Vinicius Moraes’ Post

Many codes have provisions that if the structural frequency is greater than 1 Hz, the wind resonance effect does not need to be considered. However, from many experiments and on-site accidents, we can see that although the inherent frequency of most tracking systems is greater than 1 Hz, they still resonate with the wind.

A new windrotor from University of Birmingham, vertical axis, created by K I ( A I)? 7 Times more efficient than modern Wind Turbine s? You can't violate the aerodynamic rules. Choose the windspeed ( m/s), Take the Betz-figure (Watts/m2), Multiply with the crosssection of the VAT (rectangle in m2). This is the absolute theoretical output of the Birmingham rotor also. Another ineffectiv system to earn electricity out of the wind, especially at low windspeeds

Ultrasonic Wind Speed Direction Sensor is a device to measure wind speed and direction based on ultrasonic principle. 👍 https://lnkd.in/gVmw8Y9D

I recommend that recent document RESEARCH ON THE DYNAMIC RESPONSE OF HIGH-SPEED TRAINS UNDER DIFFERENT CURVE RADII CAUSED BY WIND–SAND FLOW https://lnkd.in/e68c9bXF

Galebreaker has shown results on close to 100 ACCs world wide. Each project is individually analyzed using CFD Analysis with specific data from each ACC. We focus on reducing performance inefficiencies and or reducing downtime and reducing maintenance costs to the fans, fan hardware, and gear reducers.

Hi everyone, I wanted to share a recent article titled 'Impact of Atmospheric Turbulence on Wind Farms Sited Over Complex Terrain.' If you're interested in atmospheric turbulence, LES, Wavelets and wind farms, check it out! https://lnkd.in/gmsBtWY5

End of March we gave a free webinar. If you missed it and are interested in wind turbine aeroelasticity, please let us know and we can send you the slides, with some additional comments to cover what was verbally explained during the webinar. The e-mail address is in the picture, we will not use your details for anything else, only for sending the slides. In these slides we explain what whirling modes are and why they exist, then edgewise instabilities, starting with the basic aerodynamic explanation, but continue with the relevance of torsion: what influences the amount of torsion in the edgewise mode and how does this affect the damping of the mode. The phase of the torsion is found to be very influential, therefore it is also be explained where this phase comes from and which parameters change the phase in which way. Finally also the edgewise instability during idling is shortly discussed.

(archive: 2014) Acoustic interaction as a primary cause of infrasonic spinning mode generation and propagation from wind turbines: Abstract. Relatively balanced load related pressure waves from the rear surface of each rotor blade, are at a frequency of 1 per revolution of the turbine and are phase shifted by 120 degrees from each other. The superpositions of these infrasonic waves destructively interfere. This action results in a non-propagating rotor locked mode, however, the shielding (reflecting) effect of the tower as each blade passes, interrupts the balanced destructive interference for a small portion of rotor angle three times per . . . #windpower #windenergy

In our recent paper we presented at #TORQUE24 "Sensitivity of the Prediction of Wind Turbine Wakes to the Sub-Grid Scale Model" (https://lnkd.in/daRmwtsE) six sgs models were compared in the large-eddy simulation of a single wind turbine using actuator line method with our in-house code #DOFAS. Given the stable atmospheric thermal stratification and Coriolis forcing, we've seen the wake of the turbine to feature a non-Gaussian shape which is very interesting. Well done to Mina Ghobrial leading this research supervised by Tim Stallard, David Schultz and myself at The University of Manchester. More to come soon!!

Small Wind Propulsion Vessel Survey  The small wind propulsion vessel segment is growing and this regular survey will help us to understand how the sector is growing and the barriers and drivers to further scaling these activities. https://lnkd.in/gKSWfGFV