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Joining of Metals
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
A mobile winch (little crane) can be moved on casters. It has a capacity of lifting 1 ton for 3 feet (0.9 m) above ground. The lifting arm can be extended, and the winch can then lift 1/2 ton for up to 6 feet (1.8 m). Knowing that the production volume is 4000 units and that casters and hydraulic pressure cylinders are to be purchased from vendors, provide a detailed design and include full specifications of the parts to be purchased.
Reliability maintenance aspects of deck machinery for ageing/aged fishing vessels
Published in Journal of Marine Engineering & Technology, 2022
David Kimera, Fillemon Nduvu Nangolo
The maintenance of deck machinery systems beyond their useful lifetime is paramount in order to ensure the safety of the operators and keep downtime at its optimal base. A re-maintenance plan/strategy is recommended where the vessel owners/managers should emphasise scheduled maintenance checks and reports from the maintenance crew on a weekly basis. For reliability prediction of ageing deck machinery, degradation data such as crane drop load, crane load capacity, winch loads, winch load tension, capstan rpm, crane/capstan brake power among others, ought to be used in preference to only failure data because degradation can be modelled using several approaches. These degradation data trends can be used by the maintenance crew to further analyse machinery performance and maintenance options. When using reliability software, field data and machine specifications ought to be incorporated for best interpretation of the software output results. There is a need to carry out fatigue tests on aged/ageing deck machinery in order to ascertain the fatigue-failure relationship and how fatigue affects the reliability of such machinery.
Study on the system design and control method of a semi-active heave compensation system
Published in Ships and Offshore Structures, 2018
Mingjie Li, Pan Gao, Junliang Zhang, Jijun Gu, Yingjin Zhang
Based on the analysis of various existing winch compensation devices, the heave compensation system is designed as a separate device using the pulley block structure. The heave compensation system can be installed by retrofitting the existing installation vessel and winch. As shown in Figure 4, it is placed between the winch and the A-frame, with the wire rope traversing through the pulleys. The heave compensation is achieved by adjusting the pulley spacing, which is actuated by the hydraulic cylinder. As the wire travels through the moving and fixed pulleys, the reciprocation of the piston changes the wire length between the pulleys, resulting in the change of the wire length in water.
Principle of object support by Rope deformation and its application to Rope climbing by snake robot
Published in Advanced Robotics, 2023
Ryota Watanabe, Motoyasu Tanaka
Our proposed mechanism differs from that of a winch, which utilizes a principle similar to that of the belay device. In particular, the capstan winch generates a support force by winding a large rope around the drum. In [14], a capstan winch was proposed for mobile robots. This mechanism is effective when a large number of ropes is wound around it. However, the capstan winch continuously winds the rope, which necessitates a long rope for moving a long distance. We believed that by deforming the rope at multiple points, as in a belay device, it would be possible to support an object without the need for special mechanisms or continuous winding of the rope, as in the case of a capstan winch.