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InternationalModalAnalysisConference

6th Internationa]Modal Analysis

ConferenceFebruary 1-4,1988

Hyatt OrlandoKissimmee, Florida

Volume I

DIRECTOR:Dominick J. DeMichele

UNION COLLEGEArnold E.S. Gussin, Dean, Graduate and Continuing StudiesRae D'Amelio, Administrator

SOCIETY FOR EXPERIMENTAL MECHANICS, INC.Kenneth A Galione, Managing Director

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Sponsored by: — •Union College

Schenectady, NY 12308Society for Experimental Mechanics, Inc.

Bethel, CT 06801

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T A B L E O F C O N T E N T S

PAGEGENERAL SESSION

Keynote Address: A Perspective View Of Modal Analysis xvii-xxi

L. 0. Mitchell

SESSION 1. EXPERIMENTAL CASE HISTORIES I

Modal Identification From Control Versus Structural Dynamics Views 1-7S. R. Ibrahim

Effects Of Data Acquisition Conditions On Modal Testing Of A Simple Structure 8-13Y. Soucy, D. W. Deering

Utilization Of Tools For Successful Troubleshooting Of Structural Problems 14-18C. D. Powell, R. C. Sohaney

Modal Analysis Of A Railway Bogie Frame For Freight Car 19-22P. Shen, Y. S. Hu, H. J. Shen

SESSION 2. ANALYTICAL METHODS I

Perturbation Approach For Determining Eigenvalues And Eigenvectors For Nonproportionally 23-29Damped Systems

D. L. Cronin

Modal Identities In Structural Dynamics 30-35B. P. Wang

Further Study On The Modal Damping Ratio Matrix For Multi-Degree Of Freedom System 36-41B. Jiang

On Resonance Of Lumped Mass Damped Linear Systems With Normal Modes 42-48A. D. S. Ross, D. J. Inman

SESSION 3. STRUCTURAL DYNAMICS MODIFICATION I

Localization Of Model Changes For Optimized System Matrices Using Modal Test Data 49-55J. C. O'Callahan, C-M. Chou

Identification Of Structural Vibration Control Parameters Using Modal Contributors 56-62E. W-Y. Lee, Y-T. Chung

Damage Assessment For Nonlinear Structures Using The Concept Of Structural Power 63-66F. D. Ju, C. F. Chang

The Active Simulation Of Structural Frequency Response Functions 67-72

T. Hodges, S. J. Elliott, P. A. Nelson

SESSION 4. LINKING ANALYSIS AND TEST I

Optimization Of Mathematical Model Via Selected Physical Parameters 73-79M. L. Wei, T. Janter

Predicting The Response Of Electronic Equipment In A Vibration Environment 80-86I. J. Dabney, J. M. O'Keefe, B. Riggall, G. Gallagher

A Comparison Between Modeloptimization Procedures Based On The Modeloptimization 87-92Parameter Set

T. Janter, P. Sas, W. Heylen

Model Refinement Through A Stat ist ical Analysis Of A Mode Shape Difference Vector 93-99J. C. Slater, B. Fatemi, A. R. Johnson, J . L. Wiederrich

SESSION 5. PROCESSING MODAL DATA I

Linear Recombination Of Mode Shape Pairs Having Near-Repeating Eigenvalues; Application To 100-106CRRES, A Shuttle Payload

F. W. Hausle, A. Stroeve

Advances Of Frequency Response Function Estimation In Modal Analysis 107-112L. Zhang, Y. Yao

On The Application Of Modal Parameter Estimation Using Frequency Domain Algorithms 113-120P. Ebersbach, H. I r re t ie r

Global Modal Parameter Estimation Combined With A Stat ist ical Criterion 121-128

W-Z. Wu, T-W. Lwo

SESSION 6. SEISMIC TOPICS

Base Isolation Techniques - A Survey 129-135P. R. Millarke

Modal Testing Of Large Reinforced Concrete Shear Wall Structure 136-142C. R. Farrar, M. M. Cottrell

Ambient Vibration Measurement And Analyses On Existing Tall Buildings In Hong Kong 143-149Z-W. Bao, J . M. Ko

Analysis Of Fuzzy Random Response Of Nonlinear Dashpot Excited By Motion Of Some Supports 150-153C-J. Chen

SESSION 7. MODAL TEST METHODS I

A Mass Additive Technique For Modal Testing As Applied To The Space Shuttle ASTRO-1 154-159Payload

A. D. Coleman, J . B. Anderson, T. C. D r i s k i l l , D. L. Brown

Quali f icat ion Of Frequency Response Functions Using The Rigid-Body Response 160-165D. 0. Smallwood, J . P. Lauffer

Correlation Of Operating Deflection Shapes And Modal Test Data 166-173M. J . Yeager, W. R. Shapton, R. W. Stevens

A Comparison Of Structural Frequency Response Functions Measured With Forces From 174-180500 to 250,000 l b .

