Low-Cost Electromechanical Actuator Arrays for Tactile Display Applications

2018 ◽  
Author(s):  
Michael Karpelson ◽  
Rut Pena ◽  
Robert J. Wood
Keyword(s):  
Low Cost ◽  
Tactile Display ◽  
Electromechanical Actuator ◽  
Actuator Arrays

Tactile Display for Virtual Shape Rendering Based on Servo Actuated Modules

2015 ◽  
Author(s):  
Alessandro Mansutti ◽  
Mario Covarrubias Rodriguez ◽  
Monica Bordegoni ◽  
Umberto Cugini
Keyword(s):  
Degrees Of Freedom ◽  
Low Cost ◽  
Tactile Display ◽  
Elastic Behaviour ◽  
Maximum Point ◽  
Surface Rendering ◽  
Aesthetic Quality ◽  
High Performing ◽  
Manual Exploration ◽  
The Aesthetic

This paper presents a new concept of a desktop tangible shape display for virtual surface rendering. The proposed system is able to represent in the real environment the shape of a digital model of a product, which can be explored naturally through a free-hand interaction. Aim of the shape display is to allow product designers to explore the rendered surface through a continuous touch of curves lying on the product shape. Ideally, the designer selects curves, which can be considered as style features of the shape, on the shape surface, and evaluates the aesthetic quality of these curves by manual exploration. In order to physically represent these selected curves, a flexible surface is modelled by means of servo-actuated modules controlling a physical deforming strip. The behaviour of the strip is controlled by acting on the position and rotations of a discrete number of control sectors. Each control sector is controlled by a module, which is based on an absolute positioning approach and equipped with five degrees of freedom. The developed system is able to manage the elastic behaviour of the strip in terms of bending, twisting and local tangency. The tangency control allows us to manage the local tangency of the strip to the rendered trajectory, thus increasing the accuracy of the representation. Moreover, a preliminary second version of the module is presented, which has been designed so as to allow the control sectors to slide on the strip. Thanks to this feature, it will be possible to place the control sector in a given point of the trajectory, such as point of maximum, point of minimum or inflection points. The device is designed to be portable, low cost, modular and high performing in terms of types of shapes that can be represented. A prototype equipped with three modules has been developed in order to evaluate the usability and the performances of the display.

Electromechanical Actuator Controller Design with Optical Encoder Feedback

2011 ◽  
Vol 383-390 ◽  
pp. 1166-1173 ◽  
Author(s):  
Xiao Ming Liu ◽  
Wan Chun Chen ◽  
Xing Liang Yin ◽  
Xiao Lan Xing
Keyword(s):  
Controller Design ◽  
Low Cost ◽  
Simple Algorithm ◽  
Velocity Estimation ◽  
Estimation Methods ◽  
Optical Encoder ◽  
Electromechanical Actuator ◽  
Loop Control ◽  
Least Squares Fit ◽  
Close Loop Control

In this paper we propose a control scheme of electromechanical actuator with optical encoder feedback. Controlled object is the simplified model of a DC motor while feedback device is an optical encoder. Encoder model is established after analyzing its principle and signal characteristic. Many velocity estimation methods have been compared and the least squares fit filter is selected for our design because of its simple algorithm and capability of predicting velocity and position. Using these predictions as feedback, a variable structure controller based on exponential approach law is adopted in the actuator close-loop control. The relationship between system performance and encoder resolution is exposed. This scheme can be implemented easily with low cost and convenient interface. Its validity is proved by simulation results.

2904 An experimental tactile display using micro actuator arrays

2005 ◽  
Vol 2005.4 (0) ◽  
pp. 269-270
Author(s):  
Masahiro OHKA ◽  
Takehiro FUJIWARA ◽  
Shiho MATSUKAWA ◽  
Keitaro KATO ◽  
Yasunaga MITSUYA
Keyword(s):  
Tactile Display ◽  
Micro Actuator ◽  
Actuator Arrays

2P1-N05 Development of Tactile Display Using Large Displacement MEMS Actuator Arrays(VR and Interface)

2012 ◽  
Vol 2012 (0) ◽  
pp. _2P1-N05_1-_2P1-N05_2
Author(s):  
Junpei Watanabe ◽  
Hiroaki Ishikawa ◽  
Xavier Arouette ◽  
Yasuaki Matsumoto ◽  
Norihisa Miki
Keyword(s):  
Tactile Display ◽  
Large Displacement ◽  
Actuator Arrays

scholarly journals Toward Low-Cost Highly Portable Tactile Displays with Shape Memory Alloys

2007 ◽  
Vol 4 (2) ◽  
pp. 57-70 ◽  
Author(s):  
R. Velázquez ◽  
E. E. Pissaloux ◽  
M. Hafez ◽  
J. Szewczyk
Keyword(s):  
Shape Memory ◽  
Active Element ◽  
Low Cost ◽  
Tactile Display ◽  
Helical Springs ◽  
Niti Sma ◽  
Air Convection ◽  
Tactile Displays ◽  
Forced Air ◽  
Visually Disabled

This paper presents a new concept of low-cost, high-resolution, lightweight, compact and highly portable tactile display. The prototype consists of an array of 8 × 8 upward/downward independent moveable pins based on shape memory alloy (SMA) technology. Each tactile actuator consists of an antagonist arranged pair of miniature NiTi SMA helical springs capable of developing a 300 mN pull force at 1.5 Hz bandwidth by using simple forced-air convection. The proposed concept allows the development of 200 g weight tactile instruments of compact dimensions which can be easily carried by a visually disabled user. A detailed technical description of the SMA active element, tactile actuator and tactile display is presented and discussed. Preliminary perceptual results confirm the effectiveness of the display on information transmission.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Chromic Acid Etching of Polyethylene

1973 ◽  
Vol 31 ◽  
pp. 72-73
Author(s):  
J. D. Muzzy ◽  
R. D. Hester ◽  
J. L. Hubbard
Keyword(s):  
Chromic Acid ◽  
Low Cost ◽  
Acid Etching ◽  
Crystalline Morphology ◽  
Bulk Specimen ◽  
Morphological Studies ◽  
Perfect Form ◽  
Molecular Length ◽  
Lamellar Texture ◽  
Cost Studies

Polyethylene is one of the most important plastics produced today because of its good physical properties, ease of fabrication and low cost. Studies to improve the properties of polyethylene are leading to an understanding of its crystalline morphology. Polyethylene crystallized by evaporation from dilute solutions consists of thin crystals called lamellae. The polyethylene molecules are parallel to the thickness of the lamellae and are folded since the thickness of the lamellae is much less than the molecular length. This lamellar texture persists in less perfect form in polyethylene crystallized from the melt.Morphological studies of melt crystallized polyethylene have been limited due to the difficulty of isolating the microstructure from the bulk specimen without destroying or deforming it.

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