Route Length, Curve Radius and Layout of Evacuated Tube Maglev Space Launch System

2013 ◽  
Vol 437 ◽  
pp. 93-97
Author(s):  
Yao Ping Zhang
Keyword(s):  
Large Scale ◽  
Vertical Section ◽  
Scale Space ◽  
Tube Length ◽  
Straight Tube ◽  
Curve Tube ◽  
Space Launch ◽  
Curve Radius ◽  
Evacuated Tube ◽  
Tube Segment

Current space launch is expensive and low-efficient because the invalid load----rocket and fuel in it occupies over 80% of the total launch weight. A solution to reduce the space launch cost and increase the launch efficiency is to construct the evacuated tube, pump air out from the tube and have the maglev vehicle loaded with the spacecraft run in it; the spacecraft fly out the tube when the maglev is accelerated to ultra-speed, e.g. 5km/s even 8km/s in the tube. By this way, the first class of the rocket could be saved, so that the launch cost would be low and lead the large scale space exploitation to become reality in the soon future. As for the tube construction, the route layout should be concerned on at first. Because of the engineering restriction, the height at the tube end wouldnt be very high, and the embedding depth wouldnt be very deep, practically about 8km. However, the tube length will be 700km at least, a completely straight tube or a completely curve tube (on a single circle) would lead a too small launch angle. Thus both of them are not feasible. Reasonable tube routes in vertical section will include two or more than two segments, for example, a straight tube segment and a curve tube segment, or two or more than two curve segments in different radius or different curve direction.

Numerical Studies on Modal Analysis of Curved Tube and Coil Tube in Coil-Wound Heat Exchanger

2021 ◽  
Author(s):  
Yue Wang ◽  
Peng Ren ◽  
Guorui Zhu ◽  
Wei Tan
Keyword(s):  
Heat Exchanger ◽  
Large Scale ◽  
Natural Frequencies ◽  
Axial Direction ◽  
Mode Shapes ◽  
Tube Length ◽  
Straight Tube ◽  
Element Analysis ◽  
Maximum Deformation ◽  
Curved Tube

Abstract Coil-wound heat exchanger, which has a large-scale turbulence in the shell side and a great heat transfer coefficient, has been widely used in chemical industry, such as liquefied natural gas (LNG) and crude pyrolysis of ethylbenzene. To investigate the general vibration characteristics, a complete wound tube can be divided into the curved tube and the coil tube for easy research because of its constraint condition. A finite element analysis is used to obtain the natural frequencies and corresponding mode shapes of the curved tubes and the coil tubes with various parameters. For the curved tube, the deformation of middle position of the tube is larger than that of the clamped ends. The maximum deformation occurs at the transition from the bending tube to the straight tube. With the increase of R1 and the decrease of R2, H1, H and θ, the natural frequencies of curved tube increase which is more likely to avoid the fluid-elastic instability, in which R1 is circumferential radius of the straight part of curved tube, R2 is coil radius, H1 is axial straight tube length, H is axial height of curved tube and θ is deflection angle. And for the coil tube, all the deformation for mode shape occurs in the axial direction, and there is no obvious deformation in the radial direction. With the increase of support number and the decrease of R2, the basic frequency of the coil tube increases. It provides a certain reference for the support layout of coil-wound heat exchanger.

Capture Strategy Based on a Distributed Control System for a Large-scale Space End-Effector

ROBOT ◽  
2011 ◽  
Vol 33 (4) ◽  
pp. 434-439 ◽  
Author(s):  
Dangyang JIE ◽  
Fenglei NI ◽  
Yisong TAN ◽  
Hong LIU ◽  
Hegao CAI
Keyword(s):  
Control System ◽  
Distributed Control ◽  
Large Scale ◽  
Scale Space ◽  
Distributed Control System ◽  
End Effector

Progressive Large Scale-Invariant Image Matching in Scale Space

2017 ◽  
Author(s):  
Lei Zhou ◽  
Siyu Zhu ◽  
Tianwei Shen ◽  
Jinglu Wang ◽  
Tian Fang ◽  
...  
Keyword(s):  
Image Matching ◽  
Large Scale ◽  
Scale Space ◽  
Scale Invariant

