Lead Session Chair:
Stephan Barth, Managing Director, ForWind - Center for Wind Energy Research, Germany
Sigurd Hildebrandt (1) F P
(1) NavConsult AWSS, Brunsbüttel, Germany
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Presenter's biographyBiographies are supplied directly by presenters at OFFSHORE 2015 and are published here unedited
Sigurd Hildebrandt has 30 years professional experience in the shipbuilding industry. He started his career as an engineer at shipyard Blohm+Voss, Hamburg, taking over various positions including head of export. Leaving there he became Managing Director of a medium sized shipyard, where he followed projects building monopiles and converting the yard’s production capabilities to the renewable sector.
Afterwards, he worked with Voith Turbo in international sales. With his affinity to the renewables he contributes with his knowledge to interdisciplinary working groups. 2014 he started his own business, supporting companies in the offshore and maritime industry.
Safe transfer of technicians and avoidance of motion sicknes
Crew Transfer Vessels (CTVs) should be of minimum displacement in order to reduce the impact forces at the boat landings. On the other side they should be big, stable and rigid enough to offer a comfortable ride in heavy weathers. This dilemma leads to multiple design approaches, where operational performance can hardly be assessed, evaluated and compared. In order to assist the industry Motion Impact Recorder MIR Maritime has been developed by the German companies Schramm group, J&C Bachmann and NavConsult AWSS.
The new system has recently been installed first time on some ships in North and Baltic Sea, so that experiences and customer’s benefit will be presented. The hardware consists of a black-box to be mounted on board the vessel, no interfaces, no cabling, only power supply is required. It measures and records the accelerations when the CTV pushes against the boat landing of the turbine foundation for personnel transfer as well as vessel motions during transit. Back in the harbour, automatic data transfer to the company’s server starts. After detailed evaluation, the customer will receive a monthly report.
Main body of abstract
The sensor technology is based on piezo-electrical acceleration gyros, measuring ship's movements in all six degrees of freedom. The gyros are manufactured for heavy-duty industrial applications and are in service since many years. All related hardware, i.e. sensors, tablet and AC/DC converters, are housed in a single black box to be rigidly mounted. Location on board is irrelevant, only window view is needed for receiving the GPS signal. Calibration is done automatically, as gravity is always 1g. Data communication works via 3G.
An IT-structure has been established to assure that monthly reports are automatically generated.
Having the first systems in service, multiple additional features are discussed with the CTV operators, e.g. an online functionality to see real time performance of a ship via secured log-in. Also enhancements with video recording of critical situations are under development.
CTV operators will receive evidence which impact forces their ships have applied to which turbine structure, and they will get a guidance up to which sea state the vessel can sail to the wind park without endangering the well-being of the service technicians. The wind park operators will benefit as they obtain in sight-view in key performance criteria of the ships they have chartered in. Altogether, this paper will present a low-cost solution to improve health and safety of the personnel maintaining the turbines.
This paper will discuss the safety and health aspects focusing on the step-over manoeuvre of the service technicians at the boat landing and on the avoidance of motion sickness during transit. Limiting factors and evaluation parameters are shown, prevalence of motion sickness with the probability of vomiting is described, and tables are developed to help assessing the weather influence.