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April 2009
Lloyd's Register ODS publishes article about Operational Modal Analysis of large rotating machinery on the IOMAC conference 2009
Operational Modal Analysis (OMA) is increasingly used for analysing structural properties of rotating machinery. Until a few years ago, the presence of dominant harmonic components would limit the useful frequency range, but today methods exist to automatically detect and subsequently eliminate their influence.
This paper concerns OMA on large 2-pole rotating machinery. The analysis has been limited to the frequency range around 50 and 100 Hz, where unbalance and electromagnetic forces, respectively, can give high vibration amplitudes of the stator. Two methods have been used for the analysis: Curve-fitted Frequency Domain Decomposition (CFDD) and Stochastic Subspace Identification (SSI). The methods are evaluated and the results are compared with results from a Classical Modal Analysis performed on the same machinery.
March 2009
Lloyd's Register publishes article on the Value of CFD in Ship Design & Analysis
Computational Fluid Dynamics (CFD) analysis is fast becoming an essential part of design and performance assessment procedures within the marine industry. With its strategic role in evaluating and applying leading edge technologies for the benefit of its clients and the industry as a whole, Lloyd's Register has expended considerable effort in verifying and validating CFD technology, according to a recent article in CD adapco's Marine Special Report, Feb '09.
The article goes on to 'review a small selection of cases on which Lloyd's Register has worked over the past 15 years and, in the process, illustrates the rapid pace at which CFD technology has developed and demonstrates the extent to which CFD has become a practical tool for marine design and safety assessment.'
Lloyd's Register ODS to publish a feature article on Hydrodynamic Aspects of Containership Propulsion in CD adapco's March '09 Newsletter
According to this feature article, "Lloyd's Register ODS has recently been involved with the investigation of a number of vibration and noise related habitability problems aboard feeder containerships..."
In 'Challenges and Solutions - Hydrodynamic Aspects of Containership Propulsion', Anne Boorsma, Patrick Fitzsimmons, Dejan Radosavljevic and Stewart Whitworth go on to say that, "Lloyd's Register ODS is currently working on ship scale propeller caviation-characteristic predictions and, upon completion, it is expected that CFD will become the standard method for determining propeller inflows."
When looking at the challenges and solutions of hydrodynamic aspects of containership propulsion, factors such as propeller analysis and inflow prediction were explored. The artilce, in its entirety, can be found in the March '09 Newsletter by CD adapco.
If you'd like more information on these, or any other article by Lloyd's Register ODS, please contact us.
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