Inderjit Chopra

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This paper investigates the behavior of piezoelectric elements as strain sensors. Strain is measured in terms of the charge generated by the element as a result of the direct piezoelectric effect. Strain measurements from piezoceramic (PZT) and piezofilm (PVDF) sensors are compared with strains from a conventional foil strain gage and the advantages of each(More)
Title of dissertation: HOVER AND WIND-TUNNEL TESTING OF SHROUDED ROTORS FOR IMPROVED MICRO AIR VEHICLE DESIGN Jason L. Pereira Doctor of Philosophy, 2008 Dissertation directed by: Professor Inderjit Chopra Department of Aerospace Engineering The shrouded-rotor configuration has emerged as the most popular choice for rotary-wing Micro Air Vehicles (MAVs),(More)
Title of thesis: OPEN LOOP SYSTEM IDENTIFICATION OF A MICRO QUADROTOR HELICOPTER FROM CLOSED LOOP DATA Derek Scott Miller, Master of Science, 2011 Thesis directed by: Professor J. Sean Humbert Department of Aerospace Engineering Quadrotors are a favorite platform amongst academic researchers. Yet there is limited work present on the identification of Linear(More)
Title of dissertation: DYNAMICS AND AEROELASTICITY OF HOVER CAPABLE FLAPPING WINGS: EXPERIMENTS AND ANALYSIS Beerinder Singh, Doctor of Philosophy, 2006 Dissertation directed by: Professor Inderjit Chopra Department of Aerospace Engineering This dissertation addresses the aerodynamics of insect-based, bio-inspired, flapping wings in hover. An experimental(More)
Ground effect on hovering rotor performance has been widely studied both experimentally and theoretically, yet most applications have focused on global thrust and power values. Motivated by the Sikorsky Human Powered Helicopter Challenge (HPH), an attempt to further study ground influence on a hovering rotor of highly elastic blades in extreme ground(More)
A new solution for the SLAM problem is presented which makes use of a scan matching algorithm, and does not rely on bayesian filters. The virtual map is represented in the form of an occupancy grid, which stores laser scans based on the estimated position. The occupancy grid is scanned by means of ray casting to get a scan of the virtual world, called(More)
This paper presents the status and progress of the ongoing work directed towards the development and implementation of autonomous navigation algorithms for Micro Aerial Vehicles (MAV). The method proposed is founded on a mapping methodology, which is supported by a laser scan matching algorithm and virtual occupancy grid method. Navigation and path planning(More)
Rotor hover performance can be enhanced by enclosing it in a shroud. This paper describes the design and testing of a quad rotor vehicle with a shroud structure incorporated, and the resulting improvements in aerodynamic efficiency over a conventional micro quad rotor are demonstrated. Parametric studies were conducted to study the effect of number of(More)
Title of Dissertation: QUASI–STATIC ACOUSTIC MAPPING OF HELICOPTER BLADE-VORTEX INTERACTION NOISE Gaurav Gopalan, Doctor of Philosophy, 2004 Dissertation directed by: Martin Professor Fredric H. Schmitz Department of Aerospace Engineering This research extends the applicability of storage-based noise prediction techniques to slowly maneuvering flight. The(More)