EFD_Lecture_(EFD_and_UA) - Experimental Fluid Dynamics and...

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Unformatted text preview: Experimental Fluid Dynamics and Uncertainty Assessment Methodology S. Ghosh, M. Muste, F. Stern Table of Definition & purpose EFD philosophy EFD Process Types of measurements & instrumentation Measurement systems Uncertainty analysis 57:020 Laboratories 2 Experimental Fluid Dynamics Definition: Experimental Fluid Dynamics: Use of experimental methodology and procedures for solving fluids engineering systems, including full and model scales, large and table top facilities, measurement systems (instrumentation, data acquisition and data reduction), dimensional analysis and similarity and uncertainty analysis. Purpose: Science & Technology: understand and investigate a phenomenon/process, substantiate and validate a theory (hypothesis) Research & Development: document a process/system, provide benchmark data (standard procedures, validations), calibrate instruments, equipment, and facilities Industry: design optimization and analysis, provide data for direct use, product liability, and acceptance Teaching: Instruction/demonstration A pretty experiment is in itself often more valuable than twenty formulae extracted from our minds." - Albert Einstein 3 EFD Philosophy DEFINE PURPOSE OF TEST AND RESULTS UNCERTAINTY REQUIREMENTS UNCERTAINTY ACCEPTABLE? IMPROVEMENT POSSIBLE? DETERMINE ERROR SOURCES AFFECTING RESULTS YES NO NO YES YES YES NO SELECT UNCERTAINTY METHOD ESTIMATE EFFECT OF THE ERRORS ON RESULTS- MODEL CONFIGURATIONS (S)- TEST TECHNIQUE (S)- MEASUREMENTS REQUIRED- SPECIFIC INSTRUMENTATION- CORRECTIONS TO BE APPLIED- DESIRED PARAMETERS (C , C ,....) D R DESIGN THE TEST- REFERENCE CONDITION- PRECISION LIMIT- BIAS LIMIT- TOTAL UNCERTAINTY DOCUMENT RESULTS NO TEST CONTINUE TEST IMPLEMENT TEST SOLVE PROBLEM RESULTS ACCEPTABLE? MEASURE- MENT SYSTEM PROBLEM? NO PURPOSE ACHIEVED? YES NO START TEST ESTIMATE ACTUAL DATA UNCERTAINTY Decisions on conducting experiments are governed by the ability of the expected test outcome to achieve the experiment objectives within allowable uncertainties. Integration of UA into all test phases should be a key part of entire experimental program test design determination of error sources estimation of uncertainty documentation of the results 4 EFD Process EFD labs provide hands on experience with modern measurement systems, understanding and implementation of EFD in practical application and focus on EFD process: Test Set-up Facility & conditions Install model Prepare measurement systems Data Acquisition Data Reduction Uncertainty Analysis Data Analysis Initialize data acquisition software Run tests & acquire data Store data Statistical analysis Estimate bias limits...
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This note was uploaded on 12/08/2011 for the course MECHANICS 57:020 taught by Professor Fredrickstern during the Fall '10 term at University of Iowa.

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EFD_Lecture_(EFD_and_UA) - Experimental Fluid Dynamics and...

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