Selected Publications

Parameter optimization for tuned liquid column dampers (TLCD), a class of passive structural control, have been previously proposed in the literature for reducing vibration in wind turbines, and several other applications. However, most of the available work consider the wind excitation as either a deterministic harmonic load or random load with white noise spectra. In this paper, a global direct search optimization algorithm to reduce vibration of a tuned liquid column damper (TLCD), a class of passive structural control device, is presented. The objective is to find optimized parameters for the TLCD under stochastic load from different wind power spectral density. A verification is made considering the analytical solution of undamped primary system under white noise excitation by comparing with result from the literature. Finally, it is shown that different wind profiles can significantly affect the optimum TLCD parameters.
IOP Conference Series: Materials Science and Engineering

Passive energy dissipation systems encompass a range of materials and devices for enhancing damping. They can be used both for natural hazard mitigation and for rehabilitation of aging or deficient structures. Among the current passive energy dissipation systems, tuned liquid column damper (TLCD), a class of passive control that utilizes liquid in a 'U' shape reservoir to control structural vibration of the primary system, has been widely researched in a variety of applications. This paper focus in TLCD application for wind turbines presenting the mathematical model as well as the methods used to overcome the nonlinearity embedded in the system. Optimization methods are used to determine optimum parameters of the system. Additionally, a comparative analysis is done considering the equivalent linearized system and the nonlinear system under random excitation with the goal of compare the nonlinear model with the linear equivalent and investigated the effectiveness of the TLCD. The results are shown using two types of random excitation, a white noise and a first order filters spectrum, the latter presents more satisfactory results since the excitation spectrum is physically more realistic than white noise spectrum model. The results indicate that TLCDs at optimal tuning can significantly dissipate energy of the primary structure between 3 to 11%.
Journal of Physics: Conference Series, IOP Science.

Recent Publications

  • Optimum Parameters of a Tuned Liquid Column Damper in a Wind Turbine Subject to Stochastic Load

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  • Vibration Reduction of Wind Turbines Using Tuned Liquid Column Damper Using Stochastic Analysis

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Recent Posts

Normally, the procedure of including figures consist of generating a .Fig from your programing language, generating a .eps or .pdf and then including it in your TeX. There is two essential problems with this scheme. The first one is that if you have to make small changes in the plot, you need to go back to your .Fig file and regenerate the output format again. The second problem comes from the type font utilized in the plot.

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Introduction A few moments to learn, a lifetime to master is an ancient proverb shouted to someone uninitiated in the game of Go. Also known as Baduk in Korean and Wei-qi in Chinese, Go is an ancient board game that means literally encircling game and as Edward Lasker, chess Grandmaster, stated, “the rules of Go are so elegant, organic, and rigorously logical that if intelligent life forms exist elsewhere in the universe, they certainly play go”.

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Hi, this first post I show you how I created this website.

You do not need any knowledge in PHP or CSS. You do need to know a little of windows terminal, and git.

First, download Hugo.

The second and last step is follow this article.

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Those are my current favorite Youtube channels. Munchies Munchies is not your usual food channel show, they do it raw and do it better. The amount of series they have is also impressive. My favorites are Chef’s Night Out and Action Bronson’s fuck that’s delicious. Every frame of painting This channel explain the technicality of movies. His analysis are very convince and he puts a lot of effort to make his point in why and how great movies are made.

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Projects

Boundary Element

3D Boundary Element in Python