scholarly journals Evaluation of Boat Lifting System Using A Multiple-Drum Winch

Kapal ◽  
2020 ◽  
Vol 17 (1) ◽  
pp. 7-14
Author(s):  
I Putu Sindhu Asmara ◽  
Hartono Yudo
Keyword(s):  
Material Handling ◽  
Wire Rope ◽  
Gantry Crane ◽  
Pulley System ◽  
Technical Aspects ◽  
Overhead Cranes ◽  
Two Factors ◽  
Small Craft ◽  
Technical Specifications ◽  
Lifting System

Material handling equipment is designed or selected based on two factors, the aspects of technical and economic. Technical aspects of a boatlift are designated by technical specifications that can meet with the need to lift and move a boat from land to waterway and vice versa. Boatlift is a type of Rubber Tyred Gantry crane specifically designed for moving of small craft, small and medium vessels with a capacity of 10 tons to 600 tons. Boatlift with a capacity of 5 tons is very rarely to find and very different from other types of cranes such as overhead cranes that are easy to find. Boatlift with a capacity of 5 tons can be found at the Shipbuilding Institute of Polytechnic Surabaya, but it has a weakness. The boats experience an un-synchronize movement during the lifting process. This article provides the design of a boatlift pulley system with a capacity of 5 tons using a multiple-drum winch and is capable of lifting the boat at an even keel condition. The evaluation was carried out on the existing system to find the cause of the problem. The correction on the pulley system of the boatlift has been recommended without the replacement of wire rope, brakes, motor, and the multiple-drum of the winch. The weaknesses of boat lifting could be overcome by using a pulley system 8/2/2/1-DeBe + spreader.

Effect of Interfacial Trellis Contact Forces in a Wire Rope

2010 ◽  
Author(s):  
B. K. Gnanavel ◽  
N. S. Parthasarathy
Keyword(s):  
Material Handling ◽  
Double Helix ◽  
Wire Rope ◽  
Contact Forces ◽  
Engineering Applications ◽  
Torsional Response ◽  
Stay Cables ◽  
Interfacial Contact ◽  
Cable Assembly ◽  
High Flexibility

Tension resisting elements like wire ropes are critical elements in countless engineering applications ranging from material handling, construction site applications, tethers in underwater platforms, apart from stay cables in cable stayed bridges. The main advantage of the wire rope lies in its capacity to support large axial loads with high flexibility in bending and torsional modes. These properties are useful for their own storage, transportation and also in engineering applications where frequent bending is encountered in pulleys/sheaves/drums. The source of such a peculiar mechanical property of the rope can be attributed to the local relative movements between adjacent wires of the rope. A wire rope is a cable assembly consisting of a central core strand surrounded by a number of strands wound helically in a single or multi layers. The wires making up the strand are of helix patterns and when such strand combine to form a rope it takes up invariably another helix pattern, involving many times, a double helix arrangement. Depending on the nature of the contact of the helical wires at their interfaces the rope behaviour can be examined. Point or line contact forces, may arise, resulting in localised stresses. When these strands are assembled to form a wire rope, the complexity of the interfacial contact arrangement generally lead to simplified assumptions for predicting the rope response. An attempt is made in this paper to model a wire rope strand and deduce its equations of equilibrium, considering the interfacial contact forces and studying the associated slip of the wires. A mathematical model is developed to estimate the axial and torsional response of the rope. The effect of the interfacial forces is studied and compared with earlier researchers, where such considerations are not or partially made.

Automated Control and Optimisation of Overhead Cranes

2017 ◽  
Vol 7 (3) ◽  
pp. 41-68
Author(s):  
Ashwani Kharola ◽  
Pravin P. Patil
Keyword(s):  
Gantry Crane ◽  
Automated Control ◽  
Computing Technique ◽  
Fuzzy Controllers ◽  
Overhead Cranes ◽  
Triangular Shape ◽  
Simulink Model ◽  
Load Swing ◽  
Varying Mass ◽  
Load Mass

This study considers a fuzzy based computing technique for control and optimising performance of overhead gantry crane. The objective is to minimise load swing and stabilise crane position in the least possible time. The fuzzy controllers were designed using nine gaussian and triangular shape membership functions. The results clearly confirmed the effect of shape of memberships on performance of fuzzy controllers. Performance of overhead crane was measured in terms of settling time and overshoot. The study also demonstrates the influence of varying mass of the load, mass of crane and length of crane bar on stability of the crane. A mathematical model of the crane system has been derived to develop a simulink model of proposed system and performing simulations.

A Study on Wire-rope Type Furnace Scaffolding and Its Lifting System for Large-sized Boiler

2016 ◽  
Vol 40 (7) ◽  
pp. 679-683
Author(s):  
Seung Woo HA ◽  
Tae Ho Lee ◽  
Hae Seung Lee ◽  
Jeung Min Kim ◽  
Tai Woo You ◽  
...  
Keyword(s):  
Wire Rope ◽  
Lifting System

A QFD-based expert system for industrial truck selection in manufacturing organizations

2016 ◽  
Vol 27 (6) ◽  
pp. 800-817 ◽  
Author(s):  
Shankar Chakraborty ◽  
Kanika Prasad
Keyword(s):  
Decision Making ◽  
Expert System ◽  
Quality Function Deployment ◽  
Material Handling ◽  
Evaluation Criteria ◽  
Selection Procedure ◽  
Content Type ◽  
Selection Problems ◽  
Technical Specifications ◽  
Manufacturing Organization

