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Book, Wayne J.

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    Steerability in Planar Dissipative Passive Robots
    (Georgia Institute of Technology, 2009) Gao, Dalong ; Book, Wayne J.
    Steerability is intuitively the ability to change directions. In this paper, a formal definition is given for the steerability of a robot achieved either passively or actively. A dissipative passive robot uses only passive actuators such as brakes and clutches (a clutch is essentially a brake plus a gearbox) to redirect or steer operator-imposed motion by dissipating energy. While it has safety and ergonomic advantages, which are essential for human interactions, it also has difficulties in redirecting certain motions since passive actuators cannot add energy. The force generated from a passive actuator is used to measure the steerability. A steerability theorem was then developed for a manipulator with generalized passive actuators. The steerability analysis for an example diamond-shaped manipulator shows the difference in steerability when using only brakes or a combination of brakes and clutches. Further analyses show the difference comes from the ability of a clutch to change the direction of the generated force in the subject robot by altering the effective gear ratios
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    Speed Control and Position Estimation of Small Hydraulic Cylinders for Digital Clay Using PWM Method
    (Georgia Institute of Technology, 2004-07) Zhu, Haihong ; Book, Wayne J.
    Digital Clay is a new generation 3D computer input and output device for surface shape and haptic effects. The device consists of arrays of fluidically actuated cells under the control of valves connected to two pressure reservoirs in a manner ultimately suitable to an implementation in MEMS technology. At the current stage, it is very difficult to implement a tiny position sensor into the tiny cell. This paper presents a control method for the speed and position estimation and control for the cells of digital clay only using low cost pressure sensors and without using any position-sensing device.
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    Robot vibrations
    (Georgia Institute of Technology, 2001) Book, Wayne J.
    The nature of robotic arms invites vibratory behavior while the function of robotic arms is heavily penalized by that vibration. Consequently, understanding and compensating for the tendencies of a robot to vibrate are of great importance. Robotic vehicles have less tendency to vibrate, although mounting an arm on a vehicle introduces new sources of excitation and compliance and new penalties for the simple solution to vibration, that is, adding mass to rigidize the arm structure