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In the last decades, the demand and use of renewable energies have been increasing. The increase in renewable energies, particularly wind energy, leads to the development…
In the last decades, the demand and use of renewable energies have been increasing. The increase in renewable energies, particularly wind energy, leads to the development and innovation of powerful wind energy converters as well as increased production requirements. Hence, a higher supporting structure is required to achieve higher wind speed with less turbulence. To date, the onshore wind towers with tubular connections are the most used. The maximum diameter of this type of tower is limited by transportation logistics. The purpose of this paper is to propose an alternative wind turbine lattice structure based on half-pipe steel connections.
In this study, a new concept of steel hybrid tower has been proposed. The focus of this work is the development of a lattice structure. Therefore, the geometry of the lattice part of the tower is assessed to decrease the number of joints and bolts. The sections used in the lattice structure are constructed in a polygonal shape. The elements are obtained by cold forming and bolted along the length. The members are connected by gusset plates and preloaded bolts. A numerical investigation of joints is carried out using the finite element (FE) software ABAQUS.
Based on the proposed study, the six “legs” solution with K braces under 45° angle and height/spread ratio of 4/1 and 5/1 provides the most suitable balance between the weight of the supporting structure, number of bolts in joints and reaction forces in the foundations, when compared with four “legs” solution.
In this investigation, the failure modes of elements and joints of an alternative wind turbine lattice structures, as well as the rotation stiffness of the joints, are determined. The FE results show good agreement with the analytical calculation proposed by EC3-1-8 standard.
The purpose of this paper is to discuss the structural design of customer teams (CuTes) working with external teams to implement customized information systems (IS)…
The purpose of this paper is to discuss the structural design of customer teams (CuTes) working with external teams to implement customized information systems (IS). Design consists of theoretically based measures and a first set of real-world, empirical values.
A search in the organizational literature suggested that the adhocracy is the preferred structure for CuTes. Adhocracy-like measures were then developed and applied to a high-performance CuTe to reveal a first benchmark for a team’s adhocratic design.
High-performance CuTes do not necessarily implement the adhocratic principles to the highest degree.
It is still open whether all the structural measures described here are necessary and sufficient to describe the adhocracy-like structural design of CuTes.
The CuTe is highlighted as the key incumbent of cooperation with the technology supplier and consultants in terms of project authority and responsibility. A psychometric instrument and real-world values are proposed as a reference for the structural design of high-performance CuTes.
The performance of IS projects is a social concern, since IS products should be aimed at serving people better both inside and outside the organization. Professionals who work in CuTes to develop better IS should receive institutional recognition and management attention.
This study seems to be the first to discuss the structure of CuTes in customized IS projects from a theoretical and applied perspective.