| 1. |
- Mohammed, Abdullah, et al.
(författare)
-
Minimizing energy consumption for robot arm movement
- 2014
-
Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 25, s. 400-405
-
Konferensbidrag (refereegranskat)abstract
- Robots are widely used in industry due to their efficiency and high performance. Many of them are operating in the manufacturing stage of the production line where the highest percentage of energy is consumed. Therefore, their energy consumption became a major focus for many robots manufacturers and academic research groups. Nevertheless, the optimization of that consumption is still a challenging task which requires a deep understanding of the robot's kinematic and dynamic behaviors. This paper proposes an approach to develop an optimization module using Matlab® to minimize the energy consumptions of the robot's movement. With the help of Denavit-Hartenberg notation, the approach starts first by solving the inverse kinematics of the robot to find a set of feasible joint configurations required to perform the task, solving the inverse kinematics is usually a challenging step which requires in-depth analyses of the robot. The module then solves the inverse dynamics of the robot to analyze the forces and torques applied on each joint and link in the robot. Furthermore, a calculation for the energy consumption is performed for each configuration. The final step of the process represents the optimization of the calculated configurations by choosing the one with the lowest power consumption and sends the results to the robot controller. Three case studies are used to evaluate the performance of the module. The experimental results demonstrate the developed module as a successful tool for energy efficient robot path planning. Further analyses for the results have been done by comparing them with the ones from commercial simulation software. The case studies show that the optimization of the location for the target path could reduce the energy consumption effectively.
|
|
| 2. |
- Stenberg, Niclas, 1964-, et al.
(författare)
-
Numerical Modelling of Turning to Find Residual Stresses
- 2013
-
Ingår i: Procedia CIRP. - : Elsevier. - 2212-8271. ; , s. 258-264
-
Konferensbidrag (refereegranskat)abstract
- In this study a thermo-mechanical numerical simulation of the machining operation is presented. The purpose of the simulations is to obtain the residual stresses. The FE-simulations are compared to measurements of a machined axis. The reason for this work is to see if residual stress calculations have reached a level where it could be performed on a daily basis. Therefore, the simulations were performed with the software package DEFORM which has a re-mesh function that, for practical reasons, is necessary when forming chips. The large deformations will make the FE-analysis to costly otherwise.The work includes a parametric study of machining parameters in order to foresee the impact on the residual stresses. These simulations have also been compared to measurements.The FE-simulations has proved to predict the residual stresses in principle. However, even though the stress gradient in the vicinity of the surface is captured the exact stress level on the surface could not be foreseen. This effect was attributed to the re-mesh function. The parametric study showed that residual stresses can be foreseen, but not all the way up to the surface. Simulated results are only valid from approx 0.05mm-0.1mm below the surface. However, even with this restriction the FE-analysis can be used for optimising the cutting parameters with respect to residual stresses.
|
|
| 3. |
- Abdoli, Shiva, et al.
(författare)
-
Analyzing the Environmental Consequences of Production Processes from a System of Systems Perspective : A Case of Gear Manufacturing in the Automotive Industry
- 2021
-
Ingår i: The 28th CIRP Conference on Life Cycle Engineering, March 10 – 12, 2021, Jaipur, India. - : Elsevier BV. - 2212-8271. ; 98, s. 376-381
-
Konferensbidrag (refereegranskat)abstract
- Many research studies have been done to investigate different aspects of environmental challenges. In the product development context, there have been attempts to reduce the environmental impacts of associated activities including the production processes themselves. As a result, various technological improvements have been made and new production processes e.g. powder metallurgy technologies have been introduced that may demonstrate a lower environmental footprint compared to conventional processes e.g. cutting machining technologies. However, a production process with a lower environmental impact may lead to reducing the quality/performance attributes of the produced parts (gear) and probably of final products (transmission box). Therefore, the efforts intended to produce more sustainable products by using production processes with less environmental footprints may lead to some unintended consequences such as increased maintenance requirements and/or demand. This is a rebound effect from a system of systems (SoS) perspective. This paper aims to analyze the impacts of more environmentally friendly production processes on the total environmental impact associated with a product given they may have a negative impact on a part/product's quality and performance or usage. This paper introduces a methodological approach to analyze the environmental sustainability of a production process at a SoS level. This is done by including the entire supply chain of a product-system and its interacting systems by using the results of the attributional/consequential life cycle assessment (LCA) method. The approach validity approach is demonstrated in the case of gear manufacturing in the automotive industry.
