• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 2
  • 1
  • Tagged with
  • 3
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Krovos irenginiu terminaluose efektyvumo tyrimas / Loading equipment efficiency in terminals

Pranevicius, Viktoras 22 June 2006 (has links)
In the final major degrees project was investigated the efficiency of loading equipment working in cargo terminals. In the beginning of project was simulated the methodology of loading equipment efficiency investigation and using it were analyzed container and metal store as terminal activity. Loading equipment working in container terminal were investigated using the theory of massive service. Also in the project were used economical and quantitative methods of management for detailed known of investigation object. In the investigation time of company AB “Lietuvos geležinkeliai“ were checked the few last years data of results in reloading works. Also in the project was investigated metal stores as cargo terminal modernization expedience, which was reasoned by calculations of productivity and according it was formulated the investment project for cranes and were given suggestions and conclusions. The main purposes of this project were to create methodology of loading equipment efficiency investigation and to analyze the expedience of loading equipment working in some Lithuanian metal stores.
2

Sequenciamento e programação de lavra com alocação de equipamentos de carga. / Scheduling of mining with allocation of loading equipments.

Andrade, Arthur Quintão de 08 April 2014 (has links)
Este trabalho tem seu foco no problema de sequenciamento e programação da lavra em mina a céu aberto, com alocação de equipamentos de carregamento. Neste estudo considera-se a existência de uma frota heterogênea de equipamentos de carga e dois tipos de material lavráveis, sendo minério ou estéril. Para a lavra de minério são considerados requisitos de qualidade a serem atingidos pela mistura de minério, um britador, uma capacidade de operação atribuída à usina de beneficiamento e uma pilha de estoque objetivando abastecer a usina quando faltar minério nas frentes de lavra, denominada pilha de ROM. Em uma mina o carregamento pode ser gerido por um plano de lavra que descreve a movimentação e a produção horária de cada equipamento de carga ao longo do tempo. Neste contexto, apresenta-se um modelo matemático apoiado por um algoritmo responsável por mover o horizonte de tempo a cada execução do modelo com intuito de gerar ordens de lavra resolvidas com otimalidade. Juntas, essas ordens descreverão o plano de lavra dos equipamentos de carga. Os experimentos computacionais, realizados utilizando dados de uma jazida de cobre, mostram a efetividade da proposta considerando um horizonte de médio prazo. / This paper focuses on the mining scheduling problem in open pit, considering the allocation of loading equipment. This study considers the existence of a heterogeneous fleet loading equipment and two types of mineable material, namely ore or waste. For the mining of ore are considered quality requirements to be met by the ore blending, a crusher, the capacity of operation of the processing plant and a stockpile which feed the plant when there is lack of ore in mining fronts, called ROM stockpile. In a mine, loading can be managed by a mining plan that describes the movement and the schedule of each load equipment over time. In this context, we present a mathematical model supported by an algorithm that is responsible for moving the time horizon for each model run, with the goal of generating mining orders till resolved to optimality. Together, these orders describe the mining plan of the loading equipment. The computational experiments, conducted using data from a copper deposit, show the effectiveness of the proposal considering a medium-term horizon.
3

Sequenciamento e programação de lavra com alocação de equipamentos de carga. / Scheduling of mining with allocation of loading equipments.

Arthur Quintão de Andrade 08 April 2014 (has links)
Este trabalho tem seu foco no problema de sequenciamento e programação da lavra em mina a céu aberto, com alocação de equipamentos de carregamento. Neste estudo considera-se a existência de uma frota heterogênea de equipamentos de carga e dois tipos de material lavráveis, sendo minério ou estéril. Para a lavra de minério são considerados requisitos de qualidade a serem atingidos pela mistura de minério, um britador, uma capacidade de operação atribuída à usina de beneficiamento e uma pilha de estoque objetivando abastecer a usina quando faltar minério nas frentes de lavra, denominada pilha de ROM. Em uma mina o carregamento pode ser gerido por um plano de lavra que descreve a movimentação e a produção horária de cada equipamento de carga ao longo do tempo. Neste contexto, apresenta-se um modelo matemático apoiado por um algoritmo responsável por mover o horizonte de tempo a cada execução do modelo com intuito de gerar ordens de lavra resolvidas com otimalidade. Juntas, essas ordens descreverão o plano de lavra dos equipamentos de carga. Os experimentos computacionais, realizados utilizando dados de uma jazida de cobre, mostram a efetividade da proposta considerando um horizonte de médio prazo. / This paper focuses on the mining scheduling problem in open pit, considering the allocation of loading equipment. This study considers the existence of a heterogeneous fleet loading equipment and two types of mineable material, namely ore or waste. For the mining of ore are considered quality requirements to be met by the ore blending, a crusher, the capacity of operation of the processing plant and a stockpile which feed the plant when there is lack of ore in mining fronts, called ROM stockpile. In a mine, loading can be managed by a mining plan that describes the movement and the schedule of each load equipment over time. In this context, we present a mathematical model supported by an algorithm that is responsible for moving the time horizon for each model run, with the goal of generating mining orders till resolved to optimality. Together, these orders describe the mining plan of the loading equipment. The computational experiments, conducted using data from a copper deposit, show the effectiveness of the proposal considering a medium-term horizon.

Page generated in 0.0835 seconds