Ergonomic Development of Propulsion Hand Tools for Underwater Technologies: System Approach

Dmochowski, Jan (Technical U. of Poznan)

OnePetro 

Background Divers working underwater are often using hand tools with hydraulic propulsion. These tools have strong impact on divers work conditions, which are entirely different than conditions of work of the people acting in workshops. For the submerged diver acting underwater, where foam suit and life support system provide him a chance to survive and execute his task - the modified diagram of "man-machine" ergonomic system must be applied. The proposed schematic diagram of the "diver-tool" ergonomic system for underwater conditions is shown on Figure 1. The mechanized hand tool as element of this system is effected by different factors connected with the water as medium, and hydrostatic pressure. This consideration of the hand tool is mainly based on experience with the development of hydraulic drillers. The hydraulic driller as element of ergonomic system is effected by the factors:–cold water with high specific heat is acting as a cooling medium of drill; –cold water is acting as cooling medium of the diller; –water with high viscosity and density is lubricating drill movement; –diver hands and fingers which are carrying and operating the driller are effected by cold water. The operating of driller is also effected by "weightlessness" of a diver, diver stresses connected with hazardous situation, poor visibility, etc. THE TOOL DEVELOPMENT The project to develop the set of, hydraulic hand tools started few years ago. In this project teams from Technical Universities in Szczecin and Poznan were involved. The first generation of the hand tools have been worked out, where the basic mechanical criteria were considered. The driller from this set, WH-25 was built and tested. Then, in the next step the ergonomical criteria for underwater tools were' elaborated. The second generation of the tools based on this criteria was designed. One from the set - hydraulic driller WH-25E was constructed. At that time third type of the driller was constructed - the hydraulic impact driller WH-10. To test this three type of drillers and to recognize the relations between performance of the "diver-driller" system and the effecting underwater factors - the tests of the system have been proposed. P. 711^

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