Finite element analysis on the stress state of rope hoisting equipment based on the ABAQUS
This paper presents a simulation of the steel wire rope of a certain type hoisting equipment to explore the distributions of stress and deformation in the process of lifting heavy loads. The SolidWorks software was used to establish the 3D solid model of the 6*6+WS structure of stone cross strand wire rope for a certain lifting equipment. Then the solid model of steel wire rope was imported into the ABAQUS directly through the SolidWorks and ABAQUS interface plugin, the material properties were defined, the contact pairs were established, the model was meshed, and the constraints were applied to solve the finite element model. In the normal working range of the wire rope, axial tension of 5000 N was loaded to analyse the stress and deformation distributions. The results show that the stress of wire rope presents a space spiral distribution and the stress of the lateral steel wire of the rope strand is the largest of the steel wire rope, which will provide reference for the design and improvement of the steel wire rope.
Effect of Structure Parameters on Polycal Wire Rope Isolator Stiffness-Damping Characteristics
Wire rope isolators are mainly used to isolate vibration and protect precise equipment. However, the issue of regulation of vibration isolators taking into account the nonlinearity of their characteristics was poorly understood in the modern literature. In this paper, the influence of structural parameters (diameter ratio and lay pitch of the single strand, and lay pitch and bending radius of the wire rope) on stiffness-damping characteristics of the Polycal WRI was investigated by the simplified finite element analysis method. The stiffness and damping prediction models including structural parameters and material properties were established. The results showed that the stiffness-damping characteristics were the best; when the diameter ratio of wire strand was 1.1, the inside layer wire pitch length was 6 times the diameter of the wire strand, the outside layer wire pitch length was 11 times the diameter of the wire strand, the pitch length of the wire rope was 7.5 times its diameter, and the bending radius was equal to 46.5 mm. The errors of the prediction for prestiffness and softened stiffness were within 5%, and the errors of prediction for the energy dissipation coefficient were within 10%.
The Law of Failure
If a broker-dealer liquidates in federal bankruptcy court, why does an insurance company liquidate in state court, and a bank outside of court altogether? Why do some businesses re-organize under state law 'assignments', rather than the more well-known Chapter 11 of the Bankruptcy Code? Why do some laws use the language of bankruptcy but without advancing policy goals of the Bankruptcy Code? In this illuminating work, Stephen J. Lubben tackles these questions and many others related to the collective law of business insolvency in the United States. In the first book of its kind, Lubben notes the broad similarities between the many insolvency systems in the United States while describing the fundamental differences lurking therein. By considering the whole sweep of these laws - running the gamut from Chapter 11 to obscure receivership provisions of the National Bank Act - readers will acquire a fundamental understanding of the 'law of failure'.