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检索条件"任意字段=Optomechanical Design and Engineering 2001 Conference"

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Optimization methods for thermal modeling of optomechanical systems

Optimization methods for thermal modeling of optomechanical ...

引用

optomechanical design and engineering 2001 conference

作者： Papalexandris, MV Milman, MH Levine, M CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819441589

Numerical techniques for a elms of optimization problems associated with the thermal modeling of optomechanical systems are presented. Emphasis is placed on applications where radiation plays a dominant role. This work is motivated by the need for incorporating thermal analysis into integrated modeling of high-precision, space-borne optical systems. The specific problems of interest are thermal control to minimize the wavefront error by application of external heat loads, and the temperature estimation problem of predicting temperatures at arbitrary nodes of the model given noisy measurements on a subset of nodes. The proposed numerical techniques axe briefly described and compared to existing algorithms. Their accuracy and robustness axe demonstrated through numerical tests with models from ongoing NASA missions.

关键词： thermal networks thermal control estimation optomechanical design space telescopes

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Mechanical aspects of a dual field of view infrared lens

Mechanical aspects of a dual field of view infrared lens

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optomechanical design and engineering 2001 conference

作者： Palmer, TA Janos Technology Inc. (United States)

ISBN: (纸本)0819441589

A dual field of view infrared lens system that incorporates motorized mechanical movement in a compact package is presented. A feature of the design is to change the field of the lens system in less than one second. A secondary goal of the system is to maintain a low overall system profile. Attention is given to the task of identifying a candidate motor for the system. Some commonly encountered pitfalls in the design process are identified.

关键词： infrared design dual-field mechanical and motorized

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design and fabrication of a lightweight laser scanning mirror from Metal-Matrix Composites

Design and fabrication of a lightweight laser scanning mirro...

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optomechanical design and engineering 2001 conference

作者： Jiang, XX Laurin, D Levesque, D Nikanpour, D Canadian Space Agcy Space Technol St Hubert PQ J3Y 8Y9 Canada

ISBN: (纸本)0819441589

This paper discusses the design and fabrication of ultra lightweight laser scanning mirrors from two types of Metal-Matrix Composites (MMC) for the next generation Space Vision System (SVS). The materials selected for this study were SiC particulate reinforced aluminum (Al/SiC) and beryllium-aluminum (AlBeMet) composites. Three mirror designs are presented and compared in terms of mass, rotational inertia and first mode natural frequency. Mirror surface layer selection and processing are discussed. Problems encountered during the mirror fabrication and the ways to solve it are presented.

关键词： lightweight optics laser scanning mirror MMC SVS

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design optimization of actively controlled optics

Design optimization of actively controlled optics

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conference on optomechanical engineering 2000

作者： Michels, GJ Genberg, VL Sigmadyne Inc Rochester NY 14611 USA

ISBN: (纸本)0819438634

The finite element method is used to perform optimization of an actively controlled mirror's structural design. The theory of the method of modeling actuators is developed followed by execution of a test case demonstrating the effectiveness of this method in improving the correctability of a lightweight mirror. design variables include shape and sizing optimization of the mirror's structural design. The design objective is the root-mean-square optical surface error after best correction of a wavefront with power aberration. design constraints ate applied to the mirror weight and the mounted natural frequency.

关键词： design optimization active optics finite element

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Application of genetic algorithms for design optimization of a Bragg cell

Application of genetic algorithms for design optimization of...

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optomechanical design and engineering 2001 conference

作者： Nikulin, VV Skormin, VA Binghamton Univ Watson Sch Eng Laser Commun Res Lab Binghamton NY USA

ISBN: (纸本)0819441589

Non-mechanical beam steering technologies, utilizing acousto-optics, allow for achieving the high bandwidth laser beam positioning required for optical communications, laser scanners, LADARs, etc. Properties of the Bragg cell, chiefly responsible for the efficiency and attainable characteristics of the entire positioning system, are assured by successful design of this optical component. However, design of Bragg cells is dominated by experience and intuition of the designers and the potential of this technology is not fully utilized. An optimal design problem of a Bragg cell is formulated on the basis of known equations of the underlying physical phenomena, and a genetic optimization scheme is applied for the solution of the resultant formidable problem. The approach not only yields a design solution, but also allows for the variation of the design criterion and emphasizing particular properties of the resultant component. The prowess of the proposed approach has been demonstrated by design optimization examples.

关键词： mathematical model nonlinear constraint optimization genetic algorithms loss function penalty function performance criterion

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Making software get along: Integrating optical and mechanical design programs

Making software get along: Integrating optical and mechanica...

