Creatures in nature have subtle and complicated interactions with their surrounding fluids, achieving levels of performance as yet unmatched by engineered solutions. Model-free reinforcement learning (MFRL) holds the promise of allowing man-made controllers to take advantage of the subtlety of fluid-body interactions solely using data gathered on the actual system to be controlled. In this thes...

We present dye visualizations of the wake behind a flexible plate flow when its leading edge is forced into harmonic heave motion. We show that, when the forcing amplitude is sufficiently large, a reverse Bénard-von Kármán vortex street is formed in the wake, indicative of the production of positive thrust.

was marked, and gave the impression of a large vessel. In the three boys' cases?aged respectively six, ten and eleven years? nasal obstruction, with enlarged tonsils and adenoids, existed. In one of the boys the pulsation was bilateral and very marked, communicating a heaving impulse to the left tonsil, which was hypertrophied. Connal reminds us that most observers have ascribed the pulsation t...

Wave energy has the advantages of high density, renewability, and wide distribution, been highly valued by many coastal countries. The wave conversion device can convert into electric energy, which is great significance for alleviating problems such as crisis greenhouse effect. traditional only gain along heave direction, kinetic buoy not fully utilized. To improve utilization efficiency device...

During the maintenance of workings, effects soil rock heaving, caused by plastic deformation and extrusion into excavation cavity under action pressure, are usually eliminated. The identified patterns change in stress-strain state coal-rock massifs (displacements, stresses, cracking zones), depending on main mining-geological mining-technical factors will allow to establish optimal parameters a...

This paper explores the nonlinear characteristics of self-excited aerodynamic forces a semi-closed box deck section to perfect theory aeroelastic response analysis. A numerical wind tunnel model was established based on computational fluid dynamics (CFD) method. The heaving-pitching coupled motion is realized by loading user-defined function (UDF) and dynamic grid technology. varying with ampli...