

REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No. 07044)18 





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1. AGENCY USE ONLY (Leave blank) 



2. REPORT DATE 



January 1995 



3. REPORT TYPE AND DATES COVERED 



Final; Oct 1991 through Sep 1994 j 





4. TITLE AND SUBTITLE 



SEAWATER HYDRAULIC ROCK DRILL IMPACT 

 MECHANISM MODEL VALIDATION 



5. FUNDING NUMBERS 



PR - RM33F61 

 WU - DN662005 





6. AUTHOR(S) 



John P. Kunsemiller and Brace W. Farber 





7. PERFORMING ORGANIZATION NAME(S) AND ADDRESSE(S) 



Naval Facilities Engineering Service Center 



560 Center Drive 



Port Hueneme, CA 93043-4328 



8. PERFORMING ORGANIZATION REPORT 

 NUMBER 



TR-2037-OCN 



3- 



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3. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESSES 



Office of Naval Research 

 800 Quincy Street 

 Arlington, VA 22217-5000 



10. SPONSORING/MONITORING AGENCY REPORT 

 NUMBER 



11. SUPPLEMENTARY NOTES 



12a. DISTRIBUTION/ AVAIL ABILITY STATEMENT 



Approved for public release; distribution unlimited. 



12b. DISTRIBUTION CODE j 



I 



13. ABSTRACT (Max/mum 200 words) 







Ihe Naval facilities Engineering service ^enier irNrr-av^; nas aeveiopea ana evaiuaieu a compuier 

 model of the single poppet-kicker port linear impact mechanism used in the seawater hydraulic rock drill. j 

 The project objective was to identify hydraulic and dynamic elements influencing impact mechanism opera- 

 tion. A goal of this investigation was to determine whether or not computer modeling of the impact 

 mechanism for the seawater hydraulic rock drill would lead to an improved linear impact mechanism 

 suitable for a hand-held, diver-operated rock drill. Having achieved qualitative model response, the model 

 served as an analysis tool for evaluating proposed changes toward achieving a minimum 7 foot-pound blow 

 energy. Model parametric studies lead to validation of predicted performance improvements through hard- 

 ware tests using the pre-production seawater rock drill with modified impact mechanism component parts. j 

 This document is the final report on a 3 -year effort that has resulted in a better understanding of the | 

 hydraulic and dynamic elements influencing impact mechanism operation as well as a technique for analyz- 

 ing complex fluid power components. At the conclusion of funding, the validated model showed a reliable 6 

 foot-pound blow energy. Additional development of the single poppet-kicker port linear impact mechanism 

 is recommended using the validated model as a basis for optimizing the linear impact mechanism. 





14. SUBJECT TERMS 



Seawater, rock drill, tools, diver equipment, hydraulic equipment 



15. NUMBER OF PAGES 1 



45 | 





16. PRICE CODE 





17. SECURITY CLASSIFICATION 

 OF REPORT 



Unclassified 



18. SECURITY CLASSIFICATION 

 OF THIS PAGE 



Unclassified 



19. SECURITY CLASSIFICATION 

 OF ABSTRACT 



Unclassified 



UL 



NSN 7540-01-280-5500 



Standard Form 298 (Rev. 2-89) 

 Prescribed by ANSI Std. 239-18 