V. I . Bateman

Modal Testing And Operational Vibration Measurements For A Ship Deckhouse Structure 181-184J. M. Komrower, M. P. Pakstys, D. S. Wright

The Inherent Error Of Modal Test And Countermeasures 185-188

G-T. Zheng, W-H. Huang, C-X. Shao

SESSION 8. MODAL TECHNIQUES FOR ROTATING MACHINERY I

Tracking Sine Waves In Systems With High Slew Rates 189-193H. Void, J . Crowley, J . Nessler

The Starting Of Non-Circular Rotors 194-200U. Hollburg

An Evaluation Of Beam And Shell Models For Hollow Conical Shafts 201-209T. A. Vest, M. S. Darlow

Modal Balancing Of Flexible Rotors With Data Acquisition From Non-Stationary Run-Up 210-216Or Run-Down

R. E. Markert

Ident i f i ca t ion Of Linearized Oil-Fi lm Coefficients On A Rotor-Bearing System 217-223Y-Y. Zhang, Y-B. Xie, Q-F. Meng

On The Self-Excited Oscil lat ions In A Centrifugal Compressor 224-229L. Yu, Y-B. Xie, J . Zhu, D. Qiu

A Study On Dynamic Boundary Conditions In The Method Of Component Mode Synthesis 230-235

J . Gao, S. Chen

SESSION 9. MODELING STRUCTURES I

Structure Dynamics Characterization Through Nonlinear Gain Modeling 236-242H-Y. Lai

Experimental Confirmation Of Time-Domain Modal Analysis Via Autoregressive Models In 243-249State Space

R. J . Helsel, H. A. Evensen, S. M. Pandit

The Random Structural Response Of A SDF System With Stiffness Degradation 250-256F. D. Ju, S-L. Lu

A Dynamic Analysis And Modeling System For 3-D Piping 257-263T. Hamada, T. Hirano, M. Fujiwara

Study On The Method Of Structural Modelling And I ts Application In the Machine Tool 264-268Structure Modelling

X. Chen, Z-L. Zhang

Ident i f ica t ion Of Nonlinearity And Modeling Of Cushions In Some Packages 269-271

Z. Han, X-Y. Zhu, Z-F. Fu

SESSION 10. SUBSTRUCTURING I

Remote Structural Damage Detection Via Substructuring 272-277W. B. Walton, P. Ibanez, G. Yessaie

Combination Of Stiffened Immersed Shells And Complex Internal Structures 278-284P. Dorey, C. Aval l e t

A Dynamic Substructuring Approach Based On Piecewise Elastodynamic Variational Principle 285-290R-H. Zhang

Energy-Based Modal Coupling Of Multi-Degree-Of-Freedom Substructures - A Finite Element 291-298Approach

B. W. Zastrau

Boundary Element Synthesis Method For Dynamical Substructures 299-301

J-M. Zhu, W. Sun

SESSION 11. NOISE/ACOUSTICS I

Calculation Of The Sound Intensity And Sound Radiation Eff iciency of Structures From 302-308Vibration Data

A. F. Seybert, R. KhuranaPrediction Of Structural Born Noise Based On The Modal Analysis 309-314

N. Okubo, Y. Tajima

Reduction Of In ter ior Sound Fields In Flexible Cylinders By Active Vibration Control 315-321J . D. Jones, C. R. Fuller

Rayleigh-Ritz Applied To Noise Transmission Studies 322-330L. R. Koval, M. Desai

Impact Noise Analysis Of The Fly-Shuttle Loom And Study Of Damping Treatment 331-336Q. Sun, S. Zhou, Q. Zhang, H. Yao

Noise Control Of A Silk Loom With Shuttles 337-342J . Pan, Y. Yang, Y. Fan, N. Lu, Y. Cheng, Z. Tong

SESSION 12. EXPERIMENTAL TECHNIQUES I

Practical Implementation Of External Intensity Modulated Fiber Optic Sensors For 343-349Structural Vibration Measurements

M. E. Patton, M. W. Trethewey

Fatigue Life Characterization Of Composite Structures Using The Random Decrement Modal 350-356Analysis Technique

D-N. Kung, G-Z. Qi, J . C. S. Yang, N. E. Bedewi

Frequency Response Function Estimation At Level 357-360R. Rodeman, N. T. Davie

Strategic Placement Of Accelerometers To Measure Forces By The Sum Of Weighted 361-368Accelerations

T. G. Priddy. D. L. Gregory, R. G. Coleman

Analysis Of Beam And Plate Vibration By A Hybrid Experimental-Numerical Method 369-375P. S. Sherman, Y. Y. Hung, J . D. Hovanesian

Automated Mode Shape Measurement By A Modulated-Fringe Holographic Interferometry 376-382Technique

P. S. Sherman, Y. Y. Hung, G. Gerhart

SESSION 13. ANALYTICAL METHODS I I

An Investigation To The Solution Of Component Modal Synthesis 383-388Y. G. Tsuei, E. K. L. Yee

A Frequency Domain Global Parameter Estimation Method For Multiple Reference Frequency 389-396Response Measurements

C-Y. Shih, Y. G. Tsuei, R. J . Allemang, D. L. Brown

On The Robustness Of Algorithms For The Computation Of The Pseudo Inverse For Modal 397-400Analysis

J . A. Brandon

Transient Vibration Analysis Of Nonproportionally Damped Linear Structures Using Modal 401-407Parameters

T. Abrahamsson, M. Lundblad

The Analysis Of Vibration Response Of The Structure With The Foundation Isolators Under 408-413Wind Load

