The fatigue life prediction for offshore wind turbine support structures is computationally demanding, requiring the consideration of a large number combinations environmental conditions and load cases. In this study, efficient methodology combining aerodynamic decoupling modal reduction techniques developed prediction. Aerodynamic implemented to separate structure rotor-nacelle assembly. rotor...

This paper examines feasibility and performance issues in using Control Moment Gyroscopes (CMGs) to control the attitude of a fixed-wing aircraft. The paper describes a control system structure that permits allocating control authority and bandwidth between a CMG system and conventional aerodynamic control surfaces to stabilize a vehicle with neutral aerodynamic stability. A simulation study ex...

Noise barriers need to be installed along high-speed railway lines protect nearby inhabitants from the noise pollution caused by running of trains (HSTs). The vertical barrier is main structural type. However, when an HST passes through sited track, significant and transient aerodynamic pressure will act on surface barriers, resulting in strong dynamic responses even fatigue damage. Therefore, ...

Recent work on the aerodynamics of flapping flight reveals fundamental differences in the mechanisms of aerodynamic force generation between fixed and flapping wings. When fixed wings translate at high angles of attack, they periodically generate and shed leading and trailing edge vortices as reflected in their fluctuating aerodynamic force traces and associated flow visualization. In contrast,...

BACKGROUND Mild hyperhomocysteinemia is independently associated with an increased risk of cardiovascular disease. Air pollution exposure induces short-term inflammatory changes that may determine hyperhomocysteinemia, particularly in the presence of a preexisting proinflammatory status such as that found in cigarette smokers. OBJECTIVE We examined the relation of air pollution levels with fa...

A simple approach for computing unsteady aerodynamic forces from simulated measured strain data is proposed in this study. First, the deflection and slope of the structure are computed from the unsteady strain using the two-step approach. Velocities and accelerations of the structure are computed using the autoregressive moving average model, on-line parameter estimator, low-pass filter, and a ...

Abstract As the main load-bearing component of aero-engine system, thin-walled casings have characteristics large size, complex structure, thin wall, and area. In addition to harsh working environment, it is necessary study applicable preventive measures contain high-energy fragments ensure flight safety. The load formed by axial impact circumferential torsion exerted turbine rotor on exhaust c...