Recent wind tunnel studies on solar concentrator structures indicate that structures with low damping properties are potentially susceptible to the spectral nature of atmospheric wind loading. Solar concentrators are sensitive to deflections in optical mounting and tracking systems; consequently, structures and drives with sufficient rigidity to resist dynamically induced loading with minimal deflections are costly. The cost and performance characteristics of solar concentrators and other relatively small structures such as power transmission line supports and highway signs can be improved through structural design approaches that reduce dynamic response. Through the use of finite element modeling, Phase I of this study evaluates the cost and functional benefit of various methods to control dynamic response. Among the methods to be considered are passive damping, multiple supports, friction connections, mass alterations, beam length modification, and alternate materials selection.Anticipated Results/Potential Commercial Applications as described by the awarded:The objective of the study is to develop techniques for the reduction of dynamic responses to wind loading within relatively small structures such as solar concentrators, power transmission line supports, and highway signs. The study will attempt to determine the effectiveness of methods such as passive damping, multiple supports, friction connections, mass alterations, beam length modification, alternate materials selection, and other methods that may be identified in reducing the effects of dynamically induced wind loading. The long-range goal will be to provide documented guidelines for the design of small wind loaded structures to improve performance and reduce cost.
