Motion of a system in which each of the coordinates undergoes simple periodic motion, but the associated frequencies are not all rational fractions of each other so that the complete motion is not simply periodic. 
Motion of a system in which each of the coordinates undergoes simple periodic motion, but the associated frequencies are not all rational fractions of each other so that the complete motion is not simply periodic. 
Related Terms 
CONTROL SPILLOVERThe excitation by an active control system of modes of motion that have been omitted from the control algorithm in the process of model reduction. 
NORMAL COORDINATESA set of coordinates for a coupled system such that the equations of motion each involve only one of these coordinates. 
NEWTONIAN MECHANICSThe system of mechanics based upon Newton's laws of motion in which mass and energy are considered as separate, conservative, mechanical properties, in contrast to their treatment in relativistic mechanics. 
NONINTEGRABLE SYSTEMA dynamical system whose motion is governed by an equation that is not an integrable differential equation. 
ABERRATION

MODEL REDUCTIONThe process of discarding certain modes of motion while retaining others in the model used by an active control system, in order that the control system can compute control commands with sufficient rapidity. 
GIMBALLING ERRORThat error introduced in a gyrocompass by the tilting of the gimbal mounting system of the compass due to horizontal acceleration caused by motion of the vessel, such as rolling. 
VALVE LIFTERSometimes called a 'cam follower', a component in engine designs that use a linkage system between a cam and the valve it operates. The lifter typically translates the rotational motion of the cam to a reciprocating linear motion in the linkage system. 
CORIOLIS CORRECTION

AIDED TRACKINGA system of radartracking a target signal in bearing, elevation, or range, or any combination of these variables, in which the rate of motion of the tracking equipment is machinecontrolled in collaboration with an operator so as to minimize tracking error. 
MarineProHelp 2018  2020