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conference on optomechanical engineering 2000

作者： Shackelford, CJ Chinnock, RB Optimum Technol Inc Southbridge MA 01550 USA

ISBN: (纸本)0819438634

As modern optomechanical engineers, we have the good fortune of having very sophisticated software programs available to us. The current optical design, mechanical design, industrial design, and CAM programs are very powerful tools with some very desirable features. However, no one program can do everything necessary to complete an entire optomechanical system design. Each program has a unique set of features and benefits, and typically two or more will be used during the product development process. At a minimum, an optical design program and a mechanical CAD package will be employed. As we strive for efficient, cost-effective, and rapid progress in our development projects, we must use these programs to their full advantage, while keeping redundant tasks to a minimum. Together, these programs offer the promise of a "seamless" flow of data from concept all the way to the download of part designs directly to the machine shop for fabrication. In reality, transferring data from one software package to the next is often frustrating. Overcoming these problems takes some know-how, a bit of creativity, and a lot of persistence. This paper describes a complex optomechanical development effort in which a variety of software tools were used from the concept stage to prototyping. It will describe what software was used for each major design task, how we learned to use them together to best advantage, and how we overcame the frustrations of software that didn't get along.

关键词： optomechanical design optical design software software integration data exchange data file translation computer aided design computer aided machining solid modeling surface modeling optical modeling

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Software for integrated optical design analysis

Software for integrated optical design analysis

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optomechanical design and engineering 2001 conference

作者： Moore, J Troy, E Patrick, B Stallcup, M SRS Technologies (United States) NASA Marshall Space Flight Ctr. (United States)

ISBN: (纸本)0819441589

The Integrated Optical design Analysis (IODA) program is a software tool being developed to support concurrent engineering design of complex optical systems. IODA provides seamless data fusion between thermal, structural, and optical models used to design the system. The software architecture was developed by reviewing current design processes and developing software to automate the existing procedures. IODA significantly reduces the design iteration cycle time and eliminates many potential sources of error.

关键词： optical design telescope design integrated modeling lightweight optics

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Structural analysis of a 50 cm diameter open-back triangular cell beryllium mirror in a cryogenic environment

Structural analysis of a 50 cm diameter open-back triangular...

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optomechanical design and engineering 2001 conference

作者： Craig, L Cline, T Hadaway, J Nein, M Smithers, M Keidel, J Stahl, P George C Marshall Space Flight Ctr MSFC AL 35812 USA

ISBN: (纸本)0819441589

This paper discusses NASTRAN finite element analysis of the Sub-scale Beryllium Mirror Demonstrator (SBMD), which has been developed by Ball Aerospace as an experimental lightweight (9.76 kg/m(2) areal density) design concept for the Next Generation Space Telescope (NGST). The mirror was repeatedly subjected to a 30 K environment in the large cryogenic test chamber at Marshall Space Flight Center (MSFC). Deformations on the mirror surface were measured optically. The surface distortions predicted by NASTRAN were analyzed for comparison with the measured values. Model results compared more favorably with measured results for the ambient temperature cases. For the cryogenic cases, the influence of geometry and material property variations was investigated to obtain closer correlation.

关键词： Mirrors Cryogenics Beryllium Temperature metrology Data modeling Monochromatic aberrations Aerospace engineering Finite element methods Space telescopes Structural analysis

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design and detection of super-precision positioning stage with nanometer resolution

Design and detection of super-precision positioning stage wi...

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optomechanical design and engineering 2001 conference

作者： Yin, CY Lin, DJ Wu, J Zhang, R Tsing Hua Univ Dept Precis Instruments & Mechanol State Key Lab Precis Measurement Beijing 100084 Peoples R China

ISBN: (纸本)0819441589

A precision positioning system with a high displacement resolution has been widely required for modem industrialized applications, such as microelectronics, super-precision manufacturing, etc. This paper discusses the design and the features of a new piezodriven precision micro positioning stage utilizing flexure hinges. Theoretical analysis for the stiffness of the flexure hinge is also given briefly. A piezoelectric ceramic(PZT) is applied to chive the precision stage, whose displacement can reach 5 mum when employed with 1000 voltage power. In order to testify the robust and measurement stability of the precision stage, three kinds of PZT produced in Germany. Japan and China respectively are utilized. A dual-frequency interferometer with nanometer resolution and accuracy is adopted to evaluate the mechanical characteristics of the positioning stage. The experimental result shows that the open loop control of the stage provides 0.2nm positioning resolution along the moving direction.

关键词： positioning stage flexure hinge piezoelectric ceramic dual-frequency interferometer nanometer resolution

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Establishing calibration tolerances for a scanning seeker optical bench by correlating Influence Function and Code V analysis methods.

Establishing calibration tolerances for a scanning seeker op...

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optomechanical design and engineering 2001 conference

作者： Perona, BJ Yarbrough, C Raytheon Missile Syst Tucson AZ USA

ISBN: (纸本)0819441589

For production line manufacturing of Scanning Seekers, the optical train set-up, assembly, alignment and buy-off of optical parameters requires utilization of an automated Optical Test Bench by trained operators. Adjustment of the optical elements to obtain the specified seeker parameters, such as scan-diameter and focus, can be a time consuming iterative process if test errors and techniques of the test bench are not within sufficient accuracy limits of the end product specification. The periodic calibration of the opto-mechanical components is essential to ensure that all aspects of the test system are traceable to standards and the equipment itself has not become inflicted with random measurement errors. This paper covers the development of calibration limits and adjustment tolerances for an optical test bench using the methods of Influence Functions(1), analysis using Code V-2 and addressing the limitations of optical bench components.

关键词： mechanical design optical bench testing calibration tolerance

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