Reliability assessment and risk analysis of rotating machine rotors in various overload and malfunction situations present challenge to engineers and operators. In this paper a new analytical method for evaluation of rotor under large deformation is addressed. Model is presented in general form to include also composite rotors. Presented simulation procedure is based on variational work method ...

Rotor crack detection method by using multi-vibration signals gathered at the basements is presented in this paper. The finite element software ANSYS is applied for analyzing the vibration response characteristics of the basement to determine sensor configuration. Feature fusion for time-domain statistics of multiple sensors is performed by using the support vector machine to diagnose the depth...

We define the analogue of linear equivalence of graph divisors for the rotorrouter model, and use it to prove polynomial time computability of some problems related to rotor-routing. Using the connection between linear equivalence for chip-firing and for rotor-routing, we prove that the number of rotor-router unicycle-orbits equals the order of the Picard group. We also show that the rotor-rout...

A centrifugal method for ultrarapid freezing of cells and subcellular particles has been developed, in which small droplets are centrifuged at high speed through liquid nitrogen. When material such as water or blood was injected from a sYI·inge into a rotor, increased rotor speeds gave progressively smaller frozen droplets. Droplet size of materials introduced from a sprayer was uniform, smalle...

Since the induction motor drives have gained its popularity among regulated drives area, the great effort is put on increasing their efficiency. The use of predictive algorithm to control their speed is becoming a popular approach that preserves high efficiency. This paper presents implementing predictive control on the dSPACE DS1103 system, where the dSPACE is the control part of the system, d...

The rotor-router model, also known as the Propp machine, is a deterministic process analogous to a random walk on a graph [1]. Instead of distributing tokens to randomly chosen neighbors, the rotor-router model deterministically serves the neighbors in a fixed order by associating to each vertex a “rotor-router” pointing to one of its neighbors. The rotor-router model sometimes appears under th...

In a thermally driven rotary motor made from double-walled carbon nanotubes, the rotor (inner tube) can be actuated to rotate within the stator (outer tube) when the environmental temperature is high enough. A sudden stoppage of the rotor can occur when the inner tube has been actuated to rotate at a stable high speed. To find the mechanisms of such sudden stoppages, eight motor models with the...

Title of Thesis: CFD Analysis of a Slatted UH-60 Rotor in Hover Degree Candidate: Yashwanth Ram Ganti Degree and Year: Master of Science, 2012 Thesis directed by: Associate Professor James D. Baeder Department of Aerospace Engineering The effect of leading-edge slats (LE) on the performance of a UH-60A rotor in hover was studied using the OverTURNS CFD solver. The objective of the study was to ...

screw compressors are used to produce the compressed air in the refineries. because of the frequent failures and high prices of these compressors, this research was done to determine the failure causes in one of these compressors. in this study and after about 603 working hours , female rotor compressor had been fractured. metallurgical and other experiments showed that the defect in cooling wa...

This paper presents a physical model of a squirrel cage induction machine with rotor topology. The machine is modeled in Modelica, an object oriented multi physical modeling system. The presented machine model is used to investigate electrical rotor asymmetries in induction machines. For the case of a single broken rotor bar a simulation model is compared with measurement results.