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Flight kinematics of the miniature parasitoid wasp Megaphragma amalphitanumтезисы доклада
- Авторы: Lapina N., Farisenkov S., Polilov A.
- Сборник: Book of Abstracts of XXVI International Congress of Entomology (Helsinki, Finland, July 17-22, 2022)
- Тезисы
- Год издания: 2022
- Первая страница: 624
- Аннотация: The study of insect flight is a large area of modern entomology, closely related to biomechanics and aerodynamics. Studying the flight of micro insects is a technically difficult task. Most work in this area has been done during the last few years. Our group recentlyaccurately described the morphological and kinematic adaptations to flight at low Reynolds numbers in the miniature beetle Paratuposa placentis. Microinsects are a polyphyletic group, but many of them have acquiredsimilar adaptations to flight at low Reynolds numbers, such as the bristled wings found in most flying microinsects. However, there are important differences in the details of structure of their wing apparatuses, which probably affect the mechanics of flight. Some of the smallest body sizes among flying insects are found among parasitic wasps of the family Trichogrammatidae. The body length of one of the smallest species of this family, Megaphragma amalphitanum, is only about 250 μm.We designed an experimental setup that made it possible to perform macro video recording of the flight of M. amalphitanum using four synchronized high-speed cameras. We reconstructed the kinematics of the flight using frameby-frame triangulation of landmarks on the wing and body. The averaged wing cycle and pitch oscillations of the body were mathematically described in the system of Euler angles. The angles of attack speed of the wings at all stages of the wing cycle, and Reynolds numbers were calculated. Additionally, we reconstructed the flight trajectories of the wasps in spacious boxes and calculated flight speeds and accelerations. M. amalphitanum is capable of active flapping flight at considerable speeds up to 1000 body lengths per second: average and maximum flight velocity are 0.06 and 0.25 m/s, respectively; maximum acceleration is 4.19 m/s2. The average Reynolds number during the wing cycle is about 3, which means that viscous friction forces are prevalent, and the leakiness between the bristles must be quite low. During both translations, the angle of attack and wing velocity are high: 50 degrees and 0.12 m/s during the downstroke and 80 degrees and 0.27 m/s during the upstroke. During the recovery stroke between downstroke and upstroke, the wings clap and move slowly at near-zero angles of attack, which apparently reduce the unwanted drag of the wings. Stroke amplitude is 140 degrees. Pitch angle reaches its minimum value at the end of translational phase of the upstroke (2 degrees). The maximum angle of attack is reached by the end of the recovery stroke (50 degrees). Deviation angle varies from 17 degrees during the downstroke to 125 degreesduring the upstroke. Wingbeat frequency is 276 Hz. The estimated aerodynamic features revealed in our study and unusual kinematics of the operation of the microwasp wings are an important adaptation to flight at ultra-low Reynolds numbers, under conditions of prevalent viscous friction forces. This study has been supported by the Russian Foundation for Basic Research (project no. 22-74-10010).
- Добавил в систему: Полилов Алексей Алексеевич