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.
Results
Showing 1 to 12 of 12 for “"rotating machine"”.
-
A study of seismic response of rotating machines subjected to multi-component base excitation
Rotating machines such as motors, generators, turbines, etc. are crucial mechanical components of modern industrial and power generation facilities. For proper functioning of these facilities during and after an earthquake, it is essential that the rotating machines in these facilities also …
-
Fault detection in rotating machines by vibration signal processing techniques
Machines with moving parts give rise to vibrations and consequently noise. The setting up and the status of each machine yield to a peculiar vibration signature. Therefore, a change in the vibration signature, due to a change in the machine state, can be used to detect incipient defects before they …
-
Electric load information system based on non-intrusive power monitoring
… harmonic signal generated by the imbalance of a rotating machine is estimated to monitor the drive, i.e. its speed and magnitude of the imbalance. The algorithms are thoroughly tested using the data collected at real buildings, and some of them are implemented on-line.
-
Model-based nonlinear control of active tilting-pad bearings
… of the pad position during the operation of the rotating machine. In the first part of the dissertation, we develop a nonlinear dynamic model of the active bearing system. The hydrodynamic force produced by the fluid film is modeled as a nonlinear, squeeze-film damper plus repellent spring. A …
-
Methods for non-intrusive sensing and system monitoring
… challenges. At any time in the service life of a machine or system it may perform below its design efficiency. Valves may leak, belts might slip, and equipment may be left on when not needed. Systems under feedback control like HVAC plants will mask the effect of incipient faults from the user by …
-
Testing for relationship between diagnostic tests and DC BDV of in-serviced aged stator bars of a hydro generator
… operation of a high voltage (HV) electrical rotating plant is the integrity of the electrical high voltage insulation of both the rotor and stator. During operation, high voltage generator components (for example stator bars), are continuously and simultaneously subjected to electrical, …
-
Magnetic properties measurement of new magnetic material : SOMALOY 700 (5P)
… of technology. The invention of electrical machines has enabled human to do their chores with easier and more comfortable way. Presently, electromagnetic technology is improving day by day and most of the current electrical machines require the magnetic cores to operate at higher frequency …
-
Slot discharge characteristics of high voltage machines.
… together with discharge pulse propagation and rotating machine insulation diagnostic measurement techniques. In particular, movement of stator coils in the slots of large machines under the influence of naturally occurring electromagnetic forces leads to physical abrasion of the corona screen, …
-
Modal Analysis Techniques in Wide-Area Frequency Monitoring Systems
… an electric power system is composed of coupled rotating machines (large generators) which have air gap magnetic fields that are essentially static, or quasi-static, the power system may be modeled as a system with energy stored in quasi-static magnetic fields. The magnetic fields in the machines …
-
Application of Sweep Frequency Response Analysis and Locked-Rotor Test for Stator Winding Inter-Turn and Broken Rotor Bar Fault Detection of Squirrel-Cage Induction Motors
… used for assessing the operating conditions of a rotating machine. One of the more popular techniques is motor current signature analysis (MCSA) [9]- [10], which analyses the spectral content of the stator current in determining the state of health. A popular technique for assessing the stator …
-
Development of a high power density rotor
High specific power electric machines are crucial to enabling electric and hybrid-electric aircraft. In order to meet this need, a high specific power electric machine with an unconventional topology is being developed. The topology creates mechanical challenges including expansion due to high speed, …
-
Analysis and Design of High-Speed Induction Machines for Submerged Cryogenic Pumps
L'abstract é presente nell'allegato / the abstract is in the attachment