Research and technology

A collection of technical papers published at conferences or in journals by our employees

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.

The Lloyd's Register Technology Day has been established to provide an introduction to technologies that we are considering and developing in support of our mission to promote safety and environmental protection in the marine industry.

The papers presented at the seminar's embrace subjects ranging from statutory and risk issues, through propulsion and control, to structural, metallurgical and environmental topics.

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.

The papers are freely available for download. Please contact cheryl.petty@lr.org for more information.