Mechanical Engineering

Professor

Matsuzaki, Kenichiro

Vibration Suppression for Safe and Comfortable Machinery

Countermeasures against vibration in automatic transmission.

Automotive transmission operates by transmitting the power generated by the engine to the wheels appropriately according to the speed of the car and the road conditions. Manual transmission (MT) and automatic transmission (AT) are the main types of transmission, but most of the cars sold in Japan now have AT. AT automatically controls the reduction ratio, and typically consists of a torque converter and a gear train with planetary gears. The torque converter transmits the power from the engine to the gear train, and the gear train changes the speed. Improvements in ride comfort and fuel economy performance are essential for today's cars, and the structure and speed control of AT has become more complicated. Along with this, the vibration characteristics of AT have become more complicated, and various vibration problems are common. In our laboratory, we study the mechanisms which generate vibrations in AT, and are investigating prevention / reduction measures.

Torque Converter

Countermeasures against vibration caused by vibration histories

Spiral mark generated in a borehole

Cylindrical surfaces that rotate while touching something, such as automobile tires or rollers in steelmaking machines, may deform into polygonal shapes due to uneven wear. Likewise, during machining such as drilling and cutting, the borehole may become polygonal, or chatter marks may be generated on the surface of the workpiece. These vibration phenomena are caused by a history of vibrations building up on the surface of cylinders and workpieces. In our laboratory, we seek to clarify the generating mechanism behind these phenomena and consider preventive measures based on our findings.

Profile

Mechanical Engineering

Professor

Matsuzaki, Kenichiro

Doctor of Engineering, 1995, Kyushu University
2012 Professor, Kagoshima University, Japan
1999 Associate Professor, Kyushu University, Japan
1994 Lecturer, Kyushu University, Japan
"Theoretical and experimental study on rifling mark generating phenomena in BTA deep hole drilling process (Generating mechanism and countermeasure), International Journal of Machine Tools and Manufacture, Elsevier, Vol. 88, January 2015" etc.

Message for Students

In mechanical engineering we will learn a wide range of topics which support manufacturing. Those who are interested in making things and moving things, please check out mechanical engineering. Since you will study various topics in mechanical engineering, I think that you can find a field that interests you. I started researching machine dynamics as a graduate student. Although the field of machine dynamics, which is mainly aimed at suppressing vibration, is rather modest, it is a field that is absolutely necessary for the moving parts of machines. I think that it is attractive to understand the fundamental aspects of manufacturing.

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