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This paper provides a classification of in-pipe robots or robotic mechanisms in literature with the help of axiomatic design theory (ADT). The existing classification of these designs focuses on either their mobility or contact of the robot with the pipe inner surface. Such classification fails to provide a framework to guide the design of such robots. In this paper, we first propose a new approach...
Tamping machine is one of the pivotal devices for coking plants. Most tamping machines are still driven by rotatory electric motors, through mechanical transmission components, leading to low energy efficiency, slow working frequency and huge maintenance fees. In fact the tamping machine can be directly driven by linear motors as shown in Fig.1. Directly driven system will be simpler with higher working...
This paper studies the volt/var control strategy for smart distribution system by formulating and solving system optimization problems. In the study, solid state transformers (SST) are used for continuous var compensation, while voltage regulators (VR) are for voltage regulation. The objectives are to minimize total system power loss while maintaining voltages along the feeder within acceptable limits...
We demonstrate the fabrication and initial testing of a novel micromachined Thermoelectric Nanowire Characterization Platform (TNCP) which will be applied to measure the thermoelectric properties of a single thermoelectric nanowire. The assembly of the nanowire onto the TNCP is conducted by means of dielectrophoresis (DEP) in combination with a controlled deposition and evaporation of a liquid sample...
This paper described a novel directional underwater thruster which could change thrust directions without any moving parts. When the underwater thruster moved along a non-vertical angle, it could produce straight backward thrust of 2.3mN and lateral thrust of 0.6mN in parallel on the device surface, with the total thrust/weight ration of 2:1. Water jet was streamed out by high intensity acoustic beam...
This paper studies the stability of the central difference method (CDM) for real-time substructure test considering the mass of specimen (i.e., experimental substructure). To obtain correct reaction inertia force, an explicit acceleration formulation is assumed for the CDM. The analytical work shows that the stability of the algorithm decreases with increasing specimen mass if the experimental substructure...
A dust storm consisting of carbon grains accelerated to speeds up to ∼3 km/s has been launched by a plasma jet produced in a coaxial gun. Diamond and graphite powders with grain radii of 0.5 to 30 microns have been used. A distinctive feature of this plasma accelerator is that it can use different types of gases and can operate with microparticles having any shape and a large range of sizes. Deuterium...
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