Accession Number : ADA291869

Title :   Seawater Hydraulic Rock Drill Impact Mechanism Model Validation.

Descriptive Note : Final rept. Oct 91-Sep 94,

Corporate Author : NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA

Personal Author(s) : Kunsemiller, John P. ; Farber, Bruce W.

PDF Url : ADA291869

Report Date : JAN 1995

Pagination or Media Count : 44

Abstract : The Naval Facilities Engineering Service Center (NFESC) has developed and evaluated a computer model of the single poppet-kicker port linear impact mechanism used in the seawater hydraulic rock drill. The project objective was to identify hydraulic and dynamic elements influencing impact mechanism operation. 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. 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 analyzing 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.

Descriptors :   *COMPUTERIZED SIMULATION, *HYDRAULIC EQUIPMENT, *DIVER EQUIPMENT, *ROCK DRILLING, PARAMETRIC ANALYSIS, PRODUCTION, IMPACT, VALIDATION, MODELS, DYNAMICS, RESPONSE, OPERATION, FLUIDS, PARTS, POWER, SEA WATER, HAND HELD, DIVERS, UNDERWATER EQUIPMENT, UNDERWATER CONSTRUCTION.

Subject Categories : Computer Programming and Software
      Hydraulic and Pneumatic Equipment
      Mining Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE