The Burj Dubai Project will be the tallest structure ever built by man; when completed the tower will be more than 700 meters tall and more than 160 floors. The early integration of aerodynamic shaping and wind engineering considerations played a major role in the architectural massing and design of this residential tower, where mitigating and taming the dynamic wind effects was one of the most...

The present study proposes a novel tower-control technique that couples linear control feedback theory with an online time-frequency analysis of the tower vibrations, with the aim to widen the research area of situational control of wind turbines. Numerical simulations were conducted for two 5MW-class offshore wind turbines, and the performance of the proposed control method has been tested in ...

conclusions the results of this study led to the identification of many of the errors and conditions that affect the performance of controllers, providing the ability to define safety and ergonomic interventions to reduce the risk of human error. therefore, the results of this study can be a basis for planning atm to prioritize prevention programs and safety enhancement results the analysis of ...

Random vibration analysis of tall structures faces multiple problems due to the large number of elements and high degrees of freedom; that is why this type of analysis is mostly used in simple structures and low degrees of freedom. In the past two decades, changes have been occurred in this type of analysis to be used in complex structures and the large number of elements. Pseudo-Excitation Met...

We analyze a solution to a variant of the Towers of Hanoi problem, in which multiple spare pegs are used to move the disks from the source to the destination peg. We also discuss the interesting relation between the number of disks and the total number of disk moves when the number of spare pegs is a function of number of disks.

A Huey Cobra helicopter was just finishing up a nighttime practice run. The pilot was working on his low hover maneuvers at the air base when he tipped his tail rotor sharply backward, snapping off his tail boom. Without the tail —which keeps a helicopter from spinning around in circles— the helicopter took off like a pinwheel, sliding down the runway doing 360’s in a brilliant shower of sparks...

The hardware and software designs need a clear, consistent and universally accepted definition of the coordinate system for the LAT. This note specifies the global LAT instrument coordinate system; the terminology, numbering, and orientation of detector planes in the TKR and CAL; and tower numbering, the local tower coordinate systems, and detector element numbering within a tower. The conventi...

Finding an optimal solution to the 4-peg version of the classic Tower of Hanoi problem has been an open problem since the 19th century, despite the existence of a presumed-optimal solution. We verify that the presumed-optimal Frame-Stewart algorithm for 4-peg Tower of Hanoi is indeed optimal, for up to 20 discs. We also develop a distributed Tower of Hanoi algorithm, and present 2D and 3D repre...

Current lidar technology is offering a promising opportunity to take a fresh look at wind turbine control. This work evaluates a flatness-based feedforward approach, that allows to calculate the control action based on trajectories of the rotor speed and tower motion using wind measurements. The trajectories are planned online considering actuator constrains to regulate the rotor speed and mini...

This paper describes a system which solves the puzzle "Instant Insanity". The puzzle consists of four multicolored cubes. The solution involves arranging the cubes in a tower so that no side of the tower reveals more than one face of a given color. Our system, which runs as eight (multitask) jobs under the PDP-10 time-sharing system, uses a TV camera to locate four objects and, having verified ...