船舶轴系英文文献

NAUTICUS MACHINERY GETS POLAR BOOST

The March 2012 release of Nauticus Machinery contains new calculation tools covering Baltic (FSICR) and Polar Ice Class Rules, among more than 250 new features that are implemented. “This is a major release with many important upgrades, including a new Propeller Blade tool and improved user interfaces and solvers,” says principal software engineer Jo ?vstaas.

With the release of Nauticus Machinery v11.0 (March 2012), there are many new significant features, including improved user interfaces and solvers for Nauticus Shaft Alignment and Nauticus Torsional Vibration, as well as support for Polar/Baltic Ice-Class in Nauticus Shaft Fatigue and Nauticus Gear Rating.

“There is still a lot of focus on shaft alignment both in the industry and in DNV, as well as new rules and regulations addressing ships operating in arctic environments. This is what we are trying to address in this release,” says ?vstaas.

“For the Nauticus Shaft Alignment tool we are preparing for possible upcoming class rules giving more strict requirements to the modelling, analysis and shipboard installation process. In this release we have done a lot of improvements in the user interface based on feedback from our customers,” says ?vstaas. The tool has become mo re

“engineering-directed” by adding property grids, scripting and new result layouts. The previous solver has been replaced with a full-blown FEA-solver, making it easier to focus more on typical stern tube bearing problems. Also added is a new approach of calculating the oil film distribution in the stern tube. Additionally, a “quick-start” guide and many model and script examples are available in the new release.

The Nauticus Torsional Vibration tool has significantly more capabilities now compared to the 2006 version. The user interface was totally redesigned in the v10.1 release in 2011, and the focus has been to provide a very user-friendly graphic modeller and result viewer. The solver is more powerful and the performance is improved significantly. The new tool is capable of handling everything from simple electric propulsion systems up to more sophisticated systems with several engines, complex gears, propeller lines and power take off (PTO).

Due to the handling of more advanced systems we have introduced scripting-capabilities in the new tool. This is a very powerful and efficient way to build up models. There are also some functions to import standardised mass elastic files from the engine manufacturer to build up

a model much more efficiently. The most important features in the current release are a new stiffness and mass calculator and support for constant torque and variable MIP load cases for generator sets.

The Nauticus Gear Rating and Shaft Fatigue tools are now supporting Polar and Northern Balt ic Ice Class (IACS UR I3, DNV’s Classification Note 51.1 and DNV Rules Pt. 5 Ch.1). Both tools are delivered with two licence options; one supporting main class requirements and a licence extension supporting ice-class. In addition some estimation features for maximum ice torque load and load cycles are added.

And finally a new Nauticus Propeller Blade tool has been added to Nauticus Machinery. It calculates the safety against damages in the propeller blade and tunnel thruster, and also takes the ice class into consideration. The new tool is based on DNV Rules and Classification Note 41.5 which covers a majority of possible propeller designs and focuses on 4 critical sections in the propeller blade.

New calculation tools

Nauticus Machinery contains the following new calculation tools: ?Nauticus Propeller Blade, based on DNV Classification Note 41.5 ?Nauticus Gear Rating “Ice,” based on DNV Classification Note 51.1?Nauticus Shaft Fatigue “Ice,” based on DNV Classification Note

51.1

The new shaft and gear tools can be considered as extension to the current tools, as they cover the new Baltic (FSICR) and Polar Ice Class Rules.

Shaft Alignment

The Nauticus Shaft Alignment calculation tool offers a rewritten solver based on the finite element method. In addition, the layout of the results is improved and the optimisation feature has been rewritten.

Shaft Fatigue and Torsional Vibration

The new Nauticus Shaft Fatigue supports DNV Classification Note 51.1 ‘Ice strengthening of propulsion machinery’ in addition to the existing Class Note 41.1 (Main class). The new tool is now capable of calculated safety factors and accumulated fatigue required by the new Polar and Baltic ice class rules.

The Nauticus Torsional Vibration tool is more powerful with significant improvement in performance. It now handles everything from simple electric propulsion systems up to more sophisticated systems with several engines, complex gears, propeller lines and power take off (PTO). We have

also introduced scripting capabilities for handling more advanced systems, providing a powerful and efficient method of building models. Functions allowing the import of standardised mass elastic files from the engine manufacturer make model-building more efficient.

Crankshaft Fatigue

Nauticus Crankshaft Fatigue calculates the safety against fatigue failure in pin and journal fillets and in oil bores, as well as safety against slippage for semi-built crankshafts. It is based on a version of DNV Classification Note 41.2 that is not official yet. The current version of the tool must not be used in production, and is solely for test purposes until the new Classification Note is approved.

Workflow Manager

Nauticus Machinery Workflow Manager, the starting point to all calculation tools in Nauticus Machinery, pr eviously contained a ‘lite’ and an ‘advanced’ configuration to be selected at installation. In the new release, the two profiles have been merged.

For more detailed information, please see the release note and download which is posted on the Nauticus Machinery download and update site.

AUTHOR: KAIA MEANS

日期: 20 April 2012