Parameterization of environmental influences by automated characteristic diagrams for the decoupled fluid and structural-mechanical simulations

• Autorzy: Glänzel Janine , Kumar Tharun Suresh , Naumann Christian , Putz Matthias

Identyfikatory

DOI

10.5604/01.3001.0013.0461

• Języki publikacji: EN

Abstrakty

EN

Thermo-elastic effects contribute the most to positioning errors in machine tools especially in operations where high precision machining is involved. When a machine tool is subjected to changes in environmental influences such as ambient air temperature, velocity or direction, then flow (CFD) simulations are necessary to effectively quantify the thermal behaviour between the machine tool surface and the surrounding air (fluid). Heat transfer coefficient (HTC) values effectively represent this solid-fluid heat transfer and it serves as the boundary data for thermo-elastic simulations. Thereby, deformation results can be obtained. This two-step simulation procedure involving fluid and thermo-structural simulations is highly complex and time-consuming. A suitable alternative for the above process can be obtained by introducing a clustering algorithm (CA) and characteristic diagrams (CDs) in the workflow. CDs are continuous maps of a set of input variables onto a single output variable, which are trained using data from a limited number of CFD simulations which is optimized using the clustering technique involving genetic algorithm (GA) and radial basis function (RBF) interpolation. The parameterized environmental influences are mapped directly onto corresponding HTC values in each CD. Thus, CDs serve as look-up tables which provide boundary data (HTC values along with nodal information) under several load cases (combinations of environmental influences) for thermo-elastic simulations. Ultimately, a decoupled fluid-structural simulation system is obtained where boundary (convection) data for thermo-mechanical simulations can be directly obtained from CDs and would no longer require fluid simulations to be carried out again. Thus, a novel approach for the correction of thermo-elastic deformations on a machine tool is obtained.

Słowa kluczowe

EN

thermal effects; simulation; machine tool; environment; positioning error

• Wydawca: Wydawnictwo Wrocławskiej Rady FSNT NOT
• Czasopismo: Journal of Machine Engineering
• Rocznik: 2019
• Tom: Vol. 19, No. 1
• Strony: 98--113
• Opis fizyczny: Bibliogr. 22 poz., rys., tab.

Twórcy

autor

Glänzel Janine

• Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz, Germany

autor

Kumar Tharun Suresh

• Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz, Germany

autor

Naumann Christian

• Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz, Germany

autor

Putz Matthias

• Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz, Germany

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).