Research into Propulsion Nozzle Steering Torque:
In designing a ship steering system, marine engineers need to know the forces transmitted from the water through the shafting. Standard rudders have been comprehensively studied and relatively simple approximations, of various levels of complexity, are available for rudder torque. Steerable propulsion nozzles are considerably more complex.
We were approached to determine a relatively simple approach for calculating the maximum reaction torque on a steering nozzle. Our first step was to look into current methods and research topics in the field. We subsequently complied information from various sources and developed a torque calculation method analogous to what our client was already doing for standard rudders. Some empirical relationships were used in the method and we recommended areas to monitor to verify the range of applicability.
Our work resulted in an additional tool that our client can now use in engineering design. It allows our client to offer an additional service to its customers.
Submarine Safety Management:
Naval submarines provide a unique challenge to safety engineers due to the
high level of inherent risk, the space constraints, and the need to avoid
engineered interlocks which could impede the boat's ability to take
aggressive or evasive action.
A major manufacturer of submarines was required to implement a significant
modification to its design at a late stage in the design process. The
modification had to be implemented without detriment to the safety of the
overall design. We provided a safety management strategy for the
modification, and managed the safety case through to the manufacturing
stage. Using both qualitative and quantitative risk analysis, we were able to
identify the hazards and evaluate their risk for inclusion in the whole boat
Consultancy support allowed the client's safety team to continue with their
work on the core design and to easily integrate the modification into their