Q. Feng

Vibration Analysis of Rectangular Plates With Arbitrarily Located Stiffeners 414-417Z. Zeng, T. Huang, J. F. Hamilton

SESSION 14. FINITE ELEMENT ANALYSIS I

Structural Analysis Methods And Models Used For The Evaluation Of A Radioactive Waste 418-420Transport Packaging

D. J. Nolan, A. G. Eggers

Evaluation Of Analytical Methods To Predict Constrained Layer Damping Behaviour 421-427S. L. Liguore, J. B. Kosmatka

Refinement Of Finite Element Model Of Thin Interfaces Using Experimental Modal Analysis 428-431For Comparison

T. Henriquez, E. McLaughlin, B. Montgomery, T. Ruggiero

Finite Element Analysis Of A Compressor Vane 432-437J. A. Kubiak, A. Carnero P., J. Aguirre R.

Application Of Finite Element Method To The Stability Analysis Of An Eccentrically 438-446Loaded Column By Slave Loads Including Damping

G. M. Arif, 0. Pettersson

Implementation Of Component Mode Synthesis In A Nonlinear Rotational Dynamics System 447-455J. A. Baird, M. C. Apostal, D. N. Wormley

SESSION 15. LINKING ANALYSIS AND TEST II

A Methodology For Integrating Test With Design And Analysis Using I-DEAS 456-463P. R. McDonald, G. H. Wiley

The Physical Significance Of The Modal Mass For Lightly Damped Structures 464-467D. Griffiths

Modal Test And Analysis Of Telephone Switching Cabinets 468-474S. Pazargadi, P. Bausch

Combined Experimental And Analytical Study Of A Waste-Water Pumping Facility 475-481J. Vandenhout, H. Zeischka, B. De Ruiter

Validation Of FEM Modal Analysis Using Holographic Interferometry 482-488

Q. B. Li, D. A. Malohn

SESSION 16. LANCZOS METHODS

Origins And Advantages Of Lanczos Vectors For Large Dynamic Systems 489-494I. U. Ojalvo

Lanczos Method For Dynamic Analysis Of Damped Structural Systems 495-500B. Nour-Omid, M. E. Regelbrugge

Some Applications Of Lanczos Vectors In Structural Dynamics 501-506R. R. Craig, Jr., H. M. Kim, T-J. Su

A Component Synthesis Method Using Lanczos Vectors 507-513

J. J. Allen

SESSION 17. MODAL TECHNIQUES FOR ROTATING MACHINERY II

Resonant Frequencies Of Stators Of Electrical Machines 514-520R. K. Singal, K. Williams

Modal Characteristics Of Turbomachine Blades In A Multi-Stage Engine 521-527D. Afolabi

Eigenvalue Algorithms For Stability And Critical Speeds Analysis Of Rotating Systems 528-535M. Geradin, N. Kill

Dynamics Of Overhung Rotors On Hybrid Gas Bearing 536-541K. S. Wang, M. B. Tsai, Y. Z. Wang

Modal Analysis And Balancing Of A Spacecraft Turbopump Rotor 542-548D. Bondoux, P. Frechon

Balancing A Flexible Rotor For Multiple Critical Speeds Using Modal Identification 549-554Techniques

P. Kopff

SESSION 18. STRUCTURAL DYNAMICS MODIFICATION I I

Comparison Of Complex And Proportional Mode Structural Dynamic Modification Techniques 555-565P. Av i tab i le , J . O'Callahan, J . Milani

The Estimation Of Rotational Degrees-Of-Freedom Using Shape Functions 566-571M. Mitchell-Dignan, G. C. Pardoen

A Sensi t iv i ty Analysis On The Eigen Solutions Of Linearly Damped System 572-578J-H. Kuang, L-S. Chen

Study On The Stiffness Of The Flange Joints Connected Between The Thin Wall Beams 579-582X. Guo, E. Han

Correcting Finite Element Models With Measured Modal Results Using Eigenstructure 583-587Assignment Methods

C. Minas, D. J. Inman

SESSION 19. ANALYTICAL METHODS III

External Force Estimation From Transient Response Data 588-593R. Rodeman, R. G. Bell

An Improved Component Mode Synthesis Method—Statically Determinated Interface Method 594-597A. Chen, Y. Fang

A New Solution Of Constant Di f ferent ia l Equation Group By Dif ferent ial Operator And 598-602Application In Calculating Rol l ing-Mil l Torsional Vibration

C-S. J i

On-Line Estimation And Control Of Noise In Hydraulic Servo Systems 603-607Q. Pang

Admittance Modeling: Frequency Domain, Physical Coordinate Methods For Multi-Component 608-614D. A. Kienholz, K. E. Smith

A SVTM Technique For Modaling Analysis Of Thick Cylindrical Shells With Arbitrary 615-619Boundary Conditions

H-Y. Ni , Z-Y. Weng

SESSION 20. TRANSDUCERS & INSTRUMENTATION

System Support For Spatial Sine Testing 620-628M. J. Lally, D. L. Brown, A. J. Severyn, H. Void

Non-Contact Vibration Imager For Wide Range Of Component Sizes And Displacement Amplitudes 629-638D. Oliver

Piezo Film Vibration Sensors--New Techniques For Modal Analysis 639-645R. H. Brown

