Accession Number : AD0709078

Title :   A FLOW-DIAGRAM TECHNIQUE FOR TIME-VARYING COORDINATE SYSTEMS.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Bass,C. A.

Report Date : 26 JUN 1970

Pagination or Media Count : 97

Abstract : Time-varying coordinates systems are encountered in a variety of engineering problems, examples being antenna design involving moving platforms, inertial navigation systems, and fire control systems. A flow-diagram technique applied to the study of angular position, velocity, and acceleration and to the externally applied forces and torques required for such motion facilitates problem visualization and provides insight to requirements for position control and methods of isolating the controlled member from the motion of the platform. Kinematic and kinetic problems for rigid-body motion are directly formulated into flow diagrams without intervening mathematical treatment. Simplifications are then performed at the flow-diagram level without concern for the particular problem once it has been put in this form. Both hardware and software methods are then available for directly implementing these flow diagrams. A tutorial approach to rigid-body problems in kinematics and kinetics is adopted for developing the flow-diagram method. Emphasis is placed on problem visualization and ease and flexibility in constructing flow diagrams. Flow diagrams are applied to several two- and three-axis antenna designs. (Author)

Descriptors :   (*KINEMATICS, TRANSFORMATIONS(MATHEMATICS)), INERTIAL NAVIGATION, FIRE CONTROL SYSTEMS, ANTENNAS, SPACE COMMUNICATIONS, POSITION FINDING, TRACKING, SUBROUTINES, VECTOR ANALYSIS

Subject Categories : Numerical Mathematics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE