Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Speed Variation"”.
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Machine tool chatter suppression using spindle speed variation
… be achieved in a boring process (2 DOF) when the speed of the spindle is modulated sinusoidally instead of being kept constant. Since the variation of spindle speed is small and independent of the tool motion, by expanding the delay terms about a finite mean delay and augmenting the system, the …
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Assessment of High-Resolution Simulation in Reproducing Surface Wind over Alps
… is to statistically evaluate the surface wind speed simulated over Alps by the ICON high-resolution climate model. SYNOP observation is the reference of the simulated data. The evaluation is focusing on the perspectives of wind speed and wind directions. The analysis shows the simulation of …
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Dynamics and Stability of Parametrically Excited Gyroscopic Systems
… of this simpler system shows that periodic variations in the delay may lead to larger stability boundaries. These results are applied to demonstrate that greater depths of cut may be achieved in a boring process when the speed of the spindle is modulated sinusoidally instead of being kept …
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Improvement and validation of a thermodynamic S.I. engine simulation code
… crank angle records allowed evaluation of engine speed variation within a cycle and mean engine speed for a cycle. Although generated principally for model validation, the experimental results proved interesting in their own right. Middle, slow and fast cycles were defined for each condition. …
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Handoff management in the mobile wireless Internet
… and should also fully be supportive ofspeed variations in mobile nodes during network layer handoff. In our research we developed and simulated a fast network layer (subnet-to-subnet) handoff management scheme, known as Sector Aware handoff(SAH) strategy. SAH uses cell sectors marked …
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Modelling of screw compressor plant operation under intermittent conditions
… or unsteady inlet conditions, as well as shaft speed variation. Also, following demand, compressor plants often work intermittently with frequent starts and stops. This may cause premature wear, decrease of compressor performance and even failure, which might cost millions of pounds to industry …
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High Speed Acoustophoresis for Multiphase Micron-Sized Particle Assembly
… that assembly time is most sensitive to sound speed, where 1% sound speed variation leads to a 4% change in the assembly time. Examination of the acoustophoresis standing waves show that sound speed and vessel width variation contribute to imperfect constructive interference of the standing …
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Strategies for Removing Non-stationary Effects in Machine Diagnostics using Model-driven and Artificial Intelligence Techniques
… machines experience different levels of speed variations during operation that challenge the practical implementation of these approaches because of problems like smearing of the measured signal spectrum. To address the issues arising due to operating speed fluctuations, this thesis …
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Influence of Fuel Inhomogeneity and Stratification Length Scales on Detonation Wave Propagation in a Rotating Detonation Combustor (RDC)
… that mean detonation velocity decreases and wave speed variation increases with an increase in unmixedness. However, with an increase in stratification length scale mean velocity remain relatively unchanged but variation in local velocity increases. The detonation wave front corrugation also …
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Characterisation of bridge-track interaction of a multi-span viaduct subjected to heavy haul loading
… being hauled. The research also studied the speed variations of each train crossing the bridge. The speeds were analyzed using python and statistical tools in excel. Lastly, the impact of crossing trains on rail forces, rail temperature, ambient temperature, and deck movement was analyzed …
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A Risk Based Approach to Intelligent Transportation Systems Security
… on compliance, route diversion behavior, and speed change behavior, under a compromised DMS. We aim to assess the determinants that are likely to contribute to drivers' compliance with forged information. To this extent, this dissertation evaluates drivers' behavior under different unauthentic …
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Condition Monitoring of VSD-fed Induction Motors
… steady state performance over a large range of speeds [2]. The induction motor is often referred to as the workhorse of the industry due to its predominance in the industry – constituting around 90% of all the motors in the industry [3], [4]. Its admired features include relatively low cost, …