Determining the Optimal Route for a Tethered Manure Applying Robot

Lely is developing a tethered manure applicator robot, designed to work on the fields of farms. This vehicle called the Jojo, is constrained in its movement due to the attached tether. It can not make tight turns and can only reverse by backtracking the driven path. This thesis explores the path planning issue and provides a novel solution. The...

Six-degrees-of-freedom simulation model for future multi-megawatt airborne wind energy systems

Currently developed airborne wind energy systems have reached sizes of up to several hundred kilowatts. This paper presents the high-level design and a six-degrees-of-freedom model of a future fixed-wing airborne wind energy system operated in pumping cycles. This framework is intended to be used as an open-source reference system. The fixed...

Electrodynamic Tethers For Deep Space Missions: A Feasibility Study

With current technology, it has been found that the feasibility of long-term adaptable exploration missions at the far reaches of the Solar System and beyond is limited, due to shortcomings in conventional propulsion systems. Electrodynamic tether (EDT) propulsion methods may provide a viable alternative, utilising either the interplanetary...

Stable Spinning Deployment Control of a Triangle Tethered Formation System

The tethered formation system has been widely studied due to its extensive use in aerospace engineering, such as Earth observation, orbital location, and deep space exploration. The deployment of such a multitethered system is a problem because of the oscillations and complex formation maintenance caused by the space tether's elasticity and...

Electricity in the Air: Insights From Two Decades of Advanced Control Research and Experimental Flight Testing of Airborne Wind Energy Systems

Airborne wind energy systems convert wind energy into electricity using tethered flying devices, typically flexible kites or aircraft. Replacing the tower and foundation of conventional wind turbines can substantially reduce the material use and, consequently, the cost of energy, while providing access to wind at higher altitudes. Because the...

Towing test data set of the kyushu university kite system

Kites can be used to harvest wind energy with substantially lower material and environmental footprints and a higher capacity factor than conventional wind turbines. In this paper, we present measurement data from seven individual tow tests with the kite system developed by Kyushu University. This system was designed for 7 kW traction power...

Reliability analysis of Submerged Floating Tunnels

A submerged floating tunnel (SFT) can be a promising solution for crossing a deep or wide waterway. This tunnel concept will consist of an immersed tube, either attached with anchor cables to the seabed or attached to pontoons floating on the water surface. The reliability of the tether-stabilized SFT is assessed in this research. A suitable...

Power Prediction of Airborne Wind Energy Systems Using Multivariate Machine Learning

Kites can be used to harvest wind energy at higher altitudes while using only a fraction of the material required for conventional wind turbines. In this work, we present the kite system of Kyushu University and demonstrate how experimental data can be used to train machine learning regression models. The system is designed for 7 kW traction...

The Submerged Floating Tunnel: An experimental study on the hydrodynamics and kinematics of a submerged rectangular cylinder in a wave-current environment

This study presents the results of small scale flume experiments on a submerged rectangular cylinder subjected to a current, regular wave and combined wave-current environment. The objective of the study is to gain more knowledge about the hydrodynamics around and the kinematics of a submerged structure, to give a contribute to the research...

Methodology Improvement for Performance Assessment of Pumping Kite Power Wing

Pumping kite power systems are a promising way of harnessing clean energy from high-altitude winds. A large kite flies crosswind developing a strong pulling force through a tether which is connected at the ground to an electrical generator. The power output of such innovative systems is directly related to the wing aerodynamic properties which...

Tether Dynamics Analysis and Guidance & Control Design for Active Space Debris Removal

Recent years have seen a steep increase in research being performed towards active space debris removal: space debris has proven to be a very real threat to operational spacecraft, and studies indicate that the frequency of collisions will only increase if nothing is done to remove large pieces of debris. In particular, ESA has done studies...

Electrodynamic Tether Experiment onboard the Delfi-1 Satellite

Space debris is becoming an increasing problem requiring a low cost propulsion system capable of disposing non operable satellites and spent rocket stages. To this end electrodynamic tethers have been proposed as a viable alternative to conventional propulsion. Aside from a de-orbit system electrodynamic tethers have a wide range of applications...

Tethers in Space: A propellantless propulsion in-orbit demonstration

Space tethers are cables that connect satellites or other endmasses in orbit. The emptiness of space and the near-weightlessness there make it possible to deploy very long and thin tethers. By exploiting basic principles of physics, tethers can provide propellantless propulsion and enable unique applications such as the provision of comfortable...

Tethered particle motion mediated by scattering from gold nanoparticles and darkfield microscopy

A new optical method for characterizing single molecule interactions based on dark field microscopy

Single-molecule techniques continue to gain in popularity in research disciplines such as the study of intermolecular interactions. These techniques provide information that otherwise would be lost by using bulk measurements that deal with a large number of molecules. We describe in this report the motion of tethered DNA molecules that have been...

Golfvoortplanting in slagaderen

Please note that only this summary is in english. The rest of the report is in dutch only. This paper deals with the wave propagation of harmonic travelling waves through an incompressible, Newtonian fluid contained within an elastic tube with homogeneous and isotropic wall material. In particular the next questions are considered: 1) What is...