Presented by: Aman Shukla
Supervisor: Dr. Wilson Wang
A Selective Teager Huang Transform Technique for Bearing Fault Detection
Rolling element bearings are commonly used in rotary mechanical and electrical equipment. Online health condition monitoring plays a vital role in recognizing the bearing defect at its early stage so as to prevent machinery performance degradation and malfunction. According to investigation, more than half of the rotary machine faults are related to bearing defects. Although many signal processing techniques have been suggested in literature for bearing fault detection, reliable bearing fault diagnosis still remains a challenging task. One of the reasons is that bearing is not a simple component like a gear or a shaft, but a complex system; vibration signals generated from a faulty bearing are usually nonstationary, especially when there is a slippage. However, nonstationary signals are much difficult to analyze using classical signal processing techniques. The objective of this study is to develop an online condition monitoring system for bearing fault detection. In this work, a smart sensor-based data acquisition (DAQ) system is developed for vibration data collection, which consists of a sensing unit, a signal conditioning circuit and a wireless communication module. A selective Teager-Huang transform technique is proposed for bearing fault detection. The processing is undertaken in three steps: Firstly, a denoising filter is used to improve the signal to noise ratio; secondly, a correlation function method is suggested to choose intrinsic mode functions with most representative features related to the fault; and thirdly, a generalized Teager-Kaiser spectrum method is proposed to synthesize the extracted intrinsic mode functions for bearing fault detection. The bearing fault characteristic signatures can be identified from the energy spectrum. The accuracy of the developed smart sensor-based DAQ prototype is examined by comparison tests. The effectiveness of the proposed selective Teager-Huang transform technique is verified by experimental tests corresponding to different bearing conditions. Its robustness in bearing fault detection is examined by the use of the data sets from a different experimental setup.
Presented by: Aman Shukla
RBC is hosting Therapy Dogs from St. John Ambulance in the Agora from 11:00am to 2:00pm on December 6 & 9 2019.
DR. HAIGUANG ZHAO
Qingdao University (China)
Friday, November 29, 2019
Nanomaterials for Sustainable Energy via Green Chemistry
Abstract: Discovering how to efficiently convert solar energy into electrical/chemical energy is one of humanity's greatest challenges in the 21st century in view of the ever-growing global hunger for renewable energy solutions. Current research directives in solar energy conversion are investigating new methods, and, in particular, new materials and processes that will render integrated and more efficient power harvesters from solar energy. The solar to electricity or hydrogen conversion efficiency of many organic, hybrid organic-inorganic, and inorganic devices are still low. And the long-term stability of the devices cannot meet the requirements for commercialization. In this talk, I will focus on the synthesis of nanomaterials via wet chemistry approach and use the materials for fabricating of solar energy conversion devices, including liquid junction solar cells, luminescent solar concentration and solar-driven water splitting for hydrogen production. In the end, I will introduce the fabrication of water splitting devices using biomass, highlighting the use of natural resources for sustainable energy harvesting.
On Tuesday, December 10th, the Alumni Association will be in the Chancellor Paterson Library from 6-7:30 pm offering treats and refreshments to students.
It will also be the last day for the Therapy Dog visits in the Library for the year. We hope the Alumni Association and Therapy Dogs can offer some good cheer and words of encouragement as students study for their exams.
Lakehead Orillia and the Ontario Master Naturalist Program are participating in the Orillia Christmas Bird Count on Saturday, Dec. 14 and you’re invited to join our team, Lakehead Canada Jays!
Come and learn about local bird populations, how to identify birds in the wild, and be a part of citizen science. This is an outdoor event and will happen rain, snow or shine. We will be outside for most of the day so please dress for the weather and walking in snow.
If you would like to join the team, or if you have any questions, please contact Bob Bowles at email@example.com.
Check out the following link for more information about the history of the Christmas Bird Count: https://www.audubon.org/conservation/history-christmas-bird-count.
The Indigenous Law Students’ Association invites all Lakehead students to attend a film screening of "nîpawistamâsowin: We Will Stand Up."
Where: John N. Paterson Auditorium, PACI. 401 Red River Rd, Thunder Bay, ON.
When: Friday, November 29, at 12 pm.
Winner of the Best Canadian Feature Documentary Award at the 2019 Hot Docs Film Festival, "nîpawistamâsowin: We Will Stand Up" is an important look at the past and future. This film demands to be seen by all Canadians.
“On August 9, 2016, a young Cree man named Colten Boushie died from a gunshot to the back of his head after entering Gerald Stanley’s rural property with his friends. The jury’s subsequent acquittal of Stanley captured international attention, raising questions about racism embedded within Canada’s legal system and propelling Colten’s family to national and international stages in their pursuit of justice. Sensitively directed by Tasha Hubbard, nîpawistamâsowin: We Will Stand Up weaves a profound narrative encompassing the filmmaker’s own adoption, the stark history of colonialism on the Prairies, and a vision of a future where Indigenous children can live safely on their homelands.”
The Psychology department invites the University community to attend an upcoming Dissertation defense:
Date: Dec 16th, 2019
Time: 1 pm
Student: Jessica Tanner
Dissertation title: The Effects of a Gambling Information Session on Gambling Knowledge, Beliefs, and Practices for Adult Gamblers
Supervisor: Dr. Dwight Mazmanian
Committee Members: Dr. Michel Bedard, Dr. Alexander Serenko (Internal), Dr. Nigel Turner (External)
February 4th @ 4-5pm in OA 3041
Get help in areas such as: presenting, writing, vocabulary, reading, grammar and speaking.