Ultra-Low Frequency Vibration Data Acquisition Concerns In Operating Flight Simulators 646-652B. W. Van Hoy

A New St ruc tu re Of S t ra in Dynamometer For Measuring Cut t ing Forces In Modal Test Of 653-657Machine Tool

L. J . Ca i , D. W. Ping, C. H. Ku, Z. J . Yuan

SESSION 21. LINKING ANALYSIS AND TEST III

Correction Of A Finite Element Model By Input-Output Measurements With Application To 658-665A Radar Tower

C. Hoff, H. G. Natke

Experimental Modal Analysis Vs. Power Flow Measurement - Some Recent Developments 666-672P. Hagedorn, S. Sparschuh

Analysis And Test In Modelling Of Spar Structure Assessment And Review 673-678M. M. Saxena

PIAGGIO P180 - Aircraf t Flutter Clearance Program. Comparison Between Flight Flutter 679-689Tests And Analytical Results

P. G. Chiarlone, D. Miranda

Spatial Correlation Of Mode Shapes,The Coordinate Modal Assurance Criterion (COMAC). 690-695N. A. J . Lieven, D. J . Ewins

Estimation Of Uncorrelated Content In Experimentally Measured FRF's Using Three 696-700Measurement Channels

R. E. Cobb, L. D. Mitchell

SESSION 22. PROCESSING MODAL DATA II

Using Complex Frequency Response Functions To Determine System Matrices Of Vibratory 701-704Systems

C. W. Johnson, V. W. Snyder

Comparison Of Modal Parameter Estimation Methods For Highly Damped Structures 705-711R. D. B r i l l h a r t , S. M. Crowley, D. L. Hunt

Mixed Spectral Analysis Of The Vibration Signals Sampled On Tour 712-716Y-S. Zhang, L-Y. Y i , D-P. Gao

On A Curve-Fitting Algorithm For Modal Parameter Estimation 717-723T. Cioara

A Method Of Ident i fy ing Dynamical Parameters Of Structural Joints 724-726D. Yu, J. Song, Z. Peng

An Effective Approach To The Complex Modal Parameter Identification With A Microcomputer 727-732X-Y. Wang, Z-J. Zhang, W-P. Dong

SESSION 23. MODAL TEST METHODS II

An Experimental Study Of Time Delay Compensation In Active Structural Control 733-739S. McGreevy, A. M. Reinhorn, T. T. Soong

Use Of The Multivariate Mode Indicator Function For Normal Mode Determination 740-744M. Nash

A Method Of Determining The Modes Of Vibration Of Disc Drive Heads And Suspensions During 745-750Operation

J. Castagna

The Identification Of Dynamic Environment And The Identification Of Dynamic Environment 751-754Together With Modal Parameters Or Physical Parameters

G-T. Zheng, W-H. Huang, C-X. Shao

Experimental Approach To Dynamic Characteristics Of Universal Milling Machine 755-761

B. Liao, Z. Chen, W-P. Zheng

SESSION 24. MODELING STRUCTURES II

Multivariate Nonlinear Structure Identification With Applications 762-768H-Y. Lai

Dispersion Of Congressional Guided Waves When Coupled With Flexural Waves Along The 769-776Walls Of The Duct

V. Martin

A General Identification Of A Nonlinear Single-Degree-Of-Freedom System Under Sinusoidal 777-782Excitation

P. Ibanez

On Line Extraction Of Offshore Towers Vibration Parameters From Response Measurements 783-788K. A. F. Moustafa

On The Fitting of Structural Models to Data 789-793S. Braun, Y. Ram

On The Application Of The Perturbation Method In The Complex Modal Analysis 794-797W-Z. Zheng

Model Reduction For Rotor-Bearing Systems 798-804H-A. Zhu, Y-B. Xie, L. Yu

Total Least Squares Methods In Modal Software 805-811R. Turunen

SESSION 25. FINITE ELEMENT ANALYSIS I I

Improvement Of The Dynamic Model Of A Roots Blower By Means Of Results From 812-819Experimental Modal Analysis

R. Nordmann, F. Steinwender

On The Accuracy Of Nonlinear Dynamic Analysis Of Structures Modeled By Finite Elements 820-826M. R. Resheidat

Vibrational And Acoustical Behaviour Of Complex Structural Configurations Using Standard 827-833Finite Element Program

F. Marulo, L. Lecce, A. Paonessa

Visualization Of The Mode Shape Contents Of Broad-Band Response Measurements 834-840S. D i l l inger , K. Muhlbauer

Vibration Analysis Of Rotating Blades Using Finite Element Techniques 841-847

A. S. Panwalkar, A. Rajamani

SESSION 26. SPACE STRUCTURES I

Modal Testing Of A Very Flexible 110 m Wind Turbine Structure 848-855T. G. Carne, J . P. Lauffer, A. J . Gomez, H. Benjannet

Distributed Transducers For Smart Structural Components 856-862J . E. Hubbard, Jr .

