Due to difficulties in real-time measurement of ground motion acceleration and also intrinsic uncertain nature of structural damping, it is assumed that these data are not available for control purposes.
Other key components include the ARM Cortex-M3 microcontroller with a 72MHz CPU (most processing is handled by the host computer, of course), and there are a variety of motion, acceleration and gyroscope sensors on board to help the device follow and compensate for changes in head movement.
A suite of nine ground motion acceleration time history records, representing a wide range of intensity and frequency contents, are selected and used in the study.
A suite of nine-ground motion acceleration time history records, representing a wide range of intensity and frequency contents, is selected and used in the study.
The other smoothness metric we measure is the mean square of the motion acceleration.
These results demonstrate the importance of ground motion acceleration history selection criteria in accurately predicting building limit states.
Motion acceleration is the second order difference of the motion parameter sequence.
In real life, water opposes the motions of ship with forces that depend on the amplitute of motion, the speed of motion, and the acceleration of motion.
In contrast to upper body motion, maximum acceleration of the trunk (i.e., waist and shoulder) did not significantly increase.
This timing is also similar to (i) slowing of India Asia convergence rates between 20 and 11 Ma (Molnar and Stock 2009) and (ii) deceleration of strike slip motion and acceleration of distributed shortening in the northern TP between 18 and 15 Ma (e.g., Ritts et al. 2008).
