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Model-based Identification of Dynamic Stability of Machining System
KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.ORCID-id: 0000-0001-9185-4607
KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
2008 (Engelska)Ingår i: 1st International Conference on Process Machine Interaction - Proceedings, 2008, s. 41-52Konferensbidrag, Publicerat paper (Refereegranskat)
Ort, förlag, år, upplaga, sidor
2008. s. 41-52
Nyckelord [en]
Machining system, modelling, dynamic stability, in-process identification
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:kth:diva-25878OAI: oai:DiVA.org:kth-25878DiVA, id: diva2:360395
Konferens
1st International Conference on Process Machine Interaction, Hannover, Germany, 2008
Anmärkning
QC 20101103Tillgänglig från: 2010-11-03 Skapad: 2010-11-03 Senast uppdaterad: 2011-11-23Bibliografiskt granskad
Ingår i avhandling
1. Model-Based Investigation of Machining Systems Characteristics: Static and Dynamic Stability Analysis
Öppna denna publikation i ny flik eller fönster >>Model-Based Investigation of Machining Systems Characteristics: Static and Dynamic Stability Analysis
2008 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The increasing demands for precision and efficiency in machining call for new control strategies for machining systems based on the identification of static and dynamic characteristics under operational conditions. By considering the machining system as a closed-loop system consisting of a machine tool structure and a machining process, the join system characteristics can be analyzed. The capability of a machining system is mainly determined by its static and dynamic stiffness.

The goal of this thesis is to introduce some concepts and methods regarding the identification of machining system stability. Two methods are discussed, one for the static behaviour analysis of a machine tool, and one for dynamic stability of a machining system. Preliminary results are indicating unambiguous identification of capabilities of machining systems static and dynamic characteristics.

The static behaviour of a machine tool is evaluated by use of a loaded double ball bar (LDBB) device. The device reproduces the real interaction between the join system, the machine tool elastic structure and the cutting process. This load is not equivalent to real cutting forces, but it does have a similar effect on the structure. This has been investigated both trough simulation and experimental work.

It is possible to capture the process – ­machine interaction in a machining system by use of the model-based identification approach. The identification approach takes into consideration this interaction and can therefore be used to characterize the machining system under operational conditions. The approach provides realistic prerequisites for in-process machining system testing. The model parameters can be further employed for control and optimization of the cutting process. Using different classification schemes, the model-based identification method is promising for the detection of instability.

Furthermore, it is the author’s belief that a model-based stability analysis approach is needed to exploit the full potential of a model driven parts manufacturing approach.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2008. s. ix, 62
Serie
Trita-IIP, ISSN 1650-1888 ; 08-13
Nyckelord
Machining systems, modelling
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-9754 (URN)978-91-7415-196-1 (ISBN)
Presentation
2008-12-15, Brinellsalen M312, Brinellvägen 68, KTH, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20101103Tillgänglig från: 2008-12-11 Skapad: 2008-12-09 Senast uppdaterad: 2010-11-03Bibliografiskt granskad
2. A Computational Framework for Control of Machining System Capability: From Formulation to Implementation
Öppna denna publikation i ny flik eller fönster >>A Computational Framework for Control of Machining System Capability: From Formulation to Implementation
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Comprehensive knowledge and information about the static and dynamic behaviour of machine tools, cutting processes and their interaction is essential for machining system design, simulation, control and robust operation in safe conditions. The very complex system of a machine tool, fixture and cutting tools during the machining of a part is almost impossible to model analytically with sufficient accuracy. In combination with increasing demands for precision and efficiency in machining call for new control strategies for machining systems. These strategies need to be based on the identification of the static and dynamic stability under both the operational and off-operational conditions. To achieve this it is necessary to monitor and analyze the real system at the factory floor in full production. Design information and operational data can then be linked together to make a realistic digital model of a given machining system. Information from such a model can then be used as input in machining simulation software to find the root causes of instability.

The work presented in this thesis deals with the static and dynamic capability of machining systems. The main focus is on the operational stability of the machining system and structural behaviour of only the machine tool, as well.

When the accuracy of a machining system is measured by traditional techniques, effects from neither the static stiffness nor the cutting process are taken into account. This limits the applicability of these techniques for realistic evaluation of a machining system’s accuracy. The research presented in this thesis takes a different approach by introducing the concept of operational dynamic parameters. The concept of operational dynamic parameters entails an interaction between the structural elements of the machining systems and the process parameters. According to this concept, the absolute criterion of damping is used to evaluate the dynamic behaviour of a machining system. In contrast to the traditional theory, this methodology allows to determine the machining system's dynamic stability, in real time under operating conditions. This framework also includes an evaluation of the static deformations of a machine tool.  In this context, a novel concept of elastically linked system is introduced to account for the representation of the cutting force trough an elastic link that closes the force loop. In addition to the elastic link which behaves as a static element, a dynamic non-contact link has been introduced. The purpose is to study the non-linear effects introduced by variations of contact conditions in joints due to rotational speed.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2011. s. xv, 97
Serie
Trita-IIP, ISSN 1650-1888 ; 11:11
Nyckelord
Machining system, Stability, Statistical Dynamics, Elastic Linked System (ELS), Operational Dynamic Parameters (ODP), Loaded Double Ball Bar (LDBB), Virtual Machining System Engine (VMSE), Contactless Excitation and Response System (CERS).
Nationell ämneskategori
Produktionsteknik, arbetsvetenskap och ergonomi
Forskningsämne
SRA - Produktion
Identifikatorer
urn:nbn:se:kth:diva-48824 (URN)978-91-7501-162-2 (ISBN)
Disputation
2011-12-05, F3, Lindstedtsvägen 26, KTH, Stockholm, 09:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
XPRES - Initiative for excellence in production research
Anmärkning
QC 20111123Tillgänglig från: 2011-11-23 Skapad: 2011-11-23 Senast uppdaterad: 2012-06-19Bibliografiskt granskad

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