Keywords : actuators

Sensors & Actuators Conference Series

Ashutosh Tiwari

Advanced Materials Letters, 2017, Volume 8, Issue 6, Pages 678-678
DOI: 10.5185/amlett.2017/6001

International Association of Advanced Materials is pleased to announce Sensors & Actuators Conference Series in Asia, Europe and America with collaboration of VBRI Press AB, Sweden. The conference series are dedicated on the technology and systems in the field of sensors, actuators, microsystems and their developments, and major challenges in research & developments and markets.

Thermally Reduced Graphene oxide/thermoplastic Polyurethane Nanocomposites As Photomechanical Actuators 

M. N. Muralidharan;Seema Ansari

Advanced Materials Letters, 2013, Volume 4, Issue 12, Pages 927-932
DOI: 10.5185/amlett.2013.5474

Optically triggered actuators offer unique advantages like wireless actuation and remote control when comared to other type of actuators. They are extremely useful where stimulus other than electricity or heat is preferred. Thermally reduced graphene oxide (TRGO)/thermoplastic polyurethane (TPU) composite actuators were prepared by simple solution casting technique. The photomechanical actuation properties of the composites were studied under infrared illumination. It was found that the photomechanical response can be tuned by controlling the applied prestrain and the filler loading. Even with a low filler loading of 2 wt. % TRGO, the composite exhibited a very high photomechanical strain of 50.2% with an excellent stress of 1680 kPa at a prestrain of 220%. These high values were achieved at a very low light intensity of 16mWcm -2 . The high values of strain obtained with very good generative forces indicate that this is a promising material for light triggered actuators for many potential applications including robotics and biomedical devices.

Design Of Feedback Controller For Non-minimum Phase nanopositioning System

Sheilza Aggarwal; Maneesha Garg;Akhilesh Swarup

Advanced Materials Letters, 2013, Volume 4, Issue 1, Pages 31-34
DOI: 10.5185/amlett.2013.icnano.217

One of the most important requirement of nanotechnology is precision control and manipulation of devices and materials at nanoscale i.e. nanopositioning. Nanopositioners are precision mechatronic system designed to move objects over a small range with a resolution down to a fraction of an atomic diameter. In particular, desired specifications of any nanopositioners are fast response with no or very little overshoot, large travel range with very high resolution, extremely high precision and high bandwidth. This paper presents design and identification of nanopositioning device consisting of flexure stage, piezoelectric actuator and Linear Variable Differential Transformer (LVDT) as a sensor. Open loop behavior of the nanopositioning device on the basis of time and frequency responses is studied. To improve the system characteristics feedback controllers are used. Step response and frequency response under variety of conditions are obtained to verify the effectiveness of the proposed controllers. In this paper PI and PI2 controllers are designed and system performances are investigated for different values of feedback gain. Unfortunately nanopositioners operating in closed loop achieve high bandwidth at the cost of increased sensitivity to the measurement noise and hence reduced resolution. In this paper H infinity controller is analyzed and performance of the device is studied. Then a comparative study of traditional PI and PI2 controller with H infinity controller on the basis of time and frequency response is given to show which controller is better. Simulation results for the performance analysis are carried out in MATLAB.