MIRRORS DESIGN USING TOPOLOGY OPTIMIZATION FOR ADDITIVE MANUFACTURING (ABSTRACT) \u0000Author : Nisrine Louh1\u0000Co-authors : Malorie Villemaire1, Stephanie Behar Lafenetre1, Nicolas Rousselet2, Vincent Costes3\u0000Contact : Nisrine Louh – nisrine.louh@thalesaleniaspace.com \u00001. Thales Alenia Space, 5 Allee des Gabians, 06150 Cannes, France\u00002. 3D Ceram, Limoges\u00003. CNES\u0000\u0000Themes – Mirrors, topology optimization, space structures, additive manufacturing \u0000For scientific satellite, the mirrors are always on the critical path of a project. The design and the sizing of the mirrors are constrained by the mechanical holding, the mass, the cost and the manufacturability. These criteria require numerous compromises and therefore, optical mirrors are designed as early as possible to anticipate the leanings, the manufacturing time and the risks during this manufacture. In this article, we will describe a new method developed to optimize the space optics taking into account the various specifications and using topology optimization. This development is settled in the perimeter of a CNES study named FAME in collaboration with 3DCERAM. The goal is to highlight the feasibility and interest to “print” a telescope mirror. Our objective is to define a way to reduce the weight, to avoid deformation of the optical surface and at the same time to keep a stiffness that allows the structure to withstand the vibration loads.\u0000Moreover, this new approach permits very innovative designs. First, the optimization is made on both the mass and the stiffness. Then, mechanical analyses are performed to verify that the design is viable on the mechanical environment of the mirror. Besides, we verify that the Wavefront Error and the optical performances are compliant with our needs and requirements.\u0000Thales Alenia Space is interested in studying and introducing additive manufacturing in its processes. The advantages and limits of this new technology to “print” complex designs are presented.","PeriodicalId":275868,"journal":{"name":"Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems IV","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122606627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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