Mq Whiteman Senior Design Poser I Mean Poster[1]

VIBRATION REDUCTION DESIGN for WALK BEHIND TROWEL HANDLE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],J. Chapple ● E. Ketelhut ● R. Garcilazo ● J. Bergh Mechanical Engineering Senior Design 2007 Boise State University Boise, Idaho, USA INTRODUCTION: MQ Whiteman is world renowned for being the industry leader in concrete finishing technology. Their flagship product is the walk behind trowel which they have been producing since the mid 1940’s. Walk behind trowels have seen a relatively small amount of evolution in the original design. PURPOSE : It is a top priority for MQ Whiteman to maintain a high level of safety with their products; our team was presented with the opportunity to find a solution for excessive handlebar vibration. Vibration exposure is known to cause White Knuckle Syndrome, which results in pain in the hands and arms, as well as a decrease in the range of motion, a significant decrease in feeling, and an overall whiteness of the knuckles and hands. The European Union has regulations currently in place (a.k.a CE compliance), with the U.S. soon to follow suit. The standard unit of measure in this industry is Hours of Run Time, which is based on a standard 8 hour workday. Our goal is to meet a rating of 4 Hours. The current handle is rated at 0.7 Hours. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],DISCUSSION: The prototype design proved to be successful. This design would be compliant with CE regulations and significantly better than reported values from other manufacturers. Hours of Run Time was increased from 0.9 on the original handle, to 6 hours (average). This handle is not, however, recommended for production at this time. The handle meets vibration requirements but may not meet the robustness requirement of the construction industry. Secondly, MQ Whiteman is set up primarily as a steel fabrication shop. Aluminum is not used except where absolutely needed. The cost associated with producing this handle at the MQ Whiteman plant prohibits this design. RECOMMENDATION: It is the recommendation of this engineering team that several prototypes (approximately 10) of this design be produced and sent into the field for testing. Customer opinions should gathered and taken into consideration. We have proved that a solution exists, this being the first of many refined versions. Simultaneous research should be done to find a company more equipped to deal with the aluminum fabrication needs. AKNOWLEDGEMENTS & REFERENCES: Bateman, Cody- Design Engineer, MQ Whiteman Cunningham, Gary- R & D Technician, MQ Whiteman Eggert, Rudy- P.E., BSU Faculty; Design Engineering, Prentice Hall 2005 Guarino, Joe- P.E., BSU Faculty, Vibrations Expert Inman, Daniel- Engineering Vibration , 2 nd ed. Prentice Hall 2001 Prairie, Douglas- Engineering Manager, MQ Whiteman Decision Matrix Summary Steel, 3.9 Aluminum, 4.1 Magnesium, 3.2 Carbon Fiber, 2.7 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Material Weighted Rating Result

Mq Whiteman Senior Design Poser I Mean Poster[1]

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