Lloyd's Register Technical Papers

This is a collection of technical papers published at conferences or in journals by our employees. They have been categorised in broad marine technical disciplines for ease of reference.

Ship Technology

Some Recent Experience with Double Hull Tankers
March 2004

Lloyd's Register has accumulated a significant amount of service experience with double hull tankers. This paper summarises defect and damage data from the LR fleet. The influence of the afterbody structural design on the propulsion machinery systems; shaft alignment; propulsion; vibration and manoeuvring are also discussed.

The Development of Trimaran Rules
2004

The Trimaran design has generated intense interest around the world and is becoming a viable option for both military and commercial applications. Lloyd's Register is developing Trimaran Rules and the paper describes their content, the development process and the assumptions made.

Ship Vibration and Noise: Some topical aspects
June 2005

As ship design advances, particularly structural optimisation and higher speeds, noise and vibration problems can become more pronounced. This paper reviews hydrodynamic sources of excitation, the comfort class rules and their ISO basis and comment is made concerning noise in the shipboard environment.

Marine Engineering

Selection and Use of Standards for Naval Ships
August 2004

The use of commercial standards rather than naval standards for procurement, design and operation of naval ships is increasing, driven mainly by cost considerations. This paper highlights some of the issues involved in the selection of standards and addresses the need for a coherent policy.

Development of Requirements for Fuel Cells in the Marine Environment - Performance and Prescription
2004

This paper reviews the development of requirements for marine electrical power supplies and discusses ways of developing requirements for new designs of power systems such as fuel cells.

Metallurgy, Materials, Welding and NDE

Effect of Burr Grinding on the Fatigue Strength of Angled Welded Connections
April 2004

Fatigue strength of welded connections are generally lower than equivalent un-welded components. Lloyd's Register has undertaken experimental work to determine the effect of grinding on the fatigue life of angled connections such as hopper-knuckles and bulkhead lower and upper stools.

What next?

The papers are freely available for download. Please contact jenny.wellard@lr.org for more information.