Space elevator construction

Abstract: A space elevator and method of construction of the same that allows a space elevator to be constructed with a single rocket launch by simultaneously sending cables down to earth and away from earth via a construction satellite. When the earthbound cable reaches the surface, additional cable of gradually increasing cross section is fed from the surface of the earth to finish the construction. The finished space elevator uses moving cables to transport simplified elevator cars into space, thereby greatly increasing the throughput of cargo into space compared to prior art and previous designs.

Abstract: A space elevator is a physical connection from the surface of the Earth to a geo-stationary orbit above the Earth approximately 35,786 km in altitude. Its center of mass is at the geo-stationary point such that it has a 24-hour orbit, and stays over the same point above the equator as the Earth rotates on its axis. The structure is utilized as a transportation and utility system for moving payloads, power, and gases between the surface of the Earth and space. It makes the physical connection from Earth to space in the same way a bridge connects two cities across a body of' water. The space elevator may be an important concept for the future development of space in the latter part of the 21th century. It has the potential to provide mass-transportation to space in the same way highways, railroads, power lines, and pipelines provide mass-transportation across the Earth's surface. The low energy requirements for moving payloads up and down the elevator make it one of only a few concepts that has the potential of lowering the cost to orbit to less than $10 per kilogram. This paper will summarize the findings from a 1999 NASA workshop on Space Elevators held at the NASA Marshall Space Flight Center (MSFC). The workshop was sponsored by the Advanced Projects Office in the Flight Projects Directorate at MSFC, and was organized in cooperation with the Advanced Space Transportation Program at MSFC and the Advanced Concepts Office in the Office of Space Flight at NASA Headquarters. New concepts will be examined for space elevator construction and a number of issues will be discussed that has helped to bring the space elevator concept out of the realm of science fiction and into the realm of possibility. In conclusion, it appears that the space elevator concept may well he possible in the latter part of the 21st century if proper planning and technology development is emphasized to resolve key issues in the development of this advanced space infrastructure concept.

Abstract: A system and method for propelling a carriage on a cable of a space elevator. The space elevator system includes a cable anchored to a terrestrial body on a first end and a counterweight on an opposing second end and a carriage riding along the cable. The system also includes an oscillator for generating a mechanical wave upon the cable. Mechanical energy created by the generated mechanical wave is converted into power to propel the carriage upon the cable. The oscillator may include a pair of opposing pistons contacting the cable on opposite sides of the cable or an electromagnetic driver powered by electromagnets located on opposite sides of the cable.