NEA-0217 DYNAPS.

DYNAPS, Vibration Analysis of Piping System in Earthquake

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, CPU, FEATURES, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: DYNAPS.

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2. COMPUTERS

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Program name	Package id	Status	Status date
DYNAPS	NEA-0217/01	Tested	01-MAY-1968

Machines used:

Package ID	Orig. computer	Test computer
NEA-0217/01	IBM 7090	IBM 7090

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3. NATURE OF PHYSICAL PROBLEM SOLVED

For the vibration analysis of complicated piping systems, DYNAPS aims to get eigenvalues and mode  of the system. The piping system may have additional masses, supporting springs, supports, hinges and branches and is treated as the combination of simple beams with the assumptions

1) Neglect the effect of an axial force to the flexural rigidity.
2) Neglect the effect of the shearing force and rotating inertia.
3) Neglect the unbalance of the forces (including the gravity    force) caused by the geometric deformation of the system.
4) Neglect all sorts of internal dampings.
5) Neglect the distributed mass for torsional vibration.
6) Assume no coupling between bending, torsional and longitudinal    vibrations, that is the cross-section should be annular.

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4. METHOD OF SOLUTION

The transfer matrix of a whole piping system is calculated by multiplying the transfer matrices of each straight section from one end to the other. Using boundary conditions at both ends, eigenvalues of the piping system are calculated using Holzer iterative method.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

   Number of partial boundaries less than or equal to 10.
   Branch of branch is permitted up to 10 times.
   The characteristics of individual components should be given by the CN cards less than 50.

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6. TYPICAL RUNNING TIME

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS

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9. STATUS

Package ID	Status date	Status
NEA-0217/01	01-MAY-1968	Tested at NEADB

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10. REFERENCES

NEA-0217/01, included references:

- H. Shibata, S. Fujii, M. Iguchi, H. Sato:
  Theoretical Foundations for the Design of Earthquake Resistant
  Mechanical Structures
  Presented to the IAEA Panel Discussion Meeting on Aseismic Design
  and Testing of Nuclear Facilities (June 1967)

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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0217/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: IBJOB.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

         H. Shibata and H. Sato
         Institute of Industrial Science
         University of Tokyo
         22-1, Roppongi 7
         Minato, Tokyo
         Japan

         S. Fujii and M. Iguchi
         Mechanical Engineering for Production
         Faculty of Engineering
         University of Tokyo
         3-1, Hongo 7
         Bunkyo, Tokyo
         Japan

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16. MATERIAL AVAILABLE

NEA-0217/01