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At least 19 records

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NASA NTRS1973

SIRU development. Volume 3: Software description and program documentation

The development and initial evaluation of a strapdown inertial reference unit (SIRU) system are discussed. The SIRU configuration is a modular inertial subsystem with hardware and software features that achieve fault tolerant operational capabilities. The SIRU redundant hardware design is formulated about a six gyro and six accelerometer instrument module package. The six axes array provides redundant independent sensing and the symmetry enables the formulation of an optimal software redundant data processing structure with self-contained fault detection and isolation (FDI) capabilities. The basic SIRU software coding system used in the DDP-516 computer is documented.

Oehrle, J.↗

NASA NTRS1973

SIRU utilization. Volume 2: Software description and program documentation

A complete description of the additional analysis, development and evaluation provided for the SIRU system as identified in the requirements for the SIRU utilization program is presented. The SIRU configuration is a modular inertial subsystem with hardware and software features that achieve fault tolerant operational capabilities. The SIRU redundant hardware design is formulated about a six gyro and six accelerometer instrument module package. The modules are mounted in this package so that their measurement input axes form a unique symmetrical pattern that corresponds to the array of perpendiculars to the faces of a regular dodecahedron. This six axes array provides redundant independent sensing and the symmetry enables the formulation of an optimal software redundant data processing structure with self-contained fault detection and isolation (FDI) capabilities. Documentation of the additional software and software modifications required to implement the utilization capabilities includes assembly listings and flow charts

Oehrle, J.↗

NASA NTRS1977

Flight test results of the Strapdown hexad Inertial Reference Unit (SIRU). Volume 1: Flight test summary

Flight test results of the strapdown inertial reference unit (SIRU) navigation system are presented. The fault-tolerant SIRU navigation system features a redundant inertial sensor unit and dual computers. System software provides for detection and isolation of inertial sensor failures and continued operation in the event of failures. Flight test results include assessments of the system's navigational performance and fault tolerance.

Hruby, R. J.↗

NASA NTRS1977

Flight test results of the strapdown hexad inertial reference unit (SIRU). Volume 2: Test report

Hruby, R. J.↗

NASA NTRS1977

Flight test results of the Strapdown hexad Inertial Reference Unit (SIRU). Volume 3: Appendices A-G

Results of flight tests of the Strapdown Inertial Reference Unit (SIRU) navigation system are presented. The fault tolerant SIRU navigation system features a redundant inertial sensor unit and dual computers. System software provides for detection and isolation of inertial sensor failures and continued operation in the event of failures. Flight test results include assessments of the system's navigational performance and fault tolerance. Selected facets of the flight tests are also described in detail and include some of the following: (1) flight test plans and ground track plots; (2) navigation residual plots; (3) effects of approximations in navigation algorithms; (4) vibration spectrum of the CV-340 aircraft; and (5) modification of the statistical FDICR algorithm parameters for the flight environment.

Hruby, R. J.↗

NASA NTRS1973

SIRU development. Volume 1: System development

A complete description of the development and initial evaluation of the Strapdown Inertial Reference Unit (SIRU) system is reported. System development documents the system mechanization with the analytic formulation for fault detection and isolation processing structure; the hardware redundancy design and the individual modularity features; the computational structure and facilities; and the initial subsystem evaluation results.

Gilmore, J. P.↗

NASA NTRS1974

SIRU utilization. Volume 1: Theory, development and test evaluation

The theory, development, and test evaluations of the Strapdown Inertial Reference Unit (SIRU) are discussed. The statistical failure detection and isolation, single position calibration, and self alignment techniques are emphasized. Circuit diagrams of the system components are provided. Mathematical models are developed to show the performance characteristics of the subsystems. Specific areas of the utilization program are identified as: (1) error source propagation characteristics and (2) local level navigation performance demonstrations.

Musoff, H.↗

DOE OSTI2020

Materials Data on Lu(SiRu)2 by Materials Project

LuRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu3+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Lu–Si bond lengths are 3.19 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.37 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Lu3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on SiRu by Materials Project

RuSi crystallizes in the cubic P2_13 space group. The structure is three-dimensional. Ru4+ is bonded in a 7-coordinate geometry to seven equivalent Si4- atoms. There are a spread of Ru–Si bond distances ranging from 2.40–2.72 Å. Si4- is bonded in a 7-coordinate geometry to seven equivalent Ru4+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Pu(SiRu)2 by Materials Project

PuRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pu3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Pu–Si bond lengths are 3.20 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of corner and edge-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.39 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Pu3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Np(SiRu)2 by Materials Project

NpRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np3+ is bonded to eight equivalent Si4- atoms to form NpSi8 hexagonal bipyramids that share corners with sixteen equivalent RuSi4 tetrahedra, edges with four equivalent NpSi8 hexagonal bipyramids, edges with eight equivalent RuSi4 tetrahedra, and faces with four equivalent NpSi8 hexagonal bipyramids. All Np–Si bond lengths are 3.15 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form RuSi4 tetrahedra that share corners with eight equivalent NpSi8 hexagonal bipyramids, corners with four equivalent RuSi4 tetrahedra, edges with four equivalent NpSi8 hexagonal bipyramids, and edges with four equivalent RuSi4 tetrahedra. All Ru–Si bond lengths are 2.38 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Np3+, four equivalent Ru+2.50+, and one Si4- atom. The Si–Si bond length is 2.38 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on U(SiRu)2 by Materials Project

URu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. U4+ is bonded to eight equivalent Si4- atoms to form USi8 hexagonal bipyramids that share corners with sixteen equivalent RuSi4 tetrahedra, edges with four equivalent USi8 hexagonal bipyramids, edges with eight equivalent RuSi4 tetrahedra, and faces with four equivalent USi8 hexagonal bipyramids. All U–Si bond lengths are 3.16 Å. Ru2+ is bonded to four equivalent Si4- atoms to form RuSi4 tetrahedra that share corners with eight equivalent USi8 hexagonal bipyramids, corners with four equivalent RuSi4 tetrahedra, edges with four equivalent USi8 hexagonal bipyramids, and edges with four equivalent RuSi4 tetrahedra. All Ru–Si bond lengths are 2.39 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent U4+, four equivalent Ru2+, and one Si4- atom. The Si–Si bond length is 2.39 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Yb(SiRu)2 by Materials Project

Yb(RuSi)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb3+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Yb–Si bond lengths are 3.25 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of distorted edge and corner-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.38 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Yb3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Ce(SiRu)2 by Materials Project

CeRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce3+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Ce–Si bond lengths are 3.24 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.39 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Ce3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Tb(SiRu)2 by Materials Project

TbRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tb3+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Tb–Si bond lengths are 3.22 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of corner and edge-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.38 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Tb3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on SiRu by Materials Project

RuSi is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ru4+ is bonded in a body-centered cubic geometry to eight equivalent Si4- atoms. All Ru–Si bond lengths are 2.55 Å. Si4- is bonded in a body-centered cubic geometry to eight equivalent Ru4+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Nd(SiRu)2 by Materials Project

NdRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Nd3+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Nd–Si bond lengths are 3.27 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.39 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Nd3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sm(SiRu)2 by Materials Project

SmRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm3+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Sm–Si bond lengths are 3.25 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.39 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Sm3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