How big should the conductors be? The required size (or gauge) of the conductors depends on three factors: (1) the load impedance; (2) the length of cable required; and (3) the amount of power loss that can be tolerated. Each of these involves relationships between voltage (volts), resistance (ohms), current (amperes) and power (watts). These relationships are defined with Ohm’s Law. The job of...

A technique for real-time simulation of hoisting cable systems based on a multibody nonideal constraint is presented. The hoisting cable constraint is derived from the cable internal energies for stretching and twisting. Each hoisting cable introduces two constraint equations, one for stretching and one for torsion, which include all the rigid bodies attached by the same cable. The computation ...

Steel cables are widely used in cable-stayed bridges, suspension bridges and so on. It is important to test them periodically for their safe operation. The cable tension is one of the key testing parameters. Magnetoelastic methods are usually adopted to measure the cable tension due to their non-contact features. However, it is difficult to install the exciting and receiving encircling coil on ...

A finite element solution based on equevalent elements is proposed for the static and dynamic analysis of tallhigh tensioned cable antennas. To reduce high number of degrees of freedom in space frame body of a structure, a simple equivalent beam element is defined for each simulative substructure. This numerical procedure is applicable to analyze complex three dimensional assemblies of substruc...

This paper first presents a comprehensive comparison of the established radio telescope near Arecibo, Puerto Rico vs. the designed Chinese Five-hundred meter Aperture Spherical Telescope (FAST) that includes a six-degrees-of-freedom (dof) underconstrained cable-suspended robot to position and orient its focus cabin. Then a straight-line cable model is presented for the FAST robot kinematics and...

Aeolian vibration in bare and iced cable was simulated using the theory of cable vibration. High frequency vibration creates stresses in the cable and consequently in the ice covering that cable, which may result in ice failure and eventually ice shedding. These stresses were estimated in this study. Displacement of the cable during vibration was determined; furthermore, instantaneous wind load...

Cable System Management requires an assessment of the health of the cable systems. It is increasingly common for the assessment of aged cable systems to be made through the application of diagnostics measurements. Papers and standards have established benchmarks for diagnostic measurements that help utility engineers to reach a condition assessment. Generally, extremes of healthy and non-health...

In order to detect distributed ground surface deformation, an elastic helical structure Time Domain Reflectometry (TDR) sensing cable is shown in this paper. This special sensing cable consists of three parts: a silicone rubber rope in the center; a couple of parallel wires coiling around the rope; a silicone rubber pipe covering the sensing cable. By analyzing the relationship between the impe...

Analysis and design of an 8-storey cable net sculpture for a new transit center in Lower Manhattan required its designers to adopt a highly integrated computational approach. This approach combined aspects of structural analysis, form-finding, 3D and parametric modeling to achieve the artistic objectives of the sculptural form while ensuring desired performance of the extensive tensile system. ...

Fuzzy set theory has proved to be a successful paradigm to extend the database relational model, augmenting its skill to capture uncertaintly. This capability may be consider in two levels: the data itself and the constraints defined to adjust the database schema to the real system. When constraints are considered, it is necessary to design methods to reason about it and not only a way to expre...