Solar electric propulsion orbital debris ferry, vehicle concept and reference mission

Duchek, Matthew E.; Abrams, John; Infeld, Samantha I.; Jolly, Steve; Drews, Michael E.; Hopkins, Jesse B.

doi:10.1016/j.actaastro.2015.06.019

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…Compare this to the LATP sample in Fig. 15 and significant gaps can be seen between individual tape layers in bond regions (7) and ( 5) which are denoted by the large dark regions in the X-ray images. This is due to the inconsistent width in the CF/PEEK tape used here which restricts the accuracy by which the tape layer can be applied creating an inhomogeneous structure within the laminate.…”

Section: Cryogenic Cycling and X-ray Ct Scanningmentioning

confidence: 69%

“…15. They are labelled from (1) to ( 7), (1) being the bottom two layers of the laminate and (7) corresponding to the bonding region between the top two layers of the laminate. A number of conclusions can be drawn from a comparison between the two sets of images.…”

Section: Cryogenic Cycling and X-ray Ct Scanningmentioning

confidence: 99%

“…Their ability to store highly permeating fuels at high pressures and under cryogenic conditions has solidified their usage in propulsion systems, breathing systems, and manoeuvring systems aboard rockets, satellites, and spacecraft [3][4][5]. Their light weight configuration, dimensional flexibility, and inherent cost savings has seen them readily incorporated into numerous missions [5][6][7] while also having significant cross over into other industry sectors such as fire fighter breathing systems and fuel tanks for aircraft and automobiles [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Rotational moulding of PEEK polymer liners with carbon fibre/PEEK over tape-placement for space cryogenic fuel tanks

et al. 2017

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PEEK polymers are investigated as replacement materials for metallic liners in composite overwrapped pressure vessels (COPVs) for fuel tank applications in space. A novel, integrally heated, rotational moulding tool has been developed to produce PEEK polymer liners, samples of which have then been overwrapped using CF/PEEK in a laser assisted tapeplacement (LATP) process to produce demonstrator samples of a polymer lined COPV.Helium permeability testing has shown that the designs are capable of resisting leakage to acceptable levels for fuel storage, while X-ray CT scanning and cryogenic cycling have shown that the current design is capable of resisting crack growth over multiple cycles. Nanoindentation testing has shown that the LATP process has created a region of reduced modulus in the PEEK polymer at the surface of the liner where the CF/PEEK has been tapelaid. This laser-affected zone of reduced polymer modulus in the composite interface region has enabled an enhanced resistance to crack growth formations from thermal residual stresses in comparison to hot plate moulded test samples.

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Section: Cryogenic Cycling and X-ray Ct Scanningmentioning

confidence: 69%

Section: Cryogenic Cycling and X-ray Ct Scanningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rotational moulding of PEEK polymer liners with carbon fibre/PEEK over tape-placement for space cryogenic fuel tanks

et al. 2017

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“…For these representative quartic polynomial surrogate models given in Eqs. (5) and (6), Table 1 summarizes the surrogate model coefficients of six SEP engines [54,43], which we adopt for the present study. The input power is in kilowatts and the mass flow rate is in milligram/s.…”

Section: Practical Engine Modelsmentioning

confidence: 99%

“…Over the past six decades, significant technological developments have been made that drastically improve, and arguably, revolutionize the capacity of space probes to accomplish missions beyond what had been possible using earlier technologies [1,2,3,4,5,6]. Specifically, the recent breakthroughs that have taken place in advanced Solar Electric Propulsion (SEP) systems [7] are noticeable in reducing launch mass and enabling inexpensive missions [8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

A novel approach for optimal trajectory design with multiple operation modes of propulsion system, part 2

et al. 2020

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Equipping a spacecraft with multiple solar-powered electric engines (of the same or different types) compounds the task of optimal trajectory design due to presence of both real-valued inputs (power input to each engine in addition to the direction of thrust vector) and discrete variables (number of active engines).Each engine can be switched on/off independently and "optimal" operating power of each engine depends on the available solar power, which depends on the distance from the Sun. Application of the Composite Smooth Control (CSC) framework to a heliocentric fuel-optimal trajectory optimization from the Earth to the comet 67P/Churyumov-Gerasimenko is demonstrated, which presents a new approach to deal with multiple-engine problems. Operation of engine clusters with 4, 6, 10 and even 20 engines of the same type can be optimized.Moreover, engine clusters with different/mixed electric engines are considered with either 2, 3 or 4 different types of engines. Remarkably, the CSC framework allows us 1) to reduce the original multi-point boundary-value problem to a two-point boundary-value problem (TPBVP), and 2) to solve the resulting TP-BVPs using a single-shooting solution scheme and with a random initialization of the missing costates. While the approach we present is a continuous neighbor of the discontinuous extremals, we show that the discontinuous necessary conditions are satisfied in the asymptotic limit. We believe this is the first indirect method to accommodate a multi-mode control of this level of complexity with realistic engine performance curves. The results are interesting and promising for dealing with a large family of such challenging multi-mode optimal control problems.

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Performance and plume evolutions during the lifetime test of a Hall-effect thruster

Cao

Wang²,

Ren

et al. 2020

Acta Astronautica

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Solar electric propulsion orbital debris ferry, vehicle concept and reference mission

Cited by 6 publications

References 5 publications

Rotational moulding of PEEK polymer liners with carbon fibre/PEEK over tape-placement for space cryogenic fuel tanks

Rotational moulding of PEEK polymer liners with carbon fibre/PEEK over tape-placement for space cryogenic fuel tanks

A novel approach for optimal trajectory design with multiple operation modes of propulsion system, part 2

Performance and plume evolutions during the lifetime test of a Hall-effect thruster

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