Modal Survey And Test-Analysis Correlation Of The Space Shuttle SRM 863-870R. D. B r i l l h a r t , D, L. Hunt, D. C. Kammer, B. M. Jensen, D. R. Mason

Shock Damping Application To Launcher/Satellite Interface 871-875

M. Bonnet, B. Gamier, B. Vernozy

SESSION 27. ANALYTICAL METHODS IV

Lumped Systems With Non-Proportional Damping 876-882J . Bel los, D. J . Inman

Modal Stabi l isat ion Of A Class Of Distributed Parameter System 883-886V. K. Jain, K. K. Tripathi

Mechanical Parameters Iden t i f i ca t ion , Especially Considering The Noise Effect 887-893J-H. Wang

A Method For The Direct Ident i f icat ion Of Modal Parameters Via Physical Parameters Of 894-900Local Modes

Y. Chen, N. Lu, Y. Cheng, Z. Tong, Y. Sun

On Mathematical Model For Direct Parameter Ident i f icat ion In Frequency Domain 901-903Y. Cheng, Z. Tong, X. Zou, Y. Sun

Dynamic Analysis of Circular Plates With Stiffeners Using Lagrange Mult ipl iers 904-907Z. Zeng, T. Huang, J . F. Hamilton

SESSION 28. MACHINERY DIAGNOSTICS I

On-Line Vibration Monitoring And Analysis System At The Paducah Gaseous Diffusion Plant 908-913D. M. Herricks, W. D. Strunk

Considerations For The Establishment Of A Machinery Monitoring And Analysis Program For 914-920Surface Ships Of The U. S. Navy

W. D. Strunk

A Feasibility Study For The Application Of Frequency Monitoring Techniques In Quality 921-927Control

K. Wyckaert, R. Snoeys, P. Sas

Understanding Operating Deflection Shapes 928-933D. A. Corelli

Automatic Diagnosis For Fatigue Failure Of Ball Bearing 934-938B. Tang, X. Wen, B. Wang, X. Fan

SESSION 29. DESIGN METHODS

An Exercise In The Design, Analysis And Test Of An Electronics Cabinet 939-946R. E. Coleman, G. H. Wiley

Interactive Modal Animation And Structural Modification 947-952R. B. Katnik, C-H. Yu, W. L. Wolf

Vibration Analysis Of Continuous Beams With A rb i t r a r i l y Spaced Intermediate Supports 953-959A. K. Mi tche l l , C. R. Hazel!

The Optimal Design Of Isolator In Aerospace Equipment 960-965Y. Z. Wang, K. S. Wang, S. S. Tsai

Sensi t iv i ty Analysis And Optimization For The Modal Parameters Of Structural Vibration 966-972S. She, R. Liu

SESSION 30. VEHICULAR

Using Vibratory And Modal Analysis To Reduce Vibrations And Noise In An Automotive Engine 973-979P. Rissone, C. Braccesi, M. Carfagni

A Sensi t iv i ty Analysis Using Frequency Response Function 980-986H. Noguchi, I . Terui, Y. Urushiyama

On The Relation Between The Stiffness Of A Car Body And NVH 987-993K. Abe, S. Kojima, T. Itabashi, T. Isono, Y. Habara

Application Of The Modal And Sensitive Analysis On The Automobile 994-999S-L. Huang, L-M. Chen

Dynamic Performance Analysis Of A Vehicle 1000-1008A. Salehzadeh-Nowbari

Modal Analysis Of Articulated Off-Road Vehicles And Machinery 1009-1014P. W. Claar I I , L. Xie

SESSION 31. STRUCTURAL DYNAMICS MODIFICATION I I I

Active Vibration Control Of Flexible Structure By Eigenstructure Assignment Technique 1015-1019Q. Zhang, J . Y. H. L iu , Y. G. Tsuei, R. J . Allemang

The Use Of Modal Participation Factors To Enhance Modal Vector Scaling 1020-1025M. L. Wei, R. J . Allemang, D. L. Brown

Prediction Of Mass Modification For Desired Natural Frequencies 1026-1032Q. Zhang, R. J . Allemang, D. L. Brown, W. Wang

Simultaneous Structural Dynamics Modification (S2DM) 1033-1038M. Richardson, P. Wallack, P. Skoog

Model Correlation And Orthogonality Cr i ter ia 1039-1047P. Avi tabi le , J . O'Callahan, J . Milani

The Use of Smoothing Techniques For Structural Modification Applications 1048-1052J . Lipkens, U. Vandeurzen

SESSION 32. SPACE STRUCTURES I I

Structural Dynamics Ident i f icat ion In The Time Domain: Estimation Of Modal Parameters 1053-1062Based On Forced Vibrations

U.Fullekrug

Error Location And Updating Of Analytical Dynamic Models Using A Force Balance Method 1063-1070E. Fissette, C. Stavr in idis, S. Ibrahim

Improvement Of Stat ica l ly Reduced Finite Element Models For Dynamic Substructure 1071-1076Synthesis

M. Link, J . Moreno-Barragan

Finite Element Implementation Of Full Fluid/Structure Interaction Using Modal Methods 1077-1081N. R. Beagley, J . M. 0'Keeffe, C. W. Perrin

SESSION 33. STRUCTURAL DYNAMICS MODIFICATION IV

Calculation Of Modal Parameter Sensi t iv i t ies Based On A Finite Element Proportionality 1082-1087Assumption

