Insect wings are deformable structures that change shape passively and dynamically owing to inertial and aerodynamic forces during flight. It is still unclear how the three-dimensional and passive change of wing kinematics owing to inherent wing flexibility contributes to unsteady aerodynamics and energetics in insect flapping flight. Here, we perform a systematic fluid-structure interaction ba...

The paper presents the modeling of nonlinear longitudinal aerodynamics using flight data of Hansa-3 aircraft at high angles of attack near stall. The Kirchhoff’s quasi-steady stall model has been used to incorporate nonlinear aerodynamic effects in the aerodynamic model used to estimate the parameters, thereby, making the aerodynamic model nonlinear. The Maximum Likelihood method has been appli...

In current design practice, the dynamic wind loads are described in terms of the equivalent static wind loads based on the gust response factor. This approach results in a distribution of the equivalent static loading similar to the mean static wind load distribution, which may not always be a physically meaningful and realistic load description. In this paper, the equivalent static load repres...

A method for accurately measuring the drag associated with a protuberance on an aircraft has been devised and implemented in a wind tunnel using a C-130 model. The C-130 aircraft has been heavily modified for various different configurations and the impact that these modifications have had on the aerodynamic performance of the aircraft has not been well documented. This paper describes a method...

Abstract A cable-driven model support concept is suggested and implemented in this paper. In case, it a cable suspension balance system (CSBS), which has the advantages of low interference reduced vibration responses for effective wind tunnel tests. This designed both motion control aerodynamic load measurements. CSBS, required position or attitude test realized by eight motors, adjust length, ...

Composite materials allow to tailor the elastic properties of a structure. In aeroelasticity, this opens up possibility passively enhance coupled aerostructural characteristics. work, design composite wing is addressed with aim alleviate static and dynamic aeroelastic loads; these two objectives are quantified by root-bending-moment in high load-factor condition deformation amplitude under gust...

Swirling flow with the formation of a precessing vortex core (PVC) in draft tube model hydroturbine was studied. Experiments were performed on an aerodynamic setup under transient operating conditions hydroturbine. The turbine varied by continuously changing rate at constant runner speed. transition from partial load regime, when is formed, to best efficiency point without considered. Applied t...

Turning is crucial for animals, particularly during predator-prey interactions and to avoid obstacles. For flying animals, turning consists of changes in (i) flight trajectory, or path of travel, and (ii) body orientation, or 3D angular position. Changes in flight trajectory can only be achieved by modulating aerodynamic forces relative to gravity. How birds coordinate aerodynamic force product...