New tool for harmonised IACS rules aids designers

15 Feb 2014
Class NK’s new software is the first to support the latest IACS harmonised CSR requirements

Class NK’s new software is the first to support the latest IACS harmonised CSR requirements

Classification society ClassNK has release a new version of its PrimeShip-Hull ship design support software, said to be the first such product that fully supports the IACS Common Structural Rules (harmonized CSR) for oil tankers and bulk carriers.

The harmonised CSR concept was adopted by IACS in December 2013. It is designed to unify and harmonise the existing CSR requirements for tankers and bulk carriers, while incorporating new requirements for more comprehensive structural analysis at the design stage. The new rules will be applied to all bulk carriers over 90m and all oil tankers over 150m contracted on and after 1 July 2015.

The harmonised CSR contributes to improved ship safety, but presents challenges for shipyards and designers. ClassNK developed its new design support software to meet those challenges.

Class NK executive vice-president responsible for development of the new product, Dr Takuya Yoneya, said: “While the new rules will mean safer ships, shipyards and designers will have to invest new resources to meet new design criteria and bring their designs into compliance with the new rules. With PrimeShip-Hull (HCSR), our goal has been to develop a comprehensive and powerful design support tool that rationalises the design process and greatly reduces the man-hours needed to create ship designs that are compliant with the new rules.”

The new software combines rule calculation and FEM-based direct strength calculation software with new systems designed to interface directly with commercial CAD and rule calculation software, as well as automate parts of the basic design process.

“Thanks to the new interface with commercial CAD, PrimeShip-Hull (HCSR) makes it possible to automatically generate FE models for the fore, mid, and aft sections of the ship, as well as very fine mesh and buckling panel data. This makes it possible to greatly reduce the time required for some of the most man-hour intensive parts of ship design work,” said Dr. Yoneya.

The updated product includes features to help shipyards and designers to rapidly evaluate potential designs, optimising them in accordance with the harmonised CSR. Class NK says that it has worked closely with more than 70 shipyards and ship designers in Asia, who used preliminary versions of the software, released to coincide with the first and second drafts of the harmonised CSR in July 2012 and April 2013, respectively. Feedback from this testing has, says Class NK, ensured that the final product will simplify incorporation of harmonised CSR, and prove cost-effective for users as well as ensure a new generation of safer and more robust ships.

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