The study of the acceleration properties a t the end effector is important in the analysis, design, and control of robot manipulators. I n previous ejTorts aimed a t addressing this problem, the end-effector acceleration has been treated as a vector combining both the linear and ‘angular accelerations. The methodology presented in this article provides characterization:s of these two different ...

Ground reaction force data and tibial accelerations from a skin-mounted transducer were collected during rearfoot running at 3.3 m/s across a force platform. Five repetitive trials from 27 subjects in each of 19 different footwear conditions were evaluated. Ground reaction force as well as tibial acceleration parameters were found to be useful for the evaluation of the cushioning properties of ...

We investigated the influence of vestibular stimulation with different angular accelerations and velocities on the perception of visual motion direction. Constant accelerations resulting in different angular velocities and constant angular velocities obtained at different accelerations were combined in twenty healthy subjects. Random-dot kinematograms with coherently moving pixels and randomly ...

Vision can improve bipedal upright stability during standing and affect spatiotemporal parameters during walking. However, little is known about the effects of visual deprivation on gait dynamic stability. We have tested 28 subjects during walking under two different visual conditions, full vision (FV) and no vision (NV), measuring their upper body accelerations. Lower accelerations were found ...

The objective of the current investigation was to explore whether upper body accelerations obtained during gait provide sensitive measures of postural control in people with Parkinson's disease (PD). Thirteen people with PD (70 ± 11 years) and nineteen age-matched controls (70 ± 7 years) walked continuously for two minutes while wearing three inertial sensors located on their lower back (L5), s...

Useful constraints on the orbits and mass ratios of astrometric binaries in theHipparcos catalog are derived from the measured proper motion differences of Hipparcos and Tycho-2 ( ), accelerations of proper motions (
̇), and second derivatives of proper motions (
̈). It is shown how, in some cases, statistical bounds can be estimated for the masses of the secondary components. Two catalogs of ast...

Manual wheelchair users are subjected to whole-body vibrations (WBV) on a regular basis as they traverse obstacles and uneven surfaces. One way users could protect themselves from secondary injuries related to WBV is by using a suspension manual wheelchair. This study investigated the ability of suspension manual wheelchairs to reduce seat accelerations during curb descents of various heights (...