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Contents : Operational deflection shape analysis and vibration solving for a motion simulator. R.J. Jenneskens DCT 2006.135 Report international internship Startdate: Monday June 5th 2006 Enddate: Thursday January 18th 2007 Rob Jenneskens (R.J.) studentnr. 501016 Supervisor TU/e: Prof. Maarten Steinbuch Supervisor SNU: Prof. Jongwon Kim Section Control Systems Technology TU/e 2 Contents 1 Introduction 2 Eclipse-II 2.1 Eclipse-II Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 One-man Ride Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 Vibration Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Vibration Analysis 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Modal Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 Operational Deflection Shape (ODS) Analysis . . . . . . . . . . . . . . . . . . 4 ODS on One-man Ride 4.1 Introduction . . . . . 4.2 Set-up . . . . . . . . 4.3 Measurements . . . . Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 9 9 9 10 11 11 11 12 15 15 15 16 19 19 19 21 23 23 23 23 24 24 29 31 33 35 35 35 5 ODS Results 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Time Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3 Crosspower Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Design Modifications 6.1 Introduction . . . . . . . . . . . . . . . 6.2 Changing Mass Stiffness or Damping 6.3 Dynamic Vibration Absorber (DVA) . 6.4 DVA Requirements . . . . . . . . . . . 6.5 DVA Design . . . . . . . . . . . . . . . 6.6 DVA Implementation and Tuning . . . 7 Conclusions and Recommendations References A Equipment Procedure and Test Experiment A.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A.2 ODS Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 CONTENTS A.3 Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A.4 Test Experiment: "Modal Analysis of a Simple Plate" . . . . . . . . . . . . . 37 38 41 43 45 47 B Measurement Points C Time Signal D Design changes next prototype E Technical drawings List of Figures 2.1 2.2 3.1 4.1 4.2 5.1 5.2 5.3 6.1 6.2 6.3 6.4 A.1 A.2 A.3 A.4 A.5 One-man ride machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Major vibrations in the circular and vertical columns . . . . . . . . . . . . . . Animation in LMS Test.Lab . . . . . . . . . . . . . . . . . . . . . . . . . . . . Schematic presentation of the hardware set-up . . . . . . . . . . . . . . . . . Definition of the coordinate system . . . . . . . . . . . . . . . . . . . . . . . . Time signal of operating area (start-stop) . . . . . . . . . . . . . . . . . . . . Non-simultaneously stopping of the motors . . . . . . . . . . . . . . . . . . . The crosspower spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Simplified DVA . . . . . . . . . . . . SN-curve for aluminium . . . . . . . CAD drawing of the assembled DVA DVA mounted to vertical column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 10 12 15 16 19 20 21 25 27 28 29 35 36 38 39 39 41 42 43 48 49 The LMS Scadas III 310 data acquisition system B&K 4294 exciter with B&K 4506 accelerometer The test experiment set-up . . . . . . . . . . . . Test experiment: attached accelerometers . . . . Test experiment: FRF . . . . . . . . . . . . . . . B.1 Measurement points for first sequence . . . . . . . . . . . . . . . . . . . . . . B.2 Measurement points for second sequence . . . . . . . . . . . . . . . . . . . . . C.1 Time signal plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E.1 Technical drawings block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E.2 Technical drawings spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
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  • Verified : 2013-03-29
  • Source: alexandria.tue.nl
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