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The Optimized Electrostatic Motor, Christopher Lee Rambin
The Optimized Electrostatic Motor, Christopher Lee Rambin
Doctoral Dissertations
The most common means of electrically activated actuation is the electromagnetic motor. All electromagnetic motors have a low output to weight ratio and low energy efficiency. The motor's weight is due to the coils and magnets used to generate propulsion. The energy loss is mainly the result of Joule heating that is inherent with any current driven device. An electrostatic motor offers the potential of significantly less weight and higher energy efficiency. This lower weight characteristic is due to the epoxide material used to construct the major components of its propulsion unit. Greater efficiency results from the reduced Joule heating …
The Effect Of Pipe Bursting On Nearby Utilities, Pavement, And Structures, Alan Atalah
The Effect Of Pipe Bursting On Nearby Utilities, Pavement, And Structures, Alan Atalah
Doctoral Dissertations
This dissertation has involved field and analytical studies of ground movements, ground vibrations and other design issues associated with trenchless pipe replacement (or pipe bursting, as it is commonly known). The process is used to replace an existing underground service pipe with a completely new pipe but without the disturbance and cost of excavating a trench from the surface. The process typically involves the insertion of a tool into the existing pipe that has a maximum diameter that is slightly larger than the existing pipe. This tool is used to break the existing pipe into pieces and to displace the …