Purpose Availability of accurate quantity of materials, at correct place and at right time is extremely critical for increasing production effectiveness of any manufacturing organization. This can be achieved through employing an appropriate material handling equipment (MHE) capable of performing the desired operation. Therefore, choosing a right MHE from the available options is a key concern for the success, growth and competitiveness of a manufacturing organization. The purpose of this paper is to describe the design and development of an expert system based on quality function deployment (QFD) methodology in Visual Basic 6.0 for selecting the most appropriate industrial truck which is a commonly practiced MHE in any manufacturing organization. Design/methodology/approach A QFD-based approach is adopted to incorporate customers’ needs into the evaluation criteria on the basis of which industrial truck selection is carried out. The applicability of the developed expert system in solving industrial truck selection problems is demonstrated using two illustrative examples. Findings While applying this QFD-based model, CPCD 80x manufactured by Heli is recognized as the most suitable forklift truck for transporting unitized loads within a manufacturing unit with some spatial constraints, and for loading/unloading packages/boxes/cartons and place them at the desired locations in a manufacturing unit, ETV 216 manufactured by Jungheinrich evolves out as the most suitable reach truck. Originality/value Till date, numerous research articles have been published suggesting the applications of various mathematical models, multi-criteria decision-making methods and knowledge-based systems for solving MHE selection problems, and it is intriguing to note that none of the previously adopted methods has proposed a systematic procedure for selection of the evaluation criteria and interrelated the needs of customers with the technical specifications of MHEs while identifying the best alternative for performing a specified operation. These issues can be addressed through application of this developed QFD-based expert system, which can translate customers’ needs into organizational functions that are implementable in the decision-making/selection procedure.

Using a Funded Capstone Project to Teach Fluid Power and Advanced Mechanical Design

2014 ◽  
Author(s):  
James Mynderse ◽  
Selin Arslan ◽  
Liping Liu
Keyword(s):  
Undergraduate Students ◽  
Mechanical Engineering ◽  
Material Handling ◽  
Engineering Students ◽  
Mechanical Design ◽  
Fluid Power ◽  
Heat Transfer Fluid ◽  
Gantry Crane ◽  
Capstone Project ◽  
Operator Interface

The A. Leon Linton Department of Mechanical Engineering at Lawrence Technological University offered a new senior capstone project to a small group of students, funded by a teaching grant from the National Fluid Power Association. All mechanical engineering students at Lawrence Tech must complete a capstone project: either an SAE competition team or a project addressing a particular industry need. The team that worked on the current project consisted of students with various concentrations in mechanical engineering and included an international visiting student from Brazil. Three faculty in Mechanical Engineering, each with different areas of expertise: thermodynamics, heat transfer, fluid mechanics and mechatronics, mentored and worked closely with the students at every step of this project. The objective of this project was to design and fabricate a classroom-scale gantry crane for material handling. The undergraduate students were not only involved in the design of a fluid powered system, but also worked on the modeling of mechanical components and the mechanical system as well as circuit design for an operator interface. The self-guided and real-world design aspect of the project increases the effectiveness of teaching by the faculty and retention of the subject by the students involved in the project.

scholarly journals Fluorescence angiography after vascular ligation to make the ileo-anal pouch reach

2021 ◽  
Author(s):  
J. J. Joosten ◽  
M. A. Reijntjes ◽  
M. D. Slooter ◽  
M. Duijvestein ◽  
C. J. Buskens ◽  
...  
Keyword(s):  
Ileal Pouch ◽  
Technical Note ◽  
Fluorescence Angiography ◽  
Technical Aspects ◽  
Trade Off ◽  
Vascular Ligation ◽  
Anal Anastomosis ◽  
Two Factors ◽  
Arterial Inflow ◽  
Inflow Problem

AbstractThe two most essential technical aspects of any gastrointestinal anastomosis are adequate perfusion and sufficient reach. For ileal pouch-anal anastomosis (IPAA), a trade-off exists between these two factors, as lengthening manoeuvers to avoid tension may require vascular ligation. In this technical note, we describe two cases in which we used indocyanine green (ICG) fluorescence angiography (FA) to assess perfusion of the pouch after vascular ligation to acquire sufficient reach. In both cases, FA allowed us to distinguish better between an arterial inflow problem and venous congestion than white light assessment. Both pouches remained viable and no anastomotic leakage occurred. Our results indicate that ICG FA is of great value after vascular ligation to obtain reach during IPAA.

scholarly journals The Application of Kalman Filtering to Predict Vertical Rail Axis Displacements of the Overhead Crane Being a Component of Seaport Transport Structure

2016 ◽  
Vol 23 (2) ◽  
pp. 64-70 ◽  
Author(s):  
Daria Filipiak – Kowszyk ◽  
Waldemar Kamiński
Keyword(s):  
Kalman Filtering ◽  
Horizontal Direction ◽  
Gantry Crane ◽  
Overhead Crane ◽  
Practical Application ◽  
Technical Design ◽  
Filtration Method ◽  
Overhead Cranes ◽  
Operational Safety ◽  
Vertical Displacements

AbstractAs the devices designed to transport materials, the overhead cranes should meet certain geometric requirements for their operation to be safe. The presently available geodetic equipment, in particular total stations, provides opportunities for precise 3D measurements of coordinates of the controlled points. These coordinates make a basis for correcting the height of crane runway axes. The paper presents a method to calculate position corrections for the crane rail axes in both vertical and horizontal direction, and indicates that these results can find much wider application. Among other goals, the observations of this type, along with the Kalman filtration method, can be used to predict vertical displacements of the crane rail axes. The object of practical considerations in the paper is a crane working in the area with unfavourable geotechnical conditions and the settling limits attributed to this crane and location area in the technical design. The sample practical application has confirmed the validity of the use of the proposed solution for evaluating the operational safety of the crane. Although the tests were performed for the gantry crane, the proposed solution is believed to be applicable for other types of overhead cranes.

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