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[文书-求改] phd PS求改

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红尘1015 发表于 2015-11-19 15:42:00 | 显示全部楼层 |阅读模式

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I have always been interested in ManufacturingIndustry, and have come to understand their benefit to society as they havedeveloped. However, during a lecture in September 2014, I learned that 70% ofthe energy which is used in machine tools industry was wasted from David Gross,the recipient of the 2004 Nobel Prize in physics.
After that, I begun to search for somerelevant literature about sustainable manufacturing and discovered that only 15-25%energy is generally used to remove material during processing procedures. I alsodiscovered a correlation between the manufacturing industry and poor airquality. Unsustainable manufacturing using machine tools is one of the mostreasons why the PM2.5 average value in Harbin, the city I live in, is more than300 in winter. Since these discoveries, there has been a strong desire in mymind to contribute to reducing the energy consumption and decreasing thepollution brought by wasted energy. It was for this reason that I began toresearch sustainable manufacturing while earning my Master’s degree and why Idesire to continue my education in this field. I believe that UOIT provides the bestopportunity for me to advance my education in this field and therefore, I havedecided to apply for a doctoral degree. To receive adoctorate degree at this University would be the greatest privilege.
I believe I would be suited for this program becauseof my commitment to hard work. During nearly two years of study in HarbinUniversity of Technology, I showed excellent performance and earned a GPA of 94/100. In addition, I contributed in my field of research of modeling the energyconsumption of machine tools. Specifically I split the cutting power of a millingmachine into two parts: Material Removing Power (MRP) and Loss Power, anddetermined a quadratic relationship. I also validatedthat MRP has an exponential relationship with MRR (Material Removing Rate) throughboth experiment and theoretical derivation. This model provides a reliableprediction of MRP for given cutting parameters with an accuracy of more than82%. The energy efficiency during machining is easier and more precise to getfrom this model.
In addition, I naturally have an interest in research and havea sharp eye to grasp any changes that may lead to new discoveries. In one project, I accidentallyfound that the spindle power is almost the same when the spindle speed is400r/m and 800r/m contrary to the belief that spindle power is a constant orlinear function of spindle speed as stated in some literature on the subject.To explore the relationship of spindle power and spindle speed, I designed anexperiment to record the power of Haas VF2 Machining Center while I changed thespindle speed from 0r/m to 2000r/m  at intervalsof 100r/m. However, I discovered that the power output measured by aCW240 power meter fluctuated heavily. To deal with this problem I programmedthe spindle to remain for 20s at each interval to accurately measure theaverage speed. I finally came to the conclusion that spindle power is a stepfunction of speed by analyzing the experiment data and recognizing that thisfunction is determined by the structure of the main transmission system.
Moreover, the type of machine tools, tool wear, workpiecematerial, and the machining environment should be considered when establishingenergy consumption model for machine tools. I have begun preliminary researchon the influence of cutting tool wear on energy consumption.. Thisis where I would like to focus my efforts and education, however I also knowthat doing so will require more time and experience. I am aware that Professor S. Kara’s grouphas done lots of work in related areas and has published several advancedarticles, which is the most important motivation for me to pursue a PhD degree in UOIT.
I have proven that I am a capable researcher in thisfield through my work in modeling energy consumption and analyzing cutting toolwear’s effect on energy change. I believe that my experience in these areaswill serve as a useful foundation for me as I continue my studies. If I havethe honor to continue education in NUSW, I plan to complete my degree objective in 4 to 5 years. Afterthat, I hope to work as a researcher or teacher at an institute or a universityin Canada.
Thank you for your time and consideration.

重点是各种形容词,和逻辑机构,内容。准备申请加拿大、澳洲的ME的phd。

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