J . Leuridan, H. Zeichska, 0. Storrer, U. Vandeurzen

Component Mode Synthesis Using Experimental Modes Enhanced By Mass Loading 1088-1093K. W. Gwinn, J . P. Lauffer, A. K. Mi l ler

Rib Stiffeners For Use In Structural Dynamics Modification 1094-1099E. J . Williams, M. M. Tayeb

Why Be Modal: i . e . How To Avoid The Use Of Modes In the Modification Of Vibrating 1100-1106Systems

A. Sest ier i , W. D'Ambrogio

The Optimal Structural Modification Principle For The Maximum Shifts Of 1107-1111Natural Vibration Frequencies

Z. Lu, Z. Feng

A New Kind Of Wide-Band Damper And I ts Application 1112-1118

B. Liao, J. Xia

SESSION 34. SUBSTRUCTURING II

Dynamic Substructure Separation Using Physical And Modal Models 1119-1123S. D. Gray, J. M. Starkey

Mode Synthesis Of A Rotationally Periodic Structure 1124-1128J. Zhang, W-L. Wang, X-J. Chen

Integrity Testing And Estimating Bearing Capacity Of Piles, Using Mechanical 1129-1132Impedance Method

Z. Jiang, J. Ma

Free-Interface Complex Mode Synthesis Methods In State-Vector Space 1133-1136K. Zhou, X-G. Chen

Fixed-Interface Substructural Modal Perturbation Method 1137-1144X. L. Huang, T. C. Huang

Computation Of Dynamic Characteristics Of Boiler Wall In Large Power Plant—An 1145-1148Application Of Dynamic Substructure Synthesis Combined With Weighted Residual Method

W. Sun, J-M. Zhu

Modal Synthesis Acceleration Method (MSAM) For Dynamic Response Calculation Of The 1149-1153Structure System

W-J. Yun, X-S. Tang

SESSION 35. MODAL TEST METHODS III

A Method For The Unbiased Estimate Of System FRFs In The Presence Of Multiple Correlated 1154-1160Inputs

R. E. Cobb, L. D. Mitchell

A New Generation Modal Data System Utilizing Distributed Processing 1161-1171R. K. Watanabe, A. C. Campbell, J. W. Moore

Vibration Considerations Concerning Vehicular Seating Systems 1172-1175D. E. Foley, R. J. Allemang

Rank Decomposition Methods In Modal Analysis 1176-1179Z. Liang, D. J. Inman

Modal Analysis Of Flexible Structure Used For Flood Control 1180-1185A. D. Alwan

Multiple Reference Modal Analysis Method Based On Physical Parameter Identification 1186-1190J. Tian, S-L. Huang, H. Suzuki, T. Ono

SESSION 36. NOISE/ACOUSTICS II

Aircraft Interior Noise Prediction Using A Structural-Acoustic Analogy In NASTRAN 1191-1198Modal Synthesis

F. W. Grosveld, B. M. Sullivan, F. Marulo

Estimation Of Distributed Acoustic Loads 1199-1206K. B. Elliott, J. Robinson

Principal Component Analysis For Noise Source Identification 1207-1214D. Otte, P. Sas, P. Van de Ponseele

Optimal Parameters of the Damper Excited by the Gaussian White Noise 1215-1218G-S. Cheng, Z. Yong

New Research To The Characteristics Of Propagation And Radiation Of Box Noise 1219-1224Z-J. Zhang, Y-Z. Shi, X-X. Han, G-S. Feng

Methods Of Fan Noise Estimation And Ways Of Control 1225-1229

G. Guan

SESSION 37. MACHINERY DIAGNOSTICS II

Knowledge Based Systems For Machinery Fault Diagnosis 1230-1237A. E. El Sayed

Detection Of Bearing Failures By Means Of Vibration 1238-1242Z. Reif, M. S. Lai, C. Silvaggi

Use Of ANC In Machinery Fault Diagnosis By Acoustic Signal 1243-1246X. Yu

Dynamic Trouble Diagnostic Of N25D Roll Type Briquetting Machine 1247-1252Q. Sun, H. Yao

Detection Of Sudden Changes Of Modal Parameters In Machinery 1253-1259M. R. Kujath

SESSION 38. EXPERIMENTAL CASE HISTORIES II

An Investigation Of Air Baffle Failures And Vibration Characteristics Of 1260-1264Motor-Generators At The Bath County Pumped Storage Station Part I. A Case Study

K. K. Dwivedy, A. W. Wallmeyer, S. J. Bragg

An Investigation Of Air Baffle Failures And Vibration Characteristics Of 1265-1269Motor/Generators At The Bath County Pumped Storage Station Part II. Testing

J. R. Hall, P. D. Harizi

Trouble Shooting Using Modal Testing - The Case of the Cracked Centrifuge 1270-1276C. B. Southgate, H. Tur

Wet-End Modal Analysis Can Reduce Basis Weight Variations On A Pulp And Paper Machine 1277-1282M. Thomas

Structural Parameter Identification Of Machine Tool Spindle Supports By Complex 1283-1287Condensation Method

Z. Wen, S. Dai, J. Yuan

SESSION 39. ANALYTICAL METHODS V

Non-Classical Flow-Induced Responses Of A L i f t ing Surface Due To Localized Disturbances 1288-1299T. Kim, R. 0. Stearman, E. J . Powers, Jr .