Scaling Analyses for Large-Scale Space-Based Membrane Optics

AIAA Journal ◽  
2011 ◽  
Vol 49 (7) ◽  
pp. 1313-1323 ◽  
Author(s):  
Michael J. Shepherd ◽  
Richard G. Cobb ◽  
Anthony N. Palazotto ◽  
William P. Baker
Keyword(s):  
Large Scale ◽  
Scale Space ◽  
Scaling Analyses

Piezoelectric polymers actuators for precise shape control of large scale space antennas

2007 ◽  
Author(s):  
Qin Chen ◽  
Don Natale ◽  
Bret Neese ◽  
Kailiang Ren ◽  
Minren Lin ◽  
...  
Keyword(s):  
Shape Control ◽  
Large Scale ◽  
Scale Space ◽  
Piezoelectric Polymers ◽  
Space Antennas ◽  
Precise Shape

Real Time Experimental Performance Assessment of a Photovoltaic Thermal System Cascaded with Flat Plate and Heat Pipe Evacuated Tube Collector

2021 ◽  
pp. 1-28
Author(s):  
Laveet Kumar ◽  
Md Hasanuzzaman ◽  
Nasrudin Abd Rahim
Keyword(s):  
Performance Assessment ◽  
Flat Plate ◽  
Heat Pipe ◽  
Large Scale ◽  
Industrial Process ◽  
Simulation Models ◽  
Solar Thermal ◽  
Evacuated Tube Collector ◽  
Flat Plate Collector ◽  
Evacuated Tube

Abstract In response to the global quest for a sustainable and environmentally friendly source of energy most scientists' discretion is solar energy, especially solar thermal. However, successful deployment of solar thermal technologies such as solar assisted process heating (SAPH) systems in medium- to large-scale industries is still in quandary due to their inefficacy in raising ample temperatures. Cascaded SAPH system, which is essentially a series combination of two same or different types of thermal collectors, may provide a worthwhile solution to this problem. In this article, performance assessment and comparison of two cascaded SAPH systems have been presented: photovoltaic thermal (PVT) cascaded with flat-plate collector (PVT-FPC) and PVT coupled with heat-pipe evacuated tube collector (PVT-HPETC). Simulation models have been presented for individual FPC, HPETC and PVT as well as PVT cascaded with FPC and HPETC systems in TRNSYS and validated through outdoor experimentation. Both the first and the second laws of thermodynamics have been employed to reveal veritable performance of the systems. Results show that PVT-HPETC delivers better performance with 1625 W thermal energy, 81% energy efficiency and 13.22% exergy efficiency. It cuts 1.37 kg of CO2 on an hourly basis. Cascaded systems can be effective in sustaining industrial process heat requirements.

Technological Imaginaries, Feasibilities, Syndromes, and Catastrophes

Dark Skies ◽  
2020 ◽  
pp. 104-142
Author(s):  
Daniel Deudney
Keyword(s):  
Genetic Engineering ◽  
Science Fiction ◽  
Technology Assessment ◽  
Large Scale ◽  
New Technologies ◽  
Scale Space ◽  
Technology Governance ◽  
Existential Risk ◽  
Space Colonization ◽  
Space Activities

Space expansionism, science fiction, and space developments are intimately linked. SF from Verne, Wells, and others inspires space expansionists, and SF is shaped by space discoveries. SF makes space expansionism seem plausible but is often unbound by scientific possibility. An assessment of building block, life-engineering, and transformative technologies reveals that large-scale space activities are becoming more feasible, but creating enclosed ecologies, geo-engineering and terraforming remain doubtful. Anticipating the consequences of new technologies (technology assessment) remains difficult. Technology governance is plagued by recalcitrant syndromes. Theorists of catastrophic and existential risk view space colonization as necessary to escape a long list of possible major calamities (including hostile artificial superintelligence and misused genetic engineering for improved humans, called transhumanism). Human survival increasingly depends on competent futurism and social capacities to steer technology with reversals, regulations, and relinquishments, but these are difficult to establish and maintain. Can vital arrangements of restraint survive large-scale space expansion?

Sign in / Sign up

Export Citation Format

Share Document