51 research outputs found
ZERO-G EXPERIMENTS OF THE BIONICWINGSAT - A 2U-CUBESAT WITH DEPLOYABLE, BIOLOGICALLY-INSPIRED WINGS
In this paper, recent testing of a novel deployable
structure with several potential applications in space
will be described, with the focus on performed
deployment experiments in a DLR Zero-g flight
campaign and in ground tests. Through a
cooperative effort of the German Aerospace Center
(DLR) and the National Aeronautics and Space
Administration (NASA), a biologically-inspired
structurally-integrated membrane featuring
distributed functional elements has been developed
and integrated into the 2U CubeSat called
BionicWingSat. Such a membrane structure could
be useful for all sorts of applications in which a
relatively flat area is desirable such as solar sails,
drag sails, or solar shades. For SmallSats and
CubeSats, the design proposed also has the
desirable property of being self-deploying without
the need for powered deployment mechanisms.
Building on previous work inspired by the wings of
earwigs, the research presented in this paper
focuses on testing of developed design concepts for
such structural systems. To do so 24 fully integrated
wings on two BionicWingSats in 2U Cubesat format
were experimentally deployed in a microgravity
environment during a dedicated DLR Zero-g flight
campaign in 2021. The results of these
experiments, the built hardware and test articles,
the test arrangement, as well as a comparison to
ground tests are discussed in this paper
Design and Testing of the BionicWingSat in a Zero-g Flight Campaign - A 2U-CubeSat with Deployable, BiologicallyInspired Wings
In this paper, recent developments in the design, manufacturing, and testing of a novel
deployable structure with several potential applications in space will be described. Through a
cooperative effort of the German Aerospace Center (DLR) and the National Aeronautics and
Space Administration (NASA), a biologically inspired structurally integrated membrane featuring
distributed functional elements has been developed and tested in a 2U CubeSat called
BionicWingSat. Such a membrane structure could be useful for several applications in which a
relatively flat area is desirable such as solar sails, drag sails, or solar shades. For SmallSats and
CubeSats, the design proposed also has the desirable property of being self-deploying without the
need for powered deployment mechanisms. Building on previous work inspired by the wings of
earwigs, the research presented in this paper includes structural design of self-deploying hinges, a
survey of various advanced additive layer manufacturing (ALM) methods for making hinges,
mechanical characterization of the hinges, and finite element analysis (FEA) of the hinges. In this
work, the conflicting goals of maximizing deployed structural stiffness, maximizing deployed area,
maximizing stowed packaging efficiency, and maximizing resistance to creep when stowed must be
considered. The resulting design concept is a gossamer structure that cannot support its own
weight in gravity. For this reason, a focus in this paper is on a parabolic flight test campaign in
which 24 fully integrated wings on two BionicWingSats were tested in a microgravity environment.
From this test campaign, several lessons were learned regarding the wing design and procedures
for carrying out microgravity tests of this manner
Questions of fairness and anti-doping in US cycling: The contrasting experiences of professionals and amateurs
The focus of researchers, media and policy on doping in cycling is often limited to the professional level of the sport. However, anti-doping test results since 2001 demonstrate that banned substances are also used by US cyclists at lower levels of the sport, necessitating a broader view of the patterns and motivations of substance use within the sport. In this article, we describe and explain the doping culture that has emerged in domestic US cycling among amateur and semi-professionals. Through analysis of records from sports governing bodies and journalistic reports, we assess the range of violation types and discuss the detection and punishing of riders who were not proven to have intended to cheat but became "collateral damage" in the war on doping. We argue that the phenomenon of doping is more complex than what has been shown to occur in elite sport, as it includes a wider variety of behaviours, situations and motivations. We develop fresh insights by examining cases where doping has been accidental, intrinsically motivated, non-performance enhancing or the result of prescribed medical treatments banned by anti-doping authorities. Such trends call into question the fairness of anti-doping measures, and we discuss the possibility of developing localised solutions to testing and sanctioning amateur athletes
Pareto-Optimal Cost Division for the Design of Sewage Water Treatment Plants by means of the DSS REH
Heuristic solving of NP-complete job-shop scheduling problems by multicriteria optimisation
In this paper a decision support system (DSS) for job-shop scheduling is presented. Within the DSS evolutionary programming techniques have been applied to solve job-shop scheduling problems. The decision support system is illustrated with a numerical example and computational results are reporte
Moderne Diesel-Einspritztechnik
Paper presented at TU Muenchen, February 16, 1984Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
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