High accuracy machines on factory floors

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High accuracy machines on factory floors. Anthonie Boogaard. What are high accuracy machines?. Photolithographic tools Healthcare machines Large printers. What is the problem?. Electronic products getting smaller Production technique of desktop processors by Intel 3 μ m in 1978 - PowerPoint PPT Presentation

Transcript of High accuracy machines on factory floors

Missie en Visie TU Delft

High accuracy machines on factory floorsAnthonie Boogaard#Challenge the futureWhat are high accuracy machines?

Photolithographic toolsHealthcare machinesLarge printers#Challenge the futureWhat is the problem?Electronic products getting smallerProduction technique of desktop processors by Intel3 m in 197832 nm in 2010Disturbances from the floorDynamic couplingFloor vibrations

#Challenge the futureResearch topicsInvestigate the dynamic behavior of factory floors and propose a method to properly predict the dynamic coupling between the machine and the floor it is placed on.

Develop a method to predict the new vibration level of the floor, based on the dynamic response and the free vibration level.#Challenge the futurePresentation outlineIntroductionExisting methods for floor disturbancesFrequency Based SubstructuringGround Vibration TransmissionExperimental validationResultsComparisonConclusion and recommendationsQuestions

#Challenge the futureExisting methodsDynamic coupling

FixedSimpleOnly true for infinitely stiff floorsFloor stiffnessMore advancedResemblance of reality?SDOF floorAdvancedNeeds more information about the floor#Challenge the futureExisting methodsFloor vibrations

Directly on the mountsSimpleOnly true for infinitely stiff floorsOn the fixed worldTakes floor stiffness into accountMore realistic?#Challenge the futureFrequency Based Substructuring

floorCompatibilityEquilibrium#Challenge the futureFrequency Based SubstructuringDynamic equilibrium of the machine:

Interface forces defined with Lagrange multiplier

Dynamic flexibility#Challenge the futureFrequency Based SubstructuringSummarizing:

Solving this set of equations and neglecting the applied forces on the floor yields

#Challenge the future10Frequency Based SubstructuringDynamic flexibilityFor the machineFull matrix is needed, as if it is floating freeCan be easily obtained from the modelFor the floorCan be obtained from a model of the buildingDifficult to model a building accuratelyOnly interface flexibility is neededSolution: dynamic measurements#Challenge the futureGround vibration transmission

floor

floor#Challenge the futureExperimental validationTest case model

Coupling with rotationsCoupling with translations#Challenge the futureExperimental validationTest case construction

#Challenge the futureExperimental validationMeasurementsFloor measurementImpact measurement on a flexible floorTest case measurement on a very stiff floorAssume fixed responseObtain free description from fixed measurementValidation measurementTest case measurement on the flexible floor of step 1

#Challenge the futureFloor measurement

#Challenge the futureExperimental resultsCoupling

#Challenge the futureExperimental validationVibration measurementMeasure vibration level of the flexible floor with and without test case.Shaker with a small mass to provide equal excitations for both measurementsShaker excitation: 12 and 16 Hz

floor#Challenge the futureExperimental resultsGround vibration transmission

#Challenge the futureComparison coupled responseRecap

FixedFloor stiffnessSDOF floor

#Challenge the futureComparison coupled response Fixed and floor stiffness

#Challenge the futureComparison coupled response Fixed and SDOF floor

#Challenge the futureComparison coupled response SDOF floor measurement

#Challenge the futureComparison floor vibrations Vibrations of the tool

#Challenge the futureWhen should this method be applied?

#Challenge the futureConclusionsIt is possible to predict the coupled response of a machine using the FBS technique and dynamic floor measurements.Single driving point coupling is a very good approximationSimple SDOF floor is a good approximation.Assuming a linearized floor stiffness is not always a good approximationIn most cases it is no better approximation than assuming an infinitely stiff floor.Ground vibration transmission technique was not validated.

#Challenge the futureRecommendationsAlways use the FBS method for floors with a low eigenfrequency, or when the mounting stiffness is equal to the floor stiffness.Specify a floor stiffness and a fundamental frequency for the floor, to ensure proper operation of the machine.Build a database with floor measurements.Perform a model study with typical machinery.Validate ground vibration transmission technique on a much simpler test case.Design a test case where one has more control over the test conditions.#Challenge the futureThank you

Questions?

#Challenge the future