TY - DATA
T1 - Dataset underlying the MSc thesis: Development of an instrumented mooring system for VFFS model testing: Focused on the sensor configuration and calibration procedure
PY - 2022/04/04
AU - Sjoerd van der Voort
UR - https://data.4tu.nl/articles/dataset/Dataset_underlying_the_MSc_thesis_Development_of_an_instrumented_mooring_system_for_VFFS_model_testing_Focused_on_the_sensor_configuration_and_calibration_procedure/17105345/1
DO - 10.4121/17105345.v1
KW - force sensor
KW - Floating bodies
KW - Calibration
N2 - Floating structures have developed significantly in recent
years. As land is becoming scarce, the use the water surface will contribute to
ease this scarcity. Therefore in recent years, floating structures covering
large areas have been developed, also called flexible floating structures.

In this project the focus is set on the mooring system very
flexible floating structures (VFFS). At the TU Delft, two towing tanks can be
used to investigate the mooring system of VFFS, however first a reliable
measuring system is required that is able to examine a specific part of the
mooring system. Conventional setups that measure the mooring forces consist of
large instruments, as these instruments only have a small effect on their
investigated structure (vessels). The response of VFFS is dominated by elastic
deformations and differs from conventional rigid structures. For VFFS, these
type of instruments will have a large effect on the structure motions and thus
these conventional setups cannot be used. Therefore, a new measuring system is
required to conduct small scale experiments with VFFS, and the following
objective is formulated: Develop an instrumented mooring system for VFFS at
model scale for the towing tank at the TU Delft and determine its accuracy.

A new concept is developed in this project. This concept
resulted from an extensive concept development where all functions of the
system were analyzed. With the use of a Morphological Chart and a Multi
Criteria Analysis the best concept was selected. For this concept, it was
determined that the focus should be on the sensor configuration and calibration
procedure.

First, the optimal sensor configuration of the concept was
specified by analysing the working principle of the concept. Second, the
calibration procedure was further analyzed. From this analysis, three
calibration procedures were developed: the single sensor calibration matrix,
the full fixed calibration matrix and the full rotated calibration matrix. From
literature and theory, it was not possible to determine in advance what
calibration procedure should be selected, and therefore the performance of the
procedures were verified with experiments. All calibration procedures were
executed, whereafter the performance of the different procedures were compared.
The two main considerations for the comparison were the accuracy and the
usability of the procedures. After performing the comparison, the main
conclusion was that the full upright calibration procedure is the optimal
procedure.

To verify the concept under realistic conditions, an example
application was performed in the towing tank No.1 at the TU Delft. By doing
this, the concept has proven to be suitable to measure the mooring force and
transform them into usable data.

In this project a new concept was developed into a working
system. This system forms an excellent base for extensive research into the
mooring system of VFFS, and is a good addition to the measurement instruments
for the towing tank at the TU Delft. It is concluded that the system is able to
measure the mooring forces and the direction. The accuracy of the system still
has to be improved, and with additional research the working concept can be
further developed.
ER -