University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Inverse Engineering in the world of Glass Blowing. DLochegnies

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Our Team in a few words… Creation in 90’, Modelling of glass forming and tempering  identification, inverse engineering, Applied research, technological solutions, Support of industrial partners, Euromech 388, MGFT2002.

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 The industrial requests

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 What is the optimum adjustment of the process parameters? First-level industrial problems to be solved?

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 First-level industrial problems to be solved? Why is that or that processing possible? or unpossible?

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Interests of the modelling in first level Inner vision of the process : Glass Flow, Contact, Temperature Evolution. Better understanding: Thermal and Mechanical  phenomena, Forming processes. Memory effect : Process adjustments, Success and un-success.

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 How to process in first modelling? Objective to reach : Shape of glass, thickness, distribution, Temperatures, Stresses. Development of the numerical model: Complexity of the model, Integration of the  phenomena. Adjustment and validation : Measurements on the process, Representativeness of the ind. reality.

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 The industrial requests…

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 How can I change my glass forming process or design a new one? Second-level industrial problems to be solved?

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 What are the limitations to create the designer’s product? What about the relation Design-Manufacture?

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Aided-design : Sensitivity analysis, Inverse Method, Virtual optimizer, Inverse Engineering. How to process in second modelling?

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Our research area

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Team research topics Identification of properties, Process modelling, Inverse engineering, Control.

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Process modelling

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Glass blow-and-blow Presented in M.G.F.T Valenciennes -F Piercing Elongation Blowing

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Robotized glass blowing Published in Engineering with Computers

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques ,5 0 Process Properties Sensitivity analysis Density Convection Glass ViscosityGlass Spec.Heat Glass temp. Shaping timeBlowing duration

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Inverse Method

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Error function : Error(p 1,p 2,p 3 ……) = ½  [Obj.–Num.(p 1,p 2,p 3 ……)] 2 Points Inverse method – the basis Industrial constraints : Possible temperatures : [T mini, T maxi ], Production rate : t < t maxi …. Penalty functions :  j /  j (p 1,p 2,p 3 ……).

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Computation of the correction dp : [ J T J + I + H ] k {dp} k = - { J T r + g } k J : 1rst derivatives of Num. / p i, g : 1rst derivatives of Pen. F. /p i, H : 2nd derivatives of Pen. F. /p i, r : Obj. - Num, : convergence accelerator. Inverse method – the kernel Schnur-Zabaras algorithm.

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Inverse method – the algorithm Initial data : 0 = 0. Computation of the initial error function. Computation of k = k. Computation of the current error function Error (p 1,p 2,p 3 …) k.

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Identification of properties

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Thermal contact resistance Presented in E.S.G Montpellier -F

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Thermal resistance – the identification Initial temperature of glass = 1100°C Initial temperature of mould = 430°C Pressure = 2 bar THERMAL RESISTANCE Time (s) Temperature (°C)

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Thermal exchange Published in Glass Tech. Ber T(K) Temps F.D. thermal model 1D

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Glass viscosity Published in Glass Tech. Ber lengthening Time

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Inverse Engineering

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 The initial shape of the parison Initial temperature of the glass Pressure in the step of blowing in the open air Time of elongation + Parison shape – the problem? Initial temperature of the glass Pressure in the step of blowing in the open air Time of elongation

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 A B C D AE: Curve of Bezier Parison shape – the unknowns? Presented in E.S.G Edimburgh - UK

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Error function : Error (px 1,py 1,px 2 ……) = ½  [Thick.–Thick( px 1,py 1,px 2 ……) ] 2 Points Parison shape – Inverse engineering Industrial constraints : Blowing attached to the parison elongation, Pressure level : p < p maxi, Glass temperature : T mini < T glass < T maxi

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Parison shape – Inverse engineering

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Parison shape – the modeling solution 0.070m 0.325m 0.048m 0.055m 0.12m At the end Before blowing After shaping

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Conclusions & perspectives

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Conclusions Process modelling : first-level industrial problems, Inverse engineering : second-level industrial problems, identification of properties. Accuracy of the models and the measurements

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Our current activities in glass blowing Identification : Thermal resistance, Integration in FEM code. Inverse Engineering : Blow-and-blow – Courval.

University of Valenciennes - L.A.M.I.H 15 th Technical Exchange Conference – Arques 2003 Acknowledgements Mr D. Lalart, Dr P. Moreau. Mr J. Kennedy, Mrs P. Meade,