The flow-induced vibration (FIV) of a rectangular cylinder with side ratio 4 at Re = 300 is numerically investigated by two-dimensional spectral-element method. constrained to vibrate only in the cross-flow direction. effects mass and damping are studied. Boss typical FIV, vortex-induced (VIV), galloping were found. Although quasi-steady theory predicts that will not occur for 4:1 cylinder, we ...

The weakly nonlinear, freely vibrating motion of a system of coupled spans of suspended overhead transmission lines is studied. It is shown that the natural vibration is the gravity mode, of which the unsteady tension component vanishes in the first harmonic. The problem was born out of a study of the phenomenon of galloping, which is a high amplitude periodic oscillation of overhead transmissi...

The storage and recovery of elastic strain energy in muscles and tendons increases the economy of locomotion in running vertebrates. In this investigation, we compared the negative and positive external work produced at individual limb joints of running dogs to evaluate which muscle-tendon systems contribute to elastic storage and to determine the extent to which the external work of locomotion...

Abstract A distributed online fiber sensing system based on the phase-sensitive optical time domain reflectometer (?-OTDR) enhanced by drawing tower Bragg grating (FBG) array is presented and investigated experimentally for monitoring galloping of overhead transmission lines. The chirped FBG ?-OTDR can be used to measure behavior lines (optical phase conductor or power ground wire), which are h...

Aeroelastic effects are relatively common in the design of modern civil constructions such as office blocks, airport terminal buildings, and factories. Typical flexible structures exposed to the action of wind are shading devices, normally slats or louvers. A typical cross-section for such elements is a Z-shaped profile, made out of a central web and two-side wings. Galloping instabilities are ...

The phenomenon of self-induced vibrations of prismatic beams in a cross-flow has been studied for decades, but it is still of great interest due to their important effects in many different industrial applications. This paper presents the experimental study developed on a prismatic beam with H-section. The aim of this analysis is to add some additional insight into the behaviour of the flow aro...

Unilateral skipping or bipedal galloping is one of the gait types that humans are able to perform. In contrast to many animals, where gallop is the preferred gait at higher speeds, human bipedal gallop only occurs spontaneously in very specific conditions (e.g. fast downhill locomotion). This study examines the lower limb mechanics and explores the possible reasons why humans do not spontaneous...

Galloping is a typical wind-induced phenomenon in iced conductors, which can have serious impacts on the safe and stable operation of power systems. The aerodynamic characteristics an conductor are key factor study galloping, be determined mainly by numerical simulation flow past conductor. Based Reynolds-averaged Navier-Stokes (RANS) equations closed Spalart-Allmaras (S-A) turbulence model, th...