NESC0795 SHOCK
SHOCK, Nonlinear Dynamic Structure Analysis, Spring and Mass Model, Runge-Kutta-Gill Method
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| SHOCK | NESC0795/02 | Tested | 08-DEC-1981 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NESC0795/02 | CDC 7600 | CDC 7600 |
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3. DESCRIPTION OF PROBLEM OR FUNCTION
SHOCK calculates the dynamic response of a structure modeled as a spring-mass system having one or two degrees of freedom for each mass when subjected to specified environments. The code determines the behavior of each lumped mass (displacement, velocity, and acceleration for each degree of freedom) and the behavior of each spring or coupling (force, shear, moment, and displacement) as a function of time. Two types of models, axial, having one degree of freedom, and lateral, having two degrees of freedom at each mass can be processed. Damping can be included in all models and shock spectrums of responses can be obtained.
SHOCK calculates the dynamic response of a structure modeled as a spring-mass system having one or two degrees of freedom for each mass when subjected to specified environments. The code determines the behavior of each lumped mass (displacement, velocity, and acceleration for each degree of freedom) and the behavior of each spring or coupling (force, shear, moment, and displacement) as a function of time. Two types of models, axial, having one degree of freedom, and lateral, having two degrees of freedom at each mass can be processed. Damping can be included in all models and shock spectrums of responses can be obtained.
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4. METHOD OF SOLUTION
Two methods of numerical integration of the second-order dynamic equations are provided: the Runge-Kutta-Gill method with variable step-size is recommended for highly nonlinear problems, and a variation of the Newmark-Beta method is available for use with large linear problems.
Two methods of numerical integration of the second-order dynamic equations are provided: the Runge-Kutta-Gill method with variable step-size is recommended for highly nonlinear problems, and a variation of the Newmark-Beta method is available for use with large linear problems.
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6. TYPICAL RUNNING TIME
The time required to process a problem is a function of an integration step which is determined from an estimated maximum frequency existing in the model. Representative times on the CDC6600 are 3 seconds for 1500 steps for a 6 mass lateral problem and 24 seconds for 2000 steps for a 20 mass axial problem.
The time required to process a problem is a function of an integration step which is determined from an estimated maximum frequency existing in the model. Representative times on the CDC6600 are 3 seconds for 1500 steps for a 6 mass lateral problem and 24 seconds for 2000 steps for a 20 mass axial problem.
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NESC0795/02, included references:
- V.K. Gabrielson and R.T. Reese:SHOCK CODE USER'S MANUAL: A Computer Code to Solve the Dynamic
Response of Lumped-Mass Systems. SCL-DR-69-98 (November 1969)
- V.K. Gabrielson:
Supplement to SHOCK Code Report SCL-DR-69-98. SCL-DR-720361 (1/73)
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
The
memory must be preset to zero prior to problem execution. Calls in subroutines SHOK835 and SHSP to local SLL CalComp and SCORS plotting package routines ENDPLOT, EXTFLM, NUMBER, NUMBER3, QUICK, QUICKML, and SYMBOL, not included in the package, are returned by a dummy subroutine supplied by NESC. Appropriate local routines are required to replace these routines for implementation of the program's plotting capabilities. The HOROLOG routine at SLL returns the job time remaining in seconds. The HOROLOG routine in the package returns a constant value of 100 seconds. This, too, should be replaced with the appropriate local routine.
The
memory must be preset to zero prior to problem execution. Calls in subroutines SHOK835 and SHSP to local SLL CalComp and SCORS plotting package routines ENDPLOT, EXTFLM, NUMBER, NUMBER3, QUICK, QUICKML, and SYMBOL, not included in the package, are returned by a dummy subroutine supplied by NESC. Appropriate local routines are required to replace these routines for implementation of the program's plotting capabilities. The HOROLOG routine at SLL returns the job time remaining in seconds. The HOROLOG routine in the package returns a constant value of 100 seconds. This, too, should be replaced with the appropriate local routine.
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NESC0795/02
| File name | File description | Records |
|---|---|---|
| NESC0795_02.001 | FORTRAN SOURCE | 3732 |
| NESC0795_02.002 | UPDATE SOURCE | 3764 |
| NESC0795_02.003 | SAMPLE PROBLEM 1 INPUT | 15 |
| NESC0795_02.004 | SAMPLE PROBLEM 2 INPUT | 55 |
| NESC0795_02.005 | SAMPLE PROBLEM 3 INPUT | 29 |
| NESC0795_02.006 | JCL AND INFORMATION | 48 |
| NESC0795_02.007 | SAMPLE PROBLEM 1 OUTPUT | 350 |
| NESC0795_02.008 | SAMPLE PROBLEM 2 OUTPUT | 1567 |
| NESC0795_02.009 | SAMPLE PROBLEM 3 OUTPUT | 1104 |
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- I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies
Keywords: damping, dynamic loads, equations of motion, mechanics.