|
|
| 4. |
- Abdullah Asif, Farazee Mohammad, 1980-, et al.
(författare)
-
A practical ICT framework for transition to circular manufacturing systems
- 2018
-
Ingår i: Procedia CIRP. - : Elsevier. - 2212-8271. ; , s. 598-602
-
Konferensbidrag (refereegranskat)abstract
- The transition towards a circular economy has become important. Manufacturing industry being a major stakeholder in this transition has started exploring the potential of this transition and challenges in implementation. Ambitious companies such as Gorenje d.d. has taken the circular economy transition seriously and aims to become a pioneer in implementing circular manufacturing systems. One vital step in this transition is the business model shift from the linear (sales model) to a circular model such as 'product as a service'. This brings new challenges to Original Equipment Manufacturers (OEMs) that have never been experienced in their conventional businesses. One of the challenges is to establish an information communication and technology (ICT) infrastructure that enables information management and sharing as well as establishes a real-time communication between relevant stakeholders. Outlining such an ICT infrastructure is the objective of this paper.
|
|
| 5. |
- Adamson, Göran, 1958-, et al.
(författare)
-
A Cloud Service Control Approach for Distributed and Adaptive Equipment Control in Cloud Environments
- 2016
-
Ingår i: Procedia CIRP. - : Elsevier. - 2212-8271. ; 41, s. 644-649, s. 644-649
-
Tidskriftsartikel (refereegranskat)abstract
- A developing trend within the manufacturing shop-floor domain is the move of manufacturing activities into cloud environments, as scalable, on-demand and pay-per-usage cloud services. This will radically change traditional manufacturing, as borderless, distributed and collaborative manufacturing missions between volatile, best suited groups of partners will impose a multitude of advantages. The evolving Cloud Manufacturing (CM) paradigm will enable this new manufacturing concept, and on-going research has described many of its anticipated core virtues and enabling technologies. However, a major key enabling technology within CM which has not yet been fully addressed is the dynamic and distributed planning, control and execution of scattered and cooperating shop-floor equipment, completing joint manufacturing tasks.In this paper, the technological perspective for a cloud service-based control approach is described, and how it could be implemented. Existing manufacturing resources, such as soft, hard and capability resources, can be packaged as cloud services, and combined to create different levels of equipment or manufacturing control, ranging from low-level control of single machines or devices (e.g. Robot Control-as-a-Service), up to the execution of high level multi-process manufacturing tasks (e.g. Manufacturing-as-a-Service). A multi-layer control approach, featuring adaptive decision-making for both global and local environmental conditions, is proposed. This is realized through the use of a network of intelligent and distributable decision modules such as event-driven Function Blocks, enabling run-time manufacturing activities to be performed according to actual manufacturing conditions. The control system’s integration to the CM cloud service management functionality is also described.
|
|
| 6. |
- Agic, Adnan, 1967-, et al.
(författare)
-
Influence of cutting edge geometry on force build-up process in intermittent turning
- 2016
-
Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 46, s. 364-367
-
Tidskriftsartikel (refereegranskat)abstract
- In the intermittent turning and milling processes, during the entry phase the cutting edges are subjected to high impact loads that can give rise to dynamical and strength issues which in general cause tool life reduction. In this study the effect of geometrical features of the cutting tool on the force generation during the entry phase is investigated. Cutting forces are measured by a stiff dynamometer at a high sampling frequency. In addition, the chip load area is analyzed and related to the measured cutting force. The results show that micro-geometrical features, in particular the protection chamfer, significantly affect the force generation during the entry phase.
|
|
| 7. |
- Agmell, Mathias, et al.
