Energy conscious machine and robot speed decisions in two machine robotic cell scheduling

Download

Betül_Güzel_Thesis.pdf

Date

2021-6-15

Author

Güzel, Betül Necibe

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

389
views

372
downloads

Minimizing cycle time has always been a critical objective in manufacturing cells. Recently, energy efficient and environmentally conscious manufacturing practices have received increasing attention from researchers and practitioners. Therefore, in this thesis we consider a 2-machine manufacturing cell with a material handling robot where two conflicting objectives exist: minimization of cycle time and energy consumption. It is a flow type cell where identical parts are first processed on the first machine and then on the second machine. All handling operations between part buffers and machines and loading/unloading operations are done by a robot. Most of the research on robotic cell scheduling problems focus on robot activity sequencing decisions and assume that robot and machines operate at a fixed pace. However, both robot’s speed and machines’ processing times are controllable and they affect the cycle time and energy consumption performance of a cell. To the best of our knowledge, this is the first study that consider robot and machine speed controllability at the same time. We study three well known cyclic robot activity sequences and develop mathematical models that find efficient solutions for the problem. Our analysis on mathematical models show that energy optimization with robot speed and machine processing time control leads to schedules in which robot’s arrival to a machine for unloading operation and part completion time on the machine are synchronized. Furthermore, we provide a numerical study that explores which robotic activity sequence is better when and how much energy saving can be achieved by employing robot speed and processing time control strategies.

Subject Keywords

Robotic cell, Scheduling, Nonlinear optimization, Energy consumption, Controllable processing times, Robot speed control

URI

https://hdl.handle.net/11511/91349

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Energy conscious scheduling of a material handling robot in a manufacturing cell Gürel, Sinan; Akhlaghi, Vahid Eghbal (Elsevier BV, 2019-08-01) In cyclic scheduling of material handling robots in manufacturing cells, a common approach is to minimize the cycle time objective, which is a measure of the throughput of the cell. In a typical robot move cycle, robot move times constitute a significant portion of the cycle time. During handling operations, robots consume significant amount of energy, which is determined by their speed, load and the distance they travel. In this paper, we propose considering robot speed decisions along with robot move sequ...
Energy Efficient Scheduling in Flow-shop and Parallel Machine Robotic Cells Aydoğan, Çiya; Gürel, Sinan; Department of Industrial Engineering (2021-9-10) Robotic cell scheduling studies mostly focus on increasing the throughput of the cell. Therefore, those studies consider cycle time or makespan minimization objectives. However, energy-efficient and environmentally sensitive manufacturing operations become more important and receive attention in recent studies in the literature. In this thesis, we study two robotic cell scheduling problems with machines and a material handling robot. We consider robot energy consumption as an objective to minimize while max...
Scheduling in two-machine robotic cells with a self-buffered robot Gündoğdu, Emine; GÜLTEKİN, HAKAN (2016-02-01) This study considers a production cell consisting of two machines and a material handling robot. The robot has a buffer space that moves with it. Identical parts are to be produced repetitively in this flowshop environment. The problem is to determine the cyclic schedule of the robot moves that maximizes the throughput rate. After developing the necessary framework to analyze such cells, we separately consider the single-, double-, and infinite-capacity buffer cases. For single- and double-capacity cases, c...
Energy conscious scheduling in a two-machine robotic cell Akhlaghi, Vahid Eghbal; Gürel, Sinan; Gültekin, Hakan; Department of Industrial Engineering (2017) Robotic cells usually operate under time pressure to minimize time related objectives such as cycle time, makespan, and tardiness. Robot moves constitute a significant portion of cycle time. Also, robots consume significant amount of energy determined by the speeds and distances of their moves. We study the tradeoff between the cycle time and energy consumption of a robot in a two machine flexible robotic cell which processes identical parts. In this system, the loading and unloading of machines are made by...
PASSIVATION OF SILICON SOLAR CELLS VIA LOW TEMPERATURE WET CHEMICAL OXIDATION KÖKBUDAK, GAMZE; Çiftpınar, Emine Hande; DEMİRCİOĞLU, OLGU; Turan, Raşit (2016-12-01) In the development of high efficiency crystalline Si solar cells, decreasing bulk and surface recombination velocities of the minority carriers is vital. As the bulk recombination could be suppressed by enhancing the material quality, the effect of surface recombination on cell performance becomes more dominant. Also, recent studies have revealed that the area under the metal contacted region needs to be passivated to minimize the carrier recombination. The passivation of front and back surface of the cell ...

Citation Formats

B. N. Güzel, “Energy conscious machine and robot speed decisions in two machine robotic cell scheduling,” M.S. - Master of Science, Middle East Technical University, 2021.