Computer program accurately predicts impact response of previously designed disc-type Mars prototype landing vehicle. Program may be used in any design area where energy dissipation is considered

Knoell, A. C.

Patton, R. H.

English

NASA Technical Reports Server

December 1971	 Brief 71-10472 
NASA TECH BRIEF 
NASA Pasadena Office
	
- 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield; Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D. C. 20546. 
Landing Dynamics Program for mi pact Attenuating Vehicles (LANDIT) 
The problem:	 of mechanical energy dissipated are also provided. 
To predict the dynamic landing response charac- 	 Although developed mainly as a design tool in 
teristics of axisymmetric impact attenuating vehicles	 the structural design of lunar or planetary hard-
that consist of a rigid payload and a crushable im- 	 landing vehicles, the program may be utilized in any 
pact limiter system.	 design area where energy dissipation is a considera-
The solution:
	 tion. 
A digital computer program, LANDIT. The pro- Notes: 
gram has been used to successfully predict the im-
	
1. This program is written in FORTRAN IV (87%) 
pact response of a previously designed disc-type
	
and MAP (13%) for use on the IBM-7094 corn-
Mars prototype landing vehicle.
	
puter. 
How it's done:
	
2. Requests for further information may be directed 
The program is based on the solution of a planar
	
to: 
cosmic 
landing dynamics problem. The vehicular degrees-
	 112 Barrow Hall 
of-freedom consist of the horizontal and vertical
	 University of Georgia 
displacements of the gravity center relative to the
	 Athens, Georgia 30601 
impact surface and the rotation of the vehicle about
	 Reference: B71-10472 
the center of gravity in the plane of the admissible 
displacements. The solution is developed by numeri- Patent status: 
cally solving a set of three nonlinear differential
	
No patent action is contemplated by NASA. 
equations of motion. 	 Source: R.H. Patton and A.C. Knoell of 
LANDIT performs the computations and provides
	 Caltech/JPL 
an output consisting of a set of vehicle CG dis-
	 under contract to 
placement, velocity, and acceleration-time histories of
	 NASA Pasadena Office 
the impact event. Continuous data regarding the
	 (NPO-10840)
magnitude of the crushing force and the amount
Category 09 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19710000469 2020-03-17T02:25:30+00:00Z


Landing dynamics program for impact attenuating vehicles /LANDIT/

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