Optimization of RC eolic towers based on experimental data

• Grant number: 05/02815-5
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: August 01, 2006
• End date: September 30, 2008
• Field of knowledge: Engineering - Civil Engineering - Structural Engineering
• Principal Investigator: Reyolando Manoel Lopes Rebello da Fonseca Brasil
• Grantee: Marcelo Araujo da Silva
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

We intend in this work to study and program the optimization of reinforced concrete eolic towers and their respective foundations, submitted to the wind and turbines dynamic loading. The costs of the structures and foundations will be minimized. The problem of cost minimization is an optimization problem. Computational programs, based on the Augmented Lagrangian Method (Chahande and Arora, 1994; Arora, 1999), will be developed and used to minimize the costs. The design variables of the optimization problems will be the geometric properties of the structural elements and their respective steel areas. For the evaluation of the cost function, we will consider the production cost, including work hand, materials and general expenses of factory. Constrains related to stress, displacements and frequencies of vibration will be applied. In this work the towers will be modeled using beams finite elements, while the foundations using plate and beam elements. A non-linear dynamic analysis will be accomplished (Silva and Brasil, 2005), basing on experimental data of Brasil and Silva (2005), where the stiffness is computed using equations in function of the level of effort. The eolic generators will be treated as a non-ideal dynamic loading (Feitosa and Brasil, 2004). We will compare the performances obtained in the several formulations adopted. We will conclude which project is the most appropriate for each case analyzed. Finally, we will publish at least two papers in technical and scientific journals of international prestige, while the programs and projects obtained will be available for base of researches of futures advised and companies of this sector. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SILVA, MARCELO A.; WAHRHAFTIG, ALEXANDRE M.; BRASIL, REYOLANDO M. L. R. F.. Remarks on optimization of impact damping for a non-ideal and nonlinear structural system. JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL, JUL 2020. (06/04744-0, 05/02815-5, 18/11820-2)

SILVA, MARCELO A.; WAHRHAFTIG, ALEXANDRE M.; BRASIL, REYOLANDO M. L. R. F.. Remarks on optimization of impact damping for a non-ideal and nonlinear structural system. JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL, v. 40, n. 2, p. 948-965, JUN 2021. (05/02815-5, 06/04744-0, 18/11820-2)