TY  - CHAP
A1  - Borggrafe, Andreas
A1  - Ohndorf, Andreas
A1  - Dachwald, Bernd
A1  - Seboldt, Wolfgang
T1  - Analysis of interplanetary solar sail trajectories with attitude dynamics
T2  - Dynamics and Control of Space Systems 2012
N2  - We present a new approach to the problem of optimal control of solar sails for low-thrust trajectory optimization. The objective was to find the required control torque magnitudes in order to steer a solar sail in interplanetary space. A new steering strategy, controlling the solar sail with generic torques applied about the spacecraft body axes, is integrated into the existing low-thrust trajectory optimization software InTrance. This software combines artificial neural networks and evolutionary algorithms to find steering strategies close to the global optimum without an initial guess. Furthermore, we implement a three rotational degree-of-freedom rigid-body attitude dynamics model to represent the solar sail in space. Two interplanetary transfers to Mars and Neptune are chosen to represent typical future solar sail mission scenarios. The results found with the new steering strategy are compared to the existing reference trajectories without attitude dynamics. The resulting control torques required to accomplish the missions are investigated, as they pose the primary requirements to a real on-board attitude control system.
Y1  - 2012
SN  - 978-0-87703-587-9
SP  - 1553
EP  - 1569
PB  - Univelt Inc
CY  - San Diego
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
A1  - Ulamec, Stephan
A1  - Kowalski, Julia
A1  - Boxberg, Marc S.
A1  - Baader, Fabian
A1  - Biele, Jens
A1  - Kömle, Norbert
ED  - Badescu, Viorel
ED  - Zacny, Kris
ED  - Bar-Cohen, Yoseph
T1  - Ice melting probes
T2  - Handbook of Space Resources
N2  - The exploration of icy environments in the solar system, such as the poles of Mars and the icy moons (a.k.a. ocean worlds), is a key aspect for understanding their astrobiological potential as well as for extraterrestrial resource inspection. On these worlds, ice melting probes are considered to be well suited for the robotic clean execution of such missions. In this chapter, we describe ice melting probes and their applications, the physics of ice melting and how the melting behavior can be modeled and simulated numerically, the challenges for ice melting, and the required key technologies to deal with those challenges. We also give an overview of existing ice melting probes and report some results and lessons learned from laboratory and field tests.
KW  - Ice melting probe
KW  - Ice penetration
KW  - Icy moons
KW  - Ocean worlds
KW  - Mars
Y1  - 2023
SN  - 978-3-030-97912-6 (Print)
SN  - 978-3-030-97913-3 (Online)
U6  - https://doi.org/10.1007/978-3-030-97913-3_29
SP  - 955
EP  - 996
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Goh, Kheng Lim
A1  - Topçu, Murat
A1  - Madabhushi, Gopal S. P.
A1  - Staat, Manfred
ED  - Maia, Fatima Raquel Azevedo
ED  - Miguel Oliveira, J.
ED  - Reis, Rui L.
T1  - Collagen fibril reinforcement in connective tissue extracellular matrices
T2  - Handbook of the extracellular matrix
N2  - The connective tissues such as tendons contain an extracellular matrix (ECM) comprising collagen fibrils scattered within the ground substance. These fibrils are instrumental in lending mechanical stability to tissues. Unfortunately, our understanding of how collagen fibrils reinforce the ECM remains limited, with no direct experimental evidence substantiating current theories. Earlier theoretical studies on collagen fibril reinforcement in the ECM have relied predominantly on the assumption of uniform cylindrical fibers, which is inadequate for modelling collagen fibrils, which possessed tapered ends. Recently, Topçu and colleagues published a paper in the International Journal of Solids and Structures, presenting a generalized shear-lag theory for the transfer of elastic stress between the matrix and fibers with tapered ends. This paper is a positive step towards comprehending the mechanics of the ECM and makes a valuable contribution to formulating a complete theory of collagen fibril reinforcement in the ECM.
KW  - Connective tissues
KW  - Extracellular matrix (ECM)
KW  - Collagen fibrils
KW  - Mechanical stability
KW  - Tapered ends
Y1  - 2023
SN  - 978-3-030-92090-6 (Print)
SN  - 978-3-030-92090-6 (Online)
U6  - https://doi.org/10.1007/978-3-030-92090-6_6-1
SP  - 1
EP  - 20
PB  - Springer Nature
CY  - Cham
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
ED  - Knopf, George K.
ED  - Otani, Yukitoshi
T1  - Light propulsion systems for spacecraft
T2  - Optical nano and micro actuator technology
Y1  - 2017
SN  - 9781315217628 (eBook)
SP  - 577
EP  - 598
PB  - CRC Press
CY  - Boca Raton
ER  -