PAREDYM - A Parameter Refinement Computer Code For Structural Dynamic Models 1300-1304I . U. Ojalvo, T. Ting, D. Pilon

Application Of Digital F i l ters For Modal Parameter Quality Assessment From Time 1305-1311Domain Data

G-M. Lee, M. W. Trethewey

The Methods Of Determination Of The Matrix Of Direction Cosines For Three-Dimensional 1312-1320Structures And Robotic Manipulator

M. Subbiah, A. M. Sharan

Calculating Response Spectral Moments Via Complex Modal Analysis 1321-1325T. Fang

Convergence Properties Of Iterative Parameter Estimation Algorithms 1326-1331

R. Turunen

SESSION 40. STRUCTURAL DYNAMICS MODIFICATION V

Structural Design Modifications Using Modal Testing 1332-1337A. S. Vlahinos

Development Of Structural Modification Method In Consideration Of Non-Linear Elements 1338-1342N. Okubo, T. Mochizuki

Cracked Beam Modification Element - Part I : Theoretical Development 1343-1348B. S. Haisty, R. E. Duerr, W. T. Springer,

Cracked Beam Modification Element - Part I I : Application 1349-1354B. S. Haisty, R. E. Duerr, W. T. Springer

Feasibi l i ty Study Of Modifying The System Characteristics By Reanalysis Technique 1355-1358E. K. L. Yee, Y. G. Tsuei

Applications Of Modal Analysis And Structural Dynamics Modification Techniques To 1359-1364The Investigation And Design Of Chinese Ancient Bell

Z-F. Fu, Q-Z. Shi, Q-D. Pu

SESSION 41. MODAL TEST METHODS IV

A Comparison Between Single Point Excitation And Base Excitation For Spacecraft 1365-1370Modal Survey

Y. Murakoshi, F. Kuwao

Non-Toxic Stingers 1371-1379G. M. Hieber

Resolution Of Numerical Control Machine Tool Modification Problems Using A Symbiosis 1380-1383Of Machinery Diagnostics, Modal Analysis, Structural Dynamics Modification And AcousticIntensity Analysis

B. W. \lan Hoy, W. D. Strunk, T. L. Morton, R. M. Tuft

The Evaluation Of Accelerometer Mount Transmissibi l i ty For U. S. Navy Applications 1384-1389W. D. Strunk

Dynamic Considerations In The Development Of Centrifugal Separators Used For 1390-1396Reprocessing Nuclear Fuel

W. D. Strunk, S. P. Singh, R. M. Tuft

Modal Excitation - A Comparison Of Three Different Methods 1397-1402E. L. Peterson

SESSION 42. EXPERIMENTAL TECHNIQUES II

Time Variant Spectral Analysis Applications Using The Maximum Entropy Method 1403-1406H. Void, J. Crowley

Experimental Investigation For Dynamic Characteristics On Pneumatic Model Of Loader 1407-1413Mechanism

F. R. Gomaa, A. Shawky, A. El Khatib

Flaw Identification From Forced Vibration Testing 1414-1419J. D. Rogers, J. R. Hollingshead

An Adaptive Filtering Technique For Removing Periodic Noise From Modal Response Data 1420-1426M. D. Tucker

Experimental Techniques For Modelling Non-Linear Stiffness And Damping Characteristics 1427-1432R. Stanway, J. E. Mottershead

SESSION 43. NONLINEAR STRUCTURES I

Application Of The NARMAX Method To Nonlinear Frequency Response Estimation 1433-1438S. A. Billings, K. M. Tsang, G. R. Tomlinson

A Global Approach To The Detection Of Structural Non-Linearity 1439-1445G. R. Tomlinson, I. Ahmed

Wigner-Ville Distribution And Pattern/Identification For Non-Linear Systems 1446-1452P. G. Adamopoulos, J. K. Hammond

Nonlinear System Identification And Modelling With Application To An Isolator 1453-1459With Hysteresis

H. R. Lo, J. K. Hammond, M. G. Sainsbury

A Computational Method For Structural Dynamic Problems With Localized Strong 1460-1465Nonlinearities

T-G. Zhu, R-Q. Zhang, Q. Xie

SESSION 44. NONLINEAR STRUCTURES II

The Envelope Of The Response Of A Nonlinear System And Its Relationship To Upper 1466-1470Bounds On The Response Of The Equivalent Linear System

P. Davies, J. K. Hammond

Developments In Force State Mapping For Nonlinear Systems 1471-1479K. Worden, G. R. Tomlinson

Response Analysis Of Nonlinear Systems Using Functional-Perturbational Type Approach 1480-1488R. A. Ibrahim

Experimental Identification Of Nonlinear Structural Models 1489-1496N. F. Hunter, T. L. Paez

Modal Synthesis Of Machine Tool Structure Via Eigenvalue Modification Method 1497-1500D. Yu, J. Song, Z. Peng

The Effects Of The Internal Resonance W^Wg On The Response Of The Structures 1501-1504Twisting Coupling In Two Directions

J-Z. Zhang

An Effective Method For Extracting Nonlinear Frequency Spectrum 1505-1508Z-F. Zhang, S-H. Chen

