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Book, Wayne J.

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Author: Zhu, Haihong × End date: 2009 × Start date: 2000 ×

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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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    Control concepts for digital clay
    (Georgia Institute of Technology, 2003-09) Zhu, Haihong ; Book, Wayne J.
    Digital Clay is a new generation of 3D computer input and output device for surface shape. Its three control levels are introduced in this paper. The device consists of arrays of fluidically actuated cells under the control of valves, that are connected to two pressure reservoirs in a manner ultimately suitable to an implementation in MEMS technology. Preliminary research on control related behaviour is described including testing of a single cell under a proposed control scheme. Based on these tests, control methods are presented and discussed that achieve elastic, plastic and elastic-plastic material behaviours.
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    Finger Sculpting with Digital Clay: 3D Shape Input and Output through a Computer-Controlled Real Surface
    (Georgia Institute of Technology, 2003) Book, Wayne J. ; Glezer, Ari ; Ebert-Uphoff, Imme ; Shaw, Christopher D. ; Rossignac, Jarek ; Allen, Mark G. ; Rosen, David W. ; Askins, Stephen Alexander ; Bai, Jing ; Bosscher, Paul Michael ; Gargus, Joshua ; Kim, Byungmoon ; Llamas, Ignacio ; Nguyen, Austina Nga ; Yuan, Guang ; Zhu, Haihong
    The NSF Digital Clay project is focused on the design, prototyping, integration, and validation of a computer-controlled physical device capable of taking any of a wide range of possible shapes in response to changes in a digital 3D model or to changes in the pressure exercised upon it by human hands. Although it clearly is a natural and unavoidable evolution of 3D graphical user interfaces, its unprecedented capabilities constitute a major leap in technologies and paradigms for 3D display, for 3D input, and for collaborative 3D design. In this paper, we provide an overview of the Digital Clay project and discuss the challenges, design choices, and initial solutions for a new Finger Sculpting interface designed for the Digital Clay and prototyped using conventional 3D I/O hardware.