This dissertation is a practical investigation into the magnitude of the vertical and lateral forces exerted, by electric overhead travelling cranes, on their supporting structures during operation. The method of measuring the forces and the equipment used for the actual measurements are discussed, as well as the equipment used for the processing of the recoided date. The forces measured during the experiments, executed in two stages namely controlled conditions and normal operation, are discussed under the headings of vertical forces due to the weight of the crane and lead handled, and the lateral forces due to cross travel movement, skewing of the crane and acceleration/deceleration of the crane. It is shown that the vertical misalignment of the rails, together with the stiffness of the crane structure, has a large influence on the magnitude of the vertical forces. Drive wheel slip, tested under controlled conditions on two E-type cranes, proved to cause high lateral forces. Comparisons are made with the existing Codes of Practice as well as with the theoretical models of crane behaviour.

Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: William Singhose; Committee Member: Nader Sadegh; Committee Member: Wayne J. Book. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 68.

Thesis (M.S.)--University of Wisconsin--Madison, 1963. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 57).

A research project submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in partial fulfillment of the requirements for the degree of Master of Science. / The problem of scheduling with sequence-dependent set-up times in a dynamic environment is investigated by studying how various dispatching rules perform when used to schedule two cranes. Motivated by a practical scheduling problem, the effect on production by delays due to the conflicts that result between cranes is examined. The problem is formalized, and it is shown that it can be classified as a problem of scheduling with both sequence-dependent set-up and processing times. The effectiveness of simple dispatching procedures that are used in machine scheduling and for the control of automated guided vehicles is studied, using a simulation of a crane aisle with jobs arriving dynamically. In addition, a dispatching rule, which explicitly uses information regarding the state of the second crane, is examined. The simulation results confirm the non-dominance of certain dispatching procedures, and show how performance is improved as the rules are provided more information regarding the state of the scheduling environment. It is shown that when there are sequence-dependent processing times, a scheduling heuristic that uses global information does significantly better than more commonly used local heuristics. / AC2017

Thesis (doctoral)--Königliche Techische Hochschule zu Berlin, 1904. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 98-110). Also available via the Internet.

Thesis (M.S.)--Ohio University, August, 1992. / Title from PDF t.p.

Thesis (doctoral)--Königliche Techische Hochschule zu Berlin, 1904. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 85-87). Also available via the Internet.