Bilji C Mathew
Bio: Bilji C Mathew is an academic researcher from Lovely Professional University. The author has contributed to research in topics: Airfoil & Aerodynamics. The author has an hindex of 1, co-authored 8 publications receiving 2 citations.
••01 Jun 2021
TL;DR: In this paper, the authors focused on the aerospace uses of compliant mechanisms likebistable monolithic devices, deployable arrays by figuring out the origami oblivion applications, temporary or permanent structures, and mainly focused on Aerospace Applications.
Abstract: It is 2021 of the 21st century, the world is already shifting dramatically towards complex machinery and procedures. A Compliant mechanism can help to make things simpler and elegant by decreasing the member elements in the machinery. We use flexure joints and simple members to perform operations. We focused on the aerospace uses of compliant mechanisms likebistable monolithic devices, deployable arrays by figuring out the origami oblivion applications, temporary or permanent structures, and mainly focused on Aerospace Applications. Well, looking for a more sustainable approach to the current space applications and planetary technologies that can behold the promises of primary mission goals. We mostly rely on rigid mechanisms for performing motions and transmission, here we showcase the actual science behind the flexible deformations lead to easier, cheap, and less complexity to the mechanism. The global sustainability part is considered in this paper while designing and material the components. The thickness of the material brings the mathematical models into the picture by which the origami is structure is formed and graphs analysisshows the compliant motions of the structure.
••01 Jun 2021
TL;DR: In this paper, a review sheds light on the traits behind an albatross's aerodynamic efficiency such as dynamic soaring, bell shaped lift distribution and provides insights into its hereditary posed encodings and evolutions.
Abstract: The aerodynamic efficiency of the albatross has always fascinated researchers and the designing of drones mimicking the albatross's aerodynamic traits have been a major area of interest for the aerospace industry. This review sheds light on the traits behind an albatross's aerodynamic efficiency such as dynamic soaring, bell shaped lift distribution and provides insights into its hereditary posed encodings and evolutions. The soaring techniques have been introduced and discussed along with the albatross's morphology and structure which is responsible for its efficiency. In addition, the albatross's navigational and foraging strategies are briefly discussed to provide a better understanding of the effects of atmospheric conditions on the albatross's flight characteristics and the limitations.
01 Dec 2020
TL;DR: In this article, an airfoil incorporated with a mechanism to provide negative camber is studied in detail and simulation has been performed to note the differences and lift generation from that wing.
Abstract: Modern day aerospace engineering is enabling us with new innovative methods to overcome he existing challenges faced by the aircrafts at higher altitude. Camber morphing of wing is a concept to increase the lift significantly while eliminating the use of flaps. The new smooth surface design will eliminate or reduce the drag and will upsurge maneuverability along with fuel efficiency. Wings are crucial part for an aerodynamic flight, the shape and mechanism incorporated in the wing directly affects the lift generation. an airfoil incorporated with a mechanism to provide negative camber is studied in detail. Analysis and simulation has been performed to note the differences and lift generation from that wing. Changing shape of the wing at different flight conditions has been studied and a model was designed in CATIA V5. Theoretical and experimental values are compared and aerodynamic performance is analyzed.
TL;DR: In this article , the simulation and analysis of the vibration level of rotor blades is presented to reduce the vibration caused by rotational motion of the main rotor blades and the tail rotor.
Abstract: Abstract: Vibration has always been a major disturbance for helicopter. Vibrations, thus, a threat to components of helicopter. The vibration created by a helicopter draws a great contribution to the reduction in life of the components. Reducing the vibration that creates from helicopter rotor blades, tail rotors is a one step closer to this crisis. Helicopter Vibration control is a topic of research into designing helicopter rotor blade which can be operated more efficiently. The major source of the vibration come from the rotor blade rotation. By trying to upgrade new design in the helicopter main rotor blades and tail rotors reduce the vibration and make the operation more efficient. This paper addresses simulation and analysis of vibration level of rotor blades. Keywords: drag, rotor, vibration, air foil, blade profile.
TL;DR: In this article , a visual and iterative approach to eliminate redundant constraints in origami-based mecha-nisms through joint removal is presented. But this approach is not suitable for large-scale systems.
Abstract: Origami patterns have been used in the design of deploy- able arrays. In engineering applications, paper creases are often replaced with surrogate folds by providing a hinge-like function to enable motion. Overconstraint ob- served in multi-vertex origami patterns combined with imperfect manufacturing may cause the resulting mech- anisms to bind. The removal of redundant constraints de- creases the likelihood of binding, may simplify the over- all system, and may decrease the actuation force by re- ducing friction and other resistance to motion. This pa- per introduces a visual and iterative approach to elim- inating redundant constraints in origami-based mecha- nisms through joint removal. Several techniques for joint removal are outlined and illustrated to reduce overcon- straints in origami arrays.
TL;DR: In this article , an approach using moving end-constrained spline (ECS) curves with variable widths is presented for the explicit topology optimization of compliant mechanisms.
Abstract: In this study, an approach using moving end-constrained spline (ECS) curves with variable widths is presented for the explicit topology optimization of compliant mechanisms. The proposed approach uses a series of spline curves to represent the topology of the compliant mechanism. Instead of using a fixed width, we let the width of such spline curves vary along the curve. The optimized design is obtained by optimizing the width of the spline curves and the position of the control points. To avoid infeasible solutions in the design process, the end points of several specific spline curves are constrained according to the design region. The validity of the proposed method is demonstrated using different types of splines, such as the Bézier curve and B-spline curve, for the design of a force inverter, a compliant gripper and a compliant orthogonal displacement amplification mechanism.
01 May 2007
TL;DR: In this article, the aerodynamic interference effects on tiltrotor performance in cruise were investigated using comprehensive calculations, to better understand the physics and to quantify the effects on the aircraft design.
Abstract: Abstract : The aerodynamic interference effects on tiltrotor performance in cruise are investigated using comprehensive calculations, to better understand the physics and to quantify the effects on the aircraft design. Performance calculations were conducted for 146,600-lb conventional and quad tiltrotors, which are to cruise at 300 knots at 4000 ft/95 deg F condition. A parametric study was conducted to understand the effects of design parameters on the performance of the aircraft. Aerodynamic interference improves the aircraft lift-to-drag ratio of the baseline conventional tiltrotor. However, interference degrades the aircraft performance of the baseline quad tiltrotor, due mostly to the unfavorable effects from the front wing to the rear wing. A reduction of rotor tip speed increased the aircraft lift-to-drag ratio the most among the design parameters investigated.
06 Apr 2018
TL;DR: In this paper , the authors derived the application of bionic technology and the integration of green energy innovation through systematic innovation theory, designing the operation of UAVs using this research method.
Abstract: This study aims to improve the two major problems faced by UAVs, short battery life and difficulty detecting hovering, respectively. For the problems mentioned above, this study derives the application of bionic technology and the integration of green energy innovation through systematic innovation theory, designing the operation of UAVs using this research method. The scope includes research on bionic technology, systematic innovation, innovation of unmanned aerial vehicles, and conduct fluid analysis for the output results, watching to confirm the hovering state, and analyzing the battery life to ensure the improvement of power supply, the output, and verification of this research can significantly improve the future development and application of UAVs.