![]() The objective of the present study is to investigate the influence of the following kinematic parameters on the flight performance of inclined stroke plane hovering: Reynolds number (Re), stroke amplitude, wing rotational timing and rotational duration. The incompressible Navier–Stokes equations are discretized and solved on a non-body confirming Cartesian grid the concept of immersed boundary method is made use of to impose the no-slip boundary condition on the surface of the wing. The unsteady flow structure and the time-varying aerodynamic forces acting on a 2D dragonfly model wing are studied by numerically solving the Navier–Stokes equations. By the way, we found the rigidity of tail wing is crucial and should be enhanced to prevent the flapping-wing MAV will be unable to revise if the MAV in a crooked condition and it will cause a crash. The actual flight distance is approximately 8 m, and the primary goal is achieved. A simple flight test was carried out and the result of the flight is going well. The power source comes from motor with a Li–H battery. The flapping frequency of wing is 25.58 Hz. The angles of upstroke and downstroke can be varied in the design. In this vehicle, we employed the concept of four-bar linkage to design a flapping mechanism which simulates the flapping motion of a bird. The specifications of flapping wing MAV are 8 g gross weight, the 15 cm wingspan, and 5 cm chord length. Second is to average lift force, 8.78 g for designing weight limit of the MAV. Analyzing the flapping wing under different frequencies and angles of attack, investigates the pressure distribution, the airfoil-tip vortex and the up-wash situation of the air flow. First, the 3D aerodynamic calculation and flow field simulation of a planar membrane wing as shape airfoil for a MAV were studied. This simulation calculates the average lift force, as the criteria weight of the flapping wing (weight must be lower than 8.78 g), to make one ultra-light, small size flapping wing MAV. ![]() This paper presents the design and aerodynamic performance of a planar membrane wing as shape airfoil for the micro aerial vehicle. Furthermore the correlation among the near-and far-field flow features, the aerodynamic force production, and the wing kinematics is highlighted. Computational results of four typical insects in hovering flight including a thrips, a fruitfly, a honeybee, and a hawkmoth over a wide range of Reynolds numbers from O(101) to O(104) are presented. ![]() In this study, a computational study of such size effects on insect hovering aerodynamics is conducted, which is performed using an integrated numerical framework consisting of the modeling of realistic wing-body morphology, the modeling of flapping-wing and body kinematics, and an in-house Navier-Stokes solver. Understanding of sizing or Reynolds numbers effects in hovering flights on the aerodynamics is not only of interest to the micro-air-vehicle ommunity but also of importance to comparative morphologists. In particular, hovering is a miracle of insects that can be seen for most of sizes of flying insects. działającego egzemplarza entomoptera, którego budowę wzorowano na mikrorobocie „DragonFly”.įlapping flyers showcase excellent flight performances under many flight environments. Zwrócono uwagę na cechy konstrukcyjne głównych zespołów entomoptera istotne z punktu widzenia nadania pożądanych własności lotnych. W niniejszej pracy skupiono się na badaniu możliwości budowy entomoptera przy wykorzystaniu łatwo dostępnych i relatywnie tanich podzespołów oraz materiałów. Badania mikro-aparatów bezzałogowych w układzie entomoptera należy uznać za potrzebne, ponieważ otwierają potencjalnie nowe pole zastosowań aparatów latających, do których zaliczają się loty w zamkniętych bądź ograniczonych przestrzeniach (budynki, tunele czy obszary leśne), nierzadko wypełnionych przeszkodami. Niewielkie rozmiary oraz fakt zastosowania ruchomych skrzydeł jako napędu nadaje tego rodzaju urządzeniom możliwość wykonania lotu i swobodę manewrowania przy małych prędkościach lotu (rzędu 0 - 5 m/s). Entomoptery, czyli aparaty latające naśladujące lot owadów są obecnie niszową i rozwijającą się kategorią bezzałogowych aparatów latających.
0 Comments
Leave a Reply. |