- Vll - 



TABLE OF CONTENTS (Continued) 



D. Results of DPG Data Analysis 119 



1. Introduction 119 



2. Time Domain Signal Analysis 119 



3. Record Length 124 



4. Capability of the DPG System 134 



5. Directional Spectra Smoothing 135 



6. Redundancy of DP2 and DP4 Measurements I37 



7. Energy Spectra from Differential Pressure 



Gauges 14-0 



8. Directional Estimates without the 



Absolute Pressure Gauge 144 



9. Arithmetic Development of the Curvatirre Terms . . 114.5 



CHAPTER VII: RECOMMENDATIONS 149 



CHAPTER VIII: CONCLUSIONS ........ ..... I55 



REFERENCES I60 



APPENDIX A: Sample DPG Analysis Results; June 8-11, I982. . . I63 



APPENDIX B: Typical Strip Chart Recordings from 



Bench Calibration ^ 



APPENDIX C: A Partial List of DPG Dimensions I89 



APPENDIX D: Assembly and Maintenance of the DPG 191 



APPENDIX E: The Estimation of Higher Order Directional 



Fourier Coefficients 200 



APPENDIX F: Fortran Analysis Program for DPG Data 20? 



