Fault Diagnosis of Rotating Machinery using Multi-Sensor Data

, M.Sc. Thesis Sharif University of Technology Hekmat Golmakani, Saeed (Author) ; Arghand, Hesamoddin (Supervisor) ; Behzad, Mehdi (Supervisor)

Abstract

Vibration signals have been used for fault diagnosis frequently. These signals are captured using sensors, which are mounted on different locations of the equipment. Using data captured from different locations of the equipment, will result in roubustness of the fault diagnosis model. But sometimes the predictions of sensors mounted on different locations, happen to conflict. These conflicts among sources of information, make it hard to decide about the overal health state of the equipment. In fact, these conflicts causes a kind of uncertainty called epistemic uncertainty. A powerful mathematical framework for managing epistemic uncertainties, is Dempster-Shafer theory of evidence. An...

Numerical Investigation of the Effect of Dust on the Performance of a H-type Vertical Axis Wind Turbine

, M.Sc. Thesis Sharif University of Technology Golmakani, Atousa (Author) ; Taeibi Rahni, Mohammad (Supervisor) ; Salimi, Mohammad Reza (Supervisor)

Abstract

Nowadays, due to the increase in energy demand and the limitations of using fossil fuels, renewable energy plays an important role in the world's energy supply. Wind turbines generate electrical power using the kinetic energy of the wind. This research investigates the effects of dust and particles on the flow in a vertical axis wind turbine blades. The performance of a H-type vertical axis wind turbine in dusty flow was numerically investigated in two and three dimensions. The effects of two dimensionless numbers (Stokes and particle loading) on the turbine’s aerodynamics and output power were examined. In addition, the erosion rate of turbine blades due to dust particles and turbine...

Numerical Modeling of Surgical Lights Effects on the Operating Room Enviroment

, M.Sc. Thesis Sharif University of Technology Golmakani, Shaya (Author) ; Saeeidi, Mohammad Hassan (Co-Advisor) ; Kazemzadeh Hannani, Siamak (Co-Advisor) ; Sani, Mahdi (Co-Advisor)

Abstract

Cleanrooms have a broad scope of applications from electronics, pharmacy, biotechnology to hospital industries, and are susceptible to fine and ultra-fine particles. In this work operating room in the category of hospital applications is chosen. Airborne particles in the operating room depends on many factors such as room geometry, inlet and outlet design, air displacement rate, obstacles, etc. Surgical light is one of the most critical obstacles in the operating room as it is upstream to the surgery zone. The study presented in this thesis aimed to numerically investigate the influence of radiation emitted from the medical lamps on the indoor airflow quality in operating room environment....