Technology development for cryogenic deployable telescope structures and mechanisms

Atkinson, Charles B.; Gilman, Larry; Reynolds, P. T.

doi:10.1117/12.506388

Cited by 4 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Single joint repeatability tests are often performed to verify new joint design concepts [12] [13] [14] or to produce data to update the joint characteristics in a larger model [15]. Another test commonly performed on joints is the linearity of the deployed joint to varying load.…”

Section: Methods For Testing Joints or Folded Membersmentioning

confidence: 99%

Deployment Repeatability

Stohlman

Silver

Waller

2017

Testing Large Ultra-Lightweight Spacecraft

View full text Add to dashboard Cite

Every time a structure is deployed, it will have a slightly different deployed shape, and this deploymentto-deployment variation is part of the shape error budget. This shape variation can be estimated by combining the variation in every deformable part, or by testing the full structure. In the latter case, evaluating the deployment repeatability builds upon the testing or analysis of deployment kinematics (Chapter 6) and adds repetition.

show abstract

Section: Methods For Testing Joints or Folded Membersmentioning

confidence: 99%

Deployment Repeatability

Stohlman

Silver

Waller

2017

Testing Large Ultra-Lightweight Spacecraft

View full text Add to dashboard Cite

show abstract

“…Prototypes of all the PMBA mechanisms have been built and tested at their operating temperatures. The stability of the wing latches has been demonstrated on the Development Optical Telescope Assembly (Atkinson, 2003). A key element in the development of the PMBA has been the construction and testing of a full scale subsection (Fig.…”

Section: Telescope Opticsmentioning

confidence: 99%

“…The test configuration of the telescope is shown in Fig. 12, with a detailed description of the testing concept having been described in detail by Feinberg et al (2006).…”

Section: Integration and Testmentioning

confidence: 99%

The James Webb Space Telescope (JWST)

Clampin

2008

Advances in Space Research

View full text Add to dashboard Cite

“…Lessons learned from classical optomechanical design experience have been applied to the development of kinematic constraints between reflector segments on systems such as the James Webb Space Telescope. 5 Hysteretic friction mechanics in these kinematic interfaces is a recognized source of instability. 6 These six degree-of-freedom kinematic constraint designs are examples of a broader class of precision mechanisms with predictable load paths.…”

Section: Introductionmentioning

confidence: 99%

Submicron friction mechanics at ambient and cryogenic temperatures

Hinkle

Peterson

Klein

et al. 2005

UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II

View full text Add to dashboard Cite

Mechanism interface mechanics play an important role in the static and dynamic dimensional stability of deployable optical instruments. Friction mechanics in deployment mechanisms has been found to be a source of kinematic indeterminacy allowing elastic energy to be stored throughout the structure. At submicron scales, microslip mechanics allow this behavior to persist well below the classical Coulomb friction limit. This paper presents the design of a cryogenic tribometer for measuring this behavior in candidate mechanism interfaces in both room temperature and cryogenic environments. Room temperature results are presented and compared to a proposed generalized microslip model form. This model form is intended to allow the parametric characterization of microslip behavior caused by smooth nonconforming contact as well as roughness-induced microslip. Spherical ball-on-flat interface geometries were used with two unlubricated material combinations: 440C stainless steel ball on a 440C stainless steel flat and a silicon nitride ball on a 440C stainless steel flat. Consistent parameters were identified for the generalized microslip model from steady cyclic shear responses for both of these interface cases. While these parameters exhibited a measurable sensitivity to normal preload levels, the model form appears to provide the necessary level of robustness. Non-ideal transient shear phenomena including rate dependence were also observed but should play only a secondary role in future modeling efforts.

show abstract

Technology development for cryogenic deployable telescope structures and mechanisms

Cited by 4 publications

References 0 publications

Deployment Repeatability

Deployment Repeatability

The James Webb Space Telescope (JWST)

Submicron friction mechanics at ambient and cryogenic temperatures

Contact Info

Product

Resources

About