(författare)
-
The Influence the Uncut Chip Thickness has on the Stagnation Point in Orthogonal Cutting
- 2017
-
Ingår i: 16th CIRP Conference on Modelling of Machining Operations (16th CIRP CMMO). - : Elsevier BV. - 2212-8271. - 9781510842762 ; 58, s. 13-18
-
Konferensbidrag (refereegranskat)abstract
- The effect of cutting data on the stagnation zone of a machining operation is of great interest since it governs the material flow around the cutting edge. The material flow has a significant influence on the mechanical properties of the machined surface. This paper presents a numerical model that is able to determine the effect that the uncut chip thickness has on the stagnation zone and the connection between the stagnation zone and the deformation layer in the machined subsurface.
|
|
| 8. |
- Agmell, Mathias, et al.
(författare)
-
The link between plasticity parameters and process parameters in orthogonal cutting
- 2013
-
Ingår i: 14th CIRP Conference on Modeling of Machining Operations (CIRP CMMO). - : Elsevier BV. - 2212-8271. ; 8, s. 224-229
-
Konferensbidrag (refereegranskat)abstract
- In the present study the plasticity parameters in the Johnson Cook plasticity model are determined on the basis of process parameters in orthogonal cutting by use of inverse analysis. Previously established links between material parameters and process parameters in the cutting process such as chip thickness ratio, cutting forces, temperatures, deformation zones, is used serve as a starting point in the inverse analysis. The material AISI 4140 is simulated using the model employed in [1], the Johnson Cook parameters being changed within an interval of ±30 %. The inverse analysis is performed using a Kalman filter. The material model for the reference point is validated on the basis of the experimental results in [1], the model being shown to predict the process parameters with a high level of accuracy. The attempt is made to establish a link for materials having cutting process characteristics that are similar between certain process parameters and the Johnson Cook parameters in order to be able to predict the input parameters to FEM models using experimental data from a cutting process.
|
|
| 9. |
- Alhusin Alkhdur Mohammed, Abdullah, 1980-, et al.
(författare)
-
Advanced human-robot collaborative assembly using electroencephalogram signals of human brains
- 2020
-
Ingår i: Procedia CIRP. - : Elsevier B.V.. - 2212-8271. ; , s. 1200-1205
-
Konferensbidrag (refereegranskat)abstract
- This paper introduces an intelligent system that can manipulate an industrial robot using the electroencephalogram signals of human brains to perform collaborative assembly tasks. The system is initiated by capturing the brain signals using a wearable headset, and the signals are then filtered to remove any possible artifact. Consequently, the process continues by identifying the brain signals patterns using a classifier based on pre-recorded samples. The classifier's output determines the proper matching of the robot command that is intended by the human. To validate the results, an industrial collaborative assembly scenario of a car manifold is examined as a case study.
|
|
| 10. |
- Amouzgar, Kaveh, 1980-, et al.
(författare)
-
Optimizing index positions on CNC tool magazines considering cutting tool life and duplicates
- 2020
-
Ingår i: Procedia CIRP. - : Elsevier. - 2212-8271. ; 93, s. 1508-1513
-
Tidskriftsartikel (refereegranskat)abstract
- Minimizing the non-machining time of CNC machines requires optimal positioning of cutting tools on indexes (stations) of CNC machine turret magazine. This work presents a genetic algorithm with a novel solution representation and genetic operators to find the best possible index positions while tool duplicates and tools life are taken in to account during the process. The tool allocation in a machining process of a crankshaft with 10 cutting operations, on a 45-index magazine, is optimized for the entire life of the tools on the magazine. The tool-indexing time is considerably reduced compared to the current index positions being used in an automotive factory.
|
|