SESSION 45. STRUCTURAL DYNAMICS MODIFICATION VI

An Effective Approach To Determine Natural Frequencies And Mode Shapes Of Constrained 1509-1512Beams Using Lagrange Multipliers

Z. Zeng, T. Huang, J. F. Hamilton

Vibration Analysis Of A Dew Line Station 1513-1518F. D. Haynes, W. Tobiasson, J. S. Morse

XIV

Free Vibration Analysis Of Continuous Timoshenko Beams With Stepped Cross Sections 1519-1524T. C. Huang, Y-S. He

Structural Dynamic Optimal Design Using Modal Model 1525-1529J. Zhang, K. Chen, Z. Xu

Correction Of Structural Dynamic Model Using The Results Of Complex Modal Parameter 1530-1536Ident i f icat ion

Q. Xu, G. Ma

Correction of Model/Guide For Re-Creating Mechanical Model/Diagnosis Of Structural 1537-1542Breakdown

D-W. Zhang

SESSION 46. EXPERIMENTAL CASE HISTORIES III

Time Domain Moving Analysis (TDMA) Operational Deflection Shapes (ODS) Computed 1543-1548From Time Histories

W. Kreder

Modal Test Instrumentation On A 119 M-Long Jetty: Case History 1549-1556C. A. Soto A., E. J. Laya A.

Vibration Of Thermo Windows 1557-1561J. J. Pedersen

Propeller Induced Vibrations In The Afterbody Of Fast Patrol Boats (A Case Study) 1562-1568R. Reed Morkus, A. El Ashram, A. El Khatib

SESSION 47. SYSTEM IDENTIFICATION AND CONTROL

A Brief Review On The Identification Of Nonlinear Mechanical Systems 1569-1574H. G. Natke, W. Gawronski, J-N. Juang

Some Experiences With The Eigensystem Realization Algorithm 1575-1581R. S. Pappa, J-N. Juang

Force Prediction Using Singular-Value Decomposition 1582-1588K. B. Elliott, J-N. Juang, J. Robinson

Comparison Of Some Time Domain System Identification Techniques Using Approximate 1589-1595Data Correlations

J. E. Cooper

System Identification In The Microcomputer Environment 1596-1601E. Garcia, D. J. Inman, G. C. Horner

SESSION 48. DAMPING

A Comparison of Exact And Approximate Methods Of Analysis For Added Viscoelastic 1602-1608Damping Treatments

K. K. Stevens, M. E. Martinez, W. J. Kelly

Eigenfunction Normalization, Presentation And Interpretation For Nonproportionally 1609-1615Damped Continuous Beams

G. Prater, Jr., R. Singh

Influence Of Partial Viscoelastic Damping Treatments On The Modal Parameters Of 1616-1622Circular Plates

K. K. Stevens, S. Shomstein

Modes And Solutions Of Large Damped Nonlinear Systems 1623-1627C-J. Chen, J. Tang

Hybrid Methods For The Determination Of Modal Damping Ratios 1628-1634C-Y. Liou, C-C. Shen

SESSION 49. ANALYTICAL METHODS VI

Eigenvalue And Eigenvector Derivatives For General Structural Systems 1635-1642W. L. Wolf

Forced Response Of A Rotating Thin Annular Plate To A Moving Concentrated Transverse 1643-1647Load

G. N. Weisensel, A. L. Schlack, Jr.

A Global Frequency Domain Rational Fraction Orthogonal Polynomial Curve Fit 1648-1654Y. S. Wei, R. G. Smiley, R. C. Sohaney

Force Identification From Nonlinear Structure Response 1655-1661T. J. Kreitinger, M. L. Wang

Probabilistic Distribution Of Multiple Cracks In Structures Due To Random Modal 1662-1668Oscillations

F. D. Ju, Y-M. Lu

Investigation Into The Vibration Behaviour Of A Rotor-Bearing System With 1669-1674Non-Linearized Hydrodynamic Bearing Forces

Y-B. Xie, J-Q. Ren, H-A. Zhu

SESSION 50. EXPERIMENTAL TECHNIQUES III

Measurement Of Structural Power Flow In Vibrating Systems 1675-1681R. F. Keltie, C. K. Allred

Jitter Performance Test For The Hubble Space Telescope: Method And Results 1682-1690M. A. Blair, N. Vadlamudi

Identification Of Dynamic Parameters Of Joint In Machine Tools 1691-1696X-G. Zhu, Z-L. Zhang, L. Lai

Impact Vibration Measurement Technique And Its Application 1697-1701G. Li, P. P. Wang, Z. Guo, X-J. Tang

Handling Of Vibration And Noise Reduction For Underwater Damping Plate By E.S.P.I. 1702-1705Modal Test Method

D-M. He, M-S. He

Comparison Of Stepped-Sine And Broad Band Exci tat ion To An A i r c r a f t Modal Test 1706-1713F. Lembregts, J , Lipkens, J . Leuridan, H. Van Der Auweraer

ADDENDUM TO TABLE OF CONTENTS

SOAR - A General Purpose Program For Structural Dynamic Optimization And Reanalysis 1714-1720B. P. Wang, K. L. Lawrence, T. Y. Chen, F. T. Ko, J . Leninger

Design Of Spacecraft Ver i f ied By Test In A Modular Form 1721-1729

XVi