Engineering topics

Wohlen, R. L.

Publications and source records attributed to Wohlen, R. L..

9 records

NASA NTRS1976

Expansion and improvements of the FORMA system for response and load analysis. Volume 1: Programming manual

Techniques are presented for the solution of structural dynamic systems on an electronic digital computer using FORMA (FORTRAN Matrix Analysis). FORMA is a library of subroutines coded in FORTRAN 4 for the efficient solution of structural dynamics problems. These subroutines are in the form of building blocks that can be put together to solve a large variety of structural dynamics problems. The obvious advantage of the building block approach is that programming and checkout time are limited to that required for putting the blocks together in the proper order.

Wohlen, R. L.↗

NASA NTRS1976

Expansion and improvement of the FORMA system for response and load analysis. Volume 2A: Listings, dense FORMA subroutines

A listing of the source deck of each dense FORMA subroutine is given to remove the 'black-box' aura of the subroutines so that the analyst may better understand the detail operations of each subroutine. The FORTRAN 4 programming language is used throughout.

Wohlen, R. L.↗

NASA NTRS1976

Expansion and improvement of the FORMA system for response and load analysis. Volume 2B: Listings, sparse FORMA subroutines

A listing of the source deck of each sparse FORMA subroutine is given to remove the 'black-box' aura of the subroutines so that the analyst may better understand the detailed operations of each subroutine. The format of a sparse matrix on a utility tape is also presented. The FORTRAN 4 programming language is used in all sparse FORMA subroutines.

Wohlen, R. L.↗

NASA NTRS1976

Expansion and improvement of the FORMA system for response and load analysis. Volume 2C: Listings, finite element FORMA subroutines

A listing of the source deck of each finite element FORMA subroutine is given to remove the 'black-box' aura of the subroutines so that the analyst may better understand the detailed operations of each subroutine. The FORTRAN 4 programming language is used in all finite element FORMA subroutines.

Wohlen, R. L.↗

NASA NTRS1976

Expansion and improvement of the FORMA system for response and load analysis. Volume 3A: Explanations, dense FORMA subroutines

An explanation is presented of the function of each dense subroutine in the FORMA library. Example problems are given in some cases to clarify the operations performed by a subroutine.

Wohlen, R. L.↗

NASA NTRS1976

Expansion and improvement of the FORMA system for response and load analysis. Volume 3B: Explanations, sparse FORMA subroutines

An explanation of the function of each sparse subroutine in the FORMA library is presented. Example problems are given in some cases to clarify the operations performed by a subroutine.

Wohlen, R. L.↗

NASA NTRS1976

Expansion and improvement of the FORMA system for response and load analysis. Volume 3C: Explanations, finite element FORMA subroutines

An explanation is presented of the function of each finite element subroutine in the FORMA library. Example problems are given in some cases to clarify the operations performed by a subroutine.

Wohlen, R. L.↗

NASA NTRS1975

Finite element solution of low bond number sloshing

The dynamics of liquid propellant in a low Bond number environment which are critical to the design of spacecraft systems with respect to orbital propellant transfer and attitude control system were investigated. Digital computer programs were developed for the determination of liquid free surface equilibrium shape, lateral slosh natural vibration mode shapes, and frequencies for a liquid in a container of arbitrary axisymmetric shape with surface tension forces the same order of magnitude as acceleration forces. A finite volume element representation of the liquid was used for the vibration analysis. The liquid free surface equilibrium shapes were computed for several tanks at various contact angles and ullage volumes. A configuration was selected for vibration analysis and lateral slosh mode shapes and natural frequencies were obtained. Results are documented.

Wohlen, R. L.↗

NASA NTRS1971

Synthesis of dynamic systems using FORMA: FORTRAN Matrix Analysis. Volume 1: Methodology

Synthesis of structural dynamic systems using digital computer and FORMA(FORTRAN Matrix Analysis)

Wohlen, R. L.↗